AREAS AFFECTED...NRN ILLINOIS
CONCERNING...SEVERE THUNDERSTORM WATCH 401...
VALID 162310Z - 170045Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 401
CONTINUES.
SUMMARY...AN ADDITIONAL WW MAY BE NEEDED ACROSS THE REMAINDER OF
NORTHERN ILLINOIS WITHIN THE NEXT HOUR OR TWO.
DISCUSSION...THE ORGANIZED STORM CLUSTER NOW CROSSING THE
MISSISSIPPI RIVER... EAST OF MOLINE AND BURLINGTON...WITH A BOW ECHO
CONFIGURATION IN RADAR REFLECTIVITIES...APPEARS TO REMAIN VIGOROUS.
SOME RECENT WEAKENING HAS BEEN OBSERVED...BUT THIS MAY BE TEMPORARY.
LATEST OBJECTIVE INSTABILITY ANALYSES ARE SUGGESTIVE THAT THE
ENVIRONMENT MAY STILL BE MODERATELY UNSTABLE...WITH MIXED LAYER CAPE
AS HIGH AS 2000 J/KG...IN A CORRIDOR ACROSS NORTHERN ILLINOIS.
COUPLED WITH SOME STRENGTHENING OF WESTERLY DEEP LAYER MEAN
FLOW...PERHAPS UP TO AROUND 30 KT...DURING THE NEXT FEW HOURS...THIS
SUPPORTS POTENTIAL FOR RE-INTENSIFICATION AS CONVECTION PROGRESSES
EASTWARD. ACTIVITY MAY BEGIN IMPACTING AT LEAST THE SOUTHERN
PORTION OF THE CHICAGO METROPOLITAN AREA BY AROUND 03Z...WITH THE
POTENTIAL FOR STRONG WIND GUSTS AND SOME HAIL...IN ADDITION TO
FREQUENT CLOUD TO GROUND LIGHTNING AND LOCALLY HEAVY RAINFALL.
..KERR.. 06/16/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...ILX...DVN...
LAT...LON 41659060 41978974 42108887 42098808 41968768 41418753
41048814 40898948 40899054 40839086 41659060
