Alert archive / Arizona / Flash Flood Warnings in 1994

Flash Flood Warning 1, NWS Las Vegas, NV

July 18, 1994Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 18, 1994, 9:44 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jul 18, 1994, 9:44 PM MST (04:44 UTC)
Expired: Jul 18, 1994, 11:45 PM MST
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Whole counties

Counties Mohave County, AZ, Clark County, NV

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 00:00Z, 4.7 hours before the alert went out and 162 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: 131 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 3422 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 110 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 190447
FFWLAS
AZC015-NVC003-190645-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
944 PM PDT MON JUL 18 1994
 
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL 1145 PM PDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...S...
 
IN NORTHWEST ARIZONA
 
   ...NORTHWESTERN MOHAVE COUNTY
 
 
IN SOUTH NEVADA
 
   ...SOUTHERN CLARK COUNTY
 
ALERT GUAGES AT COTTOWOOD COVE MARINA REPORTS A HALF INCH OF RAIN
DURING THE PAST 10 MINUES. A WEATHER SPOTTER IN SEARCHLIGHT
REPORTS STRONG GUSTY WINDS
 
LAS VEGAS RADAR SHOWED THUNDERSTORMS MOVING INTO SOUTHERN CLARK
COUNTY.
 
THIS WARNING DOES NOT INCLUDE THE LAS VEGAS VALLEY.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
 
 
 
&

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.

In the hours before

Special weather statement, Jul 18, 5:02 PM MST, 4 hours 42 minutes before

NVZ008-190400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NEVADA
502 PM PDT MON JUL 18 1994

...THUNDERSTORMS DEVELOPING IN LINCOLN COUNTY...

WEATHER RADAR AND LIGHTNING DETECTION SENSORS INDICATED SCATTERED
THUNDERSTORMS OVER EASTERN AND SOUTHERN LINCOLN COUNTY.  MOVEMENT
WAS TOWARD THE SOUTHWEST AT 20 MPH.

SOME OF THESE THUNDERSTORMS MAY PRODUCE  STRONG GUSTY WINDS, DEADLY
LIGHTNING, BRIEF HEAVY DOWNPOURS AND SMALL HAIL.

ALL PERSONS ENGAGED IN OUTDOOR ACTIVITIES ACROSS LINCOLN COUNTY
THROUGH THIS EVENING, SHOULD KEEP A WEATHER EYE TO THE SKY AND BE
PREPARED TO MOVE TO A PLACE OF SAFETY SHOULD THUNDERSTORMS MOVE
INTO YOUR AREA.

REMEMBER...LIGHTNING MAY STRIKE SOME MILES AWAY FROM THE PARENT
CLOUD.  PRECAUTIONS SHOULD BE TAKEN EVEN THOUGH A THUNDERSTORM IS
NOT DIRECTLY OVERHEAD.

LISTEN TO NOAA WEATHER RADIO, COMMERCIAL TV AND RADIO FOR LATER
STATEMENTS ANY FORECASTS.
CHS/0005Z

Special weather statement, Jul 18, 5:06 PM MST, 4 hours 38 minutes before

NVZ008-190400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NEVADA
502 PM PDT MON JUL 18 1994

...THUNDERSTORMS DEVELOPING IN LINCOLN COUNTY...

WEATHER RADAR AND LIGHTNING DETECTION SENSORS INDICATED SCATTERED
THUNDERSTORMS OVER EASTERN AND SOUTHERN LINCOLN COUNTY.  MOVEMENT
WAS TOWARD THE SOUTHWEST AT 20 MPH.

SOME OF THESE THUNDERSTORMS MAY PRODUCE  STRONG GUSTY WINDS, DEADLY
LIGHTNING, BRIEF HEAVY DOWNPOURS AND SMALL HAIL.

ALL PERSONS ENGAGED IN OUTDOOR ACTIVITIES ACROSS LINCOLN COUNTY
THROUGH THIS EVENING, SHOULD KEEP A WEATHER EYE TO THE SKY AND BE
PREPARED TO MOVE TO A PLACE OF SAFETY SHOULD THUNDERSTORMS MOVE
INTO YOUR AREA.

REMEMBER...LIGHTNING MAY STRIKE SOME MILES AWAY FROM THE PARENT
CLOUD.  PRECAUTIONS SHOULD BE TAKEN EVEN THOUGH A THUNDERSTORM IS
NOT DIRECTLY OVERHEAD.

LISTEN TO NOAA WEATHER RADIO, COMMERCIAL TV AND RADIO FOR LATER
STATEMENTS ANY FORECASTS.
CHS/0005Z

Local storm report, Jul 18, 7:57 PM MST, 1 hour 47 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
757 PM PDT MON JUL 18 1994

MONDAY JULY 18

730 PM PDT - PARK RANGER REPORTS 70 TO 90 MPH WINDS AT OVERTON NV.
             ALSO...1/2 INCH RAIN IN 20 MINS.

755 PM PDT - NELLIS AIRFORCE BASE REPORTS 66 MPH...1/2 MILE IN
             BLOWING DUST.

CHS

Local storm report, Jul 18, 8:01 PM MST, 1 hour 43 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
757 PM PDT MON JUL 18 1994

MONDAY JULY 18

730 PM PDT - PARK RANGER REPORTS 70 TO 90 MPH WINDS AT OVERTON NV.
             ALSO...1/2 INCH RAIN IN 20 M`INS.

755 PM PDT - NELLIS AIRFORCE BASE REPORTS 66 MPH...1/2 MILE IN
             BLOWING DUST.

CHS

Local storm report, Jul 18, 8:30 PM MST, 1 hour 14 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
830 PM PDT MON JUL 18 1994

MONDAY JULY 18

730 PM PDT - PARK RANGER REPORTS 70 TO 90 MPH WINDS AT OVERTON NV.
             ALSO...1/2 INCH RAIN IN 20 MINS.

755 PM PDT - NELLIS AIRFORCE BASE REPORTS 66 MPH...1/2 MILE IN
             BLOWING DUST.

812 PM PDT - WIND GUSTS TO 71 MPH AT MCCARRAN INTERNATIONAL AIRPORT.

CHS/0331Z

Local storm report, Jul 18, 8:32 PM MST, 1 hour 12 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
830 PM PDT MON JUL 18 1994

MONDAY JULY 18

730 PM PDT - PARK RANGER REPORTS 70 TO 90 MPH WINDS AT OVERTON NV.
             ALSO...1/2 INCH RAIN IN 20 MINS.

755 PM PDT - NELLIS AIRFORCE BASE REPORTS 66 MPH...1/2 MILE IN
             BLOWING DUST.

812 PM PDT - WIND GUSTS TO 71 MPH AT MCCARRAN INTERNATIONAL AIRPORT.

CHS/0331Z

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 6:03 PM MST	Severe Thunderstorm Warning	VEF	Clark	57 min
Jul 18, 9:44 PM MST	Severe Thunderstorm Warning	VEF	Clark	2 hr

Nearby

Flash Flood Warnings in Arizona, 1994 Flash Flood Warnings in Nevada, 1994 Every flash flood warning in 1994

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.