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Area Forecast Discussion
Issued by NWS Flagstaff, AZ
Issued by NWS Flagstaff, AZ
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101 FXUS65 KFGZ 091634 AFDFGZ Area Forecast Discussion National Weather Service Flagstaff AZ 934 AM MST Tue Jul 9 2024 .SYNOPSIS...Hot temperatures will continue through much of the week, but starting today, precipitation chances will gradually increase through the weekend and into next week. && .UPDATE...Latest hi-res CAM and U of A WRF guidance indicates the potential for a few showers and thunderstorms, mainly along and south of the eastern Mogollon Rim and White Mountains. Much of the activity will be high-based, with gusty winds being the primary threat from any stronger storm. A couple isolated storms will also be possible across the Black Hills and Bradshaw Mountains in Yavapai County. Hot and dry conditions are otherwise expected across northern Arizona. Minor updates this morning to bring PoPs a touch further west across Gila county and add latest HRRR smoke guidance. && .PREV DISCUSSION /337 AM MST/...High pressure continues to be centered over southern Nevada and northeastern Arizona, allowing temperatures to stay hot across the state. Afternoon highs will stay 5-15 degrees above average for the next few days, so there is a good chance we will see more record breaking temperatures before the end of the week. The dominating ridge will gradually push eastward throughout the week, landing in a more favorable monsoon pattern by the weekend. As a result, moisture will slowly increase across northern Arizona starting today and become more widespread by Saturday. For today, the majority of precipitation/thunderstorms will be focused near the White Mountains and eastern Mogollon Rim. On the flip side, the latest U of A WRF run and the SPC HREF shows potential for a few isolated thunderstorms across Yavapai County this afternoon. Due to limited moisture and a large anticipated inversion layer, storms that do form today will likely be on the dry side. The potential for convective activity will spread westward each afternoon, but greatest chances will remain focused over the higher terrain. Despite PWAT values increasing through the week and hi-res guidance indicating the return of the monsoon, high pressure will still be sitting over much of the state. As a result, hot temperatures will stick around through much of the period. The Excessive Heat Warning remains in effect for Yavapai County below 4000 feet through Thursday evening and for Marble/Glen Canyons below 4000 feet through Friday evening. Keep in mind depending on when/where showers/storms begin to form, afternoon highs may stay a little cooler than forecast, but even so, it will be hot. Lastly, overnight and early morning smoke/haze will continue to be noted across varies portions of our CWA due to a couple of wildfires in Utah and a few here in Arizona. && .AVIATION...Tuesday 09/12Z through Wednesday 10/12Z...Mainly VFR conditions outside of isolated SHRA/TSRA along and south of a KFLG-KSJN line. Gusty and erratic winds in the vicinity of SHRA/TSRA. Otherwise, look for variable surface winds at 5-15 kts gusting 20 kts between 18Z-03Z, turning light and variable during the overnight hours. Haze and smoke may reduce visibilities, especially near KPGA and KGCN. OUTLOOK...Wednesday 10/12Z through Friday 12/12Z...Mainly VFR conditions outside of isolated to scattered SHRA/TSRA along and south of a KFLG-KSJN line. Storms mainly isolated toward KFLG/KPRC with scattered coverage south of KSOW/KSJN. Gusty and erratic winds in the vicinity of SHRA/TSRA. Otherwise, variable winds at 5-15 kts. Haze and smoke may continue to be an issue near KPGA and KGCN. && .FIRE WEATHER...Today and Wednesday...Continued very hot and mainly dry. Chances for mainly high-based showers and thunderstorms start today near the White Mountains, pushing further west on Wednesday. Wetting rains are not likely in this time frame. Winds generally light and variable, 5 to 15 mph. Thursday through Saturday...Hot with gradually increasing chances for showers and thunderstorms. Winds light and variable at 5 to 10 mph. && .FGZ WATCHES/WARNINGS/ADVISORIES... Excessive Heat Warning until 8 PM MST /9 PM MDT/ Friday for AZZ005-006. Excessive Heat Warning until 8 PM MST Thursday for AZZ037. && $$ PUBLIC...Humphreys/Konieczny AVIATION...McCollum FIRE WEATHER...Peterson For Northern Arizona weather information visit weather.gov/flagstaff