Alert archive / Arizona / Special Weather Statements in 2021
Special Weather Statement, NWS Tucson, AZ
NWS Tucson, AZ issued this special weather statement at Jul 17, 2021, 8:04 PM MST for Graham County, Arizona. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2021, 8:04 PM MST (03:04 UTC)
- Expired
- Jul 17, 2021, 8:45 PM MST
- In force
- 41 min
- Issued by
- NWS Tucson, AZ
County Graham County, AZ
The radar
The Tucson radar (KEMX), 110 km from the middle of the area, began a volume at 03:04 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, 3.1 hours before the alert went out and 116 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
- 59 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 2570 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted.
216 WWUS85 KTWC 180304 SPSTWC Special Weather Statement National Weather Service Tucson AZ 804 PM MST Sat Jul 17 2021 AZZ508-509-511-180345- Upper Gila River and Aravaipa Valleys including Clifton/Safford-Eastern Cochise County Below 5000 Feet including Douglas/Willcox-Galiuro and Pinaleno Mountains including Mount Graham- 804 PM MST Sat Jul 17 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL GRAHAM AND NORTH CENTRAL COCHISE COUNTIES UNTIL 845 PM MST... At 804 PM MST, Doppler radar was tracking a strong thunderstorm 16 miles northeast of Willcox, moving northwest at 25 mph. Dime size hail will be possible with this storm. Locations impacted include... Fort Grant, Mount Graham and Bonita. 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. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 3245 10955 3234 10976 3258 11003 3279 10978 TIME...MOT...LOC 0304Z 149DEG 20KT 3246 10972 $$ Singer
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 6:50 PM MST | Special Weather Statement | TWC | Cochise | 25 min |
| Jul 17, 8:28 PM MST | Special Weather Statement | TWC | Cochise | 32 min |
| Jul 18, 6:19 AM MST | Special Weather Statement | TWC | Santa Cruz | 41 min |
| Jul 18, 7:55 AM MST | Areal Flood Advisory | TWC | Santa Cruz | 3 hr |
| Jul 18, 11:57 AM MST | Areal Flood Advisory | TWC | Cochise | 3 hr |
| Jul 18, 1:00 PM MST | Areal Flood Advisory | TWC | Graham | 109 min |
| Jul 18, 1:28 PM MST | Flash Flood Watch | TWC | Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz | 11 hr |
| Jul 18, 2:36 PM MST | Areal Flood Advisory | TWC | Graham | 3 hr |
| Jul 18, 3:05 PM MST | Severe Thunderstorm Warning | TWC | Graham | 40 min |
| Jul 18, 3:36 PM MST | Areal Flood Advisory | TWC | Graham | 114 min |
| Jul 18, 4:08 PM MST | Flash Flood Warning | TWC | Greenlee | 112 min |
| Jul 18, 4:10 PM MST | Special Weather Statement | TWC | 35 min | |
| Jul 18, 4:16 PM MST | Areal Flood Advisory | TWC | Graham, Greenlee | 119 min |
| Jul 18, 4:21 PM MST | Areal Flood Advisory | TWC | Graham | 114 min |
| Jul 18, 4:36 PM MST | Flash Flood Warning | TWC | Graham, Greenlee | 3 hr |
| Jul 18, 4:45 PM MST | Areal Flood Advisory | TWC | Cochise | 2 hr |
| Jul 18, 4:50 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 40 min |
| Jul 18, 4:58 PM MST | Flash Flood Warning | TWC | Cochise | 2 hr |
Nearby
Special Weather Statements in Arizona, 2021Every special weather statement in 2021
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.