Alert archive / California / Flash Flood Warnings in 2003

Flash Flood Warning 3, NWS Reno, NV

July 23, 2003Lassen County, California

NWS Reno, NV issued this flash flood warning at Jul 23, 2003, 4:46 PM PDT for Lassen County, California. It was in force for 119 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 23, 2003, 4:46 PM PDT (23:46 UTC)
Expired: Jul 23, 2003, 6:45 PM PDT
In force: 119 min
Issued by: NWS Reno, NV
Area: Whole counties

County Lassen County, CA

The radar

The Reno radar (KRGX), 140 km from the middle of the area, began a volume at 23:46 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

Reno, NV (KREV), launched 12:00Z, 11.8 hours before the alert went out and 238 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: 20 J/kg
Mixed-layer CIN: -312 J/kg
Mixed-layer LCL: 2914 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 86 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 232350
FFWREV
CAC035-240200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
446 PM PDT WED JUL 23 2003

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN LASSEN COUNTY IN NORTHERN CALIFORNIA
  THIS INCLUDES THE CITY OF SUSANVILLE

* UNTIL 645 PM PDT

* AT 441 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN FROM 21 MILES EAST OF STANDISH TO 15 MILES SOUTHWEST OF
  SPAULDING...OR FROM 19 MILES NORTH OF HERLONG TO 16 MILES SOUTHWEST
  OF EAGLE LAKE...MOVING NORTHEAST AT 5 MPH.


EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

TO REPORT DAMAGING WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.

$$

LAT...LON 4066 12100 4043 12102 4024 12006 4060 12008

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:26 PM PDT	Severe Thunderstorm Warning	REV	Plumas, Sierra	34 min
Jul 22, 6:40 PM PDT	Flash Flood Warning	REV	Lassen	35 min
Jul 23, 2:39 PM PDT	Severe Thunderstorm Warning	REV	Nevada	21 min
Jul 23, 2:56 PM PDT	Severe Thunderstorm Warning	REV	Nevada	34 min
Jul 23, 3:00 PM PDT	Flash Flood Warning	REV	Nevada	2 hr
Jul 23, 3:07 PM PDT	Severe Thunderstorm Warning	REV	Lassen	33 min
Jul 23, 3:20 PM PDT	Severe Thunderstorm Warning	REV	Placer	25 min
Jul 23, 4:39 PM PDT	Severe Thunderstorm Warning	REV	Lassen	26 min
Jul 23, 4:59 PM PDT	Severe Thunderstorm Warning	REV	Lassen	31 min

Nearby

Flash Flood Warnings in California, 2003 Every flash flood warning in 2003

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.