Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Flagstaff, AZ

August 21, 2012Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 21, 2012, 3:27 PM MST for Gila County, Arizona. It was in force for 33 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 21, 2012, 3:27 PM MST (22:27 UTC)
Expired: Aug 21, 2012, 4:00 PM MST
In force: 33 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 51 km from the middle of the area, began a volume at 22:27 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

Phoenix, AZ (KPSR), launched 12:00Z, 10.5 hours before the alert went out and 134 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: 931 J/kg
Mixed-layer CIN: -180 J/kg
Mixed-layer LCL: 1715 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 35 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.

612 
WUUS55 KFGZ 212227
SVRFGZ
AZC007-212300-
/O.NEW.KFGZ.SV.W.0039.120821T2227Z-120821T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
327 PM MST TUE AUG 21 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL GILA COUNTY IN EAST CENTRAL ARIZONA...

* UNTIL 400 PM MST

* AT 322 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED OVER NORTH CENTRAL GILA COUNTY...OR 11 MILES     
  SOUTH OF FOREST LAKES...AND MOVING NORTHEAST AT 15 MPH. THIS STORM 
  IS OVER THE WESTERN PORTION OF THE POCO FIRE AREA. EXPECT RISES IN 
   CHERRY CREEK.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHERN GILA COUNTY AT 340 PM MST

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS THUNDERSTORM IS ALSO PRODUCING HEAVY RAINFALL. THIS RAINFALL
WILL LEAD TO RAPID RISES ON AREA STREAMS AND CREEKS.

&&

LAT...LON 3426 11085 3419 11076 3412 11090 3421 11097
TIME...MOT...LOC 2225Z 229DEG 14KT 3420 11087

$$
MAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 5:45 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Aug 20, 9:06 PM MST	Flash Flood Warning	FGZ	Coconino	9 hr
Aug 21, 1:07 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Aug 21, 1:16 PM MST	Flash Flood Warning	FGZ	Yavapai	119 min
Aug 21, 1:51 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	24 min
Aug 21, 2:19 PM MST	Special Weather Statement	FGZ		26 min
Aug 21, 2:45 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	30 min
Aug 21, 2:46 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Aug 21, 2:59 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Navajo	31 min
Aug 21, 3:29 PM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Aug 21, 3:37 PM MST	Severe Thunderstorm Warning	FGZ	Gila	23 min
Aug 21, 3:47 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Aug 21, 3:53 PM MST	Flash Flood Warning	FGZ	Gila	4 hr
Aug 21, 4:05 PM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Aug 21, 4:08 PM MST	Areal Flood Advisory	FGZ	Navajo	3 hr
Aug 21, 4:09 PM MST	Severe Thunderstorm Warning	FGZ	Gila	36 min
Aug 21, 4:54 PM MST	Special Weather Statement	FGZ	Gila	66 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2012 Every severe thunderstorm warning in 2012

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.