


Area Forecast Discussion
Issued by NWS Salt Lake City, UT
Issued by NWS Salt Lake City, UT
425 FXUS65 KSLC 141004 AFDSLC Area Forecast Discussion National Weather Service Salt Lake City UT 404 AM MDT Mon Jul 14 2025 .SYNOPSIS...Hot and mostly dry conditions continue this week, increasing moisture bringing an increasing threat of high based showers and storms by midweek. && .SHORT TERM (Through 12Z/6AM Wednesday)...High pressure remains over the Great Basin this morning, resulting in mostly clear skies over Utah and southwest Wyoming. Under the influence of the ridge, temperatures will average 5-10F above seasonal normals, similar to yesterday. Southwest Utah will see some modest warming, pushing highs in lower Washington county to around 110F with limited overnight recovery. Because of this, an Extreme Heat Warning is in effect for that portions of the area this afternoon and this evening. As a trough moves across the Pacific Northwest today and tomorrow and another weak tough approaches the California coast, the flow aloft will develop a more southerly direction, allowing some high based moisture to start to spread northward. This will result in the development of a few showers over the higher terrain over southern Utah, with gusty winds and dry lightning the primary threats with any storms that develop. By Tuesday, this high based moisture will be a bit more plentiful, with dynamics becoming more favorable with the approaching California trough providing some ejecting shortwave energy and the Pacific Northwest trough providing some more favorable jet support. Thus, coverage of showers and thunderstorms, still primarily high based, will be a bit higher, resulting in a higher threat of gusty microburst winds across the area. The increasing southerly flow will bring some increased fire danger to southern Utah. See the fire weather section of the AFD for more details. .LONG TERM (After 12Z/6AM Wednesday)...Ridging aloft remains over the area, although we should see some "relief" from the hot temperatures of Tuesday, if you can really call it that. Following the passage of an upper trough to our north, "cooler" air will filter into the region bringing temperatures to just below or normal for this time of year. Temperatures for the majority of our valleys will generally range from the lower 90s to mid 90s while lower Washington county will see temperatures in the low 100s. Modest moisture return is expected to persist through the long term period as an upper low develops and meanders over the Baja Peninsula and southern CA. This will result in PWATs generally ranging from around 0.5-0.7" across the majority of UT and southwest WY for the majority of the long term forecast. Additionally, both the GFS and EURO are hinting at a chance for PWATs ranging from 1-1.2" across southern UT Thursday-Saturday. While this remains far out in time, it does raise some concern for locally heavy rainfall which could result in flash flooding. Specifics are somewhat difficult to iron out at this time, though it bears watching. && .AVIATION...KSLC...VFR conditions will persist at the KSLC terminal through the TAF period. Typical diurnal wind shifts are expected to northwesterly around 17z and southeasterlies once again around 04- 05z. .REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions are expected to persist through the TAF period. Generally diurnal winds will take hold as overall flow remains light across UT and southwest WY. There is a chance for isolated showers and thunderstorms near KCDC and KBCE, though probabilities appear too low at this time to include in the TAF. && .FIRE WEATHER...Hot and generally dry high pressure will remain the primary influence on the weather over the next few days. However, southerly flow will start to draw mid-level moisture into the area from the south, bringing isolated high based afternoon thunderstorms, with gusty winds and dry lightning possible with any storms that develop. Winds will increase further on Tuesday, combining with the dry airmass to potentially produce critical fire weather conditions over portions of southern Utah. Some higher based moisture will continue to move in Tuesday into Wednesday, bringing a gradually increasing threat of high based showers and thunderstorms. Behind a weak cold front impacting the area later Wednesday, some drier air may move in, but deeper moisture is expected to return by the upcoming weekend. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...Fire Weather Watch from Tuesday afternoon through Tuesday evening for UTZ495>498. Extreme Heat Warning from noon today to 10 PM MDT this evening for UTZ123-124. WY...None. && $$ SHORT TERM/FIRE WEATHER...Traphagan LONG TERM/AVIATION...Worster For more information from NOAA`s National Weather Service visit... http://weather.gov/saltlakecity