Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 210357
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
857 PM MST TUE JAN 20 2015

.SYNOPSIS...A WEATHER DISTURBANCE WILL TRACK EAST ACROSS NORTHERN
ARIZONA AND IMPACT EXTREME SOUTHERN UTAH TONIGHT THROUGH WEDNESDAY.
HIGH PRESSURE ALOFT WILL EXPAND ACROSS THE WESTERN STATES DURING
THE LATTER HALF OF THE WEEK.

&&

.DISCUSSION...A DEVELOPING MID-LEVEL CIRCULATION SOUTH OF LAS
VEGAS THIS EVENING WILL TRACK EAST ACROSS NORTHERN ARIZONA LATE
TONIGHT THROUGH WEDNESDAY MORNING. THIS MID-LEVEL FEATURE WILL
MOVE OVER THE TOP OF A NEAR 700MB MOISTURE CONVERGENCE BOUNDARY
STRETCHED WEST-TO-EAST ACROSS NORTHERN ARIZONA. PRECIP WILL FORM
ALONG AND NORTH OF THE CONVERGENCE ZONE...WITH SOME LIGHT PRECIP
SPILLING NORTH INTO EXTREME SOUTHERN UTAH OVERNIGHT. LIGHT SHOWERS
WILL LINGER IN THE 4-CORNERS REGION WEDNESDAY MORNING...THEN EXIT
THE FORECAST AREA BY AFTERNOON.

A FAIRLY STRONG UPPER RIDGE ALONG THE WEST COAST TUESDAY NIGHT
WILL SHIFT EAST AND THEN ROLLOVER ACROSS THE GREAT BASIN LATE IN
THE WEEK. A SHORTWAVE DIVING SOUTH AHEAD OF THE RIDGE WILL EVOLVE
INTO AN UPPER LOW OVER THE SOUTHERN ROCKIES BY THURSDAY. THE
RESULTANT NORTHEAST FLOW ALOFT ALONG WITH A FAIRLY STRONG SURFACE
HIGH OVER WYOMING COULD GENERATE A BRIEF PERIOD OF CANYON WINDS
ALONG THE NORTHERN WASATCH FRONT WEDNESDAY NIGHT...WITH A SECOND
AREA OF ENHANCED GAP/DOWNSLOPE WINDS IN WASHINGTON COUNTY THROUGH
THURSDAY.

THE UPPER HIGH WILL STRENGTHEN FURTHER TO THE WEST OF UTAH THIS
WEEKEND. VERY STABLE CONDITIONS WILL EXIST STATEWIDE WITH URBAN
HAZE AND SOME VALLEY FOG ON THE INCREASE LATE IN THE FORECAST
CYCLE.

&&

.AVIATION...LIGHT NORTHWEST WINDS ARE EXPECTED TO CONTINUE AT THE
KSLC TERMINAL THROUGH THE OVERNIGHT HOURS. THERE IS A 30 PERCENT
CHANCE THAT WINDS WILL BECOME LIGHT SOUTHEAST AFTER 0800 UTC.
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD.

&&

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

$$

PUBLIC...CONGER
AVIATION...

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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