AREAS AFFECTED...NERN-ERN IA/ERN AND SRN WI/NRN IL
CONCERNING...SEVERE THUNDERSTORM WATCH 333...
VALID 211307Z - 211400Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 333
CONTINUES.
SUMMARY...A NEW WW MAY BE NEEDED TO THE SOUTH OF WW 333 THIS MORNING
AS A BOWING LINE OF STORMS IN SWRN WI TO FAR NERN IA TRACKS
SEWD...REACHING FAR NRN IL AND PART OF EAST CENTRAL IA JUST AFTER
14Z. DAMAGING WIND THREAT MAY EXTEND INTO ERN WI...THOUGH A MORE
STABLE ENVIRONMENT WITH NWD EXTENT COULD LIMIT THIS THREAT IN NERN
WI.
FARTHER W...ISOLATED HAIL REMAINS A THREAT IN PARTS OF NRN IA TO THE
WEST OF WW 333.
DISCUSSION...AT 1245Z...MOSAIC RADAR IMAGERY SHOWED THE NRN EXTENT
OF A BOWING LINE OF TSTMS...NOW APPROACHING ERN WI HAS BEGUN TO
WEAKEN IN INTENSITY...THOUGH REMAINS MOVING EWD AT 40-45 KT. THE
SRN EXTENT OF THIS LINE...NOW MOVING SEWD AT 40-45 KT THROUGH SWRN
WI AND FAR NERN IA...COULD PERSIST A FEW MORE HOURS ACROSS SRN WI
WITH A PORTION OF THE LINE MOVING INTO NRN IL/EAST CENTRAL IA JUST
AFTER 14Z. ALTHOUGH AN INSTABILITY GRADIENT EXTENDED INTO ERN IA
AND NRN IL...THE BOWING LINE WILL MOVE SOUTH OF STRONGER FLOW ALOFT
THAT COULD LIMIT ITS FORWARD SPEED AND OVERALL SEVERE WEATHER THREAT
SOUTH OF WW 333.
MEANWHILE...THE NRN EXTENT OF THE LINE MOVING INTO EAST CENTRAL AND
NERN WI SHOULD BECOME ELEVATED /OR MORE ELEVATED WITH TIME/ GIVEN A
MORE STABLE ENVIRONMENT INTO THESE AREAS PER 12Z GRB SOUNDING.
ADDITIONAL ELEVATED STORMS WILL REMAIN POSSIBLE THIS MORNING ACROSS
FAR NRN IA WITHIN A LOW LEVEL WAA REGIME ALONG AND NORTH OF A SWD
MOVING OUTFLOW BOUNDARY. MODERATE INSTABILITY AND BULK SHEAR OF
35-40 KT REMAIN SUFFICIENT FOR ORGANIZED STRONG TO SEVERE STORMS.
..PETERS/KERR.. 06/21/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GRB...LOT...ILX...MKX...DVN...ARX...DMX...
LAT...LON 43119303 43349118 43868980 44528925 45068922 45108848
44798730 44058748 42718772 41898767 41378767 40918849
41178954 41329035 41849121 43119303
