Heavy rainfall from thunderstorms resulted in flash flooding in the Corona De Tucson area.
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The episode as NWS TWC wrote it up.
Heavy rainfall from thunderstorms resulted in flash flooding in the Corona De Tucson area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Tucson, AZ wrote its last area forecast discussion before the first event at Aug 22, 9:21 AM MST, 4 hours 9 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 921 AM MST Thu Aug 22 2024 .SYNOPSIS...Scattered thunderstorms this afternoon and evening, mainly east of Sells. Heavy rain, strong wind gusts, and small hail will be possible with any thunderstorm. Thunderstorm chances become more isolated and shift east of Tucson Friday through the weekend. High temperatures near to slightly above normal through the forecast period. && .UPDATE... Moving in from the south, an MCV makes its way through Cochise county heading to the northeast. Unlike yesterday, this MCV is not bringing with it storms and showers, just a blanket of clouds. West of Cochise county, skies are mostly clear other than some high clouds that are generally dissipating. Moisture continues to stick around today with PWATs around 1.5-1.6 inches west of Tucson and 1-1.5 inches east of Tucson. There will be a fair bit of instability today with CAPE values around 2000 J/kg and DCAPE around 900-1200 J/kg. There will not be as much shear today as observed yesterday but still 15-25 knots from surface to 6 kilometers. Convection will be focused from Kitt Peak eastward and will begin developing around 1-2 PM MST starting out scattered becoming more widespread as the afternoon progresses. Storms will taper off around 6-7 PM MST. Storms and showers will generally be moving to the north northeast at 5-15 MPH. The main concerns associated with storm and showers today will be strong to severe winds and locally heavy rainfall that may lead to flash flooding. Hail and blowing dust are secondary concerns. Temperatures will be warmer today than yesterday with highs around 95-103 degrees. && .PREV DISCUSSION... /issued 326 AM MST Thu Aug 22 2024/ .DISCUSSION...The upper air pattern this morning was characterized by the subtropical high centered over far southeast New Mexico and noticeable troughiness over the Pacific Northwest. To the south, a mesoscale convective complex was rapidly decaying as it drifted to the north and west over Sonora Mexico. After yesterday's thunderstorm activity across southeast Arizona, the thunderstorm potential this afternoon becomes dependent upon multiple considerations including moisture, sunshine, and mesoscale features. Plenty of moisture resides over central and eastern portions of the forecast area with latest GOES precipitable water readings of 1.25 inches in southern Cochise County to around 1.5 inches across western Pima County. However, areas west of Tucson will begin drying out as the mean flow becomes southwesterly through the day. Unlike yesterday, morning convection and associated cloud cover will not be quite as favorable resulting in stronger daytime heating by mid to late morning. 0-6 km shear of 15-20 kts and sufficient CAPE will be supportive of scattered afternoon thunderstorms, a few of which could be strong to severe. Areas that were not worked over yesterday appear to be favored today with the CAMs highlighting areas to the east of Sells. The 22/00Z HREF depicted a 10 percent chance of winds exceeding 50 kts (58 mph) within 25 miles of a point specifically over Pinal County this afternoon and again on Friday afternoon for areas east of Tucson. Friday and Saturday the best chances for afternoon thunderstorms will be shunted further south and east of Tucson and will also be dependent upon convective activity this afternoon. Dry southwesterly flow will continue to dominate the Desert Southwest as a strong trough hangs around the upper Great Basin and Pacific Northwest. Friday may be an interesting transition day with the drier air surging a bit further east and increased dynamic support. Looking ahead into next week, ensembles show ridging building back in place over the Desert Southwest allowing additional moisture to return to the area along with daily chances for afternoon thunderstorms. However, there are differences in the timing and placement of the upper high which may impact how quickly storm chances return. Overall, looking like another average Monsoon day generally to the east of Sells. A few storms may be strong to severe with gusty winds, heavy rain, and small hail being the primary concerns. && .AVIATION...Valid through 23/12Z. Scattered showers and thunderstorms this afternoon and evening at all terminals. Visibility reductions, wind gusts up to 50 kts, heavy rain, and mountain obscurations possible with any thunderstorm. Outside of thunderstorm wind gusts, winds 12 kts or less with a southwest to northwesterly direction. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Mainly afternoon and evening showers and thunderstorms can be expected across southeast Arizona today, with a drying trend Friday through the weekend resulting in a reduction in thunderstorm activity. High temperatures will be near to slightly above normal through the forecast period. Min RH values will be in the 25-35 percent range in most valleys locations today, lowering to around 18-28 percent Friday through the weekend as drier air overspreads the area. Outside of any thunderstorm outflow winds, 20- foot winds will generally be 15 mph or less, with afternoon/early evening gusts to 20-25 mph and light winds overnight. && && .TWC WATCHES/WARNINGS/ADVISORIES... None. && Update...Malarkey Previous...DVS Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The Tucson radar (KEMX), 11 km away, was scanning. The volume nearest the first event began at 20:29 UTC.
1 flash flood. Local standard time, as filed.
Flooding in Corona De Tucson area. Road closed at Sahuarita west of Wilmot due to flooding. Road also closed at Davidson and Sahuarita due to flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2024Every state in 2024This day in weather historyWarnings in Arizona, August 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1211550.