Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 271713
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1012 AM MST TUE JAN 27 2015

.SYNOPSIS...A STORM SYSTEM WILL SLOWLY CROSS THE REGION THROUGH
EARLY WEDNESDAY. ANOTHER SYSTEM WILL DEVELOP DURING THE LATTER
PORTION OF THE WEEK ACROSS THE DESERT SOUTHWEST...AND MAY IMPACT
PORTIONS OF CENTRAL AND SOUTHERN UT.

&&

.DISCUSSION...A WEAKENING UPPER LOW CURRENTLY CENTERED OVER THE
CENTRAL SIERRA NEVADA WILL CONTINUE TO EJECT ACROSS THE GREAT BASIN
TODAY. A BAND OF VALLEY RAIN AND MOUNTAIN SNOW FIRED UP ALONG THE
700MB BOUNDARY AS IT LIFTED SOUTH TO NORTH OVERNIGHT...BUT THIS
BOUNDARY HAS SINCE BECOME MORE DIFFUSE...AND THE MOISTURE THAT WAS
SOURCED EARLIER IN THE STORMS EVOLUTION HAS NOW WRAPPED AROUND TO
THE NORTH OF THE LOW...WELL WEST OF UTAH. AS A
RESULT...PRECIPITATION BAND HAS BECOME MUCH MORE BROKEN UP NOW THAT
IT HAS REACHED NORTHERN UTAH. THIS IS CONSISTENT WITH LATEST MODELS
INCLUDING RAP/HRRR WHICH HAVE TRENDED LESS ENTHUSIASTIC WITH PRECIP
IN THEIR LATEST RUNS. WHILE SOME SPOTS ACROSS NORTHERN UTAH MAY
STILL SEE MEASURABLE PRECIPITATION TODAY...THIS WILL BE SPOTTY SO
HAVE DECIDED TO LOWER POPS FOR THIS AFTERNOON. ALSO TWEAKED SKY
COVER AND ADDED SOME WIND WORDING FOR WESTERN VALLEYS GIVEN A
SOUTHERLY GRADIENT COMBINED WITH 25-30KT H7 WINDS PER MODELS.

THE STORM WILL CONTINUE TO TRACK WEST TO EAST ACROSS NORTHERN UTAH
TONIGHT AS A WEAK OPEN WAVE. SHOWERS WILL CONTINUE OVER NORTHERN
UTAH AS A RESULT...MOSTLY OCCURRING LATE TONIGHT INTO TOMORROW
MORNING. HOWEVER...THE BULK OF THE MOISTURE WILL REMAIN ON THE
NORTHERN FRINGE OF THE STORM...THAT IS...OVER IDAHO. SNOW LEVELS
WILL FALL TO NEAR 6000FT SO ACCUMULATIONS...ALBEIT VERY LIGHT...MAY
REACH THE HIGHER VALLEYS OF NORTHERN UTAH AND ALSO SOUTHWEST WYOMING.

INVERSIONS NOT LIKELY TO BE BROKEN UP BY THIS STORM AS H7
TEMPERATURES ONLY FALL TO AROUND -4 TO -5C BUT SHOULD AS LEAST
WEAKEN. AFTERNOON MAXES TODAY WILL TREND SLIGHTLY COOLER TODAY AND
TOMORROW...MORE SIGNIFICANTLY OVER THE MOUNTAINS...BUT STILL REMAIN
QUITE MILD FOR THIS TIME OF YEAR.

&&

.AVIATION...VFR CONDITIONS ARE EXPECTED AT THE SLC TERMINAL
THROUGHOUT THE DAY. CIGS ARE EXPECTED TO LOWER TO AROUND 6000 FT AGL
BETWEEN 18Z AND 20Z WITH THE APPROACH OF A WEAK STORM SYSTEM. LIGHT
WINDS ARE EXPECTED TO INCREASE OUT OF THE SOUTHEAST BY EARLY
AFTERNOON.

$$


&&

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

$$

CHENG/TRAPHAGAN

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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