SWOMCD
SPC MCD 051730
UTZ000-IDZ000-NVZ000-051930-
MESOSCALE DISCUSSION 0950
NWS STORM PREDICTION CENTER NORMAN OK
1230 PM CDT FRI JUN 05 2009
AREAS AFFECTED...NW NV...W CNTRL AND NW UT...INTO PARTS OF SRN ID
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 051730Z - 051930Z
A SEVERE THREAT MAY INCREASE DURING THE 18-21Z TIME FRAME...MAINLY
SOUTH/WEST OF THE SALT LAKE CITY AREA...ACROSS WEST CENTRAL/
NORTHWEST UTAH. THIS MAY BE FAIRLY LOCALIZED...AND A WATCH IS NOT
CURRENTLY ANTICIPATED...BUT TRENDS WILL BE MONITORED.
SCATTERED THUNDERSTORM DEVELOPMENT IS NOW WELL UNDERWAY... SUPPORTED
BY FORCING FOR UPWARD VERTICAL MOTION IN THE EXIT REGION OF A
MID/UPPER JET STREAK NOSING NORTHEASTWARD TO THE EAST OF THE CLOSED
LOW CENTER NEAR THE CENTRAL CALIFORNIA COAST. MID-LEVEL COOLING
COUPLED WITH BOUNDARY LAYER HEATING IS CONTRIBUTING TO STEEPENING
LAPSE RATES...WITH STRONGEST DESTABILIZATION LIKELY TO BECOME
FOCUSED...BETWEEN NOW AND 21Z...NEAR A NARROW AXIS OF HIGHER
MOISTURE CONTENT AIR PRESENT ACROSS THE GREAT SALT LAKE
DESERT...PERHAPS INTO PARTS OF THE UPPER SNAKE VALLEY. MIXED LAYER
CAPE COULD EXCEED 1000 J/KG...AS 50-60 KT 500 MB FLOW OVERSPREADS
WEST CENTRAL/NORTHWEST UTAH. THIS WILL PROVIDE A FAVORABLE
ENVIRONMENT FOR SUPERCELLS...CAPABLE OF PRODUCING AT LEAST LARGE
HAIL. DOWNWARD TRANSPORT OF MOMENTUM IN DOWNDRAFTS MAY SUPPORT
DAMAGING WIND GUSTS...PARTICULARLY IN AREAS NOT SIGNIFICANTLY
IMPACTED BY ONGOING CONVECTION.
..KERR.. 06/05/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SLC...PIH...BOI...LKN...
LAT...LON 41551465 42571459 43221312 41781209 40351244 39481314
39401395 40261451 41551465
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