Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 200243
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
843 PM MDT SUN APR 19 2015

.SYNOPSIS...HIGH PRESSURE WILL BUILD ACROSS THE REGION THROUGH
TUESDAY...BEFORE AN UNSETTLED WEATHER PATTERN DEVELOPS FOR THE
MIDDLE TO LATTER PORTION OF THE WEEK.

&&

.DISCUSSION...NORTHWESTERLY FLOW ALOFT PREVAILS ACROSS THE
FORECAST AREA THIS EVENING...SANDWICHED BETWEEN AN UPPER TROUGH
WHICH ENCOMPASSES MUCH OF THE CENTRAL AND EASTERN CONUS...AND A
MEAN RIDGE POSITION ALONG THE WEST COAST. A WEAK SHORTWAVE
CROSSING SOUTHERN UT COMBINED WITH MODEST INSTABILITY TO ALLOW FOR
A FEW SHOWERS AND THUNDERSTORMS EARLIER ACROSS SOUTHEASTERN
PORTIONS OF THE FORECAST AREA. THESE HAVE SINCE WEAKENED AND MOVED
OUT OF THE AREA. MEANWHILE ANOTHER WEAK PERTURBATION EMBEDDED
WITHIN THE FLOW IS CROSSING SOUTHERN ID...AND INDUCING LITTLE MORE
THAN AN INCREASE IN MID AND HIGH LEVEL CLOUD COVER ACROSS NORTHERN
UT...WITH ANY APPRECIABLE PRECIPITATION REMAINING WELL EAST ACROSS
CENTRAL WY.

THE MID LEVEL RIDGE ALONG THE WEST COAST IS FORECAST TO BUILD
EASTWARD OVER THE NEXT COUPLE OF DAYS RESULTING IN A WARMING TREND
ACROSS THE FORECAST AREA. LINGERING MOISTURE WILL CONTINUE TO
SUPPORT A THREAT FOR ISOLATED TERRAIN BASED CONVECTION EACH DAY.
THE LATTER HALF OF THE WEEK CONTINUES TO LOOK UNSETTLED...WITH A
BROAD BUT DIFFUSE UPPER TROUGH DEVELOPING ACROSS THE WESTERN
CONUS WITH SEVERAL EMBEDDED CIRCULATIONS MEANDERING THROUGH
THROUGH THE FLOW. CONFIDENCE IN TERMS OF TIMING AND TRACK OF THESE
FEATURES REMAINS LOW...BUT THE OVERALL TREND LOOKS TO BE COOLER
AND WETTER FOR THE LATTER HALF OF THE WEEK.

WILL UPDATE TO REMOVE EVENING CONVECTION...OTHERWISE GOING
FORECAST APPEARS IN REASONABLE SHAPE.

&&

.AVIATION...WEST NORTHWEST TO NORTHWEST WINDS WILL CONTINUE AT THE
SLC TERMINAL INTO THE EVENING...SWITCHING TO THE SOUTH BETWEEN 02-
04Z.

&&

.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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