322
FXUS65 KSLC 222313
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
413 PM MST WED JAN 22 2020
SYNOPSIS
HIGH PRESSURE ALOFT WILL SHIFT EAST ACROSS THE GREAT
BASIN AND BRING MORE STABLE CONDITIONS TO THE AREA TOMORROW. A FAST-
MOVING TROUGH WILL CROSS NORTHERN UTAH ON FRIDAY, FOLLOWED BY
ANOTHER STORM SYSTEM ON MONDAY.
SHORT TERM (THROUGH 12Z SATURDAY)
THE UPPER TROUGH AND
ASSOCIATED JET AXIS HAS SHIFTED EAST OF THE AREA THIS AFTERNOON.
MEANWHILE, THE 700MB BAROCLINIC ZONE HAS WEAKENED ACROSS THE SALT
LAKE AND UTAH VALLEYS. AS SUCH, PRECIPITATION HAS BEEN ON THE
DECLINE THE PAST SEVERAL HOURS, ALTHOUGH LOW CLOUDS AND LIGHT
MOUNTAIN SNOWFALL CONTINUE TO PERSIST ACROSS PORTIONS OF NORTHERN
UTAH.
WARM ADVECTION HAS ALREADY BEGUN JUST UPSTREAM, AND WILL SHIFT
ACROSS NORTHERN UTAH TONIGHT INTO TOMORROW MORNING. A SLIGHT UPTICK
IN SNOW IS EXPECTED ACROSS MAINLY THE NORTHERN MOUNTAINS WITH THIS
WARM ADVECTION. OTHERWISE, UTAH WILL REMAIN UNDER NORTHWESTERLY FLOW
THROUGH TOMORROW AS HIGH PRESSURE BUILDS UPSTREAM.
THE STABLE AIRMASS WILL MAINTAIN INVERSION CONDITIONS ACROSS THE
EASTERN VALLEYS. FAIRLY EXTENSIVE LOW STRATUS REMAIN IN PLACE THERE
CURRENTLY, AND THE INCREASING NORTHWEST WINDS ALOFT TONIGHT ARE NOT
EXPECTED TO SURFACE EXCEPT POSSIBLY IN THE IMMEDIATELY DOWNSLOPE
REGIONS. AS SUCH, EXPECT STRATUS TO CONTINUE THROUGH AT LEAST
TOMORROW, WITH SOME PATCHY FOG DURING THE NIGHTTIME AND MORNING
HOURS.
THE NEXT TROUGH WILL MOVE QUICKLY ACROSS THE AREA ON FRIDAY,
BRINGING ANOTHER ROUND OF PRECIPITATION TO NORTHERN UTAH. THE AIRMASS
WILL REMAIN RELATIVELY MILD, AND AS SUCH, MOST VALLEYS EXCEPT THOSE
ALONG THE IDAHO BORDER ARE EXPECTED TO SEE MOSTLY RAIN ONCE AGAIN.
LONG TERM (AFTER 12Z SATURDAY)
BRIEF RIDGING WILL SHIFT ACROSS
THE REGION FOR THE FIRST PART OF THE LONG TERM FORECAST PERIOD.
PERSISTENT INVERSIONS MAY CONTINUE ACROSS THE EASTERN VALLEYS INTO
SATURDAY AND POTENTIALLY SUNDAY. THIS WILL LIKELY SUPPRESS
TEMPERATURES IN THESE AREAS.
A SOMEWHAT DISORGANIZED SHORTWAVE...LIKELY IN THE PROCESS OF
SPLITTING...WILL MOVE ACROSS THE REGION SUNDAY AFTERNOON INTO
MONDAY. CURRENT MODEL TRENDS WOULD BRING THE MAIN AREA OF
PRECIPITATION ACROSS THE VALLEYS LATE SUNDAY INTO EARLY MONDAY.
PROFILES ARE LARGELY SUPPORTIVE OF RAIN OR RAIN MIXED WITH SNOW AT
ONSET, GRADUALLY CHANGING TO SNOW BY MONDAY MORNING. ACCUMULATIONS
WILL BE POSSIBLE FOR MOST OF THE STATE. NORTHWEST FLOW WILL REMAIN
IN THE WAKE OF THIS SYSTEM. SEVERAL SYSTEMS EMBEDDED IN THIS FLOW
MAY CONTINUE THE THREAT OF SHOWERS THROUGH MIDWEEK.
AVIATION
THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGH THE
EVENING WITH CIGS AROUND 6000 FEET AGL. LIGHT NORTHWEST WINDS ARE
EXPECTED TO SHIFT TO THE SOUTHEAST BETWEEN 03Z AND 05Z.
SLC WATCHES/WARNINGS/ADVISORIES
UT...NONE.
WY...NONE.
CHENG/KRUSE/TRAPHAGAN
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
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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