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Severe Weather 4-8 through 4-11-24


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1 hour ago, cheese007 said:

Looking more and more like Monday in TX will be more noteable for severe potential than eclipse visibility

 

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Fortunately, as things stand now, the severe weather potential should hold off until the late afternoon / early evening hours (after the Eclipse time).

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Tuesday night looks to be most interesting for Southern half of TX just ahead of an abnormally deepening, incoming 500Mb Low tracking pretty far south (for the time of year) through the state near Midland, and then into Austin or DFW region Wednesday on both Euro & Canadian. Which would provide lots of support for lift for most of the state to erode any capping issues ahead of it and the cold front (even here in STX down to the lower Rio Grande plains/border) if that much more southerly track indeed happens.

Trough attached south of the Low also looks to be at least neutrally-tilted (instead of positive).

Pretty steep ML lapse rates around 8 C/km in STX and formidable DL shear 50 - 60 kts once again on Euro, along with ample CAPE to the surface on all 3 main globals (70 F+ DPs very likely in place over TX Coastal region ahead of cold front). Will see what CAMs show Monday (when Tuesday night timeframe comes into depiction). But Euro the past couple of days has been consistently showing a pretty sharp linear MCS, rapidly initiating from Laredo - San Antonio/Austin region around midnight.

Damaging winds would likely be primary threat if indeed sharply linear (along with lots of lightning obviously but could be very frequent here in STX).

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D1 ENH with a 10% sigtor and D2 MOD with a 15% sigtor hatch. D3 has two discrete SLGT areas, one strecthing from KY into far western PA and the other from the FL panhandle into NC

 

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D1 hatched mod risk with an ongoing tor watch at 70/50 probs covering Baton Rouge and New Orleans

 

SEL1

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Tornado Watch Number 101
   NWS Storm Prediction Center Norman OK
   600 AM CDT Wed Apr 10 2024

   The NWS Storm Prediction Center has issued a

   * Tornado Watch for portions of 
     Southeast Louisiana
     Central and Southern Mississippi
     Coastal Waters

   * Effective this Wednesday morning and afternoon from 600 AM
     until 100 PM CDT.

   * Primary threats include...
     A few tornadoes likely with a couple intense tornadoes possible
     Widespread damaging winds and isolated significant gusts to 80
       mph likely
     Scattered large hail events to 1.5 inches in diameter possible

   SUMMARY...A destabilizing airmass across the central Gulf Coast will
   support an increasing severe thunderstorm and tornado risk this
   morning into the midday.  The tornado risk will likely maximize with
   any supercells that develop within the warm sector as the marine
   warm front advances northward.  A squall line will move west to east
   across the area with a risk for damaging gusts and the tornado risk
   will likely focus with any sustained mesovortex or embedded
   supercell.

   The tornado watch area is approximately along and 85 statute miles
   east and west of a line from 95 miles northwest of Meridian MS to 45
   miles west southwest of Boothville LA. For a complete depiction of
   the watch see the associated watch outline update (WOUS64 KWNS
   WOU1).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Tornado Watch means conditions are favorable for
   tornadoes and severe thunderstorms in and close to the watch
   area. Persons in these areas should be on the lookout for
   threatening weather conditions and listen for later statements
   and possible warnings.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 99...WW 100...

   AVIATION...Tornadoes and a few severe thunderstorms with hail
   surface and aloft to 1.5 inches. Extreme turbulence and surface wind
   gusts to 70 knots. A few cumulonimbi with maximum tops to 500. Mean
   storm motion vector 25040.

   ...Smith

 

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