Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 13, NWS Flagstaff, AZ

July 31, 2012Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 31, 2012, 8:00 PM MST for Coconino County, Arizona. It was in force for 6 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: Jul 31, 2012, 8:00 PM MST (03:00 UTC)
Expired: Aug 1, 2012, 2:00 AM MST
In force: 6 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Flood severity: None

County Coconino County, AZ

The radar

The Cedar City radar (KICX), 173 km from the middle of the area, began a volume at 03:03 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, 3.0 hours before the alert went out and 115 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: 76 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1618 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 23 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.

478 
WGUS55 KFGZ 010300
FFWFGZ
AZC005-010900-
/O.NEW.KFGZ.FF.W.0013.120801T0300Z-120801T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
800 PM MST TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA...

* UNTIL 200 AM MST WEDNESDAY

* AT 750 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM EARLIER THUNDERSTORMS OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE        
  VILLAGE OF SUPAI AND AREA CAMPGROUND. HIGH WATER REPORTED IN THE   
  SUPAI AREA WILL CONTINUE TO RISE AS ADDITIONAL FLOODWATERS FROM    
  CATARACT CREEK MOVE INTO THE AREA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOOD WATERS ARE MOVING DOWN CATARACT CREEK TOWARDS SUPAI.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
FLAGSTAFF.

&&

LAT...LON 3628 11283 3637 11252 3581 11230 3581 11246
      3573 11259

$$

OUTLER

1 follow-up statement

807 
WGUS75 KFGZ 010854
FFSFGZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
154 AM MST WED AUG 1 2012

AZC005-010901-
/O.EXP.KFGZ.FF.W.0013.000000T0000Z-120801T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCONINO AZ-
154 AM MST WED AUG 1 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 200 AM MST FOR WEST CENTRAL
COCONINO COUNTY...

HIGH WATER LEVELS ALONG THE HAVASU CREEK DRAINAGE WILL CONTINUE TO 
RECEDE THIS EVENING. NO ADDITIONAL HEAVY RAINFALL IS EXPECTED.

LAT...LON 3628 11283 3637 11252 3581 11230 3581 11246
      3573 11259

$$

RB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 6:07 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Jul 31, 6:54 PM MST	Special Weather Statement	FGZ		36 min
Jul 31, 7:14 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	31 min
Jul 31, 7:31 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Aug 1, 7:09 AM MST	Areal Flood Advisory	FGZ	Coconino	6 hr
Aug 1, 12:18 PM MST	Areal Flood Advisory	FGZ	Coconino, Navajo	4 hr
Aug 1, 3:16 PM MST	Areal Flood Advisory	FGZ	Coconino	4 hr

Nearby

Flash Flood Warnings in Arizona, 2012 Every 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.