Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 231622
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1022 AM MDT THU APR 23 2015

.SYNOPSIS...AN UPPER LEVEL WEATHER DISTURBANCE CROSSING THE NORTHERN
ROCKIES WILL BRING A WEAK COLD FRONT THROUGH THE AREA TODAY. A COLD
AND ENERGETIC PACIFIC STORM SYSTEM WILL IMPACT THE REGION THIS
WEEKEND. HIGH PRESSURE WILL RETURN FOR EARLY NEXT WEEK.

&&

.DISCUSSION...WEAKLY DEFINED SHORTWAVE ENERGY CONTINUES TO ROTATE
THROUGH UTAH AND SOUTHWEST WYOMING THIS MORNING FROM THE SOUTHERN
CALIFORNIA LOW. SEEING SOME LIGHT SHOWERS OVER SOUTHWEST UTAH IN
ASSOCIATION WITH THAT FEATURE. ANOTHER WEAK FEATURE IS MOVING
THROUGH IDAHO AT THIS TIME AND SOME ADDITIONAL SHOWERS CONTINUE
ALONG THE UT/ID BORDER WITH THE BOUNDARY ASSOCIATED WITH THAT
SYSTEM THAT IS PROGGED TO WEAKEN THIS AFTERNOON.

SHOWERS AND THUNDERSTORMS WILL LIGHT UP OVER THE TERRAIN THIS
AFTERNOON GIVEN THE MOISTURE AND INSTABILITY HANGING AROUND. AM A
BIT CONCERNED THAT THE LACK OF A BETTER DEFINED FEATURE WILL LIMIT
COVERAGE COMPARED TO YESTERDAY...BUT SCATTERED COVERAGE COVERS THE
THREAT WELL AT THIS TIME. GIVEN THE RELATIVELY DRY LOWER
LEVELS...MAIN THREAT WITH CELLS THAT DEVELOP IS THE POTENTIAL FOR
GUSTY WINDS. INCREASING CLOUDS WILL LIMIT WARMING A BIT THIS
AFTERNOON...THOUGH MAXES SHOULD REMAIN IN EXCESS OF 5F ABOVE
CLIMO.

THE CALIFORNIA SYSTEM WILL TRACK ACROSS SOUTHERN ARIZONA AND NEW
MEXICO TOMORROW AS A STRONGER AND BETTER DEFINED PACIFIC NORTHWEST
SYSTEM MAKES ITS APPROACH. A WAVE EJECTING OUT AHEAD OF IT WILL
MOVE A COLD FRONT INTO NORTHERN UTAH TOMORROW
AFTERNOON...INCREASING MOISTURE AND INSTABILITY AND CAUSING AN
INCREASE IN COVERAGE OF AFTERNOON CONVECTION. WITH STRONGER
FLOW...CELLS WILL BE MORE LIKELY TO DRIFT OFF THE TERRAIN. THIS
BOUNDARY IS PROGGED TO STALL OVER CENTRAL UTAH FRIDAY
NIGHT/SATURDAY MORNING.

THE MAIN SYSTEM IS EXPECTED TO MOVE ACROSS THE FORECAST AREA
SATURDAY AFTERNOON THROUGH SUNDAY...BRINGING A GOOD FRONT THROUGH
SATURDAY NIGHT/EARLY SUNDAY THAT WILL BE A FOCUS FOR
PRECIPITATION. THIS LOOKS TO BE A MOUNTAIN SNOW/VALLEY RAIN
EVENT...THOUGH 700 MB TEMPS FALL TO THE -6C TO -8C RANGE BY SUNDAY
AFTERNOON. IT SEEMS MOST VALLEY PRECIP WILL BE DONE BY THIS
TIME...HOWEVER. PRECIPITATION TAPERS OFF SUNDAY AFTERNOON AND
EVENING AS THE MAIN TROUGH DIVES SOUTH INTO ARIZONA AND NEW MEXICO
AND THEN QUICKLY MOVES EAST. HIGH PRESSURE IS EXPECTED TO RETURN
BEHIND THE EXITING SYSTEM.

NO UPDATES EXPECTED TO THE FORECAST THIS MORNING.


&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGH THE
TAF PERIOD. SOUTHEAST WINDS WILL SHIFT TO NORTHWEST BETWEEN 19 AND
20Z WITH A 30 PERCENT CHANCE OF SWITCHING BETWEEN 18 AND 19Z. THERE
IS A 10 PERCENT CHANCE ISOLATED SHOWERS OVER THE HIGHER TERRAIN
COULD SEND AN OUTFLOW WITH GUSTS TO 30 MPH ACROSS THE TERMINAL
BETWEEN 20Z AND 02Z.

&&

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

$$

PUBLIC...TRAPHAGAN
AVIATION...STRUTHWOLF

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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