Alert archive / Arizona / Flash Flood Warnings in 2008

Flash Flood Warning 13, NWS Flagstaff, AZ

August 10, 2008Coconino County, Navajo County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 10, 2008, 4:28 PM MST for Coconino County, Navajo 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 10, 2008, 4:28 PM MST (23:28 UTC)
Expired: Aug 10, 2008, 7:30 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Flood severity: None

Counties Coconino County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 52 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 104 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: 287 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1146 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 8 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.

000 
WGUS55 KFGZ 102332
FFWFGZ
AZC005-017-110230-
/O.NEW.KFGZ.FF.W.0013.080810T2328Z-080811T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
428 PM MST SUN AUG 10 2008

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME SOUTHEASTERN COCONINO COUNTY IN NORTH CENTRAL ARIZONA...
  WEST CENTRAL NAVAJO COUNTY IN NORTHEAST ARIZONA...

* UNTIL 730 PM MST

* AT 420 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM THUNDERSTORMS OVER EAST CLEAR CREEK NEAR 
  CHEVELON BUTTE.

* THESE STORMS HAVE PRODUCED 1 TO 2 INCHES OF RAINFALL WITH LOCALLY 
  HEAVIER AMOUNTS OVER THE EAST CLEAR CREEK WATERSHED.

FLOOD WATERS ARE MOVING DOWN EAST CLEAR CREEK. AT 420 PM...THE 
HEAVIEST RAINFALL WAS LOCATED ABOUT 20 MILES SOUTHWEST OF MACHOOD 
PARK. FLOOD WATERS MAY TAKE SEVERAL HOURS TO MOVE DOWNSTREAM TO 
THIS RESERVOIR.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. DO 
NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH.

LAT...LON 3499 11067 3495 11063 3466 11082 3472 11093

$$

1 follow-up statement

000 
WGUS75 KFGZ 110232
FFSFGZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
721 PM MST SUN AUG 10 2008

AZC005-017-110231-
/O.EXP.KFGZ.FF.W.0013.000000T0000Z-080811T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NAVAJO AZ-COCONINO AZ-
729 PM MST SUN AUG 10 2008

...THE FLASH FLOOD WARNING FOR EAST CLEAR CREEK WILL EXPIRE AT 730 
PM MST FOR EXTREME SOUTHEASTERN COCONINO AND EXTREME WEST CENTRAL 
NAVAJO COUNTIES...

THE HEAVY RAINFALL ABOUT 20 MILES SOUTHWEST OF MACHOOD PARK HAS 
ENDED. THE RUNOFF FROM THIS RAIN WILL CONTINUE TO MOVE DOWN EAST 
CLEAR CREEK AND SPREAD OUT AS IT MOVES INTO EAST CLEAR CREEK  
RESERVOIR. 

LAT...LON 3499 11067 3495 11063 3466 11082 3472 11093

$$

MAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 6:55 PM MST	Areal Flood Advisory	FGZ	Apache, Gila, Navajo	2 hr
Aug 10, 2:57 PM MST	Areal Flood Advisory	FGZ	Coconino	2 hr

Nearby

Flash Flood Warnings in Arizona, 2008 Every flash flood warning in 2008

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.