SWOMCD
SPC MCD 192002
CAZ000-192100-
MESOSCALE DISCUSSION 0013
NWS STORM PREDICTION CENTER NORMAN OK
0202 PM CST TUE JAN 19 2010
AREAS AFFECTED...SRN CA COAST--INCLUDING THE LOS ANGELES METRO AREA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 192002Z - 192100Z
THE POTENTIAL FOR ISOLATED SEVERE WEATHER IS EXPECTED TO INCREASE
ACROSS PARTS OF LOS ANGELES AND ORANGE COUNTIES BY 2030-2100Z. A WW
IS POSSIBLE.
LOCAL RADAR IMAGERY INDICATES A STEADY INTENSIFICATION TO TSTM
CLUSTER W OF CATALINA ISLAND...WITH A SECONDARY...SHORT LINE SEGMENT
APPROACHING THE VENTURA COUNTY COAST NEAR OXNARD AS OF 1945Z. THIS
ACTIVITY IS ASSOCIATED WITH A PROGRESSIVE VORTICITY MAXIMUM
APPROACHING THE SRN CA COAST...ALONG CYCLONIC SIDE OF STRONG...LOW
LATITUDE JET STREAK.
WIDESPREAD CLOUDINESS CONTINUES TO LIMIT DIABATIC HEATING TODAY WITH
TEMPERATURES LINGERING IN THE MID/UPPER 50S ALONG THE IMMEDIATE
COAST. THIS IS IN GOOD AGREEMENT WITH RUC PROXIMITY SOUNDINGS WHICH
SUGGEST THAT SIMILAR BOUNDARY LAYER CONDITIONS ARE YIELDING MLCAPE
OF 200-300 J/KG. WHEN COUPLED WITH THE STRONG VERTICAL SHEAR
OBSERVED BY AREA VWPS AND ACCOMPANYING RUC FORECAST WIND
PROFILE...ENVIRONMENT ALONG COAST IS EXPECTED TO REMAIN FAVORABLE
FOR ROTATING STORMS THROUGH MID/LATE AFTERNOON. STRONG WIND GUSTS
AND PERHAPS A BRIEF TORNADO APPEAR TO BE THE PRIMARY SEVERE WEATHER
HAZARDS.
CHARACTER OF ONGOING STORMS SITUATED SW OF THE LOS ANGELES METRO
AREA WILL BE MONITORED CLOSELY FOR PERSISTENT SUPERCELL STRUCTURE
WHICH WOULD POTENTIALLY REQUIRE A WW.
..MEAD.. 01/19/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SGX...LOX...
LAT...LON 33211706 33061734 33471794 33641851 33941930 34311954
34521940 34271852 33601731 33211706
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