Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 141, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 16, 2021, 12:20 PM MST for Pinal County, Arizona. It was in force for 55 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 16, 2021, 12:20 PM MST (19:20 UTC)
- Expired
- Aug 16, 2021, 1:15 PM MST
- In force
- 55 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Pinal County, AZ
The radar
The Tucson radar (KEMX), 85 km from the middle of the area, began a volume at 19:20 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 16, 12:24 PM MST | HAIL 0.88 | 1 Wsw Oracle, AZ |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 7.3 hours before the alert went out and 52 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
- 1291 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1297 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
736
WUUS55 KTWC 161920
SVRTWC
AZC021-162015-
/O.NEW.KTWC.SV.W.0141.210816T1920Z-210816T2015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
1220 PM MST Mon Aug 16 2021
The National Weather Service in Tucson has issued a
* Severe Thunderstorm Warning for...
Southeastern Pinal County in southeastern Arizona...
* Until 115 PM MST.
* At 1219 PM MST, a severe thunderstorm was located over Oracle,
moving south at 5 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Oracle, Saddlebrooke, Campo Bonito, Biosphere 2 and Oracle
Junction.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3271 11099 3271 11075 3252 11063 3252 11092
TIME...MOT...LOC 1919Z 339DEG 5KT 3261 11082
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GL2 follow-up statements
084
WWUS55 KTWC 161938
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
1238 PM MST Mon Aug 16 2021
AZC021-162015-
/O.CON.KTWC.SV.W.0141.000000T0000Z-210816T2015Z/
Pinal-
1238 PM MST Mon Aug 16 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM MST
FOR SOUTHEASTERN PINAL COUNTY...
At 1237 PM MST, a severe thunderstorm was located over Oracle, moving
south at 5 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Oracle, Saddlebrooke, Campo Bonito, Biosphere 2 and Oracle Junction.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3271 11099 3271 11075 3252 11063 3252 11092
TIME...MOT...LOC 1937Z 339DEG 5KT 3259 11081
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GL502
WWUS55 KTWC 162009
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
109 PM MST Mon Aug 16 2021
AZC021-162019-
/O.EXP.KTWC.SV.W.0141.000000T0000Z-210816T2015Z/
Pinal-
109 PM MST Mon Aug 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PINAL COUNTY WILL
EXPIRE AT 115 PM MST...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
LAT...LON 3271 11099 3271 11075 3252 11063 3252 11092
TIME...MOT...LOC 2009Z 339DEG 5KT 3249 11076
$$
GLThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 7:02 PM MST | Special Weather Statement | TWC | Greenlee | 43 min |
| Aug 15, 7:47 PM MST | Special Weather Statement | TWC | Graham | 58 min |
| Aug 15, 8:30 PM MST | Severe Thunderstorm Warning | TWC | Graham, Pinal | 46 min |
| Aug 16, 12:39 PM MST | Flash Flood Warning | TWC | Pinal | 3 hr |
| Aug 16, 1:27 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 48 min |
| Aug 16, 1:49 PM MST | Flash Flood Warning | TWC | Pinal | 3 hr |
| Aug 16, 3:06 PM MST | Areal Flood Advisory | TWC | Graham, Greenlee | 3 hr |
| Aug 16, 3:11 PM MST | Special Weather Statement | TWC | Santa Cruz | 34 min |
| Aug 16, 3:14 PM MST | Special Weather Statement | TWC | Graham | 46 min |
| Aug 16, 3:58 PM MST | Special Weather Statement | TWC | Graham | 47 min |
| Aug 16, 4:38 PM MST | Areal Flood Advisory | TWC | Graham, Greenlee | 3 hr |
| Aug 16, 4:44 PM MST | Severe Thunderstorm Warning | TWC | Graham | 46 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2021Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.