Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 210230
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
830 PM MDT WED MAY 20 2015

.SYNOPSIS...SEVERAL WEATHER DISTURBANCES WILL CROSS THE GREAT
BASIN THROUGH THURSDAY NIGHT. SEVERAL AREAS OF LOW PRESSURE WILL
CROSS THE GREAT BASIN FRIDAY THROUGH TUESDAY.

&&

.DISCUSSION...A BROAD UPPER TROUGH IS SITUATED ALONG THE PACIFIC
COAST THIS EVENING...INDUCING A DEEP LAYER SOUTHWESTERLY FLOW
ALOFT DOWNSTREAM ACROSS THE GREAT BASIN. A SHORTWAVE TROUGH
EMBEDDED WITHIN THIS FLOW IS CURRENTLY LIFTING NORTHEAST ACROSS
EASTERN NV/WEST CENTRAL UT...AND LARGE SCALE ASCENT AHEAD OF THIS
FEATURE CONTINUES TO WORK ON A MODESTLY MOIST UNSTABLE AIRMASS
ACROSS NORTHERN UT TO PRODUCE SCATTERED SHOWERS AND THUNDERSTORMS.
THE BOUNDARY LAYER HAS DRIED OUT CONSIDERABLY OVER WHAT HAD BEEN
OBSERVED IN RECENT DAYS...AND THUS ARE SEEING A MORE IN THE WAY OF
LOCALLY STRONG MICROBURST WINDS WITH THIS ACTIVITY.

IN THE WAKE OF THIS WAVE SUBSIDENCE HAS OVERSPREAD MUCH OF
SOUTHERN UT RESULTING IN MOSTLY CLEAR SKIES THIS EVENING. AS THIS
WAVE CONTINUES NORTHWARD AND EVENTUALLY EXITS NORTHERN UT
OVERNIGHT SHOULD SEE A CONTINUED DOWNWARD TREND IN CONVECTIVE
ACTIVITY FROM SOUTH TO NORTH. UPDATED THE FORECAST TO REMOVE POPS
AND REDUCE SKY COVER ACROSS SOUTHERN UT...AS WELL AS KEEP POPS
ACROSS THE NORTH IN THE SCATTERED CATEGORY.

ANOTHER EJECTING WAVE IS FORECAST TO WORK ITS WAY ACROSS THE
FORECAST AREA DURING THE DAY THURSDAY...LIKELY RESULTING IN
ANOTHER ROUND OF SCATTERED CONVECTION DURING THE AFTERNOON AND
EVENING HOURS. THE MAIN UPPER TROUGH ALONG THE COAST IS FORECAST
TO SLOWLY MOVE INLAND FRIDAY THROUGH MUCH OF THE UPCOMING
WEEKEND...WITH A SECONDARY WAVE POSSIBLY DROPPING INTO THE
FORECAST AREA FROM THE NORTHWST FOR MEMORIAL DAY. THE END RESULT
LOOKS TO BE A FAIRLY COOL AND UNSETTLED WEEKEND ACROSS THE
FORECAST AREA.

&&

.AVIATION...NORTHERLY OUTFLOW WINDS WILL LIKELY PREVAIL AT KSLC
THROUGH ROUGHLY 04Z BEFORE DIMINISHING AND SWITCHING BACK TO THE
SOUTH. THERE REMAINS A 30 PERCENT CHANCE ADDITIONAL SHOWERS WILL
IMPACT THE TERMINAL THROUGH AROUND 07Z OR SO WITH THE POTENTIAL
FOR GUSTY ERRATIC WINDS. CONDITIONS ARE EXPECTED TO REMAIN VFR
THROUGHOUT...HOWEVER MAY SEE CIGS BRIEFLY DROP INTO THE 5000 FOOT
RANGE WITH THESE SHOWERS.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...NONE.
WY...NONE.
&&

$$

SEAMAN

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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