749  
ACUS11 KWNS 042157  
SWOMCD  
SPC MCD 042157  
ILZ000-MOZ000-ARZ000-OKZ000-KSZ000-042330-  
 
MESOSCALE DISCUSSION 1780  
NWS STORM PREDICTION CENTER NORMAN OK  
0357 PM CST MON DEC 04 2017  
 
AREAS AFFECTED...MUCH OF SOUTHWEST...CENTRAL AND NORTHEAST  
MO...EXTREME SOUTHEAST KS...AND EXTREME WEST CENTRAL IL  
 
CONCERNING...SEVERE THUNDERSTORM WATCH 518...  
 
VALID 042157Z - 042330Z  
 
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 518  
CONTINUES.  
 
SUMMARY...SEVERE STORMS WILL CONTINUE TO DEVELOP ACROSS SEVERE  
THUNDERSTORM WATCH 518 AS A COLD FRONT ADVANCES EAST THROUGH THIS  
REGION. DAMAGING WINDS REMAIN THE PRIMARY THREAT, THOUGH A BRIEF  
TORNADO CANNOT BE RULED OUT. COUNTIES CAN BE CLEARED FROM THE WEST  
WITH THE COLD FRONT PASSAGE.  
 
DISCUSSION...AT 2140Z, MOSAIC RADAR IMAGERY INDICATED A BROKEN BAND  
OF STRONG TO SEVERE STORMS EXTENDING FROM NORTH-CENTRAL TO SOUTHWEST  
MO, WITH ADDITIONAL STORMS IN EXTREME SOUTHEAST KS. THIS ACTIVITY  
WILL CONTINUE TO ADVANCE THROUGH A NARROW CORRIDOR OF GENERALLY  
MARGINAL INSTABILITY (SURFACE-BASED CAPE LESS THAN 1000 J/KG).  
STRONG EFFECTIVE BULK SHEAR UP TO 50 KT IS SUPPORTING ORGANIZED  
STORMS WITH A FEW SUPERCELLS DETECTED PER AREA WSR-88DS. SGF VWP  
INDICATED VERTICALLY VEERING AND STRENGTHENING LOW-LEVEL WINDS WHICH  
FAVOR A THREAT FOR DAMAGING WINDS, WHILE A TORNADO RISK CANNOT BE  
RULED OUT, THOUGH WEAK BUOYANCY MAY TEMPER THE LATTER THREAT.  
 
..PETERS.. 12/04/2017  
   
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
 
 
ATTN...WFO...ILX...LSX...DVN...LZK...SGF...EAX...TSA...  
 
LAT...LON 36999499 38799398 39899334 40589307 40379200 40149089  
39929058 39439061 38309164 37179219 36539213 36489337  
36569460 36929483 36999499  
 
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