Alert archive / Arizona / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 12, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 21, 2019, 2:57 PM MST for Pima County, Arizona. It was in force for 48 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
- Jul 21, 2019, 2:57 PM MST (21:57 UTC)
- Expired
- Jul 21, 2019, 3:45 PM MST
- In force
- 48 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
County Pima County, AZ
The radar
The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 22:00 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 12:00Z, 10.0 hours before the alert went out and 84 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
- 927 J/kg
- Mixed-layer CIN
- -209 J/kg
- Mixed-layer LCL
- 1899 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -58 m²/s²
- 0-3 km storm-relative helicity
- -33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 21, 8:10 AM MST, 6 hours 47 minutes earlier.
Area forecast discussion, Jul 21, 8:10 AM MST, 6 hours 47 minutes before
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</html>In the hours before
Special weather statement, Jul 21, 1:02 PM MST, 1 hour 55 minutes before
Special Weather Statement National Weather Service Tucson AZ 102 PM MST Sun Jul 21 2019 AZZ502-503-515-212045- Tohono O'odham Nation including Sells-Upper Santa Cruz River and Altar Valleys including Nogales-Baboquivari Mountains including Kitt Peak- 102 PM MST Sun Jul 21 2019 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PIMA COUNTY UNTIL 145 PM MST... At 100 PM MST, Doppler radar was tracking a strong thunderstorm over Kitt Peak, or 16 miles east of Sells, moving northwest at 5 mph. Half inch hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... San Isidro, Kitt Peak and Pan Tak. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3189 11147 3174 11161 3201 11173 3209 11151 TIME...MOT...LOC 2000Z 169DEG 5KT 3194 11159 Meyer
Special weather statement, Jul 21, 2:26 PM MST, 31 minutes before
Special Weather Statement National Weather Service Tucson AZ 226 PM MST Sun Jul 21 2019 AZZ502-503-515-212215- Tohono O'odham Nation including Sells-Upper Santa Cruz River and Altar Valleys including Nogales-Baboquivari Mountains including Kitt Peak- 226 PM MST Sun Jul 21 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL PIMA COUNTY UNTIL 315 PM MST... At 225 PM MST, Doppler radar was tracking a strong thunderstorm 12 miles northwest of Arivaca, or 24 miles west of Tubac, moving north at 5 mph. Half inch hail and winds in excess of 45 mph will be possible with this storm. Locations impacted include... Fresnal Canyon. 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 11131 3153 11142 3180 11182 3187 11143 TIME...MOT...LOC 2125Z 166DEG 6KT 3173 11144 Meyer
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 1:02 PM MST | Special Weather Statement | TWC | Pima | 43 min |
| Jul 21, 1:07 PM MST | Severe Thunderstorm Warning | TWC | Pima | 38 min |
| Jul 21, 2:26 PM MST | Special Weather Statement | TWC | Pima | 49 min |
| Jul 21, 3:35 PM MST | Special Weather Statement | TWC | Santa Cruz | 25 min |
| Jul 21, 4:16 PM MST | Special Weather Statement | TWC | Pima | 44 min |
| Jul 21, 4:43 PM MST | Severe Thunderstorm Warning | TWC | Pima | 30 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2019Every severe thunderstorm warning in 2019
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.