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Severe & Flooding Potential: May 3-6, 2015


Quincy

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 MESOSCALE DISCUSSION 0527
   NWS STORM PREDICTION CENTER NORMAN OK
   0808 PM CDT WED MAY 06 2015

   AREAS AFFECTED...WRN AND CENTRAL OK/WRN N TX

   CONCERNING...TORNADO WATCH 133...

   VALID 070108Z - 070215Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 133 CONTINUES.

   SUMMARY...SCATTERED SEVERE/SUPERCELL STORMS CONTINUE ACROSS PARTS OF
   WW 133 -- WHERE ALL-HAZARD SEVERE RISK PERSISTS.

   DISCUSSION...SEVERAL SEVERE/SUPERCELL STORMS ARE ONGOING ATTM FROM
   CENTRAL KS SWD INTO THE TX SOUTH PLAINS...IN AT LEAST THREE CLUSTERS
   -- ONE OVER NRN OK...ONE OVER CENTRAL OK...AND A THIRD OVER SWRN
   OK/WRN N TX.  STORM COVERAGE HAS GRADUALLY INCREASED -- PARTICULARLY
   OVER SRN PORTIONS OF THE WW AS THE LOW-LEVEL JET AND ASSOCIATED
   ASCENT/WARM ADVECTION INCREASE.  

   ATTM...IT APPEARS THAT SEVERE RISK -- MAINLY IN THE FORM OF LARGE
   HAIL AND LOCALLY DAMAGING WINDS -- MAY CONTINUE FOR AT LEAST THE
   NEXT FEW HOURS...GIVEN A BACKGROUND ENVIRONMENT WHICH REMAINS
   SUPPORTIVE FOR SUPERCELLS.  WHILE TENDENCY MAY BE FOR
   CLUSTERING/MESSIER STORM MODE WITH TIME -- AND AN INCREASE IN RISK
   FOR LOCALLY HEAVY RAIN...SEVERE/ISOLATED TORNADO POTENTIAL LIKELY TO
   PERSIST BEYOND 02Z /THE SCHEDULED EXPIRATION FOR WW 133/ SUGGESTS
   THAT A NEW WW FOR AT LEAST PARTS OF THIS AREA WILL BE NEEDED.

   ..GOSS.. 05/07/2015

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This has become one of the more prolific Plains tornado outbreaks in recent years, a lot of areas along the dryline have seen tornadic supercells today, with concentrations in N KS/S NE and the OKC metro.

 

Tornado warning In Archer County, TX now too, and the inflow into the Tuttle cell is amazing.

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Many of these storms seem to be having some outflow issues, each RFD surge undercuts the meso pretty quickly after the tornado touches down.

 

EDIT: talking about the past hour or so in OK/S KS only

Pardon my question, but with such favorable thermodynamics in place, why are the storms near OKC outflow-dominant?

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Pardon my question, but with such favorable thermodynamics in place, why are the storms near OKC outflow-dominant?

 

Because a lot of them are quite high precip. Precip loading of the RFD often allows them to cut off the inflow more efficiently.

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KOKC 070052Z 28031G39KT 1/4SM R35R/3000VP6000FT +TSGSRA FG BKN014 OVC020CB 18/17 A2976 RMK AO2 PK WND 31039/0048 WSHFT 2350 GSB2358E32B52GRB32E52 SLP069 CONS LTGCGICCC OHD-ALQDS TS OHD-ALQDS MOV NE GR 1 P0304 T01830167

 

1" hail and 3.04" of rain in OKC's last ob.

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I'm thinking the main threat in the OKC area as of now is flooding. That cell/cluster could still drop tornadoes like it has, but the ones it has been dropping recently have been weak and very brief, and I don't see that changing for the most part. The Kansas cells have still been fairly impressive to me wrt tornado potential though (*EDIT: and even those have been waining the last few scans).

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