Area Forecast Discussion
Issued by NWS Salt Lake City, UT
Issued by NWS Salt Lake City, UT
036 FXUS65 KSLC 140941 AFDSLC Area Forecast Discussion National Weather Service Salt Lake City UT 341 AM MDT Sun Sep 14 2025 .SYNOPSIS...High pressure will bring dry and seasonable conditions across Utah and southwest Wyoming today. A Pacific Northwest storm system will graze northern Utah Sunday night into Monday, bringing cooler temperatures and a chance of light showers. Drier conditions are expected to prevail thereafter. && .SHORT TERM (Through 12Z/6AM Tuesday)...Seeing clear skies across Utah and southwest Wyoming this morning with high pressure centered over the area. The trough that has been impacting the area over the past few days is finally exiting to the east as another trough moves onshore over the Pacific Northwest. Conditions will stay dry during the day today with maxes running near to a few degrees below normal for this time of year. The Pacific Northwest storm system will quickly slide into Idaho this afternoon before grazing northern Utah tonight into Monday. The primarily impact from this will be to bring a frontal boundary into northern Utah that will bring a 5-7F decrease in maxes for the northern third or so of the area for Monday. Though mostly dry, a few associated showers will be possible, primarily for areas near the Utah/Idaho border. .LONG TERM (After 12Z/6AM Tuesday)...A shortwave ejecting to the east will leave conditions dry on Tuesday with temperatures near normal along with temperatures a few degrees above normal further south. A ridge builds into the area on the heels of this shortwave with temperatures gradually warming a few degrees above normal Wednesday and Thursday. Temperatures across lower Washington county will be in the upper 90s to near 100 degrees. The ridge starts to break down a bit late in the week with southerly flow advecting moisture back into the area. This will help to develop diurnal convection through the weekend. A trough off the west coast will bring upper level diffluence to provide more lift for convection across the area on Saturday. ~56% of ensemble members are on the wetter side of the solution, while the remaining 44% of members are on the drier side of the solution space. Additionally, guidance does hint at some shortwaves ejected out ahead of the parent trough over the weekend that could enhance lift and promote more convection. This pattern will favor temperatures near normal given the absence of any cooler continental airmasses. && .AVIATION...KSLC...VFR conditions will persist for the KSLC terminal through the period. Dry conditions with a few mid level clouds will continue with light and diurnally driven winds. .REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will persist for the entire airspace through the period. Conditions will remain dry with a few mid level clouds and light diurnally driven winds. && .FIRE WEATHER...Weak high pressure has moved over Utah this morning in between the exiting Pacific storm system and a Pacific Northwest storm system that is moving onshore. As a result, conditions will be dry today with temperatures near seasonal normals. The Pacific Northwest storm system will graze northern Utah late Sunday into Monday, bringing a chance of showers to northern Utah and bring a slight cooldown in temperatures. Drier conditions will then prevail for much of the week behind the exiting storm system, with temperatures staying near or just below normal for this time of year. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && $$ SHORT TERM/FIRE WEATHER...Traphagan LONG TERM/AVIATION...Mahan For more information from NOAA`s National Weather Service visit... http://weather.gov/saltlakecity