FXUS65 KSLC 091701
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1001 AM MST WED DEC 9 2009
.SYNOPSIS...A WEAK WEATHER DISTURBANCE MOVING EAST THROUGH
NORTHERN UTAH WILL EXIT THE STATE THIS AFTERNOON. A VERY COLD
NORTHERLY FLOW ALOFT WILL ENTER THE NORTHERN GREAT BASIN TONIGHT...
MAINTAINING THE EXISTING VERY COLD TEMPERATURES THROUGH THE
BALANCE OF THE WEEK.
&&
.DISCUSSION...THE CYCLONIC N-NW FLOW ACROSS THE NRN ROCKIES/GREAT BASIN
THIS MORNING CONTINUES TO POUR VERY COLD SOUTHWARD INTO THE
FORECAST AREA. A WEAK SHORTWAVE EMBEDDED WITHIN THE FLOW OVER FAR
NRN UTAH PRODUCING LIGHT SNOW ALONG THE NRN WASATCH FRONT/MOUNTAINS
THIS MORNING. SOME ENHANCEMENT IN THE SNOWFALL HAS BEEN NOTED IN
THE OGDEN AREA WHERE THE RELATIVELY WARM LAKE SURFACE LIKELY
CREATING SHALLOW INSTABILITY EAST OF THE GSL. RAPID WARMING ALOFT
SHOULD BRING AN END TO ANY PRECIP EARLY THIS AFTERNOON.
VERY COLD TEMPERATURES WILL REMAIN OVER THE AREA THROUGH THE
BALANCE OF THE WEEK. DEEP SNOW COVER...POOR MIXING AND GENERALLY
CLEAR SKIES WILL ALLOW READINGS TO DIP TO RECORD LEVELS IN MANY
AREAS TONIGHT. STEADY WARMING ALOFT THE NEXT COUPLE OF DAYS WILL
BOOST TEMPS IN THE MOUNTAINS...BUT STABLE CONDITIONS AND LIGHT
WINDS WILL KEEP VALLEY LOCATIONS WELL BELOW NORMAL HEADING INTO
THE WEEKEND.
SOLID WESTERLIES OFF THE PACIFIC WILL IMPORT MOISTURE AND MODERATE
TEMPS SOMEWHAT THIS WEEKEND. MOIST OVERRUNNING COULD GENERATE SOME
LIGHT SNOW IN THE VALLEYS WHERE COLD AIR REMAINS TRAPPED. EMBEDDED
DISTURBANCES IN THE WESTERLIES WILL ENHANCE PRECIP...WITH SUNDAYS
DISTURBANCE OFFERING THE BEST THREAT FOR SIGNIFICANT SNOW ACCUMULATIONS.
NOT PLANNING ANY UPDATES RIGHT NOW...BUT WILL LIKELY LOWER LOWS
TONIGHT EVEN FURTHER IN THE AFTERNOON PACKAGE.
&&
.AVIATION...WINDS AT THE SLC TERMINAL ARE EXPECTED TO SHIFT TO THE
NORTHWEST BETWEEN 18Z AND 20Z...WITH A 15 PERCENT CHANCE THAT THEY
WILL SHIFT AS LATE AS 21Z. MVFR CONDITIONS WILL PREVAIL...WITH
CEILINGS HOVERING AROUND 6000FT THROUGH 17Z TO 19Z.
&&
.SLC WATCHES/WARNINGS/ADVISORIES...
UT...NONE.
WY...NONE.
&&
$$
PUBLIC...CONGER
AVIATION...HOSENFELD
FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
