Alert archive / Arizona / Flash Flood Warnings in 1990
Flash Flood Warning 35, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 9, 1990, 5:55 PM MST for Mohave County, Arizona. It was in force for 78 min.
The area
The counties it named.
The facts
- Issued
- Aug 9, 1990, 5:55 PM MST (00:55 UTC)
- Expired
- Aug 9, 1990, 7:13 PM MST
- In force
- 78 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Mohave County, AZ
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Mercury/Desert R, NV (KDRA), launched 00:00Z, 0.9 hours before the alert went out and 226 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 0 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KLAS 100056 FFWLAS AZC015-NVC003-100400- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 555 PM PDT THU AUG 9 1990 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 900 PM PDT FOR PEOPLE IN THE FOLLOWING LOCATIONS...S... IN NORTHWEST ARIZONA ...NORTHWESTERN MOHAVE COUNTY IN SOUTH NEVADA ...SOUTHEASTERN CLARK COUNTY AT 540 PM LAS RADAR SHOWS SLOW MOVING THUNDERSTORMS MOVING WESTWARD TO THE LAKE MEAD RECREATION COMPLEX. HEAVY RAIN IS EXPECTED FROM THE THUNDERSTORMS. 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. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
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, Aug 9, 5:48 PM MST, 7 minutes before
AZZ007 100100 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE YUMA AZ 545 PM MST THU AUG 9 1990 ...A STRONG THUNDERSTORM STRUCK SAN LUIS ARIZONA AT 615 PM... SMALL HAIL AND BRIEF HEAVY RAIN WAS REPORTED FROM THE STORM...ALONG WITH STRONG GUSTY WINDS. WIND ESTIMATES WERE AROUND 60 MPH. THE STORM IS MOVING SLOWLY TO THE WEST. JUST TO THE NORTH...AT SOMERTON...THERE WAS NO RAIN...ONLY DUST. THE DUST AND WIND SPREAD INTO YUMA AT 6:30...WITH GUSTS NEAR 40 MPH. THE STORM IS MOVING TO THE WEST...INTO NORTHERN BAJA IN MEXICO. SHOWERS WILL END IN SAN LUIS ARIZONA..AND WINDS WILL DECREASE ACROSS THE AREA THIS EVENING. MATHESON
Special weather statement, Aug 9, 5:50 PM MST, 5 minutes before
AZZ007 100100 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE YUMA AZ 545 PM MST THU AUG 9 1990 ...A STRONG THUNDERSTORM STRUCK SAN LUIS ARIZONA AT 515 PM... SMALL HAIL AND BRIEF HEAVY RAIN WAS REPORTED FROM THE STORM...ALONG WITH STRONG GUSTY WINDS. WIND ESTIMATES WERE AROUND 60 MPH. THE STORM IS MOVING SLOWLY TO THE WEST. JUST TO THE NORTH...AT SOMERTON...THERE WAS NO RAIN...ONLY DUST. THE DUST AND WIND SPREAD INTO YUMA AT 6:30...WITH GUSTS NEAR 40 MPH. THE STORM IS MOVING TO THE WEST...INTO NORTHERN BAJA IN MEXICO. SHOWERS WILL END IN SAN LUIS ARIZONA..AND WINDS WILL DECREASE ACROSS THE AREA THIS EVENING. MATHESON
Nearby
Flash Flood Warnings in Arizona, 1990Every flash flood warning in 1990
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.