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Mesoscale Discussion 1732 |
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MESOSCALE DISCUSSION 1732
NWS STORM PREDICTION CENTER NORMAN OK
0235 PM CDT SAT AUG 22 2015
AREAS AFFECTED...FAR ERN ND...NRN MN
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 221935Z - 222030Z
PROBABILITY OF WATCH ISSUANCE...80 PERCENT
SUMMARY...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE/INTENSITY
ACROSS PARTS OF ERN ND AND NWRN/N-CNTRL MN INTO THE EARLY EVENING.
THE POTENTIAL FOR LARGE HAIL...DMGG WIND GUSTS...AND A COUPLE
TORNADOES WILL EXIST...AND A TORNADO WATCH WILL LIKELY BE NEEDED BY
20-21Z.
DISCUSSION...FORCING FOR ASCENT ACCOMPANYING A SEASONABLY STRONG
MIDLEVEL TROUGH IS QUICKLY SPREADING EWD ACROSS THE NRN PLAINS...AND
IS APPROACHING A N-S ORIENTED COLD FRONT POSITIONED OVER FAR ERN ND.
PERSISTENT STRATUS HAS BEEN NOTED ON VISIBLE SATELLITE THIS MORNING
AND AFTERNOON...WHICH HAS INHIBITED SFC HEATING WITH TEMPERATURES
ONLY IN THE UPPER 60S TO LOW 70S...BUT DEWPOINTS HAVE INCREASED TO
THE MID-UPPER 60S. WHILE THIS WILL LIMIT BUOYANCY SOMEWHAT...STEEP
MIDLEVEL LAPSE RATES ARE ALREADY IN PLACE...AND THE DEGREE OF DPVA
ACCOMPANYING THE MIDLEVEL TROUGH WILL BE SUFFICIENT FOR CONVECTIVE
DEVELOPMENT ALONG/AHEAD OF THE COLD FRONT.
A SEPARATE PRE-SFC-FRONTAL BAND OF MOISTENING/ASCENT WAS ALSO NOTED
ON WATER VAPOR LOOP ACROSS CNTRL MN...AND THIS COULD PROVIDE AN
ADDITIONAL FOCUS FOR CONVECTIVE DEVELOPMENT THIS AFTERNOON AND AN
ACCOMPANYING RISK FOR LARGE HAIL AND DMGG WINDS IS EXPECTED TO
DEVELOP. TORNADO THREAT WILL BE DEPENDENT ON STORM MODE...FAVORING
INITIAL CLUSTER/DISCRETE STORMS ALONG/AHEAD OF THE FRONT.
WITH LATEST CONVECTIVE TRENDS SHOWING SHOWER/TSTM DEVELOPMENT
INCREASING ALONG THE COLD FRONT ACROSS SERN ND...A TORNADO WATCH
WILL BE CONSIDERED SOON FOR PARTS OF FAR ERN ND INTO NWRN/N-CNTRL
MN.
..ROGERS/CORFIDI.. 08/22/2015
ATTN...WFO...DLH...MPX...FGF...ABR...
LAT...LON 49049778 49099589 49079448 48219269 46629301 46209387
45919601 45989765 46669771 49049778
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