FXUS65 KSLC 251633
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
933 AM MST FRI DEC 25 2009

.SYNOPSIS...A COLD NORTHERLY FLOW WILL CONTINUE ACROSS UTAH THROUGH 
EARLY SATURDAY. A SERIES OF WEAK DISTURBANCES WILL MOVE ACROSS THE 
GREAT BASIN THROUGH MUCH OF NEXT WEEK. 

&&

.DISCUSSION...A HIGH AMPLITUDE RIDGE CONTINUES TO BUILD OVER THE 
WEST COAST THIS MORNING WHILE A LARGE CLOSED LOW REMAINS SITUATED 
OVER THE CENTRAL CONUS. MEANWHILE...UTAH REMAINS IN A COLD NORTHERLY 
FLOW IN BETWEEN THESE FEATURES. A VORT LOBE RIDING DOWN THE WESTERN 
PERIPHERY OF THE LOW IN ASSOCIATION WITH A JET STREAK NOSING INTO 
WESTERN UTAH HAS PUSHED A STRATUS DECK INTO NORTHEAST UTAH AND 
SOUTHWEST WYOMING. WEAK LIFT ASSOCIATED WITH THIS WAVE COULD RESULT 
IN LIGHT SNOW ACROSS THE NORTHEAST ZONES TODAY. OTHERWISE...THE 
CLOUDS...SNOW COVER...WEAK MIXING AND SLIGHTLY COOLER AIR SPREADING 
INTO THE AREA WILL RESULT IN TEMPERATURES WELL BELOW NORMAL TODAY.

BESIDES THE WEATHER ASSOCIATED WITH THE VORT LOBE TODAY...DENSE FOG 
DEVELOPED OVERNIGHT IN THE SANPETE AND SEVIER VALLEYS. THIS FOG IS 
EXPECTED TO REMAIN IN PLACE THROUGH LATE MORNING BEFORE DISSIPATING. 
THE DENSE FOG ADVISORY HAS BEEN EXTENDED THROUGH 11 AM.

HIGH PRESSURE WILL CLOSE OFF OVER ALBERTA OVER THE WEEKEND...LEAVING 
UTAH UNDER A NEAR-ZONAL FLOW. A COUPLE OF WEAK SHORTWAVES WILL 
SLOWLY MOVE ACROSS THE AREA...RESULTING IN INCREASED CLOUD COVER 
THROUGH EARLY NEXT WEEK...BUT LIMITED MOISTURE AND DYNAMICS WILL 
HINDER THE DEVELOPMENT OF ANY SIGNIFICANT PRECIPITATION. A MORE 
PROGRESSIVE PATTERN WILL DEVELOP BY MIDWEEK WITH WEAK SHORTWAVE 
TROUGHS TRANSITING THROUGH THE AREA IN INCREASING NORTHWEST FLOW. 
HOWEVER...SIGNIFICANT MODEL SPREAD EXISTS WITH REGARDS TO THE 
TRACK/EVOLUTION OF THE INDIVIDUAL WAVES AT THIS TIME.

HAVE UPDATED FORECASTS MAINLY FOR WEATHER FOR THE REMAINDER OF THE 
DAY.
 
&&

.AVIATION...PREDOMINANT VFR CONDITIONS ARE EXPECTED AT THE SLC 
TERMINAL THROUGHOUT THE DAY WITH LIGHT NORTHERLY SURFACE WINDS. CIGS 
TO GENERALLY REMAIN IN THE 7500-8500 FT RANGE WITH A 20 PERCENT 
CHANCE CIGS DROP BELOW 4KFT WITH OCCASIONAL FLURRIES BETWEEN 
18Z-00Z. 

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...DENSE FOG ADVISORY UNTIL 11 AM TODAY FOR UTZ014.

WY...NONE.

&&

$$

PUBLIC...CHENG
AVIATION...SEAMAN

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