


Area Forecast Discussion
Issued by NWS Salt Lake City, UT
Issued by NWS Salt Lake City, UT
606 FXUS65 KSLC 072050 AFDSLC Area Forecast Discussion National Weather Service Salt Lake City UT 250 PM MDT Mon Jul 7 2025 .SYNOPSIS...High pressure continues to build over the southwest through midweek. Dry conditions and increasingly hot temperatures will develop by midweek. Hot, dry, and windy conditions may yield some fire weather danger Wednesday across portions of central and southern Utah. On Thursday, a weakening trough will clip the area bringing temperatures back to near normal through Friday, though unseasonably hot temperatures will return by the weekend. && .SHORT TERM (Through 12Z/6AM Wednesday)...Currently, skies remain mostly clear across the majority of the CWA with the exception of orographic lift occurring over our typical mountain spots. An isolated shower or two is possible across our central and southern high terrain as well as the Uintas this afternoon, though ridging aloft resulting in strong subsidence with dry air pushing into the area should greatly limit coverage this afternoon with PoPs limited to 10%. Ridging will continue to build tomorrow and with the increase in heights, we are expected to see another day with temperatures 5-10 degrees above normal across the majority of the forecast area. Lower elevations will see temperatures make a run for the triple digits, including the majority of the Wasatch Front. Additionally, lower Washington county will see temperatures break into the mid 100s, perhaps making a run at 110 near St. George. Conditions are expected to remain quite dry once again as stronger subsidence takes hold which should serve to limit even orographically forced showers other than light cumulus forming along ridges. Be sure to drink plenty of water and dress accordingly if outside tomorrow! .LONG TERM (After 12Z/6AM Wednesday), Issued 325 AM MDT... A shortwave passing through northern Utah on Wednesday will bring the only (small) chance for convection to the area through the period. After this passage, high pressure becomes centered over southern California. This positioning of the summer ridge is not conducive for a monsoon moisture tap across Utah. However, the silver lining in this location of the ridge is that it keeps a light westerly/northerly flow aloft across the area that will help to limit how hot temperatures get. Southerly flow will increase ahead of the approaching shortwave. This will result in southerly winds gusting in the 20-30 mph range across much of the area. These gusty winds will pair with RH values in the upper single digits to low teens. Mid and upper level moisture will advect into the region as this shortwave passes to the north. As such, there remains a small chance for some convection on Wednesday afternoon/evening. Forecast soundings with inverted V profiles would suggest very little QPF is possible across valleys, but there will exist the threat for some microburst winds. Additionally, Wednesday will most likely be the hottest day of the 7 day period as temperatures drop back near normal as northwest flow becomes established behind the shortwave with high pressure centered over southern California. && .AVIATION...KSLC...Weather remains quiet with VFR conditions prevailing, and a few daytime cumulus developing around 10 kft. Wind magnitudes generally remain less than 15 kts, following a typical diurnal pattern with NW winds becoming SSE between ~03-05Z Tue, and back NW ~18-20Z thereafter. .REST OF UTAH AND SOUTHWEST WYOMING...TAF period once again expected to remain VFR, with some SCT cumulus developing off area terrain along with an isolated shower or two. Area terminals will also see a warming trend continue. Wind directions expected to follow a typical diurnal cycle, with light magnitudes generally less than 15 kts, and a few gusts to around 20-25 kts at more exposed or typically gusty terminals. && .FIRE WEATHER...High pressure extending from the Desert Southwest into the Four Corners region will result in a continuation of hot and dry conditions across Utah. Despite the strong ridge, just enough moisture remains present for the development of one or two widely isolated showers off of the high terrain during the daytime. Some gusty erratic outflow winds would be possible in the vicinity of any activity that does form. Aside from the high pressure, an area of low pressure remains semi-stationary off the California coast Monday and Tuesday, resulting in modest enhancement to southwesterly flow atop the region, and in turn some gusts in the 15-30 mph range. As such, will see some locally elevated to critical fire weather conditions for brief periods when the wind picks up. The area of low pressure eventually starts to come ashore, pushing through the Great Basin Wednesday. Ahead of an associated frontal boundary, this will result in the enhancement of low level winds through the day. This will yield afternoon southwesterly wind gusts pushing more into the 25-35 mph, which in combination with the already very low relative humidity values will result in an expansion of critical fire weather conditions. As such, have issued a Fire Weather Watch from western to central to southern Utah. Aside from the gusty conditions, forecast models continue to suggest some isolated to scattered high based convection may develop off the high terrain during the day, subsequently drifting east. Gusty erratic outflow winds would be the primary threat with anything that does develop. The front is then expected to pass late Wednesday evening overnight into early Thursday. A few showers may accompany the front, but the passage is largely expected to be dry, more marked by a wind shift more west to northwesterly. Winds will relax some thereafter, with slightly cooler temperatures expected across central and northern Utah Thursday and Friday. Conditions once again warm thereafter into the weekend. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...Fire Weather Watch from Wednesday afternoon through Wednesday evening for UTZ492-493-495>498. WY...None. && $$ SHORT TERM...Worster LONG TERM...Mahan AVIATION...Warthen FIRE WEATHER...Warthen For more information from NOAA`s National Weather Service visit... http://weather.gov/saltlakecity