Alert archive / California / Flash Flood Warnings in 2001

Flash Flood Warning 1, NWS Reno, NV

July 8, 2001Nevada County, Placer County, California

NWS Reno, NV issued this flash flood warning at Jul 8, 2001, 5:55 PM PDT for Nevada County, Placer County, California. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jul 8, 2001, 5:55 PM PDT (00:55 UTC)
Expired
Jul 8, 2001, 6:45 PM PDT
In force
50 min
Issued by
NWS Reno, NV
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Nevada County, CA, Placer County, CA

The radar

The Reno radar (KRGX), 74 km from the middle of the area, began a volume at 00:58 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 00:00Z, 0.9 hours before the alert went out and 168 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-pSkew-T log-p diagram, Reno, NV at 00:00Z on 2001-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 156 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Reno, NV at 00:00Z on 2001-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
156 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
3195 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
-39 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 090055
FFWREV
CAC057-061-090145-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
555 PM PDT SUN JUL 8 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN NEVADA COUNTY IN CENTRAL CALIFORNIA
  EXTREME NORTHEASTERN PLACER COUNTY IN CENTRAL CALIFORNIA

* UNTIL 645 PM PDT

* AT 555 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY
  RAIN NEAR HIRSCHDALE...OR ABOUT 4 MILES SOUTH OF BOCA
  RESERVOIR...MOVING NORTHEAST AT 5 MPH.

RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS AND
STREAMS IN AREAS AFFECTED BY THE MARTIS FIRE.  THE HEAVY RAINS COULD
ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

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

LAT...LON 3935 12025 3922 12009 3927 12002 3945 12002

Nearby

Flash Flood Warnings in California, 2001Every flash flood warning in 2001

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.