Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 23, NWS Las Vegas, NV

July 29, 1998Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 29, 1998, 2:05 PM MST for Mohave 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: Jul 29, 1998, 2:05 PM MST (21:05 UTC)
Expired: Jul 29, 1998, 4:05 PM MST
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Whole counties

County Mohave County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.1 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: 34 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 2101 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 9 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 292107
FFWLAS
AZC015-292305-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
205 PM PDT (205 PM MST) WED JUL 29 1998


*  FLASH FLOOD WARNING FOR
   EAST CENTRAL MOHAVE COUNTY IN NORTHWESTERN ARIZONA

*  UNTIL 405 PM MST (405 PM PDT)

*  SOME LOCATIONS AFFECTED
   HUALAPAI MOUNTAIN PARK

*  AT 205 PM...RADAR INDICATED A NEARLY STATIONARY
   THUNDERSTORM LOCATED ABOUT 15 MILES EAST OF KINGMAN ALONG
   INTERSTATE 40 EXTENDING SOUTH TO HUALAPAI MOUNTAIN PARK.
   RADAR RAINFALL ESTIMATES OF NEARLY AN INCH HAVE BEEN
   INDICATED OVER THE PAST HOUR. THESE STORMS ARE ALSO CAPABLE
   OF PRODUCING STRONG WIND GUSTS TO 50 MPH AND SMALL HAIL.

AREA RESIDENTS SHOULD MONITOR FLOOD CONDITIONS... AND BE PREPARED
TO MOVE TO HIGHER GROUND... SHOULD FLOOD WATERS THREATEN. IF FLASH
FLOODING IS OBSERVED... ACT QUICKLY. MOVE TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

KOSIER

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 Jul 29, 8:05 AM MST, 6 hours earlier.

Area forecast discussion, Jul 29, 8:05 AM MST, 6 hours before

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
805 AM PDT WED JUL 29 1998

SYNOPSIS...A TROUGH OF LOW PRESSURE CURRENTLY LOCATED OFF THE
NORTHERN CALIFORNIA COAST WILL MOVE EAST INTO THE NORTHERN GREAT
BASIN THE NEXT FEW DAYS. THIS WILL BRING A DRIER SOUTHWESTERLY FLOW
TO THE AREA ALONG WITH BREEZY CONDITIONS. TEMPERATURES WILL BE NEAR
NORMAL.

DISCUSSION...WATER VAPOR IMAGERY OFF RAMSDIS INDICATING DRYING AT THE
MID AND UPPER LEVELS THIS MORNING. THIS DRYING IS ALSO CLEARLY
EVIDENT IN THE DRA SOUNDING WITH THE PRECIPITABLE WATER AT 0.67 DOWN
FROM 0.85 YESTERDAY. EASTERLY WAVE MOVING INTO NORTHERN GULF OF
CALIFORNIA BEING SHEARED APART AS IT ENCOUNTERS SOUTHWEST FLOW ALOFT.
UPPER LOW OFF SOUTHERN OREGON COAST INITIALIZED WELL BY NEW ETA
MODEL. THE FORECAST OUT TO 36 HOURS PRETTY SIMILAR TO PREVIOUS FEW
RUNS MOVING TROUGH INLAND AND FURTHER STRENGTHENING SOUTHWEST FLOW.
NORTHERN AND E0ASTERN AREAS OF FORECAST AREA STILL SUSCEPTIBLE TO
CONVECTION TODAY BUT EVEN THESE AREAS SHOULD DRY OUT FOR THE MOST
PART THURSDAY. WILL MAKE A FEW MINOR ADJUSTMENTS TO MAINLY FIRST
PERIOD. LAS 000. KOSIER

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 4:38 PM MST	Severe Thunderstorm Warning	VEF	Mohave	57 min

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.