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Mesoscale Discussion 136 |
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MESOSCALE DISCUSSION 0136
NWS STORM PREDICTION CENTER NORMAN OK
0553 PM CDT TUE MAR 24 2015
AREAS AFFECTED...PORTIONS SERN OK...NE TX NEAR RED RIVER...SWRN AR.
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 242253Z - 250130Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...AREAS S AND SW OF WW 5 ARE BEING MONITORED FOR CONVECTIVE
TRENDS THAT WOULD INDICATE SUBSTANTIAL BACKBUILDING OR NEW
DEVELOPMENT. ANY SUSTAINED CONVECTION MAY PRODUCE STG/DAMAGING
GUSTS AND SVR HAIL. ATTM AREA AFFECTED AND LIKELY TIME WINDOW FOR
ANY SVR THREAT EACH APPEAR SMALL...RISK BEING MORE MRGL AND
CONDITIONAL WITH SWWD EXTENT.
DISCUSSION...SFC MESOANALYSIS SHOWS LOW ESSENTIALLY COLLOCATED WITH
SVR CONVECTION OVER SWRN MO IN WW 5...WITH COLD FRONT EXTENDING SWWD
ACROSS ERN/SRN OK NEAR TQH...MKO...ADH...15 NNW ADM...THEN SWWD
ACROSS NW TX JUST S SPS. FRONT SHOULD CONTINUE TO MOVE SEWD 10-15
KT...OVERTAKING DRYLINE THAT EXTENDS FROM FRONTAL INTERSECTION NEAR
ADM...SSWWD BETWEEN RPH-MWL. CONFLUENCE LINE WAS EVIDENT ON SFC
CHART BETWEEN ADM-MLC...CORRESPONDING WELL TO NNE-SSW-ORIENTED
BUNCHING OF CONVECTIVE CLOUDS FROM HUGHES COUNTY OK SSWWD TOWARD
DTO. FLOW HAS VEERED AHEAD OF DRYLINE AND W OF CONFLUENCE
LINE...AND SHOULD REMAIN SO FOR AT LEAST A COUPLE MORE HOURS.
FRONT AND CONFLUENCE LINE SHOULD REMAIN PRIMARY FOCI FOR TCU AND
PSBL CB FOR A FEW MORE HOURS BEFORE ENOUGH DIABATIC COOLING OCCURS
TO STRENGTHEN PRESENTLY WEAK MLCINH. NARROW CORRIDOR OF UPPER-50S
TO LOW-60S F SFC DEW POINTS AND 11-12 G/KG MEAN MIXING
RATIO...BENEATH 8 DEG C/KM MIDLEVEL LAPSE RATES...SUPPORTS MLCAPE
1500-2500 J/KG AS ESTIMATED FROM MODIFIED MODEL SOUNDINGS. TIME
WINDOW OF OPTIMALLY WEAK CINH WILL BE THROUGH ABOUT 01Z. THOUGH
0-1-KM HODOGRAPHS ARE SMALL DUE TO VEERED/WEAK SFC WINDS...0-3 KM
SRH AROUND 150 J/KG AND 35-45-KT EFFECTIVE-SHEAR MAGNITUDES MAY
SUPPORT SOME TSTM ORGANIZATION.
..EDWARDS/HART.. 03/24/2015
ATTN...WFO...LZK...SHV...TSA...FWD...OUN...
LAT...LON 34729344 33959414 33619493 33679583 34079669 34529684
34739654 35059605 34709604 34589550 34569435 34729344
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