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Mesoscale Discussion 1496 |
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MESOSCALE DISCUSSION 1496
NWS STORM PREDICTION CENTER NORMAN OK
0350 PM CDT MON JUL 20 2015
AREAS AFFECTED...MO
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 202050Z - 202245Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...PORTIONS OF THE OZARK PLATEAU EAST TO THE MISSOURI
BOOTHEEL ARE BEING MONITORED FOR THE DEVELOPMENT OF STRONG TO SEVERE
STORMS LATE THIS AFTERNOON. A WATCH MAY BE NEEDED IF STORM COVERAGE
AND INTENSITY INCREASE OVER THE REGION LATER TODAY.
DISCUSSION...VERY UNSTABLE CONDITIONS HAVE DEVELOPED ACROSS SRN MO
THIS AFTERNOON AS TEMPERATURES CLIMB INTO THE 90S AMIDST A VERY
MOIST AIRMASS WITH HIGH PW VALUES AROUND 2 INCHES. A WEAK
BOUNDARY/STATIONARY FRONT LEFT IN THE WAKE OF A MORNING MCS APPEARS
TO BE SITUATED FROM NEAR THE BOOTHEEL NWWD TO WHERE IT INTERSECTS
ANOTHER BOUNDARY/WIND SHIFT EXTENDING NEWD FROM OK. MEANWHILE...A
COLD FRONT IS APPROACHING THE REGION FROM THE NORTHWEST.
DESPITE WARM TEMPERATURES ALOFT...IT APPEARS WEAK LARGE SCALE ASCENT
ASSOCIATED WITH SHORTWAVE TROUGH PASSING ACROSS THE GREAT LAKES
REGION...IN CONCERT WITH CONTINUED DESTABILIZATION AND MESOSCALE
LIFT ALONG INTERSECTING BOUNDARIES...SHOULD ACT TO PROMOTE STORM
DEVELOPMENT OVER THE NEXT FEW HOURS. A FEW OF THESE STORMS COULD BE
STRONG TO SEVERE GIVEN MAGNITUDE OF AVAILABLE INSTABILITY AND MODEST
MIDLEVEL FLOW AROUND 30KT. WHETHER THESE STORMS PERSIST SUFFICIENTLY
TO WARRANT A WATCH REMAINS SOMEWHAT UNCERTAIN. IT IS ALSO POSSIBLE
CONVECTION MAY ORGANIZE LINEARLY ALONG THE ADVANCING FRONT LATER
THIS EVENING WITH SOME INCREASING POTENTIAL FOR DAMAGING WINDS.
..CARBIN/CORFIDI.. 07/20/2015
ATTN...WFO...PAH...MEG...LSX...SGF...EAX...
LAT...LON 38689441 38549290 37679136 37658972 36848940 36168986
36509006 36529223 36549365 36519452 37439452 38109453
38689441
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