Alert archive / California / Flash Flood Warnings in 2002

Flash Flood Warning 4, NWS Reno, NV

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

NWS Reno, NV issued this flash flood warning at Jul 18, 2002, 1:10 PM PDT for Lassen County, Plumas County, Sierra County, California; Washoe County, Nevada. It was in force for 80 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, 1:10 PM PDT (20:10 UTC)
Expired: Jul 18, 2002, 2:30 PM PDT
In force: 80 min
Issued by: NWS Reno, NV
Area: Counties, with a storm outline in the text

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

The radar

The Reno radar (KRGX), 73 km from the middle of the area, began a volume at 20:10 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.

The nearest sounding before it

Reno, NV (KREV), launched 12:00Z, 8.2 hours before the alert went out and 182 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 182010
FFWREV
CAC035-063-091-NVC031-182130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
108 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 THE CITY OF DOYLE
  EASTERN PLUMAS COUNTY IN NORTHERN CALIFORNIA
  THIS INCLUDES THE CITIES OF...PLUMAS EUREKA STATE PARK...          
  CHILCOOT...BECKWOURTH
  NORTHEASTERN SIERRA COUNTY IN NORTHERN CALIFORNIA
  CENTRAL WASHOE COUNTY IN WESTERN NEVADA

* UNTIL 230 PM PDT

* AT 105 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN OVER HALLELUJAH JUNCTION...OR ABOUT 3 MILES EAST OF   
  CHILCOOT...MOVING NORTH AT 15 MPH. 

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...
  RURAL SOUTHWESTERN WASHOE AND SOUTHEAST LASSSEN COUNTY AT 120 PM PDT
 
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. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

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

LAT...LON 3973 12072 3953 11982 3996 11965 4014 12063

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, 12:38 PM PDT	Flash Flood Warning	REV	Lassen, Plumas	37 min
Jul 18, 12:59 PM PDT	Flash Flood Warning	REV	Nevada, Placer, Sierra	61 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.