Alert archive / Arizona / Flash Flood Warnings in 1997

Flash Flood Warning 53, NWS Flagstaff, AZ

October 2, 1997Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Oct 2, 1997, 3:26 PM MST for Coconino County, Arizona. It was in force for 119 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 2, 1997, 3:26 PM MST (22:26 UTC)
Expired
Oct 2, 1997, 5:25 PM MST
In force
119 min
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 22:25 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, 10.4 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 1997-10-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 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 1997-10-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 square meters per square second.193958Sfc1 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
58 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1204 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
155 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFLG 022226
FFWFLG
AZC005-030025-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
326 PM MST THU OCT 2 1997

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 525 PM MST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTH CENTRAL ARIZONA

   ...NORTHERN COCONINO COUNTY
 
AT 325 PM MST...DOPPLER RADAR SHOWED STRONG THUNDERSTORMS
FOLLOWING ONE ANOTHER IN A NORTHEASTERLY DIRECTION ACROSS NORTHERN
COCONINO COUNTY PRODUCING VERY HEAVY RAINFALL. FLASH FLOODING OF
AREAS NEAR GLEN CANYON IS LIKELY WITHIN THE NEXT TWO HOURS.

AREAS IN THE FLASH FLOOD WARNING INCLUDE...PARIA CANYON AND LEES
FERRY.
 
IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UPHILL TO ESCAPE
FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER
BEGINS RISING.

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 Oct 2, 2:24 PM MST, 1 hour 2 minutes earlier.

Area forecast discussion, Oct 2, 2:24 PM MST, 1 hour 2 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
220 PM MST THU OCT 2 1997

NWR SYNOPSIS...A STRONG TROUGH OF LOW PRESSURE CONTINUES TO PUSH INTO
THE GREAT BASIN. THE TRAILING EDGE OF THIS TROUGH WILL ENTER
NORTHWEST AZ THIS EVENING AND EXIT NORTHEAST AZ ON FRIDAY. AHEAD OF
THE TROUGH...GUSTY SOUTHWEST WINDS AND SCATTERED SHOWERS AND
THUNDERSTORMS WILL CONTINUE TONIGHT OVER MOST OF NORTHERN ARIZONA. AS
THE TROUGH MOVES CLOSER TO THE STATE THIS EVENING...SOME OF THE
STORMS MAY BECOME QUITE STRONG AND PRODUCE VERY GUSTY WINDS. THE
SHOWER AND THUNDERSTORM ACTIVITY WILL TAPER OFF FROM WEST TO EAST
LATE TONIGHT AND FRIDAY AS DRIER AIR FILTERS INTO THE REGION.

DISCUSSION...IF THUNDERSTORMS GET GOING TONIGHT...COULD HAVE SOME
VERY STRONG STORMS DUE TO DECENT VERTICAL AND SPEED SHEAR CAUSED BY
THE APPROACHING TROUGH. ALREADY SOME VERY IMPRESSIVE STORMS JUST
ACROSS THE BORDER IN UTAH. QUESTION IS HOW LONG GOOD THERMODYNAMIC
SUPPORT WILL REMAIN IN PLACE...ESPECIALLY FOR SOUTHERN PORTIONS OF
THE CWA. ANOTHER THING IS SYNOPTIC WINDS AHEAD OF THIS TROUGH ALREADY
ARE QUITE STRONG...GUSTS TO 37 MPH AT IGM ALREADY...WONT TAKE MUCH
OUTFLOW FROM STORMS TO REACH SEVERE LIMITS.

OTHERWISE...PASSAGE OF THE TROUGH SHOULD SERVE TO END PRECIP FROM
WEST TO EAST TONIGHT AND FRIDAY WITH ONLY LINGERING ACTIVITY EXPECTED
IN THE FAR NORTHEAST ZONES BY TOMORROW EVENING. SATURDAY LOOKS VERY
DRY PER 12Z AVN H7-H5 RH PROGS...FLAT RIDGE OVER THE AREA AND FAST
ZONAL FLOW OVER THE PACIFIC NORTHWEST. WITH LOW LEVEL RH LAST TO
EXIT...WILL GO PARTLY CLOUDY OVER THE HIGHER TERRAIN...MOSTLY SUNNY
ELSEWHERE.

LITTLE CHANGE IN MAX TEMPS THROUGH THE PERIOD AS RIDGING QUICKLY
BUILDS INTO THE REGION. EXPECT MILD MINS TONIGHT...A BIT COOLER
FRIDAY NIGHT PER DRIER AIRMASS.

FLG 4-00  INW 3100

PASSETTI

FLG...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 2, 3:01 PM MSTSevere Thunderstorm WarningFGZCoconino44 min

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.