MESO: Mesoscale Discussion 0068

ACUS11 KWNS 070703
SWOMCD
SPC MCD 070703
UTZ000-NVZ000-CAZ000-071000-

MESOSCALE DISCUSSION 0068
NWS STORM PREDICTION CENTER NORMAN OK
0103 AM CST SAT FEB 07 2009

AREAS AFFECTED...CENTRAL SIERRAS AND PARTS OF THE CENTRAL GREAT
BASIN

CONCERNING...HEAVY SNOW

VALID 070703Z - 071000Z

A CORRIDOR OF INTERMITTENT HEAVY SNOWFALL RATES AROUND AN INCH/HR
WILL DEVELOP OVER PARTS OF THE CENTRAL GREAT BASIN THROUGH 12Z.
LOCALLY HIGHER RATES UP TO 2 INCHES/HR WILL LIKELY CONTINUE IN
HIGHER ELEVATIONS OF THE CENTRAL SIERRAS.

LATEST SATELLITE IMAGERY DENOTES A MID LEVEL DRY SLOT IMPINGING UPON
THE SIERRAS. 06Z ANALYSIS DEPICTS AN EAST TO WEST ORIENTED LOW
LEVEL BAROCLINIC ZONE OVER PARTS OF CENTRAL NV. WIND PROFILES FROM
ESX AND LRX VWP/S SUPPORT THIS NOTION WITH PRONOUNCED VEERING IN THE
0-4KM AGL LAYER. WITHIN THIS HIGHLIGHTED ZONE...AN ELY COMPONENT TO
THE FLOW THROUGH 500MB WILL ENHANCE OROGRAPHIC LIFT ON THE E SLOPES
OF THE CENTRAL SIERRAS. SUBTLE MID-LEVEL PERTURBATIONS ROTATING
AROUND THE PERIPHERY OF AN UPPER LOW /CURRENTLY LOCATED OVER COASTAL
AREAS OF CENTRAL CA/...WILL PROVIDE AMPLE FORCING FOR UPWARD
VERTICAL MOTION. ADDITIONALLY...LAPSE RATES MAY STEEPEN FURTHER
WITH TIME IN LOCATIONS CLOSER TO THE UPPER LOW...SUGGESTING SOME
POTENTIAL FOR CONVECTIVELY-ENHANCED SNOWFALL RATES OVER PARTS OF THE
SIERRAS.

..SMITH.. 02/07/2009

...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...SLC...VEF...LKN...REV...HNX...STO...

LAT...LON 39021457 38591722 38051835 37491846 37361900 38171989
38551994 39101879 39581724 39941544 40131430 40041379
39351368 39101415 39021457

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