Isolated thunderstorms moved southwest across southeast Arizona. One storm produced damaging winds near Patagonia Lake.
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The episode as NWS TWC wrote it up.
Isolated thunderstorms moved southwest across southeast Arizona. One storm produced damaging winds near Patagonia Lake.
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 Jul 12, 2:30 PM MST, 0 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 230 PM MST Wed Jul 12 2017 .SYNOPSIS...Expect scattered mainly afternoon and evening thunderstorms into the middle of next week. Some thunderstorms will produce locally heavy rainfall. Daily high temperatures will mostly be close to seasonal normals. && .DISCUSSION...So the area that had departing showers this morning has been very activity this afternoon. Interesting. Scattered thunderstorms will continue to develop over the higher terrain this afternoon with outflows pushing to the west southwest. High resolution models bring storms into the Tucson metro area between 7 and 9 pm. However need to get storms going NE of Tucson for this to happen and the way satellite is looking, this might not happen. Wait and see game. Main threat from any storms for the rest of this afternoon into this evening will be heavy downpours and localized severe winds. Steering flow and shear increase Thursday as an inverted trof, currently east of the Big Bend continues to push west. Thus severe potential will be up Thursday afternoon/evening along with localized flash flooding as atmosphere remains wet. Will maintain a standard monsoon forecast thru the weekend into early next week with the usual day-to-day variation in areal coverage of storms. Temperatures will work out that way also. && .AVIATION...Valid thru 13/23Z. Scattered -TSRA/-SHRA mainly from KTUS vicinity east and south through the late evening hours. Brief gusts near 45 kts with the strongest TSRA. Otherwise, VFR conditions with surface wind swly to nwly 8-18 kts and gusts to 25 kts into this evening before dropping to 12 kts or less overnight. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Scattered mainly afternoon and evening thunderstorms will prevail into the middle of next week. Expect brief strong, gusty and erratic winds due to thunderstorm outflows. Otherwise, 20- foot winds will generally be terrain driven at less than 15 mph. Occasional gusts will occur during the afternoon hours due to daytime heating. High temperatures will be close to seasonal normals this week and increased moisture will result in moderate relative humidity levels. && .TWC WATCHES/WARNINGS/ADVISORIES...None. && Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
Special Weather Statement National Weather Service Tucson AZ 1221 PM MST WED JUL 12 2017 AZZ508-512-122000- Chiricahua Mountains including Chiricahua National Monument-Eastern Cochise County Below 5000 Feet including Douglas/Willcox- 1221 PM MST WED JUL 12 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL COCHISE COUNTY UNTIL 100 PM MST... At 1219 PM MST, Doppler radar was tracking a strong thunderstorm 4 miles east of Elfrida, moving west at 10 mph. Wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Elfrida and McNeal. LAT...LON 3175 10952 3157 10955 3157 10978 3180 10969 TIME...MOT...LOC 1919Z 099DEG 10KT 3168 10963
Special Weather Statement National Weather Service Tucson AZ 127 PM MST WED JUL 12 2017 AZZ507-513-122100- Upper San Pedro River Valley including Sierra Vista/Benson-Dragoon/Mule/Huachuca and Santa Rita Mountains including Bisbee/Canelo Hills/Madera Canyon- 127 PM MST WED JUL 12 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN COCHISE COUNTY UNTIL 200 PM MST... At 126 PM MST, Doppler radar was tracking a strong thunderstorm over Sierra Vista, moving southwest at 15 mph. Winds in excess of 40 mph will be possible with this storm. Locations impacted include... Sierra Vista, Huachuca City, Sierra Vista Southeast and Fort Huachuca. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3167 11024 3151 11014 3143 11042 3163 11046 TIME...MOT...LOC 2026Z 059DEG 14KT 3157 11030
The Tucson radar (KEMX), 49 km away, was scanning. The volume nearest the first event began at 21:30 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds broke off a 4 inch diameter tree limb near Patagonia Lake.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2017Every state in 2017This day in weather historyWarnings in Arizona, July 2017
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: 710921.