Alert archive / California / Flash Flood Warnings in 2004
Flash Flood Warning 16, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Dec 28, 2004, 3:08 PM PST for Imperial County, Riverside County, San Bernardino County, California. 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 outline as issued.
The facts
- Issued
- Dec 28, 2004, 3:08 PM PST (23:08 UTC)
- Expired
- Dec 28, 2004, 5:15 PM PST
- In force
- 2 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Counties, with a storm outline in the text
Counties Imperial County, CA, Riverside County, CA, San Bernardino County, CA
The radar
The San Diego radar (KNKX), 138 km from the middle of the area, began a volume at 23:10 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Yuma Intl Airpor, AZ (KYUM), launched 12:00Z, 11.1 hours before the alert went out and 153 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
- 1217 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KPSR 282320 FFWPSR CAC025-065-071-290115- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 308 PM PST TUE DEC 28 2004 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN AND NORTH CENTRAL IMPERIAL COUNTY IN SOUTHEAST CALIFORNIA. THIS INCLUDES THE CITY OF SALTON CITY. CENTRAL RIVERSIDE COUNTY IN SOUTHEAST CALIFORNIA. THIS INCLUDES THE CITIES OF...DESERT CENTER...CHIRIACO SUMMIT. * UNTIL 515 PM PST * AT 304 PM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN CONTINUING TO FALL OVER PORTIONS OF CENTRAL AND EASTERN RIVERSIDE COUNTY AND OVER NORTH CENTRAL IMPERIAL COUNTY. THE HEAVIEST RAINFALL APPEARS TO BE OVER THE LITTLE CHUCKWALLA MOUNTAINS IN SOUTHEAST RIVERSIDE COUNTY AND OVER THE CHOCOLATE MOUNTAINS IN NORTHERN IMPERIAL COUNTY. THE RADAR HAS ESTIMATED BETWEEN ONE HALF AND THREE QUARTER INCHES OF RAIN PER HOUR IN THOSE AREAS...WITH ISOLATED AMOUNTS UP TO 1 INCH. AUTOMATIC STATIONS AT JOSHUA TREE NATIONAL PARK HAVE RECORDED BETWEEN 1.6 AND 1.8 INCHES RAIN SO FAR WITH THIS STORM. * MOTORISTS DRIVING IN THIS AREA SHOULD BE ON ALERT FOR RUNNING WASHES AND FLOODED ROADWAYS...AND SHOULD NOT ATTEMPT TO DRIVE THROUGH FLOODED ROADWAYS. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. LAT...LON 3316 11628 3320 11502 3417 11496 3427 11646 $$ BERKOVITZ
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 Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Dec 28, 2:02 PM PST, 1 hour 6 minutes earlier.
Area forecast discussion, Dec 28, 2:02 PM PST, 1 hour 6 minutes before
AZZ020>024-028-CAZ030>032-291200- URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE PHOENIX AZ 302 PM MST TUE DEC 28 2004 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY MORNING FOR JOSHUA TREE NATIONAL PARK...EASTERN RIVERSIDE COUNTY AND THE LOWER COLORADO RIVER VALLEY... ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE WEDNESDAY AFTERNOON FOR LA PAZ COUNTY... ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE WEDNESDAY AFTERNOON FOR NORTHWEST...CENTRAL AND NORTHEAST MARICOPA COUNTY...INCLUDING THE PHOENIX METRO AREA...AS WELL AS NORTHWEST PINAL COUNTY...AND SOUTHERN GILA COUNTY... A STRONG PACIFIC WEATHER SYSTEM WILL CONTINUE TO DEVELOPMENT WITH WIDESPREAD SHOWERS THIS THIS EVENING IN SOUTHEAST CALIFORNIA...EXPANDING EASTWARD TO SOUTH-CENTRAL ARIZONA OVERNIGHT. THE SHOWER ACTIVITY WILL BEGIN TO DECREASE FROM WEST TO EAST DURING THE DAY WEDNESDAY. THERE WILL ALSO BE A SLIGHT CHANCE OF THUNDERSTORMS ALONG WITH THE SHOWERS. THIS SYSTEM HAS THE POTENTIAL TO PRODUCE HEAVY RAIN WHICH COULD LEAD TO LOCALIZED FLASH FLOODING. STORM TOTAL AMOUNTS OF ONE INCH WILL BE COMMON WITH SOME LOCATIONS RECEIVING UPWARDS OF TWO INCHES... ESPECIALLY IN THE HIGHER TERRAIN AREAS. A FLASH FLOOD WATCH MEANS THAT FLOODING OF WASHES...CREEKS AND OTHER DRAINAGE AREAS IS POSSIBLE WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLOODING OCCUR OR A FLASH FLOOD WARNING BE ISSUED. 22/AJ
Hazardous weather outlook, Dec 28, 4:59 AM PST, 10 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 559 AM MST TUE DEC 28 2004 AZZ020>024-028-CAZ030>032-282300- GREATER PHOENIX AREA-JOSHUA TREE NATIONAL PARK- LOWER COLORADO RIVER VALLEY AZ-LOWER COLORADO RIVER VALLEY CA- NORTHWEST AND NORTH CENTRAL PINAL COUNTY-NORTHWEST MARICOPA COUNTY- RIVERSIDE COUNTY/EASTERN DESERTS-SOUTHERN GILA/TONTO NF FOOTHILLS- WEST CENTRAL DESERTS- 559 AM MST TUE DEC 28 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN RIVERSIDE COUNTY IN CALIFORNIA...AS WELL AS LA PAZ...NORTHERN AND CENTRAL MARICOPA ...NORTHERN PINAL...AND SOUTHERN GILA COUNTIES IN ARIZONA. .DAY ONE...TODAY MODERATE TO HEAVY RAIN SHOWERS...AS WELL AS A FEW THUNDERSTORMS ...ARE EXPECTED TO DEVELOP THIS AFTERNOON AND TONIGHT OVER EASTERN RIVERSIDE COUNTY INCLUDING JOSHUA TREE NATIONAL PARK IN CALIFORNIA ...AND LA PAZ COUNTY IN ARIZONA. LOCALLY HEAVY RAIN MAY RESULT IN FLASH FLOODING...ESPECIALLY IN AND NEAR WASHES...SO A FLASH FLOOD WATCH HAS BEEN ISSUED. LOCALLY HEAVY RAIN IS POSSIBLE TONIGHT OVER NORTHERN AND CENTRAL MARICOPA COUNTY INCLUDING THE GREATER PHOENIX AREA...SOUTHERN GILA COUNTY...AND NORTHERN PINAL COUNTY IN ARIZONA. SOME FLOODING IS POSSIBLE...SO A FLASH FLOOD WATCH HAS BEEN ISSUED. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY MODERATE TO HEAVY RAIN SHOWERS...AS WELL AS A FEW THUNDERSTORMS ...ARE EXPECTED OVER CENTRAL AND EASTERN LA PAZ COUNTY...NORTHERN AND CENTRAL MARICOPA COUNTY INCLUDING THE GREATER PHOENIX AREA ...SOUTHERN GILA COUNTY...AND NORTHERN PINAL COUNTY ON WEDNESDAY. SOME FLOODING IS POSSIBLE...SO A FLASH FLOOD WATCH HAS BEEN ISSUED FOR THIS AREA. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE REQUIRED TODAY AND WEDNESDAY. AZZ025>027-CAZ033-282300- IMPERIAL COUNTY-SOUTHWEST DESERTS-SOUTHWEST MARICOPA COUNTY- YUMA/MARTINEZ LAKE AND VICINITY- 559 AM MST TUE DEC 28 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR IMPERIAL COUNTY IN CALIFORNIA...AND YUMA AND SOUTHWEST MARICOPA COUNTY IN ARIZONA. .DAY ONE...TODAY RAIN SHOWERS...AND A FEW THUNDERSTORMS...WILL BE POSSIBLE THIS AFTERNOON AND TONIGHT. BRIEF HEAVY RAIN COULD RESULT IN MINOR FLOODING OF POOR DRAINAGE AND LOW LYING AREAS...AS WELL AS CITY STREETS. WASHES MAY BEGIN FLOWING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY RAIN SHOWERS...AND A FEW THUNDERSTORMS...WILL OCCUR WEDNESDAY. BRIEF HEAVY RAIN COULD RESULT IN MINOR FLOODING OF POOR DRAINAGE AND LOW LYING AREAS...AS WELL AS CITY STREETS. WASHES MAY BEGIN FLOWING. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TODAY AND WEDNESDAY. DG
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 28, 11:31 AM PST | Flash Flood Warning | PSR | Imperial, Riverside, San Bernardino | 119 min |
| Dec 28, 1:18 PM PST | Flash Flood Warning | PSR | Imperial, Riverside, San Bernardino | 117 min |
Nearby
Flash Flood Warnings in California, 2004Every flash flood warning in 2004
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.