Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 112, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 15, 2021, 1:22 PM MST for Apache 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
- Aug 15, 2021, 1:22 PM MST (20:22 UTC)
- Expired
- Aug 15, 2021, 2:00 PM MST
- In force
- 38 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Apache County, AZ
The radar
The Flagstaff radar (KFSX), 221 km from the middle of the area, began a volume at 20:21 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.4 hours before the alert went out and 241 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
- 9 J/kg
- Mixed-layer CIN
- -172 J/kg
- Mixed-layer LCL
- 2026 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
947 WUUS55 KFGZ 152022 SVRFGZ AZC001-152100- /O.NEW.KFGZ.SV.W.0112.210815T2022Z-210815T2100Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Flagstaff AZ 222 PM MDT Sun Aug 15 2021 The National Weather Service in Flagstaff has issued a * Severe Thunderstorm Warning for... Apache County in northeastern Arizona... * Until 300 PM MDT. * At 222 PM MDT, a severe thunderstorm was located 7 miles west of Window Rock, or 28 miles northwest of Gallup, moving southwest at 5 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * This severe thunderstorm will remain over mainly rural areas of Apache County. 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 3578 10918 3574 10907 3550 10922 3574 10938 TIME...MOT...LOC 2022Z 041DEG 5KT 3569 10920 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ RR
2 follow-up statements
289 WWUS55 KFGZ 152039 SVSFGZ Severe Weather Statement National Weather Service Flagstaff AZ 239 PM MDT Sun Aug 15 2021 AZC001-152100- /O.CON.KFGZ.SV.W.0112.000000T0000Z-210815T2100Z/ Apache- 239 PM MDT Sun Aug 15 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR APACHE COUNTY... At 239 PM MDT, a severe thunderstorm was located 8 miles west of Window Rock, or 29 miles west of Gallup, moving southwest at 5 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. This severe thunderstorm will remain over mainly rural areas of Apache County. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3578 10918 3574 10907 3550 10922 3574 10938 TIME...MOT...LOC 2039Z 041DEG 5KT 3567 10922 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ RR
149
WWUS55 KFGZ 152051
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
251 PM MDT Sun Aug 15 2021
AZC001-152101-
/O.EXP.KFGZ.SV.W.0112.000000T0000Z-210815T2100Z/
Apache-
251 PM MDT Sun Aug 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR APACHE COUNTY WILL EXPIRE AT
300 PM MDT...
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 3578 10918 3574 10907 3550 10922 3574 10938
TIME...MOT...LOC 2051Z 041DEG 5KT 3566 10923
$$
RRThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 12:37 PM MST | Special Weather Statement | FGZ | 23 min | |
| Aug 15, 12:52 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 38 min |
| Aug 15, 1:43 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 36 min |
| Aug 15, 2:17 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 43 min |
| Aug 15, 2:33 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 15, 2:42 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 48 min |
| Aug 15, 3:36 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 39 min |
| Aug 15, 3:49 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Navajo | 26 min |
| Aug 15, 3:52 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 23 min |
| Aug 15, 4:49 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 41 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.