Mesoscale Discussion 113

Issued

Feb 16, 2009, 5:30 AM CST (11:30 UTC)

Expired

Feb 16, 2009, 9:15 AM CST

In force

4 hr

Issued by

the Storm Prediction Center

The Santa Ana Mts radar (KSOX), 81 km from the middle of the area, began a volume at 11:30 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.

000 
ACUS11 KWNS 161130
SWOMCD
SPC MCD 161130 COR
CAZ000-161515-

MESOSCALE DISCUSSION 0113
NWS STORM PREDICTION CENTER NORMAN OK
0530 AM CST MON FEB 16 2009

AREAS AFFECTED...MOUNTAINS OF SRN CA

CONCERNING...HEAVY SNOW 

VALID 161130Z - 161515Z

CORRECTED FOR TYPOS ON GRAPHIC TEXT

SNOWFALL RATES UP TO 2 IN/HR ARE EXPECTED TO SPREAD EWD ACROSS THE
HIGHER TERRAIN OF SRN CA FROM SANTA BARBARA COUNTY TO LOS ANGELES
COUNTY THIS MORNING WITH SNOW LEVELS AROUND 4500 FEET.  SIMILAR
SNOWFALL RATES SHOULD DEVELOP OVER THE HIGHER TERRAIN OF SWRN SAN
BERNARDINO/WRN RIVERSIDE COUNTIES BY 18Z...BUT WITH SNOW LEVELS
STARTING AT AROUND 6000 FEET.

REGIONAL RADARS INDICATED A 60-70 MILE WIDE BAND OF PRECIPITATION/
WARM CONVEYOR BELT STREAMING NWD AND PRECEDING A COLD FRONT
APPROACHING THE CENTRAL/SRN CA COAST.  STRONG/MOIST SLY LOW LEVEL
FLOW EXTENDING INTO THE MOUNTAINS OF SANTA BARBARA TO LOS ANGELES
COUNTIES WILL RESULT IN FAVORABLE OROGRAPHIC ASCENT ALONG S FACING
SLOPES.  THIS COMBINED WITH INCREASING DIFFLUENT FLOW ALOFT AS A
SHORT WAVE TROUGH APPROACHES SRN CA WILL SUPPORT STRONG UVVS ACROSS
SRN CA THROUGH 18Z...FAVORING THE EXPECTED PRECIPITATION RATES.  THE
COLD FRONT IS EXPECTED TO MOVE INLAND ACROSS SANTA BARBARA TO
VENTURA COUNTIES BY 18Z...WITH PRE-FRONTAL PRECIPITATION BAND
SPREADING FARTHER INLAND TO SWRN SAN BERNARDINO/WRN RIVERSIDE
COUNTIES...INCLUDING THE BIG BEAR LAKE AREA.

..PETERS.. 02/16/2009

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

...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.

ATTN...WFO...VEF...SGX...HNX...LOX...

LAT...LON   34621970 34901974 34941913 34971877 35011851 34771851
            34661823 34541776 34411664 33801659 33391659 33401683
            33891694 34151711 34231784 34451838 34541868 34491922
            34621970

Every mesoscale discussion in 2009

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.