Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 20, NWS Flagstaff, AZ

August 20, 2012Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 20, 2012, 3:58 PM MST for Yavapai County, Arizona. It was in force for 3 hr. 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 20, 2012, 3:58 PM MST (22:58 UTC)
Expired
Aug 20, 2012, 7:00 PM MST
In force
3 hr
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon
Flood severity
None

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 109 km from the middle of the area, began a volume at 22:59 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, 11.0 hours before the alert went out and 101 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-pSkew-T log-p diagram, Phoenix, AZ at 12:00Z on 2012-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 478 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phoenix, AZ at 12:00Z on 2012-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
478 J/kg
Mixed-layer CIN
-232 J/kg
Mixed-layer LCL
1794 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
-5 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.

331 
WGUS55 KFGZ 202258
FFWFGZ
AZC025-210200-
/O.NEW.KFGZ.FF.W.0020.120820T2258Z-120821T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
358 PM MST MON AUG 20 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL YAVAPAI COUNTY IN WEST CENTRAL ARIZONA...

* UNTIL 700 PM MST

* AT 354 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAIN FROM A THUNDERSTORM OVER THE GLADIATOR FIRE AREA. 

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
TURKEY CREEK...POLAND CREEK...TOWERS CREEK...CRAZY BASIN CREEK...WOLF
CREEK...BEAR CREEK...TUSCUMBIA CREEK...PINE CREEK...ARRASTRA CREEK
AND MINNEHAHA CREEK.

THE HEAVY RAIN WILL LIKELY TRIGGER LIFE-THREATENING FLASH FLOODS...AS
WELL AS MUDSLIDES...ROCKSLIDES...AND DEBRIS FLOWS WITHIN AND
DOWNSTREAM OF THE GLADIATOR FIRE BURN AREA. ROADWAYS IN THE AREA WILL
LIKELY BE INUNDATED AND WASHED OUT. STREAMS IN THE AREA WILL FLOW FAR
ABOVE TYPICAL LEVELS AND WILL CARRY HEAVY AMOUNTS OF SEDIMENT.

AREAS IMPACTED BY THIS WARNING INCLUDE THE GLADIATOR FIRE BURN
AREA...THE COMMUNITY OF CROWN KING...CROWN KING ROAD...SENATOR
HIGHWAY...AND POTENTIALLY SECTIONS OF WAGONER ROAD.

&&

LAT...LON 3434 11237 3432 11225 3419 11228 3422 11241

$$

MAS
1 follow-up statement
594 
WGUS75 KFGZ 210158
FFSFGZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
658 PM MST MON AUG 20 2012

AZC025-210206-
/O.EXP.KFGZ.FF.W.0020.000000T0000Z-120821T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
YAVAPAI AZ-
658 PM MST MON AUG 20 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 700 PM MST FOR SOUTH
CENTRAL YAVAPAI COUNTY...

HEAVY RAIN FROM A THUNDERSTORM OVER THE GLADIATOR FIRE AREA HAS 
ENDED AND THE WARNING WILL BE ALLOWED TO EXPIRE.  

LAT...LON 3434 11237 3432 11225 3419 11228 3422 11241

$$

MAS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 5:27 PM MSTSpecial Weather StatementFGZGila48 min
Aug 19, 6:21 PM MSTFlash Flood WarningFGZCoconino13 hr
Aug 19, 7:32 PM MSTAreal Flood AdvisoryFGZYavapai118 min
Aug 20, 1:16 PM MSTAreal Flood AdvisoryFGZApache2 hr
Aug 20, 2:15 PM MSTAreal Flood AdvisoryFGZCoconino, Navajo3 hr
Aug 20, 4:17 PM MSTSpecial Weather StatementFGZ43 min

Nearby

Flash Flood Warnings in Arizona, 2012Every flash flood 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.