Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 010308
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
908 PM MDT TUE SEP 30 2014

.SYNOPSIS...A COOL PACIFIC STORM WILL MOVE THROUGH THE AREA
TONIGHT THROUGH WEDNESDAY. HIGH PRESSURE WILL BUILD OVER THE AREA
THURSDAY THROUGH AT LEAST EARLY NEXT WEEK.

&&

.DISCUSSION...A LONG WAVE TROF REMAINS OVER THE WESTERN US THIS
EVE WITH A COOL SHORT WAVE DROPPING INTO IT. THIS WAVE IS OVER ERN
OR/WRN ID AT THIS TIME AND WILL CROSS NRN UT OVERNIGHT THRU ABOUT
MIDDAY WED BEFORE MOVING OFF TO THE EAST.

THE ASSOCIATED COLD FRONT HAS CROSSED ABOUT THE NRN 1/3 OF THE
STATE AND IS ACCOMPANIED BY A DISORGANIZED BAND OF SCATTERED
SHOWERS. THESE HAVE SHIFTED OUT OF THE FAR NRN CWA AND WILL
CONTINUE TO SHIFT SOUTH OVERNIGHT AS THE FRONT ADVANCES THRU THE
CWA.

THE AIRMASS WITH THIS TROF IS ON THE COOL SIDE WITH TEMPS FALLING
TO -4C AT 700 MB ACROSS MOST OF NRN UT WITH A FEW POCKETS AS LOW
AS -5C BY 18Z WED. HOWEVER...THIS COLDER AIR IS WELL UPSTREAM OF
THE BAND OF SHOWERS AND SNOW LEVELS WILL REMAIN FAIRLY HIGH WITH
THESE AS THEY PROGRESS SWD. SO DONT EXPECT ANY IMPACT FOR ANY OF
THE MOUNTAIN PASSES OVERNIGHT.

THERE COULD BE INSTABILITY SHOWERS IN THE COLD POOL OVER NRN UT
TOMORROW WITH SNOW LEVELS DOWN TO 6500 FEET OR SO BUT THESE WOULD
BE SCATTERED AND BRIEF AND ONCE AGAIN EXPECT LITTLE IF ANY IMPACT
ON TRAVEL.

A FAIRLY TIGHT NWLY PRESSURE GRADIENT SETS UP ACROSS THE CWA BY
MID MORNING TOMORROW AND TIGHTENS ACROSS THE SOUTH AND EAST THRU
THE AFTN INTO TOMORROW NIGHT. THIS SHOULD GENERATE GUSTY NWLY
WINDS IN THE NORMALLY FAVORED DOWNSLOPE AREAS OF SRN AND ERN UT
BUT UPPER SUPPORT IS NOT THAT STRONG THRU THE AFTN SO DO NOT
EXPECT WINDS TO GET TOO STRONG. THE UPPER SUPPORT GETS STRONGER
ACROSS SWRN UT AFT 00Z THU AND THE SURFACE GRADIENT STAYS TIGHT
THRU THE EVE SO SPEEDS COULD REACH ADVISORY LEVELS BELOW CANYONS
AND GAPS IN WASHINGTON CO. WINDS SHOULD DROP OFF IN ALL AREAS BY
THU MORNING.

AN UPPER RIDGE IS FORECAST TO STRENGTHEN OVER THE WEST COAST
STATES THU THRU THE WEEKEND BRINGING DRY CONDITIONS AND A WARMING
TREND TO THE CWA.

UPDATED EARLIER TO TRIM POPS BACK ACROSS THE FAR NORTH FOR THE
NIGHT AND ADJUSTED THE SOUTHWARD TIMING OF THE SHOWERS AS WELL.
TWEAKED WINDS AND SKY A BIT FOR TONIGHT TOO. NO ADDITIONAL UPDATES
PLANNED.

&&

.AVIATION...WINDS AT THE SLC TERMINAL WILL BE MOSTLY NORTHERLY
THROUGH THE NIGHT. PASSING SHOWERS COULD BRING VARIABLE WINDS AT
TIMES THROUGH ABOUT 08Z. WINDS COULD BECOME LIGHT AND VARIABLE AT
TIMES AGAIN BETWEEN ABOUT 11-14Z. VFR CONDITIONS WILL PREVAIL.
CIGS NEAR 7000 FT ARE POSSIBLE THRU ABOUT 08Z IF A SHOWER CROSSES
THE AIRFIELD.

&&

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

$$

WILENSKY

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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