FXUS65 KSLC 231707
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1007 AM MST WED DEC 23 2009

.SYNOPSIS...THE LATEST STORM HAS MOVED EAST OF THE AREA. LOW LEVEL
MOISTURE EMBEDDED IN A NORTHERLY FLOW WILL MAINTAIN LOW CLOUDS
NEAR AND UPWIND OF THE TERRAIN TODAY. AN UPPER RIDGE WILL BUILD
INTO THE AREA THE NEXT FEW DAYS.

&&

.DISCUSSION...COLD UPPER LOW THAT BROUGHT SNOW TO THE AREA THE
PAST 24 HOURS HAS MOVED EAST OF THE AREA. LOW LEVEL MOISTURE IS
BEING PUSHED INTO THE TERRAIN BY A NORTH TO NORTHWEST LOW LEVEL
FLOW. THE RESULT IS WIDESPREAD LOW CLOUDS/STRATUS AND SNOW SHOWERS
OVER AND UPSTREAM OF TERRAIN WHERE THIS FLOW PRODUCES UPSLOPE.
ELSEWHERE SKIES ARE CLEARING.

SNOWFALL FROM THE AFOREMENTIONED LOW CLOUDS LIKELY TO BE VERY
LIGHT AND HAVE OPTED TO CANCEL ALL REMAINING WARNINGS AND
ADVISORIES.

SOME GUSTY WINDS IN DOWNSLOPE AND GAP AREAS OF WASHINGTON COUNTY
BUT ISOLATED ENOUGH THAT WIND ADVISORY NOT JUSTIFIED.

MAIN FORECAST PROBLEM TONIGHT AND THURSDAY WILL BE THE POTENTIAL
DEVELOPMENT OF VALLEY FOG...ESPECIALLY IN THE NORTHERN VALLEYS
WHERE THE RECENT STORM REALLY NEVER SUCCEEDED IN COMPLETELY
REPLACING THE STABLE AIRMASS. 12Z NAM BUFR SOUNDINGS SHOW
SATURATION AT THE SURFACE TONIGHT. WILL WAIT FOR OTHER GUIDANCE
BEFORE DECIDING HOW TO HANDLE THE FOG.

&&

.AVIATION...CEILINGS WILL STRUGGLE TO IMPROVE BEYOND MVFR THROUGH 
THE MORNING HOURS...MOST LIKELY SCATTERING DURING THE MID TO LATE 
AFTERNOON HOURS. WITH LOW LEVEL MOISTURE REMAINING IN THE 
AREA...WILL HAVE TO WATCH FOR THE FOG POTENTIAL TONIGHT. FOG 
POTENTIAL WILL HINGE ON HOW MUCH CLEARING CAN TAKE PLACE BY 
EVENING. SURFACE WIND DIRECTION SHOULD REMAIN LIGHT OUT OF THE 
NORTHWEST THROUGH THE DAY...BEFORE BECOMING VARIABLE DURING THE 
EVENING. SOUTHEASTERLY DRAINAGE WINDS DEVELOPS LATER TONIGHT.

&&

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

&&

$$

PUBLIC...DUNN
AVIATION...ROGOWSKI

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)