Alert archive / California / Flash Flood Warnings in 2002

Flash Flood Warning 2, NWS Reno, NV

July 18, 2002Lassen County, Plumas County, California; Washoe County, Nevada

NWS Reno, NV issued this flash flood warning at Jul 18, 2002, 12:38 PM PDT for Lassen County, Plumas County, California; Washoe County, Nevada. It was in force for 37 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 18, 2002, 12:38 PM PDT (19:38 UTC)
Expired: Jul 18, 2002, 1:15 PM PDT
In force: 37 min
Issued by: NWS Reno, NV
Area: Counties, with a storm outline in the text

Counties Lassen County, CA, Plumas County, CA, Washoe County, NV

The radar

The Reno radar (KRGX), 49 km from the middle of the area, began a volume at 19:39 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, 7.6 hours before the alert went out and 159 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: 5 J/kg
Mixed-layer CIN: -261 J/kg
Mixed-layer LCL: 2165 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 25 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 181938
FFWREV
CAC035-063-NVC031-182015-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
1236 PM PDT THU JUL 18 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME SOUTHEASTERN LASSEN COUNTY IN NORTHERN CALIFORNIA
  THIS INCLUDES DOYLE
  EXTREME EAST CENTRAL PLUMAS COUNTY IN NORTHERN CALIFORNIA
  SOUTHWESTERN WASHOE COUNTY IN WESTERN NEVADA

* UNTIL 115 PM PDT

* AT 1229 PM PDT...WEATHER SPOTTERS REPORTED VERY HEAVY RAIN AT      
  HALLELUJAH JUNCTION...OR ABOUT 11 MILES   SOUTHEAST OF             
  CHILCOOT...MOVING NORTH AT 15 MPH.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...  
  DOYLE AT 110 PM PDT

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.

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. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK 
HIGHER GROUND.

LAT...LON 3966 12003 3972 11982 4011 11998 4002 12025

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 10:50 AM PDT	Severe Thunderstorm Warning	REV	Mono	25 min
Jul 18, 12:20 PM PDT	Severe Thunderstorm Warning	REV	Lassen, Plumas, Sierra	25 min
Jul 18, 12:59 PM PDT	Flash Flood Warning	REV	Nevada, Placer, Sierra	61 min
Jul 18, 1:10 PM PDT	Flash Flood Warning	REV	Lassen, Plumas, Sierra	80 min
Jul 18, 1:43 PM PDT	Flash Flood Warning	REV	El Dorado	92 min
Jul 18, 2:47 PM PDT	Flash Flood Warning	REV	Mono	58 min
Jul 18, 3:19 PM PDT	Flash Flood Warning	REV	Lassen, Nevada, Placer, Plumas, Sierra	101 min
Jul 18, 12:10 PM PDT	Severe Thunderstorm Warning	REV	Mineral	35 min
Jul 18, 3:20 PM PDT	Severe Thunderstorm Warning	REV	Pershing	25 min

Nearby

Flash Flood Warnings in California, 2002 Flash Flood Warnings in Nevada, 2002 Every flash flood warning in 2002

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.