ACUS11 KWNS 100010
SWOMCD
MESOSCALE DISCUSSION 0263
NWS STORM PREDICTION CENTER NORMAN OK
0709 PM CDT THU APR 09 2015
AREAS AFFECTED...NORTH-CENTRAL/NORTHEAST IL AND EXTREME SOUTHEAST WI
CONCERNING...TORNADO WATCH 41...
VALID 100009Z - 100145Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 41 CONTINUES.
SUMMARY...THE POTENTIAL FOR TORNADOES AND SEVERE HAIL/DAMAGING WINDS
CONTINUES ACROSS NORTHERN IL/POSSIBLY FAR SOUTHEAST WI...BUT
PARTICULARLY IN NORTHERN IL AREAS NEAR THE WARM FRONT NEAR
I-88/REAGAN TOLLWAY AND I-39/I-90 CORRIDORS. WITH A DAMAGING TORNADO
ONGOING SOUTH OF ROCKFORD AS OF 7PM CDT...STRONG TORNADOES WILL
REMAIN A POSSIBILITY OVER THE NEXT HOUR OR TWO INTO ADDITIONAL PARTS
OF FAR NORTHEAST IL.
DISCUSSION...SEMI-DISCRETE SUPERCELLS CONTINUE TO DEVELOP/QUICKLY
MATURE ACROSS NORTH-CENTRAL/NORTHEAST IL IMMEDIATELY AHEAD OF AN
INCREASINGLY MORE COMPLEX HP-TO-ASYMMETRIC MCS TRANSITIONAL
STORM-MODE ACROSS NORTHWEST IL AS OF 00Z. NEAR THE WARM FRONT ACROSS
NORTHERN IL...ADEQUATE LOW-LEVEL MOISTURE /LOWER 60S F SURFACE
DEWPOINTS/ EXISTS IN CONJUNCTION WITH RELATIVELY STRONG LOW-LEVEL
SHEAR/SRH...ACCENTUATED BY A MODEST TREND TOWARD LOW-LEVEL BACKING
ACROSS NORTHEAST IL VIA MASS RESPONSE TO THE UPSTREAM DEEPENING
SURFACE LOW. INTENSE SUPERCELLS IN GENERAL VICINITY OF
I-88/I-90/I-39 CORRIDORS INTERACTING/CROSSING THE WARM FRONT ARE
MOST LIKELY TO PRODUCE STRONG TORNADOES IN THE SHORT-TERM.
..GUYER.. 04/10/2015
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...MKX...
LAT...LON 41898934 42378921 42618828 42548792 42008800 41898934
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