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Mesoscale Discussion 906 |
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MESOSCALE DISCUSSION 0906
NWS STORM PREDICTION CENTER NORMAN OK
0212 PM CDT FRI MAY 31 2013
AREAS AFFECTED...ERN MN...NRN/CNTRL WI
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 311912Z - 312115Z
PROBABILITY OF WATCH ISSUANCE...80 PERCENT
SUMMARY...SURFACE-BASED TSTMS SHOULD INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON. LARGE HAIL AND ISOLATED DAMAGING WINDS
SHOULD BE THE PRIMARY THREATS BUT A COUPLE OF TORNADOES ARE ALSO
POSSIBLE.
DISCUSSION...BENEATH A BAND OF MID-LEVEL CONVECTION THAT HAS BEEN
EMANATING NEWD ACROSS NERN IA INTO NWRN WI...SURFACE-BASED TSTMS
HAVE BEGUN TO INITIATE ACROSS THE TWIN CITIES METRO AREA. A PLUME OF
MIDDLE 50S TO LOWER 60S SURFACE DEW POINTS HAS HELD DOWNSTREAM OF
THIS DEVELOPMENT. MODIFIED FORECAST SOUNDINGS SUGGEST THIS MOISTURE
PLUME ALONG WITH STEEP LOW/MID-LEVEL LAPSE RATES IS CONTRIBUTING TO
A FAIRLY LARGE BUOYANCY PROFILE DESPITE MLCAPE ONLY AROUND 1000-1500
J/KG. SUFFICIENT LOW-LEVEL SHEAR EXISTS FOR UPDRAFT ROTATION...BUT
FLOW WEAKENS WITH HEIGHT IN THE MID/UPPER-LEVELS WHERE CONVECTION IS
DEVELOPING ACROSS E-CNTRL MN/NWRN WI. MORE FAVORABLE DEEP-LAYER
SHEAR EXISTS FARTHER E/SE...SUGGESTING LONGEVITY OF SUPERCELLS WOULD
BE GREATER HERE.
..GRAMS/HART.. 05/31/2013
ATTN...WFO...MQT...GRB...DLH...ARX...MPX...
LAT...LON 46099300 46499247 46589178 46378987 45748878 45248858
44738881 44388963 44069096 44089200 44339262 44619311
45129324 46099300
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