Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 35, NWS Flagstaff, AZ

August 30, 2012Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 30, 2012, 2:29 PM MST for Coconino 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 30, 2012, 2:29 PM MST (21:29 UTC)
Expired
Aug 30, 2012, 5:30 PM MST
In force
3 hr
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon
Flood severity
None

County Coconino County, AZ

The radar

The Cedar City radar (KICX), 154 km from the middle of the area, began a volume at 21:31 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, 9.5 hours before the alert went out and 184 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, Flgstf/Belemont, AZ at 12:00Z on 2012-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 93 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2012-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
93 J/kg
Mixed-layer CIN
-131 J/kg
Mixed-layer LCL
2049 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
70 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.

255 
WGUS55 KFGZ 302129
FFWFGZ
AZC005-310030-
/O.NEW.KFGZ.FF.W.0035.120830T2129Z-120831T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
229 PM MST THU AUG 30 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITY OF ANTELOPE CANYON NEAR SR 98...

* UNTIL 530 PM MST

* AT 223 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
HEAVY RAIN FROM A THUNDERSTORM OVER THE ANTELOPE CANYON DRAINAGE 
AREA THAT WILL PRODUCE FLASH FLOODING. RAPID RISES ALONG ANTELOPE 
CREEK AND THROUGH ANTELOPE CANYON ARE LIKELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
ANTELOPE CREEK AND PEACH WASH.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3696 11144 3695 11139 3668 11126 3670 11144

$$

OUTLER
2 follow-up statements
127 
WGUS55 KFGZ 302133 CCA
FFWFGZ
AZC005-310030-
/O.COR.KFGZ.FF.W.0035.120830T2129Z-120831T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
229 PM MST THU AUG 30 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA...  
  THIS INCLUDES ANTELOPE CANYON NEAR SR 98...

* UNTIL 530 PM MST

* AT 223 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
HEAVY RAIN FROM A THUNDERSTORM OVER THE ANTELOPE CANYON DRAINAGE 
AREA THAT WILL PRODUCE FLASH FLOODING. RAPID RISES ALONG ANTELOPE 
CREEK AND THROUGH ANTELOPE CANYON ARE LIKELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
ANTELOPE CREEK AND PEACH WASH.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3696 11144 3695 11139 3668 11126 3670 11144

$$

OUTLER
502 
WGUS75 KFGZ 310024
FFSFGZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
524 PM MST THU AUG 30 2012

AZC005-310032-
/O.EXP.KFGZ.FF.W.0035.000000T0000Z-120831T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCONINO AZ-
524 PM MST THU AUG 30 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 530 PM MST FOR NORTH
CENTRAL COCONINO COUNTY...

HEAVY RAIN WHICH PROMPTED THE FLASH FLOOD WARNING FOR THE ANTELOPE 
CANYON DRAINAGE BASIN HAS EXITED THE AREA...NO REPORTS OF FLOODING 
WERE RECEIVED. 

LAT...LON 3696 11144 3695 11139 3668 11126 3670 11144

$$

OUTLER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 29, 9:23 PM MSTSpecial Weather StatementFGZ22 min
Aug 29, 11:12 PM MSTSpecial Weather StatementFGZ48 min
Aug 30, 12:17 PM MSTSpecial Weather StatementFGZYavapai28 min
Aug 30, 1:03 PM MSTSpecial Weather StatementFGZGila27 min
Aug 30, 1:40 PM MSTAreal Flood AdvisoryFGZGila2 hr
Aug 30, 2:12 PM MSTAreal Flood AdvisoryFGZYavapai3 hr
Aug 30, 3:19 PM MSTAreal Flood AdvisoryFGZGila3 hr

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.