SWOMCD
SPC MCD 011935
ILZ000-WIZ000-IAZ000-MNZ000-012100-
MESOSCALE DISCUSSION 0951
NWS STORM PREDICTION CENTER NORMAN OK
0235 PM CDT FRI JUN 01 2007
AREAS AFFECTED...PARTS OF ERN IA...NWRN IL...SRN WI
CONCERNING...TORNADO WATCH 321...
VALID 011935Z - 012100Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 321 CONTINUES.
AREA TO THE NORTH AND EAST WILL CONTINUE TO BE MONITORED FOR THE
POSSIBILITY OF AN ADDITIONAL WATCH.
50 KT SOUTHERLY 500 MB JET STREAK CONTINUES TO GRADUALLY DEVELOP
NORTHWARD ACROSS EXTREME EASTERN IOWA. INITIAL CYCLONIC VORTICITY
CENTER ASSOCIATED WITH THIS FEATURE IS WEAKENING AS IT LIFTS NORTH
OF MASON CITY...BUT NEW CENTER APPEARS TO HAVE FORMED OVER EAST
CENTRAL IOWA. WEAK MESO LOW HAS DEVELOPED NEAR CEDAR RAPIDS...AND
WILL TRACK TOWARD AREAS NORTHWEST OF DUBUQUE THROUGH 21-22Z.
ENHANCED LOW-LEVEL HODOGRAPHS ASSOCIATED WITH EASTERLY SURFACE WINDS
TO THE NORTHEAST OF THIS FEATURE MAY SUPPORT TORNADIC POTENTIAL WITH
NEW STORMS FORMING NORTH OF CEDAR RAPIDS...ACROSS PARTS OF
LINN/BUCHANAN/CLAYTON/DELAWARE COUNTIES.
OTHERWISE...THE PRIMARY SEVERE THREAT WILL LIKELY REMAIN WITH LEAD
CONVECTIVE LINE NOW BEGINNING TO SPREAD EAST OF THE MISSISSIPPI
RIVER INTO NORTHWEST ILLINOIS/SOUTHWEST AND SOUTH CENTRAL WISCONSIN.
THIS SEEMS TO BE FOCUSED IN STRONGEST LOW-LEVEL WARM ADVECTION
REGIME DEVELOPING JUST AHEAD OF UPPER IMPULSE...WHERE LOW-LEVEL
HODOGRAPHS ARE MAXIMIZED AND SUPPORTIVE OF CONTINUING TORNADO
POTENTIAL. SQUALL LINE WITH EMBEDDED SUPERCELLS WILL LIKELY REACH
THE ROCKFORD IL/MADISON WI AREAS BY 22Z.
.KERR.. 06/01/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...ILX...MKX...DVN...ARX...
42479197 42969203 43459149 43649036 43388897 42888874
42258855 41148880 40568991 40909044 41459040 41889049
41999096
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