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Mesoscale Discussion 1380 |
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MESOSCALE DISCUSSION 1380
NWS STORM PREDICTION CENTER NORMAN OK
0451 PM CDT SUN JUL 12 2015
AREAS AFFECTED...PORTIONS OF N-CNTRL KS/S-CNTRL/ERN NEB
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 122151Z - 122345Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...THE POTENTIAL EXISTS FOR A FEW STRONG/SEVERE THUNDERSTORMS
THIS EVENING...WITH LARGE HAIL/DAMAGING WINDS AS THE PRIMARY
THREATS. HOWEVER...DUE TO THE RELATIVELY LIMITED SPATIAL NATURE OF
THE THREAT...WW ISSUANCE IS NOT ANTICIPATED.
DISCUSSION...VIS SATELLITE IMAGERY LATE THIS AFTERNOON EXHIBITS
GROWING CU/TCU ACROSS PORTIONS OF N-CNTRL KS/S-CNTRL NEB...GENERALLY
NEAR AN ANALYZED SFC TROUGH/WEAK LOW. INDEED...THE LATEST WSR-88D
MOSAIC INDICATED INITIATION HAS OCCURRED OVER ELLIS AND GRAHAM
COUNTIES IN KS. AMPLE INSOLATION HAS YIELDED SFC TEMPS IN THE
90S/LOWER 100S...WITH A WELL-MIXED BOUNDARY LAYER PRESENT. IN
COMBINATION WITH SFC DEW POINTS IN THE UPPER 60S/LOWER 70S...STEEP
LAPSE RATES ALOFT HAVE YIELDED STRONG BUOYANCY...WITH MLCAPE VALUES
ON THE ORDER OF 2500-4500 J/KG /PER MESOANALYSIS DATA/. WHILE
CONVECTIVE COVERAGE WILL LIKELY BE SOMEWHAT LIMITED DUE TO A LACK OF
STRONG FORCING FOR ASCENT AND SOME DRY AIR AROUND THE LFC...ANY
UPDRAFTS THAT BECOME WELL-ROOTED/SUSTAINED IN THE BL SHOULD BE ABLE
TO UTILIZE ENHANCED FLOW ALOFT AND EFFECTIVE SHEAR UPWARDS OF 40
KTS. THE PRESENCE OF AMPLE BUOYANCY IN THE HAIL-GROWTH ZONE SHOULD
OFFER A LARGE-HAIL THREAT...AND THE WELL-MIXED/MOIST BL SHOULD
ENABLE A STRONG-WIND THREAT FOR A FEW HOURS THIS EVENING.
HOWEVER...DUE TO THE AFOREMENTIONED ISSUES IN TERMS OF SPARSE
CONVECTIVE COVERAGE...WW ISSUANCE IS NOT ANTICIPATED.
..PICCA/EDWARDS.. 07/12/2015
ATTN...WFO...OAX...TOP...ICT...GID...LBF...DDC...GLD...
LAT...LON 38880016 39230045 41409928 41989821 41799695 40109636
38879720 38369825 38259881 38599976 38880016
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