Area Forecast Discussion
Issued by NWS Tucson, AZ
Issued by NWS Tucson, AZ
453 FXUS65 KTWC 220903 AFDTWC Area Forecast Discussion National Weather Service Tucson AZ 203 AM MST Sat Jun 22 2024 .SYNOPSIS...A strong increase in moisture will bring daily chances of thunderstorms to the area into next week. Some storms will generate strong outflow winds with locally heavy rain possible. This will also knock several degrees off of the heat. We may see temperatures climb back up a bit as high pressure settles overhead next week. && .DISCUSSION...Deep monsoon season conditions with unseasonably high moisture levels for late June will continue. Surface dewpoints in the 60s with precipitable water values between 1.3 and 1.7 inches. Additional moisture is pushing up the gulf and western Mexico, with Hermosillo dewpoints jumping 25 degrees into the 60s over the past 24 hours. KYUX vad wind profile showing a solid 15-20kt southerly flow up to 4k ft deep. We`re seeing a lot of light shower activity embedded in debris cloud pushing up from the south this morning. We`ll not be able to match yesterday`s insolation and moisture may actually end up being too high for stronger storms with organized outflows. Perhaps too much of a good thing. Regardless, we once again have Marginal risks from both SPC (for thunderstorm winds) and WPC (for excessive rainfall) for today, and that looks reasonable for now. As central and western areas (generally west of Tucson) continue to see increasing moisture, we`ll actually see some modest drying filtering into eastern areas. We may be down a bit in much of Cochise and Graham counties today after being worked over last night and this morning. Still, ensemble means continue to spread the ridge further west with the high center reconsolidating overhead the first half of the new week. Warmer mid levels and weaker moisture support should start to tamp storm coverage down a bit, but additional surface heating will counter that somewhat. The bottom line is we keep a chance of thunderstorms going well into next week, however we should start to rely more on recirculated boundary layer moisture with the overall trend down. It`s looking more and more as if we will keep enough moisture around to avoid more excessive heat headlines. There`s even a hint that we may see some moisture reinforcement from newly awakened Sinaloa and Sonora later next week. && .AVIATION...Valid through 23/12Z. SCT-BKN clouds 7K-12k ft AGL. SCT -SHRA with ISOLD -TSRA this morning, increasing chances between 22/18Z-23/03Z. TSRA and BKN CIGS around 6k ft AGL possible thru 23/03Z. East to southeast winds 10-15 kts. Stronger and erratic outflows possible with storms. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...A strong increase in moisture will bring better RH values along with a chance of thunderstorms into next week. Some storms will generate strong and erratic outflow winds. Moisture is expected to be deep enough for some storms to generate locally heavy rain. Temperatures may heat back up by mid week as high pressure builds nearly overhead, however we should keep some storm chances around. && .TWC WATCHES/WARNINGS/ADVISORIES... None. && $$ Meyer Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson