Alert archive / Arizona / Flash Flood Warnings in 1999

Flash Flood Warning 21, NWS Flagstaff, AZ

August 30, 1999Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 30, 1999, 3:34 PM MST for Coconino County, Arizona. It was in force for 116 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
Aug 30, 1999, 3:34 PM MST (22:34 UTC)
Expired
Aug 30, 1999, 5:30 PM MST
In force
116 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 22:37 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, 10.6 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 1999-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 41 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 1999-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 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
41 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
1094 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
47 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 302238
FFWFLG
AZC005-310030-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
334 PM MST MON AUG 30 1999

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

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

* UNTIL 530 PM MST

* AT 330 PM MST...FLAGSTAFF DOPPLER RADAR INDICATED STRONG
THUNDERSTROMS EXTENDING FROM NEAR SUPAI NORTHWARD ACROSS THE GRAND
CANYON TO THE PORTIONS OF THE KANAB CREEK WILDERNESS. RADAR
RAINFALL ESTIMATES ARE INDICATING THAT 1.5 TO 3.0 INCHES OF RAIN
HAVE OCCURRED ACROSS THIS AREA SINCE 230 PM MST. SIDE CANYONS
ALONG THE WESTERN END OF THE GRAND CANYON NEAR SUPAI ARE LIKELY
FLOODING AS WELL AS OTHER WASHES ACROSS THE WARNED AREA.

*STORMS ARE EXPECTED TO CONTINUE THROUGH 400 PM WITH ADDITIONAL
HEAVY RAINFALL EXPECTED.


IF YOU ARE IN THE WARNING AREA...MOVE TO HIGHER GROUND AT ONCE.
DO NOT DRIVE ACROSS WATER COVERED ROADS. AVOID ALL AREAS SUBJECT
TO FLOODING.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 1:48 PM MSTFlash Flood WarningFGZGila3 hr

Nearby

Flash Flood Warnings in Arizona, 1999Every flash flood warning in 1999

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.