Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 281529
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
929 AM MDT SUN SEP 28 2014

.SYNOPSIS...A COOL MOIST UPPER LOW WILL SLOWLY CROSS THE EASTERN
GREAT BASIN THROUGH MONDAY. ANOTHER WEAKER SYSTEM WILL CROSS
NORTHERN PORTIONS OF THE AREA TUESDAY NIGHT INTO WEDNESDAY. A
DRIER NORTHWEST FLOW WILL DEVELOP FOR THE LATTER PART OF THE WEEK.


&&

.DISCUSSION...BROAD PACIFIC LOW IS CENTERED OVER EASTERN NEVADA
THIS MORNING. SHORTWAVES ROTATING ON THE FRONT SIDE OF THE SYSTEM
ARE KEEPING A MOIST AND UNSTABLE AIRMASS OVER UTAH AND SOUTHWEST
WYOMING. THE HEAVIEST PRECIPITATION HAS MOVED PRIMARILY EAST OF
THE AREA BUT STILL SEEING SOME SHOWERS OVER NORTHEASTERN PORTIONS
OF THE CWA. THE LOW WILL CONTINUE EAST THIS AFTERNOON AND THIS
EVENING...BRINGING SOME ADDITIONAL COLD POOL INSTABILITY AND
FAVORABLE JET DYNAMICS WHICH WILL ALLOW SCATTERED CONVECTION TO
DEVELOP LATER TODAY.

UNDER THE INFLUENCE OF THE TROUGH...AND UNSEASONABLY COLD AIRMASS
HAS MOVED IN WITH 700 MB TEMPS RUNNING FROM AROUND +5C OVER
EASTERN UTAH TO NEAR 0C OVER FAR WESTERN UTAH. THIS WILL RESULT IN
MAXES IN EXCESS OF 10F BELOW SEASONAL NORMS TODAY. THE TROUGH WILL
CONTINUE TO CROSS THE STATE TOMORROW...WITH THE LAST TRAILING WAVE
MOVING OUT MONDAY NIGHT/TUESDAY MORNING. THUS...THE THREAT OF
CONVECTION REMAINS...ESPECIALLY OVER NORTHEASTERN UTAH.

A SECOND TROUGH IS STILL FORECAST TO MOVE ACROSS NORTHERN UTAH
TUESDAY NIGHT AND WEDNESDAY...BRINGING A REINFORCING SHOT OF COLD
AIR AND SOME ADDITIONAL PRECIPITATION BEFORE A DRIER NORTHWEST
FLOW MOVES IN FOR THE LATTER PART OF THE WEEK.

UPDATED THE FORECAST EARLIER TO ADJUST SKY AND POP GRIDS FOR
CURRENT TRENDS. NO ADDITIONAL UPDATES PLANNED.

&&

.AVIATION...VFR CONDITIONS WILL PREVAIL AT THE SLC TERMINAL THROUGH
THE TAF PERIOD WITH CIGS REMAINING ABOVE 7K FT AGL. PASSING SHOWERS
COULD OCCASIONALLY DROP CIGS TO 6000 FT OR LOWER THROUGH ABOUT 03Z
THIS EVE. WINDS WILL PRIMARILY BE OUT OF THE SOUTHEAST THROUGH THIS
MORNING THEN SHIFT TO THE NORTHWEST THIS AFTERNOON AFTER 20Z.
ERRATIC GUSTY WINDS ARE ALSO POSSIBLE NEAR ANY SHOWERS.

&&

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

$$

PUBLIC...TRAPHAGAN
AVIATION...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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