Alert archive / California / Mesoscale Discussions in 2010

Mesoscale Discussion 13

January 19, 2010Orange County, Ventura County, California

The Storm Prediction Center issued this mesoscale discussion at Jan 19, 2010, 12:02 PM PST for Orange County, Ventura County, California. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jan 19, 2010, 12:02 PM PST (20:02 UTC)
Expired: Jan 19, 2010, 1:00 PM PST
In force: 58 min
Issued by: the Storm Prediction Center

Counties Orange County, CA, Ventura County, CA

The radar

The Santa Ana Mts radar (KSOX), 53 km from the middle of the area, began a volume at 20:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The text

As transmitted, in the capitals the NWS used until 2016.

393 
ACUS11 KWNS 192003
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

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 19, 3:56 AM PST	Mesoscale Discussion	SPC	Trinity	4 hr
Jan 19, 9:22 AM PST	Mesoscale Discussion	SPC	Santa Barbara, Ventura	83 min
Jan 19, 3:53 PM PST	Mesoscale Discussion	SPC	Fresno, Merced, Napa, Sacramento, San Joaquin, Solano and 3 more	97 min

Nearby

Mesoscale Discussions in California, 2010 Every mesoscale discussion in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.