Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 6, NWS Reno, NV

July 23, 2004Lassen County, California

NWS Reno, NV issued this flash flood warning at Jul 23, 2004, 6:20 PM PDT for Lassen County, California. It was in force for 85 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 23, 2004, 6:20 PM PDT (01:20 UTC)
Expired
Jul 23, 2004, 7:45 PM PDT
In force
85 min
Issued by
NWS Reno, NV
Area
Counties, with a storm outline in the text

County Lassen County, CA

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 00:00Z, 1.3 hours before the alert went out and 245 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-pSkew-T log-p diagram, Medford/Jackson, OR at 00:00Z on 2004-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 00:00Z on 2004-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
6 J/kg
Mixed-layer CIN
-291 J/kg
Mixed-layer LCL
3926 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
64 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 KREV 240124
FFWREV
CAC035-240245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
620 PM PDT FRI JUL 23 2004

THE NATIONAL WEATHER SERVICE IN RENO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LASSEN COUNTY IN NORTHERN CALIFORNIA
  THIS INCLUDES THE CITY OF EAGLE LAKE NORTH
  TOWARD HAYDEN HILL AND BALD MOUNTAIN TO
  THE WEST OF HIGHWAY 139  

* UNTIL 745 PM PDT

* AT 620 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  POSSIBLE HEAVY RAIN AND POTENTIAL FLASH FLOODING FROM A NEARLY     
  STATIONARY THUNDERSTORM OVER THE WARNED AREA.

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

LAT...LON 4056 12097 4055 12062 4091 12082 4090 12105

$$

JAH

The office that day

Everything else NWS Reno, NV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 23, 6:34 PM PDTFlash Flood WarningREVPlumas86 min
Jul 24, 3:17 PM PDTSevere Thunderstorm WarningREVSierra43 min
Jul 24, 4:31 PM PDTSevere Thunderstorm WarningREVLassen, Plumas44 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.