Alert archive / Arizona / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Flagstaff, AZ

July 25, 2011Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 25, 2011, 10:05 PM MDT for Navajo County, Arizona. It was in force for 40 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: Jul 25, 2011, 10:05 PM MDT (04:05 UTC)
Expired: Jul 25, 2011, 10:45 PM MDT
In force: 40 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon

County Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 92 km from the middle of the area, began a volume at 04:08 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 00:00Z, 4.1 hours before the alert went out and 156 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1708 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

225 
WUUS55 KFGZ 260405
SVRFGZ
AZC017-260445-
/O.NEW.KFGZ.SV.W.0021.110726T0405Z-110726T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
905 PM MST MON JUL 25 2011

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL NAVAJO COUNTY IN NORTHEAST ARIZONA...

* UNTIL 945 PM MST

* AT 903 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  MILEPOST 375 ON SR 77...OR 33 MILES NORTH OF SHOW LOW...AND MOVING
  NORTHWEST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILEPOST 380 ON SR 77 BY 915 PM MST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WARNING IS ISSUED FOR STORMS PRODUCING HAIL 1
INCH DIAMETER OR LARGER...AND/OR WINDS GREATER THAN 57 MPH.

&&

LAT...LON 3473 11030 3481 11016 3470 11006 3457 11023
TIME...MOT...LOC 0405Z 143DEG 9KT 3471 11018

$$

41

2 follow-up statements

026 
WWUS55 KFGZ 260425
SVSFGZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
925 PM MST MON JUL 25 2011

AZC017-260445-
/O.CON.KFGZ.SV.W.0021.000000T0000Z-110726T0445Z/
NAVAJO AZ-
925 PM MST MON JUL 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM MST
FOR CENTRAL NAVAJO COUNTY...

AT 917 PM MST...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF 
PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS TO 60 MPH.  THIS 
STORM WAS LOCATED NEAR MILEPOST 375 ON SR 77...OR 35 MILES SOUTHEAST 
OF WINSLOW...MOVING NORTHWEST AT 10 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE 
DAMAGING HAIL. WIND GUSTS TO 55 MPH WERE MEASURED AT 14 MILE HILL ON 
STATE ROUTE 77. 

SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS.

&&

LAT...LON 3473 11030 3481 11016 3470 11006 3457 11023
TIME...MOT...LOC 0423Z 143DEG 9KT 3475 11021

$$
41

524 
WWUS55 KFGZ 260448
SVSFGZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
948 PM MST MON JUL 25 2011

AZC017-260455-
/O.EXP.KFGZ.SV.W.0021.000000T0000Z-110726T0445Z/
NAVAJO AZ-
948 PM MST MON JUL 25 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL NAVAJO COUNTY HAS 
EXPIRED...

RADAR INDICATED THE THUNDERSTORM NEAR MILEPOST 375 ON STATE ROUTE 77 
WAS NO LONGER PRODUCING ONE INCH HAIL. THUS THE SEVERE THUNDERSTORM 
WARNING HAS EXPIRED. 

VERY HEAVY RAINFALL WILL CONTINUE ACROSS CENTRAL NAVAJO COUNTY LATE 
THIS EVENING. 

LAT...LON 3473 11030 3481 11016 3470 11006 3457 11023
TIME...MOT...LOC 0425Z 143DEG 9KT 3475 11021

$$

41

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:03 PM MDT	Areal Flood Advisory	FGZ	Apache	117 min
Jul 25, 6:34 PM MDT	Severe Thunderstorm Warning	FGZ	Apache, Navajo	41 min
Jul 25, 6:40 PM MDT	Severe Thunderstorm Warning	FGZ	Coconino, Navajo	35 min
Jul 25, 7:15 PM MDT	Severe Thunderstorm Warning	FGZ	Navajo	30 min
Jul 25, 7:31 PM MDT	Areal Flood Advisory	FGZ	Apache, Navajo	74 min
Jul 25, 7:39 PM MDT	Flash Flood Warning	FGZ	Apache, Navajo	111 min
Jul 25, 7:56 PM MDT	Flash Flood Warning	FGZ	Navajo	3 hr
Jul 25, 8:02 PM MDT	Flash Flood Warning	FGZ	Navajo	84 min
Jul 25, 8:29 PM MDT	Severe Thunderstorm Warning	FGZ	Gila, Navajo	33 min
Jul 25, 9:59 PM MDT	Special Weather Statement	FGZ		46 min
Jul 25, 10:35 PM MDT	Areal Flood Advisory	FGZ	Navajo	2 hr
Jul 25, 11:22 PM MDT	Areal Flood Advisory	FGZ	Navajo	53 min
Jul 26, 4:42 AM MDT	Flash Flood Watch	FGZ	Apache, Coconino, Navajo	15 hr
Jul 26, 1:01 PM MDT	Flash Flood Warning	FGZ	Apache	119 min
Jul 26, 3:08 PM MDT	Flash Flood Warning	FGZ	Coconino	4 hr
Jul 26, 3:48 PM MDT	Special Weather Statement	FGZ	Apache	57 min
Jul 26, 4:09 PM MDT	Areal Flood Advisory	FGZ	Apache	42 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2011 Every severe thunderstorm warning in 2011

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.