Alert archive / Arizona / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 77, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Sep 12, 2025, 5:46 PM MST for Greenlee County, Arizona. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 12, 2025, 5:46 PM MST (00:46 UTC)
- Expired
- Sep 12, 2025, 6:45 PM MST
- In force
- 59 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Greenlee County, AZ
The radar
The Tucson radar (KEMX), 196 km from the middle of the area, began a volume at 00:46 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 0.8 hours before the alert went out and 194 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 472 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 2729 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Sep 12, 12:56 PM MST, 4 hours 50 minutes earlier.
Area forecast discussion, Sep 12, 12:56 PM MST, 4 hours 50 minutes before
Area Forecast Discussion National Weather Service Tucson AZ 1256 PM MST Fri Sep 12 2025 .SYNOPSIS... Scattered afternoon and evening thunderstorms will continue today mainly near and east of a line from Dudleyville through Tucson and Nogales. Thunderstorms may linger longest overnight through Graham, Greenlee, and Cochise counties. An isolated risk of strong winds, large hail, heavy rain, and blowing dust will accompany these thunderstorms. Dry air begins to push in Saturday with thunderstorm chances lingering south and east of Tucson, with a dry forecast on Sunday. Temperatures transition from below normal this weekend to above normal next week with a modest return of thunderstorm chances. && .DISCUSSION... An active thunderstorm day is expected to develop this afternoon across much of southeastern Arizona, especially from central- eastern Pinal/Pima to Santa Cruz and eastward. Healthy 1500-2500 J/kg of MLCAPE and 20- 30 knots of 0-6 km shear will produce an environment capable of longer lasting individual thunderstorm cells capable of damaging wind gusts, hail, and heavy rainfall. With a deep upper level trough to the west, ample forcing/ascent exists for thunderstorm development through the late evening and lasting potentially through the overnight hours, especially in eastern locations. Looking at the western edge of the environment capable of these thunderstorms, mid-level moisture has pushed a bit further west through Tucson compared to where it was just 24 hours ago (as indicated by the Advected Layered Precipitable Water product). This will subsequently bring greater thunderstorm chances further west than yesterday, including southward through Nogales and north through central-eastern Pinal. Strong flow oriented from southwest to northeast will push thunderstorms that form over the Catalinas away from Tucson, so impactful storms in Tucson will likely need to form to the west or south...if not over town. This weekend, the western trough will make its trek eastward across the Four Corners region, dragging moisture mostly out of southeastern Arizona with it. Moisture should linger in far southeastern and eastern, keeping chances mainly to Cochise, Santa Cruz, and southern Graham/Greenlee counties on Saturday. Then Sunday moisture should push out enough to keep a dry forecast for the day. With this trough crossing temperatures will dip below normal for the weekend. Following the trough passage, a ridge centered to the south is expected to build and bring at least some moisture back into the region early next week. There remains some discrepancies in how well moisture returns, so chances remain modest and mainly to the south and east of Tucson (in the 10-30 percent range on Tuesday). && .AVIATION... Scattered thunderstorms expected this afternoon near and east of KTUS-KOLS through the afternoon and evening, with greater chances in Graham, Greenlee, and Cochise counties. Should diminish in western areas such as KTUS- KOLS after 13/04Z, lingering through the overnight hours in eastern terminals such as KSAD- KDUG. An isolated risk of wind gusts to 50 kts and large hail will accompany any thunderstorm, along with very heavy rainfall and mountain obscurations. Otherwise, SLY/SWLY SFC wind at 10-16 kts with gusts to 20-25 kts thru 13/04Z. SFC wind less than 10 kts and variable in direction at other times. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER... Minimum RH values will be in the 20-35 percent range through Saturday, lowering into the 15-30 percent range Sunday and Monday. Scattered showers and thunderstorms are expected from the Tucson area eastward today, with a chance of showers and thunderstorms mainly for Cochise County and east Santa Cruz County Saturday. Thunderstorms today will have a risk of very strong gusty winds, large hail, and very heavy rainfall. Dry area- wide Sunday, then a slight chance of thunderstorms south and east of Tucson return again next week. Outside of thunderstorm outflows, expect 20-foot winds to be 15 mph or less, with some afternoon/early evening gusts to around 25 mph. && .TWC WATCHES/WARNINGS/ADVISORIES... None. && Public...Edwards Aviation...Edwards Fire Weather....Edwards Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
In the hours before
Local storm report, Sep 12, 12:17 PM MST, 5 hours 29 minutes before
Preliminary Local Storm Report
National Weather Service Tucson AZ
1217 PM MST Fri Sep 12 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1130 AM Hail 1 SE San Manuel 32.61N 110.63W
09/12/2025 E1.00 Inch Pinal AZ Public
Photo and video of numerous 1 inch hail
stones via Facebook.
&&
CLPLocal storm report, Sep 12, 1:10 PM MST, 4 hours 36 minutes before
Preliminary Local Storm Report
National Weather Service Tucson AZ
110 PM MST Fri Sep 12 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1011 AM Landspout 19 WNW Benson 32.11N 110.57W
09/12/2025 Pima AZ Public
Time and location estimated with radar. No
damage reported.
&&
CWRLocal storm report, Sep 12, 3:51 PM MST, 1 hour 55 minutes before
Preliminary Local Storm Report
National Weather Service Tucson AZ
351 PM MST Fri Sep 12 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0347 PM Tstm Wnd Dmg 13 NE Willcox 32.36N 109.66W
09/12/2025 Cochise AZ 911 Call Center
Report of overturned semitruck.
&&
JVTLocal storm report, Sep 12, 3:53 PM MST, 1 hour 53 minutes before
Preliminary Local Storm Report
National Weather Service Tucson AZ
353 PM MST Fri Sep 12 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0341 PM Tstm Wnd Gst 13 ENE Willcox 32.35N 109.65W
09/12/2025 M60 MPH Cochise AZ Mesonet
Weather station recorded wind gust of 60
mph.
&&
JVTLocal storm report, Sep 12, 4:13 PM MST, 1 hour 33 minutes before
Preliminary Local Storm Report
National Weather Service Tucson AZ
413 PM MST Fri Sep 12 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM Hail 13 NE Willcox 32.36N 109.66W
09/12/2025 E1.50 Inch Cochise AZ Trained Spotter
Estimated hail size of 1.5 inches with hail
accumulation covering the roadways of
roughly 8 inches deep.
&&
JVTLocal storm report, Sep 12, 4:37 PM MST, 1 hour 9 minutes before
Preliminary Local Storm Report
National Weather Service Tucson AZ
437 PM MST Fri Sep 12 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0424 PM Hail 17 NE Willcox 32.44N 109.66W
09/12/2025 E1.50 Inch Graham AZ Storm Chaser
Estimated 1.5 inch hail along Highway 191.
&&
JVTThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 8:17 PM MST | Severe Thunderstorm Warning | TWC | Graham, Greenlee | 43 min |
| Sep 12, 8:28 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima | 47 min |
| Sep 12, 9:10 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 50 min |
| Sep 12, 9:57 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Graham | 48 min |
| Sep 12, 10:55 PM MST | Severe Thunderstorm Warning | TWC | Graham, Greenlee | 50 min |
| Sep 13, 12:14 PM MST | Areal Flood Advisory | TWC | Cochise | 3 hr |
| Sep 13, 12:44 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 25 min |
| Sep 13, 1:16 PM MST | Areal Flood Advisory | TWC | Cochise | 3 hr |
Nearby
Severe Thunderstorm Warnings in Arizona, 2025Every severe thunderstorm warning in 2025
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.