Alert archive / California / Flash Flood Warnings in 2003

Flash Flood Warning 7, NWS Reno, NV

July 31, 2003Nevada County, Sierra County, California

NWS Reno, NV issued this flash flood warning at Jul 31, 2003, 3:28 PM PDT for Nevada County, Sierra County, California. It was in force for 92 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 31, 2003, 3:28 PM PDT (22:28 UTC)
Expired: Jul 31, 2003, 5:00 PM PDT
In force: 92 min
Issued by: NWS Reno, NV
Area: Whole counties

Counties Nevada County, CA, Sierra County, CA

The nearest sounding before it

Reno, NV (KREV), launched 12:00Z, 10.5 hours before the alert went out and 210 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: 3 J/kg
Mixed-layer CIN: -379 J/kg
Mixed-layer LCL: 2514 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 153 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 312232
FFWREV
CAC057-091-010000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
328 PM PDT THU JUL 31 2003

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN NEVADA COUNTY IN CENTRAL CALIFORNIA
  THIS INCLUDES THE CITIES OF...PROSSER CREEK RESERVOIR...BOCA
  RESERVOIR
  EASTERN SIERRA COUNTY IN NORTHERN CALIFORNIA
  THIS INCLUDES THE CITIES OF...STAMPEDE RESERVOIR...SIERRAVILLE

* UNTIL 500 PM PDT

* AT 327 PM PDT...SKYWARN SPOTTERS REPORTED VERY HEAVY 
  RAIN 6 MILES NORTHEAST OF INDEPENDENCE LAKE...OR ABOUT 6 MILES
  WEST OF STAMPEDE RESERVOIR...MOVING NORTHWEST AT 25 MPH.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...
  3 MILES NORTHEAST OF SIERRAVILLE AT 345 PM PDT
  5 MILES NORTHEAST OF SATTLEY AT 355 PM PDT

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL 
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...LOW 
LYING AREAS ARE SUBJECT TO FLASH FLOODING.

A SPOTTER AT TAHOE-DONNER REPORTED TW0 TENTHS OF AN INCH OF RAIN IN 
5 MINUTES. MEYER CALIFORNIA RECORDED .85 INCHES IN THE PAST 2 HOURS.

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. 

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

$$

LAT...LON 3970 12019 3944 12006 3938 12005 3937 12030
          3961 12047 3971 12038

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 1:53 PM PDT	Severe Thunderstorm Warning	REV	El Dorado, Placer	22 min
Jul 31, 2:59 PM PDT	Severe Thunderstorm Warning	REV	Nevada, Placer, Sierra	16 min
Jul 31, 3:12 PM PDT	Severe Thunderstorm Warning	REV	Nevada, Sierra	18 min
Jul 31, 3:27 PM PDT	Severe Thunderstorm Warning	REV	Nevada, Sierra	33 min
Jul 31, 3:39 PM PDT	Tornado Warning	REV	Sierra	21 min
Jul 31, 4:00 PM PDT	Severe Thunderstorm Warning	REV	Plumas, Sierra	25 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.