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  • DAY48SVR: Nws Storm Prediction Center Norman Ok

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, July 02, 2025 08:59:23
    ACUS48 KWNS 020859
    SWOD48
    SPC AC 020857

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0357 AM CDT Wed Jul 02 2025

    Valid 051200Z - 101200Z

    ...DISCUSSION...
    Some severe weather is possible on Day 5/Sunday and Day6/Monday
    across portions of northern Montana and North Dakota as moderate
    instability builds into the area with moderate mid-level flow
    southeast of a trough across western Canada. The evolution and
    timing of this trough remains uncertain and therefore, no severe
    weather probabilities will be added at this time.

    Beyond this timeframe, moderate to strong instability is forecast
    across much of the central and eastern CONUS for much of the
    extended forecast period with widespread thunderstorm activity
    likely. Despite this storm coverage and instability, organized
    severe weather seems unlikely given mostly weak deep-layer
    shear/flow.

    ..Bentley.. 07/02/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, July 03, 2025 08:59:59
    ACUS48 KWNS 030859
    SWOD48
    SPC AC 030858

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0358 AM CDT Thu Jul 03 2025

    Valid 061200Z - 111200Z

    ...DISCUSSION...
    During the extended forecast period, a mid-level ridge will build
    across the InterMountain West. Aside from the primary ridge, there
    will be several mid-level shortwave troughs throughout the flow
    across the Northwest and also from the Great Lakes to the Atlantic
    coast. Widespread thunderstorm activity is expected throughout the
    period, but stronger mid-level flow/shear should mostly stay north
    of the stronger instability early in the period.

    At some point next week (mid week according to the GFS and late next
    week into the weekend ECMWF) mid-level northwesterly flow will
    likely strengthen across the Plains (to the east of the primary
    ridge). Whenever this occurs, the pattern would favor severe MCSs
    given the forecast strong instability and moderate deep-layer shear.
    However, the uncertainty in the upper-level pattern remains too
    great to provide an accurate forecast of the timing and location of
    the greatest severe weather threat toward the middle to late part of
    next week.

    ..Bentley.. 07/03/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, July 04, 2025 08:43:04
    ACUS48 KWNS 040842
    SWOD48
    SPC AC 040841

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0341 AM CDT Fri Jul 04 2025

    Valid 071200Z - 121200Z

    ...DISCUSSION...
    An upper ridge will gradually build over the Southwest while mainly
    zonal mid-level flow persists over the northern CONUS through next
    week. A relatively nebulous surface pattern will be the norm through
    the extended range. Rich low-level moisture will overspread the
    CONUS east of the Rockies Days 4-8/next Monday-Friday, supporting
    scattered thunderstorm development over much of the Great Plains
    into the MS Valley, and the Southeast into the Northeast. The best
    chance for at least isolated strong to potentially severe storms in
    the upcoming week would be across the north-central CONUS. Here, the
    low-level moisture will advect northward beneath relatively cooler
    temperatures and modest northwesterly flow/shear aloft. However,
    given the nebulous and weakly forced environment, confidence is too
    low to delineate severe probabilities over the north-central U.S.
    for any given day.

    ..Squitieri.. 07/04/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, July 05, 2025 08:48:08
    ACUS48 KWNS 050848
    SWOD48
    SPC AC 050846

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0346 AM CDT Sat Jul 05 2025

    Valid 081200Z - 131200Z

    ...DISCUSSION...
    An upper ridge will build across the Southwest and remain in place
    this upcoming week into next weekend. Relatively zonal mid-level
    flow will persist over the northern CONUS through the extended
    forecast period, with multiple embedded impulses expected to track
    eastward within the zonal flow. As the mid-level impulses traverse
    the northern Plains, isolated strong to severe storm development
    will be possible given the presence of ample buoyancy. However,
    there are appreciable differences in the placement and timing of
    these impulses among medium-range guidance members. Therefore,
    severe probabilities have been withheld since confidence is
    currently low regarding where and when organized clusters of severe
    storms will develop.

    ..Squitieri.. 07/05/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, July 06, 2025 08:30:44
    ACUS48 KWNS 060830
    SWOD48
    SPC AC 060829

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0329 AM CDT Sun Jul 06 2025

    Valid 091200Z - 141200Z

    ...DISCUSSION...
    An upper ridge will remain in place across the Southwest while zonal
    mid-level flow continues to support embedded impulses traversing the
    northern CONUS this week into next weekend. The first notable
    mid-level impulse, which will bring severe potential to the central
    U.S. in the Days 2-3 time-frame, will approach the East Coast while
    slowing its forward advance. The impulse should reach the East Coast
    by Day 4 (Wednesday), providing adequate lift for at least scattered thunderstorms through the remainder of the week. Given preceding
    rich low-level moisture, ample buoyancy will be available to support
    at least isolated strong storms with potentially damaging gusts.

    A more pronounced mid-level trough will approach the Northern Plains
    in the Days 4-5 (Wednesday-Thursday) period, resulting in strong
    surface troughing and the northward advection of rich low-level
    moisture. Medium range guidance consensus shows that strong
    instability will precede the upper/surface troughs, favoring the
    development of severe storms. The first chance for severe storms
    will be over the western Dakotas on Wednesday as the upper trough
    approaches from the Northern Rockies. Upper support in this region
    does not currently appear robust, so severe storms may occur on a
    more isolated basis (hence no severe probabilities introduced at
    this time). However, there is medium range guidance agreement in the
    upper trough ejecting into the northern Plains on Day 5 (Thursday),
    with some guidance suggesting that instability could become extreme.
    Though it is difficult to confidently pinpoint storm mode this far
    in advance, guidance hints at the development of a persistent,
    elongated convective system, which may be capable of supporting all
    severe hazards, especially severe winds. Severe probabilities have
    been added to address this scenario.

    As the pronounced mid-level trough progresses eastward, more
    organized severe storms are possible over the MS Valley and perhaps
    points east Day 6 onward. However, the intensity, coverage, and
    location of severe potential will be highly dependent on the
    evolution of convection from previous days, which is hard to know
    this far in advance. Therefore, severe probabilities have been
    withheld this outlook.

    ..Squitieri.. 07/06/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Monday, July 07, 2025 08:45:34
    ACUS48 KWNS 070844
    SWOD48
    SPC AC 070842

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0342 AM CDT Mon Jul 07 2025

    Valid 101200Z - 151200Z

    ...DISCUSSION...
    The Southwest upper ridge will gradually flatten as a more
    progressive mid-level flow regime becomes established over the
    northern CONUS later this week into early next week. Multiple
    pronounced mid-level troughs, with cooler temperatures aloft, will
    traverse the north-central U.S. and overspread rich low-level
    moisture. Strong buoyancy will precede these troughs, and upon
    lifting of this unstable airmass, at least scattered organized
    thunderstorm development should ensue, with multiple rounds of
    strong to severe storms possible.

    ...Day 4 (Thursday) - Northern Plains...
    The first in a series of mid-level troughs will eject into the
    northern Plains on Day 4/Thursday, encouraging surface lee troughing
    across the central and northern Plains. Dewpoints into the 70s F,
    beneath 8+ C/km mid-level lapse rates, will support strong to
    locally extreme instability by afternoon peak heating. The ejection
    of the upper trough will provide enough upper support for scattered thunderstorm development. Increasing westerly flow with height will
    result in straight, elongated hodographs. Supercells should be the
    main mode of convection, at least initially, with severe wind and
    hail the primary threats.

    ...Days 5-6 (Friday-Saturday) - Midwest toward the Great Lakes...
    The main mid-level trough will continue to slowly approach the Upper
    MS Valley as a preceding mid-level impulse continues to advance
    eastward. Potential exists for renewed thunderstorm development for
    portions of the Upper MS Valley and Midwest on Friday, spreading
    east with upper trough advancement toward the Great Lakes on
    Saturday. Rich low-level moisture beneath steep mid-level lapse
    rates will promote strong instability in the warm sector, amid
    modest vertical wind shear. Somewhere in this region, strong to
    severe storms are likely, with severe wind/hail the main concerns on
    both Friday and Saturday. The timing and location of thunderstorm
    initiation will be highly dependent on the position of remnant
    outflow boundaries from storms during previous days. Such details
    are quite challenging to point out this far in advance, precluding
    severe probabilities at this time, though probabilities will likely
    be needed in future outlooks.

    ...Days 7-8 (Sunday-Monday) - Upper Mississippi Valley...
    The next in a series of mid-level troughs will traverse the
    north-central CONUS toward the end of the period. Medium-range
    guidance consensus depicts extreme instability (i.e. well over 4000
    J/kg MLCAPE) preceding this trough, along with strong enough
    westerly mid-level flow and accompanying vertical wind shear. As
    such, another episode of organized severe storms is possible in the Sunday/Monday time-frame. However, given the seasonal weak forcing
    associated with this second low-amplitude trough, run-to-run
    guidance consistency is desired before severe probabilities are
    delineated.

    ..Squitieri.. 07/07/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tuesday, July 08, 2025 08:19:02
    ACUS48 KWNS 080818
    SWOD48
    SPC AC 080817

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0317 AM CDT Tue Jul 08 2025

    Valid 111200Z - 161200Z

    ...DISCUSSION...
    The overall current large-scale pattern will persist through this
    forecast period, albeit with minor day-to-day variations. More
    specifically, a mid-level ridge will persist across the western US,
    although its center will meander from the Southwest US to off the
    coast of California and back; a series of shortwave troughs of
    varying intensity will quickly move across the northern Plains; and
    a very warm, moist environment will remain entrenched across the
    eastern US.

    This overall pattern suggests episodic bouts of severe thunderstorms
    on any given day. However, the timing and location of specific
    episodes will be tied to mesoscale details and impacts from prior
    days' convection which have low predictability on time scales of
    this forecast period. As such, low confidence in the details of
    required to identify any of these severe events currently precludes
    any probabilistic delineation at this time.

    That said, there are a couple of scenarios being monitored for
    potential future highlights. The first is the potential for severe
    storms across the southern Plains on Saturday or Sunday associated
    with a residual boundary/front. However, impacts from a potential
    overnight mesoscale convective system moving from the High Plains
    into the Southern Plains on Friday night into Saturday lead to
    little confidence in the placement of any boundaries and the
    resulting severe potential.

    Another potential is for severe convection across northern Minnesota
    and the Upper Great Lakes early next week associated with a stronger
    shortwave trough moving through southern Canada. However, guidance
    continues to show high variance regarding the strength of moisture
    return, degree of instability, and timing of the shortwave itself to
    preclude unconditional severe probabilities at this time.

    ..Marsh.. 07/08/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, July 09, 2025 08:22:14
    ACUS48 KWNS 090820
    SWOD48
    SPC AC 090818

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0318 AM CDT Wed Jul 09 2025

    Valid 121200Z - 171200Z

    ...DISCUSSION...
    The overall large-scale pattern looks to remain characterized by mid-to-upper-level ridging across the western United States with a
    zonal to broadly cyclonic flow across the northern tier of the US
    through the forecast period. At the same time, rich/moist low-level
    moisture looks to remain entrenched across much of the eastern US,
    sustained in part by broad, southerly flow, albeit with some
    fluctuations in raw values. Global models continue to be bullish on
    a seasonably strong cold front pushing south through much of the
    central US late in the forecast period, ushering in a cooler/drier
    airmass.

    Strong-to-locally severe thunderstorms will be possible somewhere
    across the eastern CONUS every day of the forecast period. However,
    with synoptic-scale forcing/dynamics primarily constrained to
    Canada, most thunderstorms will be determined by
    sub-synoptic/mesoscale details dictated by/reinforced with each
    prior day's convection. Thus, confidence is too low in any one
    location on any given day to introduce unconditional severe
    probabilities at this time.

    However, some areas/scenarios of interest to monitor include the
    southern Great Plains on Days 4-5/Saturday-Sunday as a moist, weakly
    capped environment will exist in proximity to an increasing diffuse
    surface boundary. Other areas include the East Coast most afternoons
    and the along and ahead of seasonably strong cold front pushing
    south through the Great Plains from Days 6-8.

    For each of the areas of interest/scenarios of interest above, weak effective-layer shear stemming from generally weak tropospheric flow
    will be a limiting factor for a more organized severe potential and
    confidence to introduce unconditional probabilities.

    ..Marsh.. 07/09/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, July 10, 2025 08:18:13
    ACUS48 KWNS 100818
    SWOD48
    SPC AC 100816

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0316 AM CDT Thu Jul 10 2025

    Valid 131200Z - 181200Z

    ...DISCUSSION...
    At the start of the forecast period, the mid-level pattern will
    generally be zonal across much country, with the greatest height
    gradient found across the northern United States. By the middle of
    next week, a short-wave trough moving within the broader flow regime
    will amplify the height field across the northern Rockies before
    moving into the central US. The overall pattern recognition would
    suggest the potential for at least isolated severe thunderstorms
    ahead of this feature across then northern Plains into the Upper
    Great Lakes. However, model run-to-run timing differences along with inter-model timing differences precludes the ability to identify 15% unconditional probabilities on any given day.

    Associated with the aforementioned mid-level trough, a surface-cold
    front will push south through much of the Plains and into the East.
    Additional thunderstorms will be likely along the front, however,
    the location of the front on any given day will be strongly
    influenced by previous days' convection. As such, when coupled with
    the uncertainty in the timing of any mid-level wave, predictability
    is too low to identify unconditional probabilities at this time.

    ..Marsh.. 07/10/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, July 11, 2025 08:41:50
    ACUS48 KWNS 110841
    SWOD48
    SPC AC 110840

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0340 AM CDT Fri Jul 11 2025

    Valid 141200Z - 191200Z

    ...DISCUSSION...
    A surface cold front across the southern Great Plains early in the
    period will quickly redevelop northward into the northern Plains in
    response to strong lee cyclogenesis across the northern High Plains.
    This cyclogenesis will occur in response to a positive-tilt
    short-wave trough moving through the broadly zonal mid-level flow
    across the northern US.

    This front will move back south during the period as a seasonably
    strong high pressure builds southward into the central US in the
    wake of the aforementioned short-wave trough. Thunderstorms are
    likely to develop in the vicinity of the front/aggregate outflow
    boundary each afternoon as it moves south. However, given the lack
    of significant flow amplification as the mid-level wave crosses the
    northern US, it is likely that thunderstorms will remain displaced
    south of the requisite effective-layer shear needed to promote an
    organized severe threat identifiable at this time range.

    One exception to the idea that storms will be displaced from the
    better shear may take place on Monday/Day-4 across portions of North
    Dakota. Here, low-level moisture will surge northward in response to
    the aforementioned northern High Plains lee cyclogenesis. Steep
    mid-level lapse rates will overspread the northern Great Plains
    during the day, yielding most-unstable CAPE values ranging from 1000
    J/kg to perhaps 3000 J/kg depending on model guidance.

    However, run-to-run inconsistency in the space and time evolution of
    relevant features leads to little confidence in identifying where
    any overlap of thunderstorms, instability, and effective-layer shear
    might support severe thunderstorms. However, if model guidance
    begins to converge on potential scenarios, probabilistic delineation
    may become warranted in subsequent forecasts.

    ..Marsh.. 07/11/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, July 12, 2025 07:32:22
    ACUS48 KWNS 120731
    SWOD48
    SPC AC 120730

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0230 AM CDT Sat Jul 12 2025

    Valid 151200Z - 201200Z

    ...DISCUSSION...
    Several shortwave impulses are forecast to move through
    low-amplitude upper troughing over the northern tier of the U.S.
    during the Day 4-8 period. At the surface, a cold front is expected
    to develop south/southeast across portions of the northern/central
    Plains and Upper Midwest on Days 4-5/Tue-Wed. Given a moist and
    unstable airmass ahead of this feature, some severe potential is
    possible from the central Plains to the Upper Midwest. However,
    medium range guidance shows large spread in the location and timing
    of the front and any associated convection, resulting in low
    predictability.

    Later in the period, strong upper ridging will develop over the
    Southeast. Some severe potential could continue eastward across the
    Great Lakes to the Mid-Atlantic around Days 5-6/Wed-Thu as the
    aforementioned cold front stalls in response to the building
    Southeast ridge. However, large-scale ascent and deep-layer flow
    will remain modest, and any severe potential would likely be driven
    by mesoscale processes not well resolved at this time scale.

    ..Leitman.. 07/12/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, July 13, 2025 07:34:52
    ACUS48 KWNS 130734
    SWOD48
    SPC AC 130732

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0232 AM CDT Sun Jul 13 2025

    Valid 161200Z - 211200Z

    ...DISCUSSION...
    Generally low-amplitude westerly flow will persist across the
    northern tier of the CONUS during the Day 4-8 period. A couple of
    shortwave impulses will migrate through westerly flow from the Upper
    Midwest to the Great Lakes vicinity on Days 4-5/Wed-Thu and again
    during the weekend. These features could support some severe
    thunderstorm potential for parts of the Midwest/Great Lakes
    vicinity, particularly on Days 4-5/Wed-Thu as a sagging cold front
    stalls over the Great Lakes. However, prior convection and large
    spread among various medium range guidance regarding timing and
    location of these somewhat subtle features precludes severe
    probabilities at this time.

    Strong upper ridging will develop across the south-central and
    southeast U.S. beginning around Day 6/Fri. Weak deep-layer flow
    beneath the upper ridge and lack of large-scale forcing will limit
    severe potential from the southern Plains into the Southeast.

    ..Leitman.. 07/13/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Monday, July 14, 2025 08:30:45
    ACUS48 KWNS 140830
    SWOD48
    SPC AC 140829

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0329 AM CDT Mon Jul 14 2025

    Valid 171200Z - 221200Z

    ...DISCUSSION...
    Upper ridging will build across the south-central and southeastern
    U.S. during the Day 4-8 period. This will confine a series of
    low-amplitude upper troughs to the northern tier of the U.S. along
    the international border. Bouts of strong to severe thunderstorm
    potential will be possible through the period as individual
    shortwaves provide modestly enhanced mid/upper westerly flow from
    the northern Plains to the Great Lakes vicinity. Given the generally low-amplitude nature the upper pattern across the northern U.S.
    through at least Day 6 or 7/Sat or Sun, the main driver of severe
    potential each day will be mesoscale features tied to prior days
    convective evolution, not well resolved at longer time scales. As a
    result, predictability is low.

    ..Leitman.. 07/14/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tuesday, July 15, 2025 06:53:56
    ACUS48 KWNS 150653
    SWOD48
    SPC AC 150652

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0152 AM CDT Tue Jul 15 2025

    Valid 181200Z - 231200Z

    ...DISCUSSION...
    Low-amplitude/zonal westerly mid/upper flow is forecast across the
    northern U.S. for much of the Day 4-8 period. At the same time, the
    subtropical upper ridge/high over the Southeast will spread
    westward, with larger-scale upper ridging developing over the
    central U.S. late in the forecast period. Seasonally moist and
    unstable conditions will exist for much of the CONUS east of the
    Rockies. This will lead to daily thunderstorm activity, particularly
    for parts of the northern/central Plains to the Midwest and
    Mid-Atlantic regions. These areas will generally be on the north
    side of the subtropic high and the southern fringes of any stronger
    westerly flow near the international border. However, a lack of any
    stronger forcing for ascent or notable surface features precludes
    severe probabilities.

    ..Leitman.. 07/15/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, July 16, 2025 07:47:36
    ACUS48 KWNS 160747
    SWOD48
    SPC AC 160745

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0245 AM CDT Wed Jul 16 2025

    Valid 191200Z - 241200Z

    ...DISCUSSION...
    A low-amplitude upper trough will move from the Great Lakes through
    the Northeast during the Day 4-5/Sat-Sun period. Some enhanced
    westerly flow aloft and a deepening surface low will accompany this
    system. While forecast guidance varies with timing and location of
    these features, some severe potential could develop from portions of
    the Great Lakes to the Northeast/Mid-Atlantic over the weekend ahead
    of a cold front. Details are still uncertain regarding where a
    better chance for severe storms may develop, precluding
    probabilities.

    By early next week, upper ridging is forecast for much of the CONUS
    east of the Rockies while an upper shortwave trough persists over
    the Northwest. Late in the period, a shortwave impulse may eject
    from the Northwest upper shortwave and move across the northern
    Plains, posing some increasing risk for severe potential, though
    confidence in this scenario remains too low to include an outlook
    area at this time.

    ..Leitman.. 07/16/2025

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