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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Thursday
• 
• High: 54 °
• Low: 37 °
• Partly Cloudy

• Friday
• 
• High: 68 °
• Low: 41 °
• Chance of T-Storms

• Saturday
• 
• High: 57 °
• Low: 34 °
• Chance of T-Storms

• Sunday
• 
• High: 52 °
• Low: 36 °
• Partly Cloudy

• Monday
• 
• High: 66 °
• Low: 39 °
• Clear

Area forecast discussion...updated aviation section 
National Weather Service Salt Lake City Utah 
1037 PM MDT Wednesday may 23 2012 


Synopsis...a much cooler airmass will remain in place through 
tomorrow. A fairly moist Pacific storm is expected to cross the 
Great Basin late Friday into Saturday...with a drying trend 
expected for the latter half of the Holiday weekend. 






&& 


Discussion...the broad trough gradually carving out over western 
Continental U.S. Will continue to push additional cool/stable air into the Great 
Basin through Thursday. The developing upper low sliding southeast 
out of the Gulf of Alaska and into the Pacific northwest Thursday 
will continue south into California for Friday/Friday night. The 
latest versions of the GFS/European model (ecmwf) remain remarkably similar in 
timing and intensity of this feature...even as it ejects northeast 
through the basin early this weekend. 


The first major issue with this developing storm will be the winds 
on Friday. The deep and rather strong southerly flow ahead of the 
low along the likelihood of surface cyclogenesis across western 
Utah will create ideal conditions for strong winds for 
southern/western Utah Friday afternoon/evening. Will probably see 
wind highlights entering the forecast over the next couple of 
forecast cycles...with a high wind watch a distinct possibility 
for Friday. 


Precipitation will enter the picture late Friday afternoon/night as the 
upper low begins to lift northeast through the western Great 
Basin. Dynamic lift along with substantial cold air aloft and 
more than adequate deep layer moisture should produce a fairly 
broad area of precipitation into Saturday. The heaviest precipitation will 
likely stay in close proximity to the upper lows track across 
northwest Utah. Snow-levels will be falling as the low moves 
through...though at this time it looks like accumulations in the 
high country will remain on the low side. Southern/eastern Utah 
will receive what looks to be a brief convective event along the 
front as it moves east-northeast with the upper low on Saturday. 


The latter half of the Memorial Day weekend will likely be 
salvaged as the low lifts quickly away from the area Saturday 
night. The lingering shallow instability in the wake of the exiting 
system could generate some weak convection over the higher terrain 
Sunday afternoon. Significantly drier/warmer air ushered in on a 
southerly flow aloft will bring a warming trend to the state early 
next week. 


&& 


Aviation.../updated to mention thunder/...VFR conditions will 
continue at the slc terminal through Thursday morning. Ceilings 
around 7-8 kft will dissipate around 05-06z with the threat of 
showers/isolated thunderstorms and erratic surface winds ending. 
Generally light southeast drainage will develop around 08-09z. 


&& 


Fire weather...the cold front across extreme southern Utah will 
likely turn back to the north Thursday/Friday. Cooler temperatures and 
somewhat higher relative humidity values will exist north of the frontal 
boundary...with continued very dry and warm conditions to the 
south. Critical fire weather conditions will form again across 
portions of extreme southern Utah Thursday. Severe fore conditions 
are expected Friday and very windy and dry conditions will exist 
ahead of approaching Pacific trough scheduled to arrive early in 
the coming weekend. Numerous red flag warnings will remain in 
effect at various times across most valley zones of southern and 
eastern Utah through Friday. 


Once the Pacific trough lifts northeast out of the area late 
Saturday...winds will diminish allowing red flag conditions to 
temporarily abate. A chance for wetting rains will exist across 
northern Utah late Friday/Saturday remains with generally lighter 
winds for Sunday and Monday. 


&& 


Slc watches/warnings/advisories... 
Utah...red flag warning from 9 am to 10 PM MDT Friday below 6500 
feet for utz489-494. 


Hard freeze warning until 9 am MDT Thursday for utz006. 


Red flag warning from 9 am to 10 PM MDT Friday below 4500 feet 
for utz492. 


Red flag warning from 9 am to 10 PM MDT Friday for utz495-497. 


Red flag warning from noon Thursday to 10 PM MDT Friday for 
utz498. 


Wyoming...none. 


&& 


$$ 


Conger 


For more information from National oceanic and atmospheric administration/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)