Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 311730
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1030 AM MST SAT JAN 31 2015

.SYNOPSIS...AN UPPER LOW WILL MOVE SOUTH OUT OF THE AREA THIS
EVENING. A MOIST WEST NORTHWEST FLOW WILL DEVELOP ACROSS THE
NORTHERN GREAT BASIN MONDAY AND CONTINUE INTO WEDNESDAY.

&&

.DISCUSSION...THE UPPER LOW CENTER OVER SRN NV THAT HAD BEEN
SENDING MOISTURE AND PRECIP INTO THE CWA IS WEAKENING AND
BECOMING ABSORBED INTO THE PRIMARY UPPER CIRCULATION CENTERED OVER
THE CENTRAL GULF OF CA.

UPSTREAM THE SHORT WAVE RIDGE ENTERING NRN UT FROM THE NORTH AT
THIS TIME IS HEADING SWD AND THE ASSOCIATED STRONG DRYING AND
SUBSIDENCE IS BRINGING CLEARING SKIES. THIS WILL CONTINUE TO PUSH
SWD TODAY AND REACH THE SRN UT BORDER BY THE END OF THE DAY.

PRECIP HAS COME TO AN END ACROSS ABOUT THE NRN 1/3 OF THE CWA AND
SHOULD BE ENDING ACROSS CENTRAL UT BY NOON OR SO. THIS SHOULD
ALLOW US TO CANCEL WINTER WEATHER HIGHLIGHTS FROM THE CENTRAL MTNS
NWD. THE REMAINING DEFORMATION ZONE ACROSS SRN UT SHOULD ALSO
DISSIPATE AND SHIFT SWD BY LATE TODAY BUT WILL LEAVE EXISTING
HIGHLIGHT IN EFFECT AND ALLOW IT TO EXPIRE THIS AFTN.

A FAIRLY TIGHT NORTHERLY SURFACE GRADIENT DEVELOPS ACROSS THE CWA
THIS AFTN AND PERSISTS ACROSS CENTRAL AND SRN UT TONIGHT. THIS
COULD BRING ENOUGH MIXING TO THESE AREAS TO SUFFICIENTLY DRY LOWER
LEVELS AND PRECLUDE MUCH FOG DEVELOPMENT TONIGHT.

THE UPSTREAM RIDGE JUST OFF THE COAST TODAY CROSSES THE CWA ON SUN
AND FLATTENS RAPIDLY SUN NIGHT AS A WEAK WAVE PASSES MAINLY TO OUR
NORTH. THIS WAVE DOES PUSH SOME MOISTURE INTO FAR NRN UT.

THIS PATTERN OF AN INCREASINGLY MOIST WNWLY FLOW OVER NRN UT
CONTINUES THRU TUE NIGHT WITH A CONTINUED CHANCE OF VALLEY RAIN
AND MTN SNOW FROM ABOUT SLC NORTH. THE LAST WAVE IN THIS SERIES IS
A BIT DEEPER AND PASSES ON WED BRINGING AN END TO THIS PRECIP
THREAT WED NIGHT.

UPDATED EARLIER TO MAKE SOME MINOR ADJUSTMENTS TO POPS AND SKY
COVER OVER THE NORTH. WILL LIKELY UPDATE AGAIN AROUND MIDDAY TO
CANCEL A PORTION OF THE SNOW ADVISORY.

&&

.AVIATION...TEMPORARY CEILINGS NEAR 7000 FEET AGL AT THE SLC
TERMINAL WILL CONTINUE THROUGH ABOUT 19Z. OTHERWISE...NORTH TO
NORTHWESTERLY WINDS WILL CONTINUE AT THE TERMINAL THROUGH THE DAY.

&&

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

$$

PUBLIC...WILENSKY
AVIATION...KRUSE

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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