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April 1st-4th Severe Weather Thread


andyhb

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Much of Texas is capped right now; however, you'll notice that complex riding the Red River. North Texas will have an outflow boundary to work with later today. Cap is forecast to erode later this afternoon. I'm a little surprised SPC TOR probabilities are so low in North Texas. One could use the hatched 30% hail as a proxy for 5-10% tor. North Texas, especially locally at low levels near that OFB, should have good shear. Adequate winds upstairs are noted over North Texas. Agree wiht SPC South Texas lacks wind shear.

 

The main area is Arkansas and Missouri. Agree with Tony about Arkansas. East-west outflow boundary is set up to intersect dry line in Arkansas. The said OFB also gives a chance east of the DL over the flatter Delta of eastern AR.

 

Finally southern Missouri is clearing out, but it is horrible chase terrain. Perhaps it'll be the Show Me Tornado State today. Best of luck to chasers. Everyone stay safe!

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There is no need for a tornado watch?

 

Good catch on this.  

 

Just before 9am I noticed the cumulus clouds were forming columns punching above the surrounding cloud tops.  The clouds gradually thickened and lowered until now we have a very loud thunderstorm, but no severe.  

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12Z GFS also shows more of a secondary low over eastern OK around and after 00Z 04 April. That could further enhance the tornado threat late afternoon and well into evening across central/eastern AR, northwest MS, and southwest TN. Surface temperatures in east of OKC are already a bit higher as of 21Z than forecast by the 06-12Z GFS runs. The warmer temperatures that in the wake of the convection over western AR/eastern OK could further induce a mesolow to form late this afternoon.

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Will be interesting to see if the DFW area gets a surprise this afternoon. FWD mentioned in their update that the dryline slowed down or may stall west of here a county or two. They increased our pops to 40% now instead of the 20% this morning. Very muggy here with on and off sun.

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MESOSCALE DISCUSSION 0261
   NWS STORM PREDICTION CENTER NORMAN OK
   1233 PM CDT THU APR 03 2014

   AREAS AFFECTED...SE KS...SW MO...NE OK...FAR NW AR

   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

   VALID 031733Z - 031900Z

   PROBABILITY OF WATCH ISSUANCE...95 PERCENT

   SUMMARY...SEVERE THREAT IS RAPIDLY INCREASING ACROSS SE KS INTO NE
   OK. STORMS ARE EXPECTED TO DEVELOP IN THE NEXT 1-2 HOURS. ALL SEVERE
   HAZARDS ARE POSSIBLE WITH VERY LARGE HAIL...STRONG/DAMAGING WINDS
   AND TORNADOES POSSIBLE. A WW WILL LIKELY BE ISSUED WITHIN THE NEXT
   HOUR.

   DISCUSSION...VISIBLE SATELLITE IMAGERY SHOWED AGITATED CU FIELD JUST
   AHEAD OF SFC COLD FRONT/DRYLINE ACROSS SE KS SWD INTO NE OK. 17Z
   MESOANALYSIS INDICATED LITTLE IF ANY CAP REMAINED ACROSS THIS
   REGION. THIS MATCHES WELL WITH MODIFIED 17Z RAP FORECAST SOUNDINGS.
   AS THE FRONT ADVANCES TOWARD THE REGION OVER THE NEXT HOUR OR
   TWO...STORMS ARE FORECAST TO QUICKLY DEVELOP AND BECOME SEVERE. DEEP
   LAYER SHEAR WILL FAVOR DISCRETE SUPERCELLS /AT LEAST INITIALLY/. AS
   LOW LEVEL JET INCREASES LATER THIS AFTERNOON AS MIDLEVEL WAVE
   IMPINGES ON THE REGION...STORMS MAY TEND TOWARD UPSCALE GROWTH INTO
   A BROKEN LINE OF SUPERCELLS AND/OR QLCS STRUCTURES. EITHER WAY...LOW
   LEVEL SHEAR AND FORECAST HODOGRAPHS WILL BE SUPPORTIVE OF ROTATING
   LOW LEVEL MESOCYCLONES AND AN ATTENDANT TORNADO THREAT.
   ADDITIONALLY...STEEP MID LEVEL LAPSE RATES AROUND 7.5-8 DEG C PER KM
   AND SBCAPE VALUES APPROACHING 3500 J/KG WILL SUPPORT VERY LARGE HAIL
   DEVELOPMENT.

   PORTION OF TORNADO WATCH 0049 WOULD LIKELY BE REPLACED WITH A NEW
   WATCH TO ENCOMPASS THREAT AS STORMS MOVE EWD INTO SW MO/NW AR.

   ..LEITMAN/HART.. 04/03/2014
 

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Will be interesting to see if the DFW area gets a surprise this afternoon. FWD mentioned in their update that the dryline slowed down or may stall west of here a county or two. They increased our pops to 40% now instead of the 20% this morning. Very muggy here with on and off sun.

 

that system north of the metroplex this morning also was surprisingly strong and there is definately still some potential! dews in the upper 60s!

 

 

3500 CAPE already in se KS under that clearing per SPC meso page.

 

MD concerning that area: http://www.spc.noaa.gov/products/md/md0261.html

 

Looks like se KS will be much more involved than they thought!

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New Tor Watch for Eastern OK/ Western MO

 PRIMARY THREATS INCLUDE...     SEVERAL TORNADOES WITH A FEW INTENSE TORNADOES POSSIBLE     NUMEROUS LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL       EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE     SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY

50/30 for tors/strong tors.

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