CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 150254Z - 150430Z
CONVECTIVE TRENDS ARE BEING MONITORED FOR THE POSSIBILITY OF AN
ADDITIONAL WW EAST OF WW 172 WITHIN THE NEXT HOUR OR TWO.
THE ENVIRONMENT ALONG/NORTH OF A DEVELOPING WARM FRONT ACROSS
NORTHERN ILLINOIS DOES NOT APPEAR MUCH MORE THAN WEAKLY UNSTABLE.
HOWEVER...A SIGNIFICANT AND PERSISTENT SURFACE PRESSURE PERTURBATION
REMAINS EVIDENT WITH THE ORGANIZED MESOSCALE CONVECTIVE SYSTEM NOW
IN THE PROCESS OF DEVELOPING EASTWARD ACROSS EASTERN IOWA INTO
NORTHERN ILLINOIS AND EXTREME SOUTHERN WISCONSIN. ACTIVITY IS BEING
SUPPORTED BY AN AREA OF ENHANCED LOWER/MID TROPOSPHERIC WARM
ADVECTION AND DIVERGENT UPPER FLOW DOWNSTREAM OF THE SIGNIFICANT
UPPER TROUGH CROSSING THE ROCKIES. AND IT APPEAR THAT CONVECTION
MAY MAINTAIN STRENGTH WITH THE RISK FOR POTENTIALLY DAMAGING WIND
GUSTS...PERHAPS A CONTINUING RISK FOR HAIL...INTO THE
CHICAGO...POSSIBLY MILWAUKEE...METROPOLITAN AREAS BY THE 06-08Z TIME
FRAME.
..KERR.. 04/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...ILX...MKX...DVN...
LAT...LON 42199117 42589015 42768913 42798804 42538779 41788770
41418816 41208899 41239018 41229086 41179144 42199117
