Alert archive / Arizona / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 25, NWS Flagstaff, AZ

August 21, 2020Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 21, 2020, 4:19 PM MST for Yavapai County, Arizona. It was in force for 26 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
Aug 21, 2020, 4:19 PM MST (23:19 UTC)
Expired
Aug 21, 2020, 4:45 PM MST
In force
26 min
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 23:18 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 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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 21, 12:46 PM MST, 3 hours 33 minutes earlier.

Area forecast discussion, Aug 21, 12:46 PM MST, 3 hours 33 minutes before
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In the hours before

Special weather statement, Aug 21, 2:14 PM MST, 2 hours 5 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
214 PM MST Fri Aug 21 2020

AZZ015-016-212145-
Western Mogollon Rim-Eastern Mogollon Rim-
214 PM MST Fri Aug 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR NEAR MORMON LAKE IN COCONINO
COUNTY UNTIL 245 PM MST...

At 213 PM MST, Doppler radar was tracking a strong thunderstorm over
Mormon Lake, or 20 miles east of Sedona, moving south at 5 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Mormon Lake, Dairy Springs Campground and Double Springs Campground.

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 3500 11148 3496 11133 3480 11138 3487 11159
TIME...MOT...LOC 2113Z 016DEG 6KT 3492 11144

MCT
Special weather statement, Aug 21, 2:46 PM MST, 1 hour 33 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
246 PM MST Fri Aug 21 2020

AZZ017-018-212215-
Northern Gila County-White Mountains-
246 PM MST Fri Aug 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR NEAR WHITERIVER IN GILA...APACHE
AND NAVAJO COUNTIES UNTIL 315 PM MST...

At 243 PM MST, Doppler radar was tracking a strong thunderstorm near
Whiteriver, or 31 miles south of Show Low, moving southwest at 10
mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Turkey Creek, Seven Mile, Fort Apache, Whiteriver and East Fork.

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 3391 10989 3384 10972 3367 10982 3377 11003
TIME...MOT...LOC 2143Z 027DEG 8KT 3382 10986

MCT
Special weather statement, Aug 21, 3:13 PM MST, 1 hour 6 minutes before
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      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Special weather statement, Aug 21, 3:40 PM MST, 39 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
340 PM MST Fri Aug 21 2020

AZZ008-015-037-038-212315-
Yavapai County Valleys and Basins-Western Mogollon Rim-Yavapai County
Mountains-Oak Creek and Sycamore Canyons-
340 PM MST Fri Aug 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR SEDONA AND OAK CREEK YAVAPAI AND
COCONINO COUNTIES UNTIL 415 PM MST...

At 339 PM MST, Doppler radar was tracking a strong thunderstorm over
Sedona, moving southwest at 25 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Sedona, Bridgeport, Village At Oak Creek, Garland's Oak Creek Lodge,
Page Springs, Cornville, Slide Rock State Park, Cottonwood, Red Rock
State Park, Dead Horse Ranch State Park, Manzanita Campground and
Tuzigoot National Monument.

LAT...LON 3503 11184 3481 11156 3462 11190 3482 11210
TIME...MOT...LOC 2239Z 048DEG 21KT 3485 11181

ET
Special weather statement, Aug 21, 3:53 PM MST, 26 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
353 PM MST Fri Aug 21 2020

AZZ008-037-212345-
Yavapai County Valleys and Basins-Yavapai County  Mountains-
353 PM MST Fri Aug 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR SELIGMAN IN YAVAPAI COUNTY UNTIL
445 PM MST...

At 352 PM MST, Doppler radar was tracking a strong thunderstorm 12
miles west of Seligman, or 50 miles northeast of Wikieup. This storm
was nearly stationary.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

This storm will remain over mainly rural areas of Yavapai County.

LAT...LON 3539 11306 3521 11292 3509 11317 3532 11333
TIME...MOT...LOC 2252Z 061DEG 4KT 3528 11309

ET
Special weather statement, Aug 21, 4:06 PM MST, 13 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
406 PM MST Fri Aug 21 2020

AZZ016-018-212330-
Northern Gila County-Eastern Mogollon Rim-
406 PM MST Fri Aug 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR GILA COUNTY NEAR PINE AND
COCONINO COUNTY UNTIL 430 PM MST...

At 405 PM MST, Doppler radar was tracking a strong thunderstorm over
Pine, or 11 miles northwest of Payson, moving west at 10 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Geronimo Estates, Freedom Acres, Flowing Springs, Pine, Strawberry,
Geronimo Boy Scout Camp, Water Wheel Burn At Houston Mesa Rd-
S, Tonto Natural Bridge State Park and Beaver Valley.

LAT...LON 3423 11155 3439 11158 3441 11156 3442 11153
      3443 11148 3446 11140 3433 11127
TIME...MOT...LOC 2305Z 080DEG 10KT 3439 11142

ET

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 20, 5:01 PM MSTSevere Thunderstorm WarningFGZGila, Yavapai44 min
Aug 20, 5:41 PM MSTSpecial Weather StatementFGZ49 min
Aug 20, 6:02 PM MSTSpecial Weather StatementFGZ28 min
Aug 21, 12:40 PM MSTSpecial Weather StatementFGZ35 min
Aug 21, 1:25 PM MSTSpecial Weather StatementFGZ50 min
Aug 21, 1:47 PM MSTSpecial Weather StatementFGZ28 min
Aug 21, 2:14 PM MSTSpecial Weather StatementFGZ31 min
Aug 21, 2:46 PM MSTSpecial Weather StatementFGZ29 min
Aug 21, 3:13 PM MSTSpecial Weather StatementFGZ32 min
Aug 21, 3:40 PM MSTSpecial Weather StatementFGZ35 min
Aug 21, 3:53 PM MSTSpecial Weather StatementFGZ52 min
Aug 21, 4:06 PM MSTSpecial Weather StatementFGZ24 min
Aug 21, 4:43 PM MSTAreal Flood AdvisoryFGZYavapai3 hr
Aug 21, 4:46 PM MSTSevere Thunderstorm WarningFGZYavapai44 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2020Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.