Alert archive / Arizona / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Flagstaff, AZ

July 8, 2011Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 8, 2011, 4:39 PM MST for Yavapai County, Arizona. It was in force for 21 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 8, 2011, 4:39 PM MST (23:39 UTC)
Expired: Jul 8, 2011, 5:00 PM MST
In force: 21 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 93 km from the middle of the area, began a volume at 23:40 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, 11.7 hours before the alert went out and 96 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: 423 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1308 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 77 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.

481 
WUUS55 KFGZ 082339
SVRFGZ
AZC025-090000-
/O.NEW.KFGZ.SV.W.0013.110708T2339Z-110709T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
439 PM MST FRI JUL 8 2011

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL YAVAPAI COUNTY IN WEST CENTRAL ARIZONA...

* UNTIL 500 PM MST

* AT 435 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.
  THIS STORM WAS LOCATED NEAR MAYER...OR 16 MILES SOUTHEAST OF
  PRESCOTT VALLEY...AND WAS NEARLY STATIONARY.

* THE SEVERE THUNDERSTORM WILL AFFECT PORTIONS OF ROUTE 69 JUST
  NORTH AND EAST OF MAYER UNTIL 500 PM MST.

LAT...LON 3448 11226 3448 11210 3436 11212 3437 11224
TIME...MOT...LOC 2338Z 182DEG 8KT 3442 11217

$$

1 follow-up statement

226 
WWUS55 KFGZ 090003
SVSFGZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
503 PM MST FRI JUL 8 2011

AZC025-090013-
/O.EXP.KFGZ.SV.W.0013.000000T0000Z-110709T0000Z/
YAVAPAI AZ-
503 PM MST FRI JUL 8 2011

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

THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED. 
HOWEVER...THIS STORM IS STILL PRODUCING SMALL HAIL AND HEAVY RAIN 
JUST WEST OF I-40...AND NORTH OF ROUTE 69.

LAT...LON 3448 11226 3448 11210 3436 11212 3437 11224
TIME...MOT...LOC 2339Z 182DEG 8KT 3442 11217

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 11:02 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	13 min
Jul 8, 12:17 PM MST	Flash Flood Warning	FGZ	Coconino	3 hr
Jul 8, 1:41 PM MST	Areal Flood Advisory	FGZ	Coconino	54 min
Jul 8, 3:15 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	15 min
Jul 8, 3:44 PM MST	Flash Flood Warning	FGZ	Apache	2 hr

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.