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March 14-15 Severe Weather Outbreak


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47 minutes ago, Powerball said:

Screenshot_20250314_152327.thumb.jpg.d0ad0c762a3f416b41f07f938a6d238e.jpg

URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 31
   NWS Storm Prediction Center Norman OK
   320 PM CDT Fri Mar 14 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Western and Central Iowa
     Eastern Nebraska

   * Effective this Friday afternoon and evening from 320 PM until
     1000 PM CDT.

   * Primary threats include...
     Widespread damaging winds and isolated significant gusts to 90
       mph likely
     Scattered large hail events to 1.5 inches in diameter possible
     A tornado or two possible

   SUMMARY...Thunderstorms will spread rapidly north-northeastward this
   afternoon and evening, while posing a threat for widespread
   severe/damaging winds. The strongest wind gusts could reach 80-90
   mph on an isolated basis. Some hail and perhaps a tornado could also
   occur if a supercell can form and be sustained later this evening.

   The severe thunderstorm watch area is approximately along and 65
   statute miles north and south of a line from 25 miles west northwest
   of Lincoln NE to 50 miles north of Ottumwa IA. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU1).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Severe Thunderstorm Watch means conditions are
   favorable for 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. Severe thunderstorms can and occasionally do produce
   tornadoes.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 30...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   1.5 inches. Extreme turbulence and surface wind gusts to 80 knots. A
   few cumulonimbi with maximum tops to 500. Mean storm motion vector
   19055.
 
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ww0032_overview_big_wou.gif

 

 
 
URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 32 NWS Storm Prediction Center Norman OK 400 PM CDT Fri Mar 14 2025 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northern Arkansas Western Illinois Central and Eastern Missouri * Effective this Friday afternoon and evening from 400 PM until 1100 PM CDT. * Primary threats include... Several tornadoes and a couple intense tornadoes likely Widespread damaging winds and isolated significant gusts to 90 mph likely Scattered large hail and isolated very large hail events to 2.5 inches in diameter likely SUMMARY...Intense thunderstorms will move very quickly east-northeastward this afternoon and evening. Widespread severe/damaging winds are the main threat this afternoon, with gusts potentially reaching up to 80-90 mph. The tornado and large hail threat is expected to increase later this evening, with sustained supercells potentially posing a threat for multiple strong tornadoes as moisture returns northward across Arkansas into Missouri and Illinois. The tornado watch area is approximately along and 70 statute miles east and west of a line from 35 miles west northwest of Quincy IL to 15 miles east southeast of Russellville AR. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2).
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6 minutes ago, Sydney Claridge said:

I feel like there are questions on moisture return at the moment as to why SPC didn’t go PDS.

Atmosphere is still somewhat worked over from the morning / early afternoon convection. Also, low level flow, while sufficient, isn't the most ideal for a PDS tornado setup.

That said, to your point about moisture, that should improve as the afternoon/evening progresses (which should also correspond with an increase in storm coverage / intensity).

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38 minutes ago, Powerball said:

Atmosphere is still somewhat worked over from the morning / early afternoon convection. Also, low level flow, while sufficient, isn't the most ideal for a PDS tornado setup.

That said, to your point about moisture, that should improve as the afternoon/evening progresses (which should also correspond with an increase in storm coverage / intensity).

Those storms were elevated and did not appreciably change the environment very much.

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1 minute ago, HillsdaleMIWeather said:

Things seem to be progressing according to modeling so far, the nighttime timing of the tornadoes tonight is gonna make search and rescue if necessary a pain 

Dare I say the models did a fantastic job with this? Pretty consistent a week out. 

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It's a shame dew points mixed out so bad. Hrrr modeled that well. Moisture so shallow and we mixed pretty deep today. Went from 55 dew earlier to 44. Showing recovery possible last second. Feel like best tornado threat will be I72 south and likely I70 south. Hoping line organizes more so I can at least get damaging winds. 

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44 minutes ago, Chinook said:

Latest HRRR has a huge updraft helicity track by St. Louis

It follows that same current tornado warned storm as well. Btw on a local side note, you feel that 11° temperature jump here? KDUH was showing the lake breeze over Toledo was overpowered, went from 63 to 74 in 20 minutes

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For a week all models have shown a strong line moving through eastern Iowa this evening.  So far, the line approaching my area is weak crap.  The 40s dews are not helping.

counter-point: that weak looking stuff is still producing severe level winds/damaging, due to the environment it’s in.
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