SPC MD 1665

MD 1665 CONCERNING SEVERE THUNDERSTORM WATCH 483… FOR SWRN KS…OK/TX PANHANDLES


MESOSCALE DISCUSSION 1665
NWS STORM PREDICTION CENTER NORMAN OK
1130 PM CDT WED AUG 07 2013

AREAS AFFECTED...SWRN KS...OK/TX PANHANDLES

CONCERNING...SEVERE THUNDERSTORM WATCH 483...

VALID 080430Z - 080530Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 483
CONTINUES.

SUMMARY...GREATEST SHORT-TERM SEVERE WEATHER THREAT EXISTS OVER THE
ERN OK/TX PANHANDLES...AS WELL AS PORTIONS OF SWRN KS LOCATED
ADJACENT TO THE OK BORDER. THREAT SHOULD BE MORE ISOLATED IN NATURE
OVER WRN KS DUE TO STABILIZING EFFECTS OF WIDESPREAD STRATIFORM
RAINFALL.

DISCUSSION...SURFACE OBSERVATIONS AT 04Z INDICATE TEMPERATURES ARE
IN THE LOW 80S OVER FAR ERN PORTIONS OF THE OK/TX PANHANDLES...AND
WITH DEWPOINTS IN THE MID 60S TO LOW 70S...HIGH THETA-E AIRMASS WITH
MLCAPE VALUES AOA 1500 J/KG PERSISTS. IN ADDITION...ELY WINDS IN THE
LOWEST 1-2 KM AGL ARE AIDING IN MCS MAINTENANCE AND DOWNSHEAR
PROPAGATION AT 30-40 KT. SMALL BOW ECHO HAS FORMED AS A RESULT...AND
WILL POSE THE GREATEST THREAT FOR DAMAGING WINDS ACROSS WW 483.
STORMS MAY LINGER WITHIN THE WATCH OVER OK/TX PAST THE 05Z
EXPIRATION...WHICH COULD REQUIRE AN EXTENSION IN TIME BY WFO/S.

FARTHER N OVER PORTIONS OF WRN KS...COMPOSITE RADAR IMAGERY SHOWS A
SMALL LINE OF HIGHER REFLECTIVITY EMBEDDED WITHIN STRATIFORM
RAINFALL. BOUNDARY LAYER AIRMASS IS COOLER AS A RESULT...WHICH WILL
LIKELY HINDER A MORE SUBSTANTIAL SEVERE WEATHER THREAT. WW 483 CAN
PROBABLY BE ALLOWED TO EXPIRE ON TIME FOR THESE LOCATIONS.

..GARNER.. 08/08/2013

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...OUN...DDC...GLD...LUB...AMA...

LAT...LON   38680204 38690113 37919959 36999955 36990001 34740000
            34740162 35620163 35600216 36490216 36500203 36990203
            36990108 38260111 38260203 38680204

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