Alert archive / Arizona / Flash Flood Warnings in 2001

Flash Flood Warning 10, NWS Flagstaff, AZ

August 9, 2001Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 9, 2001, 10:26 PM MST for Coconino County, Arizona. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 9, 2001, 10:26 PM MST (05:26 UTC)
Expired: Aug 10, 2001, 12:30 AM MST
In force: 2 hr
Issued by: NWS Flagstaff, AZ
Area: Whole counties

County Coconino County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 5.4 hours before the alert went out and 68 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: 965 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1265 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS55 KFGZ 100530
FFWFLG
AZC005-100830-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1026 PM MST THU AUG 9 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 130 AM MST

* AT 1026 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
HEAVY RAINFALL OVER THE CATARACT CREEK DRAINAGE WHICH FLOWS INTO THE 
HAVASUPAI INDIAN RESERVATION. THE PUBLIC REPORTED INCREASING WATER 
IN CATERACT CREEK IN SUPAI AND MORE WATER WILL BE FLOWING DOWNSTREAM 
FROM ADDITIONAL RUNOFF. 

* THE THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL MOVE SLOWLY TO THE 
SOUTH OVER...
RURAL NORTHWESTERN COCONINO COUNTY

FLOOD WATERS ARE MOVING DOWN CATARACT CREEK FROM THE NORTHERN 
PORTION OF THE COCONINO PLATEAU INTO SUPAI. SEEK HIGHER GROUND 
IMMEDIATELY

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. 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. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

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

STAUDENMAIER

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Flagstaff, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 9, 9:00 PM MST, 1 hour 26 minutes earlier.

Area forecast discussion, Aug 9, 9:00 PM MST, 1 hour 26 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
900 PM MST THU AUG 09 2001

.SYNOPSIS...NORTHEASTERLY FLOW BETWEEN LOW PRESSURE OVER NEW MEXICO
AND HIGH PRESSURE OVER UTAH AND WESTERN ARIZONA WILL CONTINUE THE
THREAT OF SHOWERS AND THUNDERSTORMS TONIGHT. THE LOW PRESSURE
SYSTEM WILL BEGIN TO WEAKEN ON FRIDAY WITH HIGH PRESSURE
STRENGTHENING OVER SOUTHERN CALIFORNIA. THIS WILL ALLOW A DRIER AND
WARMER NORTHWEST FLOW TO DEVELOP ON FRIDAY AND SATURDAY. HIGH
PRESSURE WILL GRADUALLY SHIFT TO THE FOUR CORNERS AREA BY EARLY NEXT
WEEK WITH ENOUGH MOISTURE FOR A CONTINUING CHANCE OF SHOWERS AND
THUNDERSTORMS.

.DISCUSSION...RADAR AND IR IMAGERY CONTINUE TO SHOW REDEVELOPMENT
AHEAD OF MCS OVER YAVAPAI COUNTY. HOWEVER...ACTIVITY BEGINNING TO
WEAKEN SOMEWHAT FROM THE ECHO TOPS OF 55+ KFT SEEN EARLIER THIS
EVENING. EXPECT THIS ACTIVITY TO CONTINUE TO PUSH TO THE SOUTHWEST
FOR THE NEXT SEVERAL HOURS. OTHER SHOWERS AND THUNDERSTORMS CONTINUE
TO FLARE UP IN THE UNSTABLE AIRMASS ESPECIALLY OVER THE NORTHERN AND
EASTERN PORTIONS OF THE CWA. 00Z KFGZ SOUNDING HAD -6 LI WITH AMPLE
CAPE FOR STORMS TO CONTINUE TO DEVELOP OFF AND ON THROUGH THE NIGHT.
DO NOT EXPECT A REPEAT OF LAST NIGHT WITH COMPLEX FROM CO MOVING
INTO NORTHERN ARIZONA AFTER MIDNIGHT. EXPECT MUCH OF THE ACTIVITY TO
DECREASE BY MIDNIGHT WITH ONLY ISOLATED SHOWERS AND THUNDERSTORMS
AFTER THAT.

LOW PRESSURE TROUGH APPEARS TO BE SHEARING OUT AND MOVING EAST
ALLOWING HIGH PRESSURE TO BUILD MORE OVER NORTHERN ARIZONA. MODELS
INDICATE SIGNIFICANT NORTHEAST FLOW AGAIN TOMORROW WITH GENERALLY
THE SAME AMOUNT OF LOW-LEVEL MOISTURE AND INSTABILITY FOR TERRAIN
FORCED THUNDERSTORMS TO SWEEP OVER YAVAPAI AND GILA COUNTIES OVER
THE AFTERNOON AND EVENING HOURS AGAIN WITH A THREAT OF CONVECTION IN
UTAH MOVING INTO THE NORTHERN ZONES IN THE EVENING. WILL UPDATE THE
FIRST PERIOD TO REFLECT CURRENT AND EXPECTED SITUATION TONIGHT...AND
WILL LET MIDNIGHT SHIFT CONSIDER INCREASING POPS FOR TOMORROW OVER
THE ABOVE MENTIONED AREAS. STAUDENMAIER

.FGZ...NONE.

In the hours before

Local storm report, Aug 9, 9:06 PM MST, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED TIME OF EVENT
NATIONAL WEATHER SERVICE FLAGSTAFF ARIZONA
0906 PM MST THU AUG 9 2001

TIME (MST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1236 PM    FLAGSTAFF                 AZ   0.75 INCH HAIL
08/09/01   COCONINO                       NATIONAL WEATHER SERVICE EMPLOYEE
                                          REPORTED 0.75 INCH HAIL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 5:11 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	34 min
Aug 10, 11:12 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	33 min
Aug 10, 1:34 PM MST	Severe Thunderstorm Warning	FGZ	Gila	36 min

Nearby

Flash Flood Warnings in Arizona, 2001 Every flash flood warning in 2001

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.