Alert archive / Arizona / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 51, NWS Flagstaff, AZ

August 1, 2015Coconino County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 1, 2015, 12:07 PM MST for Coconino County, Arizona. It was in force for 23 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 1, 2015, 12:07 PM MST (19:07 UTC)
Expired: Aug 1, 2015, 12:30 PM MST
In force: 23 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 19:10 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 1, 9:56 AM MST, 2 hours 11 minutes earlier.

Area forecast discussion, Aug 1, 9:56 AM MST, 2 hours 11 minutes before

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In the hours before

Special weather statement, Aug 1, 11:52 AM MST, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1152 AM MST SAT AUG 1 2015

AZZ013-011915-
LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY-
1152 AM MST SAT AUG 1 2015

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL NAVAJO COUNTY UNTIL
1215 PM MST...

AT 1151 AM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR SNOWFLAKE...OR 20 MILES NORTH OF SHOW LOW...MOVING NORTH AT 10
MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SNOWFLAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM. DO NOT DRIVE
YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 3446 11004 3451 11014 3469 11012 3462 10989
TIME...MOT...LOC 1851Z 200DEG 9KT 3453 11006

Special weather statement, Aug 1, 11:56 AM MST, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1156 AM MST SAT AUG 1 2015

AZZ012-013-011930-
LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY-LITTLE COLORADO RIVER
VALLEY IN NAVAJO COUNTY-
1156 AM MST SAT AUG 1 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN COCONINO AND
SOUTHWESTERN NAVAJO COUNTIES UNTIL 1230 PM MST...

AT 1154 AM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8
MILES SOUTHEAST OF METEOR CRATER...OR 11 MILES WEST-SOUTHWEST OF
WINSLOW...MOVING NORTH AT 20 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
INTERSTATE 40 BETWEEN MILE POST 240 AND 250.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 3488 11086 3493 11101 3515 11095 3508 11071
TIME...MOT...LOC 1854Z 202DEG 15KT 3497 11090

JJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 6:08 PM MST	Areal Flood Advisory	FGZ	Navajo	112 min
Aug 1, 11:52 AM MST	Special Weather Statement	FGZ		23 min
Aug 1, 11:56 AM MST	Special Weather Statement	FGZ		34 min
Aug 1, 2:06 PM MST	Special Weather Statement	FGZ		39 min
Aug 1, 2:26 PM MST	Areal Flood Advisory	FGZ	Apache	2 hr
Aug 1, 4:28 PM MST	Areal Flood Advisory	FGZ	Apache	2 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2015 Every severe thunderstorm warning in 2015

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.