A line of thunderstorms moved through Nogales resulting in severe wind gusts, property damage, and flash flooding.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS TWC wrote it up.
A line of thunderstorms moved through Nogales resulting in severe wind gusts, property damage, and flash flooding.
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 6, 9:23 AM MST, 4 hours 27 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 923 AM MST Tue Aug 6 2024 .UPDATE...Current water vapor imagery shows an upper level low centered over the border of Chihuahua and Sonora with a nose of dry air extending from the Texas Panhandle through the White Mountains and into western Pima County. This low will progress northwestward today providing upper level support to storms this afternoon and evening. The 12Z KTWC sounding measured 1.43 inches of PWAT with dry air in the mid to upper levels. PWATS will increase by about a tenth of an inch this afternoon ranging from 1.5" in Tucson to 1.75" in western Pima County and 1.1" along the AZ/NM border. The 06/12Z HREF and other CAMs initiate storms along a line from Nogales to Tucson between 1 PM and 3 PM with storms then moving westward into central and western Pima County and Pinal County. Storms will be aided by 1000-1500 J/kg of MLCAPE along with steep low-level to mid-level lapse rates. With the upper level moving through 0-6 km shear will be elevated with the HREF showing values between 30-40 kts. This will lead to strong updrafts and long- lived storms with some supercells possible. Storms will be capable of strong to severe wind gusts aided by 1500 J/kg of DCAPE and the mid-level dry air currently shown on water vapor. Also can't rule out some isolated severe hail as well. SPC has areas from Tucson westward in a slight risk for severe weather. As storms propagate westward blowing dust will also be an issue, so a blowing dust advisory is in effect from 4 PM to 8 PM for areas west and north of Tucson. Heavy rainfall will also be a threat with these storms. HREF 3 hour probability matched mean QPF is highlighting Santa Cruz County as well as southern Tohono O'odham Nation with 50-70 percent chance for an inch or greater and 10 percent chance for three inches this afternoon and evening. WPC also has areas from Tucson westward in a slight risk for excessive rainfall. Please see the previous discussion for longer term details. && .PREV DISCUSSION... /issued 222 AM MST Tue Aug 6 2024/ .SYNOPSIS...A disturbance aloft will result in an active monsoon pattern for Tuesday with numerous showers and thunderstorms, especially from Tucson westward. Otherwise, expect scattered showers and thunderstorms each day through this week, with potential for heavy rainfall and strong wind gusts. Temperatures cool to near normal levels Tuesday through Thursday, then warm up to above normal levels Friday through the weekend. && .DISCUSSION...Radar this morning was showing isolated showers and t-storms moving west/southwest across Cochise, Pima and Santa Cruz counties. The late evening round of storms produced localized rainfall up to 0.75" and wind gusts up to 45 mph. Water vapor imagery this morning showed an inverted trof across Chihuahua MX moving slowly to the west. This feature will be the driver in our weather today as it moves into Sonora MX, with the potential for strong to severe thunderstorms and locally heavy rain, mainly from Tucson west. 06/00z HREF showing much of the western half of forecast area with 10% chance of wind gusts 58 mph or greater between 3 pm and midnight as storms move to the west. Outflow winds will kick up the dust, thus after coordinating with WFO Phoenix a blowing dust advisory was issued from 4 pm to 8 pm for areas west/northwest of Tucson. On the precip side, with PW values in the 1.5" to 2" range west of Tucson, localized heavy rainers are likely that will increase the threat flash flooding. With all that said, SPC has outlined the western half of our area in a marginal risk for severe thunderstorms due to wind and WPC has pretty much the same area in a slight risk for flash flooding. Will have to watch some of the washes across central Pima county as they are running elevated this morning after recent rains. Thunderstorm coverage on Wednesday is dependent on how worked over the atmosphere ends up. With the inverted trof hanging around southwest of the area heading into the weekend, daily chances of storms continue Thursday into the weekend with day-to-day variability on areal coverage of storms. Near normal temperatures are expected today through Thursday, then warmer temperatures return Friday through the weekend as heights increase with perhaps a bit of drying. && .AVIATION...Valid through 07/12Z. FEW-SCT clouds at 10k-14k ft AGL thru 06/18Z, then SCT-BKN clouds at 6k-9K ft AGL and BKN-OVC clouds at 10k-14k ft AGL thru the end of the forecast period. ISOLD -SHRA/-TSRA thru 06/18Z, then SCT-NMRS SHRA/TSRA thru 07/06Z, before slowly diminishing thereafter. MVFR conditions (locally IFR) expected near TSRA, with VSBY restrictions, wind gusts to 45+ kts, heavy rain, low cloud heights and mountain obscurations. Outside of thunderstorm wind gusts, wind speeds will be less than 12 kts, favoring an ELY through SLY direction. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Scattered to numerous showers and thunderstorms are expected today, with isolated to scattered mainly afternoon and evening showers and thunderstorms Wednesday through the upcoming weekend. Min RH values will be in the 25-40 percent range in the valleys through Thursday (and higher in the mountains), decreasing to 20-30 percent Friday through the weekend. Outside of 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... Blowing Dust Advisory from 4 PM this afternoon to 8 PM MST this evening for AZZ501-502-505. && Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The Tucson radar (KEMX), 56 km away, was scanning. The volume nearest the first event began at 20:48 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Nogales International Airport measured a wind gust of 75 mph. Video from social media showed multiple large trees down in a parking lot in Nogales due to severe wind gusts.
Heavy rain due to a thunderstorm caused a car to get stuck in a neighborhood wash drainage across intersection of E Calle Sonora and N Calle Guadalupe.
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: 1202228, 1202229.