Alert archive / Arizona / Flash Flood Warnings in 1990
Flash Flood Warning 42, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 12, 1990, 4:07 AM MST for Mohave County, Arizona. It was in force for 95 min.
The area
The counties it named.
The facts
- Issued
- Aug 12, 1990, 4:07 AM MST (11:07 UTC)
- Expired
- Aug 12, 1990, 5:42 AM MST
- In force
- 95 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, 11.1 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
- 12 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- -25 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 KPHX 121118 FFWPHX AZC015-121415- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX ARIZONA 407 AM MST SUN AUG 12 1990 THE NATIONAL WEATHER SERVICE IN PHOENIX ARIZONA HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 700 AM MST FOR THE FOLLOWING LOCATIONS...... IN NORTHWEST ARIZONA ...SOUTHWESTERN MOHAVE COUNTY... WHICH INCLUDES THE HIGHWAYS CONNECTING BULLHEAD CITY. A FEW THUNDERSTORMS WHICH DEVELOPED OVER SOUTHERN NEVADA AND NORTHWEST ARIZONA MERGED OVER BULLHEAD CITY AFTER 330 AM. VERY HEAVY RAIN LEAD TO FLOODING OF WASHES AND SOME CITY STREETS. HIGHWAY 95 ACROSS THE SOUTHERN END OF TOWN WAS CLOSED IN 3 LOCATIONS DUE TO HEAVY RUNOFF. HEAVY RAIN WILL PERSIST AROUND THE BULLHEAD CITY AREA UNTIL 4AM. WASHES AND URBAN FLOODING WILL TAKE AN HOUR OR SO TO SUBSIDE. MOTORISTS PLANNING TRAVEL IN AND OUT OF BULLHEAD CITY SHOULD POSTPONE PLANS FOR A FEW HOURS UNTIL THE STORM IS OVER. THE FLASH FLOOD WARNING FOR THE BULLHEAD CITY AREA IS IN EFFECT UNTIL 7 AM. URBAN FLOODING IS OVERFLOW OF CITY STREETS AND DRAINAGE SYSTEMS... ENOUGH TO FLOOD RESIDENCES AND BUSINESSES AND CLOSE CITY STREETS. POSTPONE ANY UNNECESSARY DRIVING UNTIL THE STORM IS OVER. MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES. DONT TRY TO CROSS FLOODING WASHES OR STREAMS. NEVER DRIVE ONTO A BRIDGE COVERED BY WATER. STAY OFF FLOODED CITY STREETS. OUTSIDE THE CITY...STAY ON MAIN HIGHWAYS. AVOID SECONDnARY ROADS AND FARM ROADS...ESPECIALLY AT NIGHT. VASQUEZ
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 12, 4:02 AM MST, 5 minutes before
AZZALL-121300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PHOENIX ARIZONA 400 PM MST SUN AUG 12 1990 ... NEW THUNDERSTORMS DEVELOPING IN THE BULLHEAD CITY AREA... A FEW THUNDERSTORMS RANDOMLY DEVELOPED OVER SOUTHERN NEVADA AND FAR NORTHWEST ARIZONA THROUGH THE NIGHT. THUNDERSTORMS OVER THESE AREAS HAVE BEEN PRODUCING BRIEF HEAVY RAINS. AFTER 330 AM A NEW AREA OF THUNDERSTORMS DEVELOPED IN THE BULLHEAD CITY AREA. THESE STORMS WERE DRIFTING SLOWLY SOUTHWARD AND EXPECTED TO PRODUCE BRIEF HEAVY RAINS AND STRONG WINDS. THESE THUNDERSTORMS ARE EXPECTED TO PERSIST FOR AN HOUR OR SO THEN DISSIPATE. THE AIRMASS OVER NORTHWEST ARIZONA IS VERY MOIST AND UNSTABLE AND THUNDERSTORM REDEeVELOPMENT CAN TAKE PLACE AT ANYTIME. VASQUEZ
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 6:19 PM MST | Flash Flood Warning | PSR | Yuma | 116 min |
| Aug 11, 6:19 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 116 min |
| Aug 11, 6:26 PM MST | Flash Flood Warning | PSR | Maricopa | 64 min |
| Aug 11, 6:26 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 64 min |
| Aug 11, 6:55 PM MST | Flash Flood Warning | PSR | La Paz | 2 hr |
| Aug 11, 6:55 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 2 hr |
| Aug 11, 7:08 PM MST | Flash Flood Warning | PSR | Yuma | 2 hr |
| Aug 11, 7:08 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 2 hr |
| Aug 11, 7:27 PM MST | Flash Flood Warning | PSR | Maricopa | 63 min |
| Aug 11, 7:27 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 63 min |
| Aug 11, 8:23 PM MST | Flash Flood Warning | PSR | Maricopa | 67 min |
| Aug 11, 8:23 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 67 min |
| Aug 11, 9:15 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 60 min |
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.