Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 77, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 19, 2021, 5:37 PM MST for Pima County, Santa Cruz County, Arizona. It was in force for 38 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 19, 2021, 5:37 PM MST (00:37 UTC)
- Expired
- Jul 19, 2021, 6:15 PM MST
- In force
- 38 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Pima County, AZ, Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 69 km from the middle of the area, began a volume at 00:37 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, 0.6 hours before the alert went out and 71 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
- 134 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 2677 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
018
WUUS55 KTWC 200037
SVRTWC
AZC019-023-200115-
/O.NEW.KTWC.SV.W.0077.210720T0037Z-210720T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
537 PM MST Mon Jul 19 2021
The National Weather Service in Tucson has issued a
* Severe Thunderstorm Warning for...
South central Pima County in southeastern Arizona...
Northwestern Santa Cruz County in southeastern Arizona...
* Until 615 PM MST.
* At 537 PM MST, a severe thunderstorm was located near Arivaca, or
12 miles west of Tubac, moving southwest at 15 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...
Arivaca, Ruby and Arivaca Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3174 11132 3161 11109 3142 11123 3158 11148
TIME...MOT...LOC 0037Z 039DEG 14KT 3157 11126
HAIL...1.00IN
WIND...60MPH
$$
GL2 follow-up statements
731 WWUS55 KTWC 200055 SVSTWC Severe Weather Statement National Weather Service Tucson AZ 555 PM MST Mon Jul 19 2021 AZC019-023-200115- /O.CON.KTWC.SV.W.0077.000000T0000Z-210720T0115Z/ Pima-Santa Cruz- 555 PM MST Mon Jul 19 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MST FOR SOUTH CENTRAL PIMA AND NORTHWESTERN SANTA CRUZ COUNTIES... At 555 PM MST, a severe thunderstorm was located near Arivaca, or 16 miles southwest of Tubac, moving southwest at 15 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Arivaca, Ruby and Arivaca Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3174 11132 3161 11109 3142 11123 3158 11148 TIME...MOT...LOC 0055Z 039DEG 14KT 3151 11131 HAIL...0.75IN WIND...60MPH $$ GL
171
WWUS55 KTWC 200105
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
605 PM MST Mon Jul 19 2021
AZC019-023-200115-
/O.EXP.KTWC.SV.W.0077.000000T0000Z-210720T0115Z/
Pima-Santa Cruz-
605 PM MST Mon Jul 19 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PIMA AND
NORTHWESTERN SANTA CRUZ COUNTIES WILL EXPIRE AT 615 PM MST...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
LAT...LON 3174 11132 3161 11109 3142 11123 3158 11148
TIME...MOT...LOC 0105Z 039DEG 14KT 3150 11132
$$
GLThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 4:12 PM MST | Special Weather Statement | TWC | Pima | 33 min |
| Jul 20, 4:40 PM MST | Special Weather Statement | TWC | Graham | 50 min |
| Jul 20, 4:52 PM MST | Special Weather Statement | TWC | Pima | 53 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.