Alert archive / Arizona / Flash Flood Warnings in 1997

Flash Flood Warning 3, NWS Flagstaff, AZ

August 3, 1997Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 3, 1997, 12:46 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 counties it named.

The facts

Issued
Aug 3, 1997, 12:46 PM MST (19:46 UTC)
Expired
Aug 3, 1997, 3:45 PM MST
In force
3 hr
Issued by
NWS Flagstaff, AZ
Area
Whole counties

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 19:45 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, 7.8 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 1997-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 43 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 1997-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
43 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1416 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
25 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 
TTAA00 KFLG 031948
FFWFLG
AZC005-032245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1246 PM MST SUN AUG 3 1997

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 345 PM MST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTH CENTRAL ARIZONA

   ...EASTERN COCONINO COUNTY
 
AT 1245 PM MST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM WITH VERY HEAVY RAIN OVER EASTERN COCONINO COUNTY.
THIS THUNDERSTORM WAS LOCATED 8 MILES SOUTHWEST OF LEUPP NEAR
CANYON DIABLO AND WAS MOVING TO THE NORTHWEST AT 10 MILES AN HOUR.
DOPPLER RADAR INDICATED THAT HEAVY RAIN WAS FALLING IN THE SAN
FRANCISCO WASH.

RESIDENTS IN AND AROUND LEUPP SHOULD MONITOR CONDITIONS ALONG SAN
FRANCISCO WASH. MOVE TO HIGHER GROUND IF FLOOD WATERS THREATEN...
DO NOT DRIVE YOUR VEHICLE ACROSS FLOODED ROADWAYS.

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 3, 9:14 AM MST, 3 hours 32 minutes earlier.

Area forecast discussion, Aug 3, 9:14 AM MST, 3 hours 32 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
900 AM MST SUN AUG 03 1997

COPIOUS AMOUNTS OF MOISTURE CONTINUES TO WORK INTO THE CWA FROM THE
SOUTH. WATER VAPOR IMAGERY INDICATING UPPER LEVEL DISTURBANCE OVER
SOUTH CENTRAL AZ AT THIS TIME. A QUICK LOOK AT 12Z ETA-RUC APPEARS TO
HAVE PICKED UP ON THIS FEATURE IN ITS INITIALIZATION AT THE 5H
LEVEL...BUT IS PLACEMENT MAY BE A BIT TOO FAR TO THE NORTH. PREFER
NGM INITIALIZATION THIS MORNING. NGM TAKES THIS FEATURE SLOWLY TO THE
NORTHWEST INTO CENTRAL AZ...WITH THE ETA TRACKING IT INTO SOUTHERN CA
AND NV. APPEARS FROM WATER VAPOR IMAGERY THIS FEATURE WILL HEAD RIGHT
UP THE COLORADO RIVER VALLEY. WITH THE MOISTURE ALREADY IN PLACE...
THIS FEATURE PROVIDING ENOUGH DYNAMICS TO PRODUCE LARGE AREA OF
SHOWER ACTIVITY WITH EMBEDDED THUNDERSTORMS OVER YAVAPAI COUNTY.
LOOKING AT POSSIBILITY OF EXTENDING FLASH FLOOD WATCHES TO YAVAPAI
COUNTY...WITH RAINFALL RECEIVED FROM LAST NIGHT...IF ANY ADDITIONAL
HEAVY SHOWERS DEVELOP...IT COULD BE THAT FLASH FLOODING WILL BECOME
GOOD POSSIBILITY. NOTED SPC PLACED PORTIONS OF COUNTY UNDER SLIGHT
RISK TODAY AS WELL. FOR NOW...HAVE UPDATED ZONES INCREASING POPS AS
NEEDED.

FOR THE REST OF THE CWA...ANY SHOWER OR THUNDERSTORM THAT DEVELOPS
WILL NEEDED TO BE SFC HEATING INDUCED AS DYNAMIC KICKER NOT REALLY
PRESENT. NOTED SOME CLEARING TO BEGIN OVER NE AZ...IF THIS TREND
CONTINUES...THEN AFT SHOWER AND THUNDERSTORM ACTIVhITY SHOULD BEGIN ON
SCHEDULE TODAY...BEGINNING WITH THE HIGHEST ELEVATIONS FIRST. TEMPS
LOOKING GOOD ACROSS THE CWA...ALTHOUGH SOME LOCATIONS MAY NOT QUITE
GET AS WARM AS FORECAST WITH THE CLOUD COVER IN PLACE.
FLG 645  INW 524
FLG...NONE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 7:00 PM MSTSevere Thunderstorm WarningFGZNavajo30 min
Aug 3, 11:27 AM MSTSevere Thunderstorm WarningFGZCoconino58 min
Aug 3, 12:17 PM MSTSevere Thunderstorm WarningFGZNavajo48 min
Aug 3, 3:08 PM MSTFlash Flood WarningFGZNavajo117 min
Aug 3, 3:53 PM MSTFlash Flood WarningFGZCoconino2 hr
Aug 3, 4:51 PM MSTFlash Flood WarningFGZNavajo5 hr

Nearby

Flash Flood Warnings in Arizona, 1997Every flash flood warning in 1997

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.