Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 28, NWS Las Vegas, NV

August 23, 1998Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 23, 1998, 11:15 PM MST for Mohave 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 23, 1998, 11:15 PM MST (06:15 UTC)
Expired: Aug 24, 1998, 2:00 AM MST
In force: 3 hr
Issued by: NWS Las Vegas, NV
Area: Whole counties

County Mohave County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 6.3 hours before the alert went out and 185 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2680 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 80 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 KLAS 240617
FFWLAS
AZC015-240900-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1115 PM PDT (1115 PM MST) SUN AUG 23 1998


*  FLASH FLOOD WARNING FOR
   CENTRAL AND SOUTH CENTRAL MOHAVE COUNTY IN NORTHWESTERN ARIZONA

*  UNTIL 200 AM MST (200 AM PDT)

*  SOME LOCATIONS AFFECTED
   KINGMAN
   VALENTINE
   TRUXTON
   WIKIEUP
   HIGHWAY 93

*  AT 1110 MST...RADAR ESTIMATED RAINFALL RATES OF UP TO TWO INCHES
DURING THE PAST TWO HOURS OVER THE AREA BETWEEN TRUXTON AND
INTERSTATE 40 AND BETWEEN THE HUALAPAI MOUNTAINS AND HIGHWAY 93.
AS A RESULT... FLASH FLOODING IS LIKELY OCCURRING OR IMMINENT
IN THE WARNING LOCATIONS...ESPECIALLY THE IN THE VICINITY OF
THE TRUXTON WASH AND THE BIG SANDY RIVER.


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 ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING. IT IS VERY DIFFICULT
AT NIGHT TO TELL HOW MUCH WATER IS ON ROADS. MOTORISTS SHOULD NOT
DRIVE THROUGH WATER OF UNKNOWN DEPTH.

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 Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Aug 23, 9:00 PM MST, 2 hours 15 minutes earlier.

Area forecast discussion, Aug 23, 9:00 PM MST, 2 hours 15 minutes before

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
900 PM PDT SUN AUG 23 1998

SYNOPSIS...AN AREA OF HIGH PRESSURE WILL SETTLE NEAR THE FOUR CORNERS
MONDAY PROVIDING MONSOONAL MOISTURE TO THE MOHAVE DESERT. THIS
MOISTURE COMBINED WITH DAYTIME HEATING WILL SPAWN ISOLATED TO
SCATTERED SHOWERS AND THUNDERSTORMS ACROSS PORTIONS OF SOUTHEAST
CALIFORNIA...EXTREME SOUTHERN NEVADA AND NORTHWEST ARIZONA.
THEN A DRY WESTERLY FLOW WILL WORKS ITS WAY THROUGH THE REGION FROM
NORTHWEST TO SOUTHEAST THROUGH THE END OF THE WEEK.

DISCUSSION...SATELLITE SHOWING A FEW STORMS OVER NORTHERN MOHAVE
COUNTY ATTM. EXPECT THESE STORMS TO DECREASE OVERNIGHT.
NEW ETA SHOWING A LITTLE INCREASE IN 700 AND 500 MB MOISTURE OVER
THE NEXT 12 TO 18 HOURS. WITH YUMA VAD SHOWING SOUTHWEST WINDS NOW
DONT EXPECT AS BIG OF AN INCREASE IN MONSOONAL MOISTURE AS EARLYER
BUT THE POTENTAL IS STILL ENOUGHT TO WARRENT SLIGHT CHANCES IN MOST
OF SOUTHERN ZONES ON MONDAY. WITH TROUGH MOVING IN BY TUESDAY A
STRONG SOUTHWEST FLOW RETURNS AND WILL PUSH MOISTURE BACK INTO OUR
SOUTHEASTERN ZONES. THIS TROUGH WILL SIT OVER THE SOUTHWESTERN U.S.
KEEPING MOST OF THE ZONES BREEZY AND DRY.  WILL UPDATE TO REMOVE
EVENING METIONS. LAS 0120. DALEY

Nearby

Flash Flood Warnings in Arizona, 1998 Every flash flood warning in 1998

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.