Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 301604
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1004 AM MDT SAT APR 30 2016

.SYNOPSIS...THE NEXT PACIFIC STORM SYSTEM WILL CROSS FROM
SOUTHERN NEVADA INTO ARIZONA AND SPREAD MOISTURE ACROSS FAR SOUTHERN
AND EASTERN UTAH THIS WEEKEND. HIGH PRESSURE ALOFT WILL RETURN TO
THE INTERIOR WEST BY THE MIDDLE OF NEXT WEEK.

&&

.DISCUSSION...A LONGWAVE TROUGH IS NOTED IN WATER VAPOR IMAGERY
ENCOMPASSING MUCH OF THE WESTERN AND CENTRAL CONUS...WITH A COUPLE
OF WELL DEFINED EMBEDDED CIRCULATIONS ROTATING THROUGH THE MEAN
FLOW. MOST RELEVANT FOR THE FORECAST AREA IS THE UPPER LOW
CURRENTLY DROPPING SOUTH THROUGH THE SOUTHERN GREAT BASIN/LOWER CO
RIVER VALLEY. PRECIPITATION WITHIN THE NORTHEAST QUADRANT OF THIS
LOW HAS LIFTED NORTHWARD ACROSS FAR SOUTHERN UT THIS MORNING. AS
THE UPPER LOW CONTINUES INTO AZ TODAY THE BEST FORCING
ACCOMPANYING THE WAVE WILL LIKEWISE SHIFT SOUTH...HOWEVER
AMPLE LINGERING MOISTURE WILL SUPPORT SHOWERS AND ISOLATED
THUNDERSTORMS THIS AFTERNOON.

ATTENTION THIS EVENING TURNS TO A FAVORABLE SETUP FOR STRONG
DOWNSLOPE WINDS ALONG THE NORTHERN WASATCH FRONT...WERE A
COMBINATION OF STOUT EASTERLY FLOW...A RIBBON OF COLD ADVECTION
AND A FAVORABLE GRADIENT ALL COME TOGETHER TO SUPPORT A DOWNSLOPE
WIND EVENT BEGINNING THIS EVENING...AND CONTINUING THROUGH SUNDAY
MORNING BEFORE DIMINISHING DURING THE AFTERNOON. THE STRONGEST
WINDS ARE EXPECTED WITHIN THE CORRIDOR FROM NORTH SALT LAKE
THROUGH FARMINGTON AND CENTERVILLE WHERE GUSTS IN EXCESS OF 70 MPH
APPEAR POSSIBLE. GUSTY WINDS ARE ALSO EXPECTED IN NORTHEAST SALT
LAKE COUNTY FROM PARLEYS NORTHWARD TO THE UNIVERSITY...AND TO A
LESSER EXTENT THROUGH PROVO CANYON AS WELL AS EASTERN CACHE
VALLEY. CURRENT HIGH WIND WATCH WILL BE UPGRADED FOR THE NORTHERN
WASATCH FRONT THIS AFTERNOON...AND WILL NEED TO CONSIDER
ADDITIONAL WIND HEADLINES FOR THE REMAINING AREAS MENTIONED ABOVE.

UPDATED EARLIER TO REMOVE MORNING POPS...OTHERWISE GOING SHORT
TERM FORECAST LOOKS IN GOOD SHAPE.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT
THE DAY WITH SOME HIGH AND MID LEVEL CLOUDS. NORTHWEST WINDS ARE
EXPECTED THROUGHOUT THE DAY...TURNING MORE NORTHEASTERLY BY THE
EVENING.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...HIGH WIND WATCH FROM LATE TONIGHT THROUGH SUNDAY AFTERNOON FOR
     UTZ001-002.

WY...NONE.
&&

$$

SEAMAN/TRAPHAGAN

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION
VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP (ALL LOWER CASE)


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