ACUS11 KWNS 232039
SWOMCD
SPC MCD 232039
NVZ000-ORZ000-CAZ000-232215-

MESOSCALE DISCUSSION 0582
NWS STORM PREDICTION CENTER NORMAN OK
0339 PM CDT MON APR 23 2012

AREAS AFFECTED...SRN ORE...NRN CA...NW NV

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 232039Z - 232215Z

A MARGINAL WIND DAMAGE AND HAIL THREAT SHOULD EXIST ACROSS NRN
CA...NW NV AND SRN ORE THIS AFTERNOON. THE THREAT SHOULD REMAIN TOO
ISOLATED TO WARRANT WW ISSUANCE.

THUNDERSTORMS ARE DEVELOPING IN NRN CA AND NW NV ALONG THE ERN EDGE
OF MODERATE INSTABILITY WHERE MLCAPE VALUES ARE ESTIMATED FROM 750
TO 1200 J/KG. THE STORMS ARE INCREASING IN COVERAGE DUE TO SFC
HEATING AND TOPOGRAPHIC FORCING FROM THE SIERRA NEVADA. AS THE CELLS
SPREAD NWD INTO THE LOWER ELEVATIONS THIS AFTERNOON...STEEP LAPSE
RATES AND MODERATE DEEP LAYER SHEAR MAY BE ENOUGH FOR A HAIL THREAT.
IN ADDITION...SFC TEMPERATURE-DEWPOINT SPREADS EXCEED 40 DEGREES
ACROSS MUCH OF THE MCD AREA SUGGESTING DOWNBURSTS MAY BE ENHANCED
ENOUGH TO POSE AN ISOLATED WIND DAMAGE THREAT FOR A FEW HOURS THIS
AFTERNOON.

..BROYLES.. 04/23/2012

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

ATTN...WFO...REV...MFR...STO...

LAT...LON   39622013 39552069 40162134 41912213 43062208 43512133
            43112075 42022043 41222016 40321965 39622013

WWWW