MESOSCALE PRECIPITATION DISCUSSION 0067
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
740 AM EDT SUN MAY 26 2013
 
AREAS AFFECTED...NORTHWEST THROUGH EASTERN IA...NORTHWEST IL 
 
CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE 
 
VALID 261139Z - 261430Z
 
SUMMARY...SOME ADDITIONAL REPEATING AND LOCALIZED TRAINING OF
CONVECTION IS EXPECTED NEXT COUPLE OF HOURS...FOSTERING SOME
ADDITIONAL SHORT-TERM FLASH FLOOD CONCERNS.

DISCUSSION...RADAR IMAGERY CONTINUES TO SHOW A NORTHWEST TO
SOUTHEAST ORIENTED LINE OF SHOWERS AND THUNDERSTORMS EXTENDING
ACROSS NORTHERN IA INTO WESTERN IL.  GIVEN SLOW EASTWARD MOTION OF
THE LINE...THE POTENTIAL REMAINS FOR FLASH FLOODING IN THIS AREA
THROUGH AT LEAST 1430Z DUE EITHER TO SLOW MOVING CELLS WHICH
PRODUCE HEAVY RAIN OR CELLS TRACKING OVER AREAS WHICH ALREADY
RECEIVED MODERATE TO HEAVY RAIN.  LOW LEVEL JET WIND SPEEDS STILL
APPEAR TO BE IN THE 30 TO 40 KT RANGE AS IT RIDES NORTH OF A QUASI
STATIONARY FRONT...WHICH WAS ALSO HELPING TO SUSTAIN THE
CONVECTION.  THINKING IS THAT THE RAINFALL RATES WILL BE TAPERING
OFF AS THE LOW LEVEL JET GOES THROUGH DIURNAL WEAKENING BUT SOME
ADDITIONAL RAFL AMOUNTS OF 1 TO 2 INCHES REMAINS POSSIBLE THROUGH
THE EARLY AND MID MORNING. 

BANN


ATTN...WFO...ILX...DVN...ARX...MPX...DMX...FSD...OAX...

LAT...LON   39749004 41359297 42009456 42059553 42419622 43039623
            43519502 43409335 42489156 40998994 40028934 39638944
            39749004