Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 3, NWS Phoenix, AZ

August 14, 2004Riverside County, San Bernardino County, California; Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 14, 2004, 2:48 AM PDT for Riverside County, San Bernardino County, California; Maricopa County, Arizona. It was in force for 36 days. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 14, 2004, 2:48 AM PDT (09:48 UTC)
Expired: Sep 19, 2004, 1:45 PM PDT
In force: 36 days
Issued by: NWS Phoenix, AZ
Area: Counties, with a storm outline in the text

Counties Maricopa County, AZ, Riverside County, CA, San Bernardino County, CA

The radar

The San Diego radar (KNKX), 145 km from the middle of the area, began a volume at 09:51 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.

What was reported inside it

Time	Report	Where	Remark
Sep 10, 3:10 PM PDT	FLASH FLOOD	5 E Twentynine Palms, CA	VEHICLES UNDER WATER IN WONDER VALLEY SUB DIVISION

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 9.8 hours before the alert went out and 165 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1794 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: -5 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 
WGUS55 KPSR 140953
FFWPSR
CAC065-071-141145-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
248 AM MST SAT AUG 14 2004

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL RIVERSIDE COUNTY IN SOUTHEAST CALIFORNIA
  SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA
  INCLUDING JOSHUA TREE NATIONAL PARK

* UNTIL 445 AM PDT

* AT 241 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR COTTONWOOD VISITOR
  CENTER...OR ABOUT 12 MILES NORTHWEST OF CHIRIACO SUMMIT. THE STORM
  PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LOST HORSE-KEYS VIEW JOSHUA TREE NATIONAL PARK...COTTONWOOD
  SPRINGS ROAD THROUGH COTTONWOOD CANYON. THIS INCLUDES THE 
  COTTONWOOD CAMPGROUND AREA.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

LAT...LON 3368 11587 3380 11572 3415 11597 3390 11628

$$

ESTLE

1 follow-up statement

000 
WGUS55 KPSR 191918
FFWPSR
AZC013-192045-
/X.NEW.KPSR.FF.W.0003.040919T1914Z-040919T2045Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1214 PM MST SUN SEP 19 2004

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA   THIS 
  INCLUDES THE AREAS AROUND CAVE CREEK...CAREFREE...SEVEN SPRINGS
  ...NEW RIVER...FAR NORTH AND NORTHEAST PHOENIX...NORTH SCOTTSDALE
  ...AND ADDITIONAL MOUNTAIN AREAS NORTH OF CAREFREE. 

* UNTIL 145 PM MST

* AT 1207 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED VERY HEAVY RAIN FALLING AT A RATE OF 1 TO 2 INCHES
  PER HOUR.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CAVE
  CREEK AND SEVEN SPRINGS.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...AND COUNTRY ROADS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 3377 11232 3374 11159 3397 11149 3402 11215

$$

HV

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 13, 5:28 PM PDT	Severe Thunderstorm Warning	PSR	Gila	62 min

Nearby

Flash Flood Warnings in California, 2004 Flash Flood Warnings in Arizona, 2004 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.