Alert archive / Arizona / Flash Flood Warnings in 1997
Flash Flood Warning 1, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 22, 1997, 7:02 PM MST for La Paz County, Arizona; Riverside County, California. It was in force for 78 min. 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 22, 1997, 7:02 PM MST (02:02 UTC)
- Expired
- Jul 22, 1997, 8:20 PM MST
- In force
- 78 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
Counties La Paz County, AZ, Riverside County, CA
The radar
The Yuma radar (KYUX), 141 km from the middle of the area, began a volume at 02:06 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
San Diego, CA (KNKX), launched 00:00Z, 2.0 hours before the alert went out and 231 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
- 4 J/kg
- Mixed-layer CIN
- -525 J/kg
- Mixed-layer LCL
- 1453 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 83 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 230204 FFWPHX AZC012-CAC065-230320- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 702 PM MST (702 PM PDT) TUE JUL 22 1997 * SEVERE THUNDERSTORM AND FLASH FLOOD WARNING FOR WESTERN LA PAZ COUNTY IN WEST CENTRAL ARIZONA SOUTHEASTERN RIVERSIDE COUNTY IN SOUTHEASTERN CALIFORNIA * UNTIL 820 PM MST (820 PM PDT) * SOME LOCATIONS AFFECTED RIPLEY...BLYTHE AND EHRENBERG * AT 600 PM MST RADAR DETECTED SEVERE THUNDERSTORMS IN FAR SOUTHEAST RIVERSIDE COUNTY APPROACHING RIPLEY...BLYTHE AND EHRENBERG FROM THE SOUTHWEST. MOVEMENT WAS TO THE NORTHEAST AT 15 MPH. THESE STORMS HAVE A HISTORY OF PRODUCING FLASH FLOODING. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH... DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. PERSONS OUT AND ABOUT IN SOUTHEAST RIVERSIDE AND WESTERN LA PAZ COUNTIES SHOULD USE CAUTION WHILE TRAVELING TONIGHT...AS SOME SECONDARY ROADS AND LOW-LYING AREAS MAY BE COVERED BY FLOODWATERS. JAH
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 22, 2:56 PM MST, 4 hours 6 minutes before
AZZ020>025-CAZ030>033-230130- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST/PDT TUE JUL 22 1997 ...SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING OVER PORTIONS OF THE FAR SOUTHEAST CALIFORNIA DESERTS NEAR IMPERIAL... SCATTERED THUNDERSTORMS DEVELOPED OVER THE BAJA CALIFORNIA MOUNTAINS SOUTH OF IMPERIAL AND MEXICALI THIS AFTERNOON. THESE STORMS WERE MOVING NORTH TOWARD WESTERN IMPERIAL COUNTY. THERE IS A SLIGHT RISK OF DAMAGING STRAIGHTLINE WINDS AND LOCALLY HEAVY RAINFALL IN WESTERN IMPERIAL COUNTY. THE FAVORED LOCATIONS FOR STRONG THUNDERSTORMS IN WESTERN IMPERIAL COUNTY ARE FROM THE TOWNS OF HOLTVILLE AND BRAWLEY WESTWARD TO THE SAN DIEGO COUNTY LINE. THIS INCLUDES PORTIONS OF INTERSTATE 8 AND THE SOUTHWESTERN SHORES OF THE SALTON SEA. .................................................................... THE OUTLOOK AREA INCLUDES THE FOLLOWING COUNTIES... IN ARIZONA IN CALIFORNIA MARICOPA YUMA IMPERIAL SOUTHERN GILA LA PAZ CENTRAL/EASTERN RIVERSIDE NORTHWEST PINAL VASQUEZ
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 6:16 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 59 min |
| Jul 22, 7:02 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 78 min |
| Jul 22, 8:01 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 74 min |
| Jul 23, 3:44 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 61 min |
| Jul 22, 6:03 PM MST | Severe Thunderstorm Warning | PSR | Imperial | 62 min |
Nearby
Flash Flood Warnings in Arizona, 1997Flash Flood Warnings in California, 1997Every flash flood warning in 1997
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; radar from the NEXRAD Level II archive.