SWOMCD
SPC MCD 232011
MOZ000-IAZ000-NEZ000-KSZ000-232145-
MESOSCALE DISCUSSION 0868
NWS STORM PREDICTION CENTER NORMAN OK
0311 PM CDT WED MAY 23 2007
AREAS AFFECTED...EXTREME SWRN IA...EXTREME SERN NEB...NERN-SCNTRL KS
CONCERNING...SEVERE THUNDERSTORM WATCH 290...
VALID 232011Z - 232145Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 290
CONTINUES.
PERSISTENT SWLY LLJ...TIED TO THE JETLET ROTATING NWD INTO THE NRN
PLAINS ATTM...CONTINUES TO SUPPORT A BAND OF TSTMS ACROSS WS290 AT
MID-AFTN. 18Z TOP SOUNDING SAMPLED 7.1 DEG C PER KM H7-H5 LAPSE
RATES WHICH SUPPORTS THE SPORADIC LARGE HAIL BEING OBSERVED SO FAR
THIS AFTN. RADAR SUGGESTS THAT COLD POOLS WERE BECOMING STRONGER
AND TSTMS MAY BEGIN TO BECOME FAVORABLY ALIGNED FOR FORWARD
PROPAGATION/BOW ECHOES WITH AN ADDED RISK FOR DAMAGING WIND GUSTS.
FARTHER S...LLJ WAS BEGINNING TO BACK TO MORE SLY OWING TO APPROACH
OF THE LARGER SCALE TROUGH OVER THE SRN ROCKIES. COUPLED WITH THE
MOST UNSTABLE RESERVOIR OF INSTABILITY UPSTREAM...
BACKBUILDING/TRAINING TSTMS HAVE BEEN OCCURRING FROM NEAR/W OF KP28
NEWD TO MIDWAY BETWEEN KSLN-KEWK. THIS REGION HAS EXPERIENCED
SEVERAL HOURS OF VERY HEAVY RAINFALL THIS AFTN AND AT LEAST A FEW
MORE HOURS OF TRAINING TSTMS ARE EXPECTED. AXIS OF HEAVIEST
RAINFALL MAY EVENTUALLY SHIFT NWWD WITH TIME DURING THE EVENING AS
THE UPR TROUGH APPROACHES.
.RACY.. 05/23/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...EAX...OAX...TOP...ICT...DDC...
38839877 39259726 40039637 40809567 40919514 40409504
39819547 38899634 38509697 37499786 37139864 37119928
37839868
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