Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 32, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 21, 2021, 10:25 PM MST for Maricopa County, Arizona. It was in force for 16 min. 3 reports 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
- Jul 21, 2021, 10:25 PM MST (05:25 UTC)
- Expired
- Jul 21, 2021, 10:41 PM MST
- In force
- 16 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 35 km from the middle of the area, began a volume at 05:26 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 |
|---|---|---|---|
| Jul 21, 10:30 PM MST | HAIL 0.5 | 2 Sw Paradise Valley, AZ | *** DELAYED REPORT *** SOCIAL MEDIA POST SHOWS ACCUMULATING HAIL ALONG NORTH 53RD ST. BETWEEN EAST PALOMINO RD. AND EAST WONDERVIEW RD. WITH SIZES ESTIMATED TO BE SIMILAR TO NEARBY REPORTS. |
| Jul 21, 10:30 PM MST | HAIL 0.5 | 2 Wsw Scottsdale, AZ | *** DELAYED REPORT *** RESPONSE TO SOCIAL MEDIA POST REPORTED HAIL AT NORTH 56TH ST. AND EAST OSBORN RD. |
| Jul 21, 10:30 PM MST | HAIL 0.5 | 3 W Scottsdale, AZ | *** DELAYED REPORT *** SOCIAL MEDIA POST SHOWS HANDFUL OF HAIL WITH SIZE ESTIMATED FROM VIDEO NEAR EAST INDIAN SCHOOL RD. AND NORTH 50TH ST. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 5.4 hours before the alert went out and 6 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
- 760 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 3156 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
486 WUUS55 KPSR 220525 SVRPSR AZC013-220600- /O.NEW.KPSR.SV.W.0032.210722T0525Z-210722T0600Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Phoenix AZ 1025 PM MST Wed Jul 21 2021 The National Weather Service in Phoenix has issued a * Severe Thunderstorm Warning for... Maricopa County in south central Arizona... * Until 1100 PM MST. * At 1025 PM MST, a severe thunderstorm was located over Camelback Mountain, or near Paradise Valley, and is nearly stationary. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Phoenix, Scottsdale, Tempe, Paradise Valley, Tempe Marketplace, Papago Park, Piestewa Peak Park, Salt River Indian Community, North Mountain Park, Downtown Phoenix, Downtown Scottsdale, Arizona State University, Camelback Mountain and Sky Harbor Airport. * This includes the following highways... AZ Interstate 10 between mile markers 144 and 155. AZ Interstate 17 between mile markers 195 and 196. AZ Route 51 between mile markers 1 and 12. 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 3338 11194 3344 11210 3364 11206 3356 11180 TIME...MOT...LOC 0525Z 213DEG 4KT 3349 11196 HAIL...<.75IN WIND...60MPH $$ CK
2 follow-up statements
428 WWUS55 KPSR 220536 SVSPSR Severe Weather Statement National Weather Service Phoenix AZ 1036 PM MST Wed Jul 21 2021 AZC013-220600- /O.CON.KPSR.SV.W.0032.000000T0000Z-210722T0600Z/ Maricopa AZ- 1036 PM MST Wed Jul 21 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM MST FOR MARICOPA COUNTY... At 1035 PM MST, a severe thunderstorm was located over Camelback Mountain, or near Paradise Valley, and is nearly stationary. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Phoenix, Scottsdale, Tempe, Paradise Valley, Papago Park, Piestewa Peak Park, Downtown Phoenix, Downtown Scottsdale, Camelback Mountain and Sky Harbor Airport. This includes the following highways... AZ Interstate 10 between mile markers 145 and 149. AZ Route 51 between mile markers 1 and 10. AZ Route 202 between mile markers 1 and 7. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3343 11193 3344 11209 3361 11206 3356 11184 TIME...MOT...LOC 0535Z 134DEG 4KT 3350 11200 HAIL...<.75IN WIND...60MPH $$ CK
928
WWUS55 KPSR 220541
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
1041 PM MST Wed Jul 21 2021
AZC013-220551-
/O.CAN.KPSR.SV.W.0032.000000T0000Z-210722T0600Z/
Maricopa AZ-
1041 PM MST Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY IS
CANCELLED...
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 has been cancelled. However small hail, gusty
winds and heavy rain are still possible with this thunderstorm.
LAT...LON 3343 11193 3344 11209 3361 11206 3356 11184
TIME...MOT...LOC 0539Z 213DEG 4KT 3351 11200
$$
CKThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 5:37 PM MST | Special Weather Statement | PSR | Yuma | 38 min |
| Jul 21, 5:41 PM MST | Special Weather Statement | PSR | 49 min | |
| Jul 21, 6:18 PM MST | Severe Thunderstorm Warning | PSR | La Paz, Yuma | 42 min |
| Jul 21, 6:20 PM MST | Special Weather Statement | PSR | Gila | 40 min |
| Jul 21, 6:47 PM MST | Special Weather Statement | PSR | 43 min | |
| Jul 21, 6:59 PM MST | Special Weather Statement | PSR | Yuma | 46 min |
| Jul 21, 7:06 PM MST | Areal Flood Advisory | PSR | Gila | 3 hr |
| Jul 21, 7:10 PM MST | Special Weather Statement | PSR | La Paz | 50 min |
| Jul 21, 7:17 PM MST | Areal Flood Advisory | PSR | Yuma | 44 min |
| Jul 21, 7:40 PM MST | Dust Storm Warning | PSR | Yuma | 35 min |
| Jul 21, 8:01 PM MST | Flash Flood Warning | PSR | Yuma | 4 hr |
| Jul 21, 8:13 PM MST | Dust Storm Advisory | PSR | Yuma | 47 min |
| Jul 21, 9:06 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 39 min |
| Jul 21, 10:06 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 39 min |
| Jul 21, 10:11 PM MST | Special Weather Statement | PSR | Pinal | 49 min |
| Jul 21, 10:23 PM MST | Special Weather Statement | PSR | Maricopa | 37 min |
| Jul 21, 10:39 PM MST | Special Weather Statement | PSR | 36 min | |
| Jul 21, 10:51 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 24 min |
| Jul 21, 11:12 PM MST | Special Weather Statement | PSR | 48 min | |
| Jul 21, 11:15 PM MST | Special Weather Statement | PSR | Pinal | 45 min |
| Jul 22, 12:28 AM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 22, 12:32 AM MST | Areal Flood Advisory | PSR | Maricopa | 118 min |
| Jul 22, 3:06 PM MST | Special Weather Statement | PSR | 54 min | |
| Jul 22, 3:43 PM MST | Special Weather Statement | PSR | Maricopa | 47 min |
| Jul 22, 3:58 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 33 min |
| Jul 22, 4:30 PM MST | Dust Storm Advisory | PSR | Yuma | 41 min |
| Jul 22, 4:53 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
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.