Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 210454
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1054 PM MDT FRI MAY 20 2016

.SYNOPSIS...A LOW PRESSURE SYSTEM WILL SLOWLY CROSS THE REGION
OVER THE WEEKEND...WITH UNSETTLED CONDITIONS LINGERING INTO NEXT
WEEK.

&&

.DISCUSSION...AN UPPER LOW SPINNING ACROSS THE GREAT BASIN THIS
EVENING IS INDUCING STRONG SOUTHERLY FLOW ALOFT ACROSS THE
FORECAST AREA. ON THE SYNOPTIC SCALE WINDS LARGELY SUBSIDED THIS
EVENING AS THE BOUNDARY LAYER DECOUPLED A BIT...HOWEVER WITH
CONSIDERABLE HIGH BASED SHOWERS/VIRGA DEVELOPING IN RESPONSE TO A
JET MAX ALONG THE DOWNSTREAM BAROCLINIC ZONE ALONG THE UT/NV
BORDER...OCCASIONAL DOWNBURSTS HAVE PUNCHED THROUGH THIS SHALLOW
DECOUPLED SURFACE LAYER AND WILL LIKELY CONTINUE TO DO SO INTO
THE OVERNIGHT HOURS. THE VAST MAJORITY OF GUSTS OVERNIGHT WILL
LIKELY REMAIN IN THE 40 MPH RANGE BUT WILL LIKELY SEE OCCASIONAL
LOCALIZED WINDS IN EXCESS OF 50 MPH.

THE EXTENSIVE CLOUD COVER COUPLED WITH THE SOUTHERLY WINDS WILL
ALSO ACT TO KEEP TEMPERATURES ELEVATED OVERNIGHT ACROSS MOST
ZONES...AND UPDATED THE MIN TEMPERATURE FORECAST TO RAISE TEMPS
AS WELL AS LOWER OVERNIGHT RH CONSIDERABLY.

A SHORTWAVE CURRENTLY ROUNDING THE BASE OF THE UPPER LOW ALONG THESIERRA
CREST IS FORECAST TO EJECT NORTHEAST ACROSS THE NORTHERN GREAT
BASIN SATURDAY MORNING PUSHING THE NORTH-SOUTH ORIENTED SURFACE
BOUNDARY THROUGH NORTHERN UT. CONVERGENCE ALONG THIS BOUNDARY
COUPLED WITH UPPER JET SUPPORT WILL RESULT IN AT LEAST SCATTERED
SHOWERS ACROSS NORTHERN UT. UPDATED POPS FOR THE MORNING HOURS TO
BOOST PRECIP CHANCES ACROSS THE NORTH.

ADDITIONALLY...SOUTHERLY WINDS WILL REMAIN STRONG AND GUSTY AHEAD
OF THIS BOUNDARY ACROSS THE SOUTHEASTERN CWA THROUGH MUCH OF THE
DAY. WENT AHEAD AND ISSUED A WIND ADVISORY FOR THE
SOUTHEAST.

&&

.AVIATION...A SOUTHERLY WIND DIRECTION WILL PREVAIL AT KSLC
THROUGH THE OVERNIGHT HOURS...HOWEVER SPEEDS AND GUSTS WILL LIKELY
BE ERRATIC WITH PASSING HIGH BASED SHOWERS. GUSTS WILL LIKELY
BRIEFLY EXCEED 30 KTS AT TIMES. SHOWERS WILL INCREASE AFTER 12Z
WITH CIGS LIKELY FALLING BELOW 7 KFT. A COLD FRONT WILL SHIFT
WINDS TO THE NORTHWEST AROUND 18Z SATURDAY.

&&

.SLC Watches/Warnings/Advisories...
UT...High Wind Warning until 10 PM MDT this evening for UTZ005.

WY...None.
&&

$$

SEAMAN/STRUTHWOLF

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http://weather.gov/saltlakecity

For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php



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