Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 220338
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
938 PM MDT THU MAY 21 2015

.SYNOPSIS...THE LOW PRESSURE SYSTEM OFF THE CALIFORNIA COAST WILL
MOVE INLAND TONIGHT...THEN TURN NORTHEAST AND SLOWLY TRACK NORTHEAST
THROUGH THE GREAT BASIN THIS WEEKEND.

&&

.DISCUSSION...AN UPPER LEVEL LOW CENTERED OVER THE CENTRAL/SOUTHERN
CALIFORNIA COAST THIS EVENING WILL CONTINUE TO TRACK SOUTHEAST
OVERNIGHT. DOWNSTREAM OF THIS SYSTEM...UTAH REMAINS UNDER A
SOUTHERLY FLOW ALOFT. CONVECTIVE STORMS...DRIVEN MAINLY BY A WEAK
SHORTWAVE DISTURBANCES LIFTING THROUGH THE AREA AND MEAN DIFFLUENT
FLOW ALOFT IS STRONGEST CURRENTLY OVER PORTIONS OF NORTHERN UTAH. AS
THE WAVE DRIVING THIS EXITS NORTH...EXPECT ACTIVITY TO DECREASE
OVERNIGHT. HOWEVER...ANOTHER WEAK DISTURBANCE IS EVIDENT ACROSS
NORTHEAST ARIZONA AT THIS TIME AND IS PROGGED TO LIFT ACROSS EASTERN
UTAH...SPREADING ASSOCIATED PRECIPITATION THROUGH THIS AREA TONIGHT
INTO TOMORROW MORNING.

THE UPPER LOW IS PROGGED TO CROSS THE LAKE MEAD AREA LATE TOMORROW
AFTERNOON BEFORE LIFTING NORTHEAST ACROSS SOUTHERN/EASTERN UTAH.
EXPECT SHOWERS AND THUNDERSTORMS TO DEVELOP AGAIN ACROSS MUCH OF THE
AREA OWING TO THE SOMEWHAT MOIST AND UNSTABLE AIRMASS AND LARGE-
SCALE LIFT AHEAD OF THE LOW. HOWEVER...SATURDAY WILL BE POTENTIALLY
MORE WET AS MOISTURE WRAPS AROUND THE LOW AS IT TRACKS INTO
COLORADO/WYOMING.

UPDATED FORECAST MAINLY TO ADJUST POP/SKY FOR THE REMAINDER OF THE
NIGHT.

&&

.AVIATION...SOUTHWESTERLY WINDS WILL BECOME ESTABLISHED AT THE KSLC
TERMINAL BY 04Z. OTHERWISE...VFR CONDITIONS ARE EXPECTED TO PREVAIL
THROUGH THE NIGHT WITH CIGS ABOVE 7000FT AGL. THERE IS A 10 PERCENT
CHANCE OF SHOWERS LOWERING CIGS BELOW 7000FT AGAIN OVERNIGHT.

&&


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

$$

CHENG

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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