SWOMCD
SPC MCD 141954
WIZ000-IAZ000-MNZ000-142130-
MESOSCALE DISCUSSION 1302
NWS STORM PREDICTION CENTER NORMAN OK
0254 PM CDT WED JUL 14 2010
AREAS AFFECTED...SERN MN INTO W-CNTRL AND SWRN MN AND EXTREME NERN
IA
CONCERNING...TORNADO WATCH 472...473...
VALID 141954Z - 142130Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 472...473...CONTINUES.
THREAT FOR STRONG TORNADOES AND DAMAGING WIND APPEAR TO BE
INCREASING THIS AFTERNOON INTO THE EARLY EVENING FROM SERN MN INTO
W-CNTRL THROUGH SWRN WI AND EXTREME NERN IA. A PDS TORNADO WATCH
WILL LIKELY BE ISSUED SOON FOR PARTS OF SERN MN INTO CNTRL AND SRN
WI.
STORMS HAVE INTENSIFIED IN VICINITY OF AN E-W ORIENTED OUTFLOW
BOUNDARY AND WITHIN ZONE OF PRE-FRONTAL LOW LEVEL CONFLUENCE FROM
W-CNTRL WI SSWWD INTO SERN MN. THE SHEAR-PARAMETER SPACE WITHIN THIS
REGION HAS BECOME VERY FAVORABLE FOR SUPERCELLS CAPABLE OF STRONG
TORNADOES. LATEST OBJECTIVE ANALYSIS SHOWS 0-1 KM STORM RELATIVE
HELICITY FROM 300-400 M2/S2 ALONG WITH 2000-3000 J/KG. SUPERCELLS
WITH STRONG TORNADOES AND BOWING SEGMENTS WITH DAMAGING WIND WILL BE
POSSIBLE AS STORMS CONTINUE TO DEVELOP THIS AFTERNOON AND EVENING.
..DIAL.. 07/14/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GRB...MKX...ARX...MPX...
LAT...LON 45089187 44639036 43988967 43329048 43379207 44189262
45089187
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