SWOMCD
SPC MCD 041833
AZZ000-NVZ000-CAZ000-042030-
MESOSCALE DISCUSSION 1994
NWS STORM PREDICTION CENTER NORMAN OK
0133 PM CDT FRI SEP 04 2009
AREAS AFFECTED...SRN NV/SRN CA BORDER EWD INTO EXTREME NWRN AZ
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 041833Z - 042030Z
ISOLD TSTMS MAY PRODUCE DMGG WINDS AND LARGE HAIL THROUGH EARLY EVE.
A WW IS UNLIKELY.
A MODEST PV-TROUGH CONTINUES TO TRANSLATE EWD INTO THE SRN SIERRA
AND SERN CA AT 1830Z AND SHOULD CONTINUE ENE ACROSS CNTRL/SRN NV AND
EXTREME NWRN AZ BY THIS EVENING. AROUND 1.25 INCH PWAT RESERVOIR
ACROSS SERN CA/WRN AZ WAS BEING TAPPED AHEAD OF THIS FEATURE WITH
SFC DEW POINTS EITHER BEING MAINTAINED OR SHOWING A DEG OR TWO
INCREASE SINCE LATE MORNING ACROSS THE LAS VEGAS VLY SWD.
TCU/CBS HAVE BEEN INCREASING ALONG THE HIGHER TERRAIN OF SERN CA AND
OVER THE SPRING AND SHEEP RANGES IN SRN NV. EXPECT A FURTHER
INCREASE IN MORE ROBUST STORMS THROUGH THE LATE AFTN WITH ACTIVITY
LIKELY PROPAGATING EWD OFF THE TERRAIN AS VLY INHIBITION WEAKENS AND
THE LARGER SCALE ASCENT MOVES E. ENHANCED HIGH-LVL FLOW ASSOCD WITH
THE TROUGH ATOP A VEERING LOW/MID-LVL PROFILE WILL ENHANCE VERTICAL
SHEAR FOR BRIEF STORM ORGANIZATION. STORM BASES WILL BE HIGHER
NORTH OF THE LAS VEGAS VLY WITH PRIMARILY AN ISOLD DMGG WIND THREAT.
FARTHER S...SUSTAINED STORM BASES WILL BE LOWER ALONG NRN EDGE OF
MORE SUBSTANTIAL PWATS. HERE...RISKS FOR BOTH DMGG WINDS AND LARGE
HAIL WILL EXIST...INCLUDING PARTS OF THE LAS VEGAS METRO AREA.
..RACY.. 09/04/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...VEF...LKN...REV...
LAT...LON 35171563 36221700 37091800 37801799 38811603 39091513
38951448 38611425 38001418 37101408 36041398 35251406
34971463 35171563
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