Alert archive / California / Flash Flood Warnings in 2002

Flash Flood Warning 7, NWS Reno, NV

July 18, 20025 counties in California; 5 counties in Nevada

NWS Reno, NV issued this flash flood warning at Jul 18, 2002, 3:19 PM PDT for 5 counties in California; 5 counties in Nevada. It was in force for 101 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, 3:19 PM PDT (22:19 UTC)
Expired: Jul 18, 2002, 5:00 PM PDT
In force: 101 min
Issued by: NWS Reno, NV
Area: Counties, with a storm outline in the text

Counties Lassen County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Sierra County, CA, Churchill County, NV, Lyon County, NV, Pershing County, NV, Storey County, NV, Washoe County, NV

The radar

The Reno radar (KRGX), 53 km from the middle of the area, began a volume at 22:18 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, 10.3 hours before the alert went out and 135 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 182219
FFWREV
CAC035-057-061-063-091-NVC001-019-027-029-031-190000-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  IN CENTRAL CALIFORNIA...
  NORTHEASTERN NEVADA COUNTY
  NORTHEASTERN PLACER COUNTY
  IN NORTHERN CALIFORNIA...
  LASSEN COUNTY...
  THIS INCLUDES SUSANVILLE
  EASTERN PLUMAS COUNTY...
  THIS INCLUDES PORTOLA
  EASTERN SIERRA COUNTY
  IN WEST CENTRAL NEVADA...
  NORTHWESTERN CHURCHILL COUNTY
  SOUTHWESTERN PERSHING COUNTY...
  THIS INCLUDES THE CITY OF LOVELOCK
  IN WESTERN NEVADA...
  NORTH CENTRAL LYON COUNTY
  STOREY COUNTY 
  CENTRAL WASHOE COUNTY
  THIS INCLUDES PYRAMID LAKE

* UNTIL 500 PM PDT

* AT 315 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY 
HEAVY   RAIN OVER A LARGE PART OF WESTERN NEVADA INCLUDING I-80 EAST 
OF FERNLEY TO LOVELOCK...AND ALONG AND JUST EAST OF THE SIERRA CREST 
FROM TRUCKEE TO SUSANVILLE. THESE STORMS WERE MOVING VERY SLOWLY TO 
THE NORTHWEST.

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.


CAMPERS SHOULD AVOID CAMPING ALONG STREAMS OR CREEKS DURING 
THREATENING RAINS.

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

LAT...LON 4056 11928 4095 12058 4051 12143 3913 12016
          3951 11908 4012 11813 4050 11826

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, 1:10 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, 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.