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WhirlingWx

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Posts posted by WhirlingWx

  1. Think it's important to mention the deadly tornado in Bollinger County, MO, because I haven't seen any of that in here. 5 killed by that strong tornado (prelim high-end EF2) after 3 AM. Tragic and yet another example of how "it only takes one" despite the event technically not reaching its ceiling.

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  2. WW0110 Probability

    Tornadoes

    Probability of 2 or more tornadoes

    Mod (60%)

    Probability of 1 or more strong (EF2-EF5) tornadoes

    Mod (40%)

    Wind

    Probability of 10 or more severe wind events

    Mod (50%)

    Probability of 1 or more wind events > 65 knots

    Low (10%)

    Hail

    Probability of 10 or more severe hail events

    High (90%)

    Probability of 1 or more hailstones > 2 inches

    High (70%)

    Combined Severe Hail/Wind

    Probability of 6 or more combined severe hail/wind events

    High (>95%)

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  3. Just now, Powerball said:

    It would be surprising to me if April 2011 was the last moderate risk.

    iirc some day in May 2015 had a moderate risk (might have even been tornado-driven as well).

    Anyways, I think we're approaching the points where obs > models, though I can't help but notice that recent HRRR runs really blow up convection (in the form of supercells) west/northwest of DFW, like in the area that has the severe thunderstorm watch atm. Wind fields don't look very favorable for TORs so maybe the hail threat actually maximizes there? Either way the QLCS can pose problems for us later.

  4. Some pretty serious wording on the most recent SPC outlook

    Day 1 Convective Outlook  
       NWS Storm Prediction Center Norman OK
       1029 AM CST Sun Feb 26 2023
    
       Valid 261630Z - 271200Z
    
       ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS CENTERED ON
       WESTERN...CENTRAL...AND NORTHERN OKLAHOMA...
    
       ...SUMMARY...
       A derecho is forecast with widespread damaging winds and embedded
       swaths of significant severe gusts from 80-110 mph, centered on
       parts of Oklahoma this evening into tonight. Embedded tornadoes are
       anticipated as well, with the greatest potential for strong
       (EF2-EF3) tornadoes across southwest Oklahoma this evening.
    
       ...Southern Great Plains to the Mid-MS Valley...
       Just-in-time moisture return from the western Gulf is still
       anticipated ahead of a powerful shortwave trough ejecting from the
       Southwest to the Lower MO Valley. 60+ F surface dew points remain
       confined from the Piney Woods of east TX to the Concho Valley and
       Edwards Plateau of west TX as of 16Z. Guidance continues to differ
       with the northern extent of this richer moisture by evening in KS/OK
       beneath a stout elevated mixed layer. Widespread cloudiness is also
       evident over much of the southern Great Plains, although clearing
       should occur from west to east across the High Plains. The net
       result should be a narrow plume of surface-based instability along
       the dryline from southwest KS to west TX between 21-00Z. 
    
       Scattered convection will break out after 21Z along the dryline and
       become supercellular towards 00Z given very favorably enlarged low
       to mid-level hodographs. Further moistening into the evening should
       result in the most favorable potential for supercell tornadoes in
       southwest OK between 00-03Z, in addition to very large hail.
       Convection will likely grow quickly upscale into a solid QLCS,
       accelerating east-northeast with embedded supercells and
       mesovortices. Extreme low-level shear profiles in conjunction with
       strengthening of 700-mb winds to around 90 kts behind the line
       should result in widespread severe wind gusts. Embedded swaths of
       80-110 mph winds both straightline and rotating are likely, with
       stronger speeds into the EF2 range possible, until the QLCS outpaces
       the richer moisture in the OK/KS/MO border area overnight. Scattered
       damaging winds from strong to severe gusts may linger through the
       early morning across MO towards the Mid-MS Valley, despite little to
       no buoyancy, given the intense low-level wind fields.
    
       ..Grams/Wendt.. 02/26/2023
    
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