SUMMARY...AN ISOLATED SEVERE THREAT IS EXPECTED TO DEVELOP ACROSS CNTRL IL INTO WRN IND THIS AFTERNOON. ISOLATED LARGE HAIL AND WIND DAMAGE WILL INITIALLY BE THE MAIN THREAT. AN ISOLATED TORNADO THREAT COULD ALSO DEVELOP LATER THIS AFTERNOON. WW ISSUANCE MAY BECOME NECESSARY ACROSS THE REGION ONCE THE SCENARIO BEGINS TO UNFOLD. DISCUSSION...THUNDERSTORMS ARE CURRENTLY INITIATING AND INCREASING IN INTENSITY JUST TO THE EAST OF A DEEPENING SFC LOW CENTERED OVER NE MO. THE STORMS ARE LOCATED ON THE NERN EDGE OF INSTABILITY AND ON THE NOSE OF A MID-LEVEL JET MOVING INTO THE REGION FROM THE WEST NORTHWEST. THE STRONG MID-LEVEL FLOW ASSOCIATED WITH THE JET IS CREATING FAVORABLE SHEAR PROFILES FOR SEVERE STORMS IN SPITE OF THE WEAK INSTABILITY IN PLACE. THE WSR-88D VWP AT SPRINGFIELD IL CURRENTLY SHOWS ABOUT 65 KT OF 0-6 KM SHEAR WITH SUBSTANTIAL VEERING WITH HEIGHT FROM 2 TO 3 KM. THIS COULD SUPPORT A SUPERCELL THREAT AS LOW-LEVEL MOISTURE ADVECTS NWD INTO THE MCD AREA AND INSTABILITY INCREASES. 500 MB TEMPS OF -15 C TO -19C WILL BE SUPPORTIVE OF ISOLATED LARGE HAIL WITH THE MORE INTENSE CORES. IN ADDITION...LOW-LEVEL LAPSE RATES HAVE STEEPENED SOME ACROSS ECNTRL IL INTO WRN IND AS SHOWN ON MESOSANALYSIS WITH 0-3 KM LAPSE RATES NOW AROUND 7.0 C/KM. THIS ALONG WITH THE STRONG WIND FIELDS AT LOW-LEVELS MAY SUPPORT AN ISOLATED WIND DAMAGE AS CELLS MATURE LATE THIS AFTERNOON. AN ISOLATED TORNADO THREAT COULD ALSO DEVELOP ESPECIALLY IF THE CELLS CAN ROTATE AND PERSIST.
Current Watches, Warnings and Advisories for Peoria Illinois Issued by the National Weather Service
Friday, September 21, 2012
Possibile Watch Later Today
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