Alert archive / California / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 9, NWS Reno, NV

July 23, 2003Lassen County, California

NWS Reno, NV issued this severe thunderstorm warning at Jul 23, 2003, 4:39 PM PDT for Lassen County, California. It was in force for 26 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 23, 2003, 4:39 PM PDT (23:39 UTC)
Expired: Jul 23, 2003, 5:05 PM PDT
In force: 26 min
Issued by: NWS Reno, NV
Area: Whole counties

County Lassen County, CA

The radar

The Reno radar (KRGX), 140 km from the middle of the area, began a volume at 23:41 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, 11.7 hours before the alert went out and 238 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: 20 J/kg
Mixed-layer CIN: -312 J/kg
Mixed-layer LCL: 2914 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 86 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.

610 
WUUS55 KREV 232339
SVRREV
CAC035-240005-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RENO NV
435 PM PDT WED JUL 23 2003

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL LASSEN COUNTY IN NORTHERN CALIFORNIA

* UNTIL 505 PM PDT

* AT 435 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF THUNDERSTORMS IN CENTRAL LASSEN COUNTY...OR NEAR THE CITY
  OF SUSANVILLE.  THE STORMS ARE MOVING EAST AT 5 MPH.

HAIL OVER 1 INCH IN DIAMETER...INTENSE RAIN AND STRONG DAMAGING WINDS ARE 
LIKELY WITH THESE STORMS. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THESE
STORMS PASS.

HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES OR CITY STEETS. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY
ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.

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

$$

LAT...LON 4054 12055 4039 12041 4054 12032 4058 12042

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:26 PM PDT	Severe Thunderstorm Warning	REV	Plumas, Sierra	34 min
Jul 22, 6:40 PM PDT	Flash Flood Warning	REV	Lassen	35 min
Jul 23, 2:39 PM PDT	Severe Thunderstorm Warning	REV	Nevada	21 min
Jul 23, 2:56 PM PDT	Severe Thunderstorm Warning	REV	Nevada	34 min
Jul 23, 3:00 PM PDT	Flash Flood Warning	REV	Nevada	2 hr
Jul 23, 3:07 PM PDT	Severe Thunderstorm Warning	REV	Lassen	33 min
Jul 23, 3:20 PM PDT	Severe Thunderstorm Warning	REV	Placer	25 min
Jul 23, 4:46 PM PDT	Flash Flood Warning	REV	Lassen	119 min
Jul 23, 4:59 PM PDT	Severe Thunderstorm Warning	REV	Lassen	31 min

Nearby

Severe Thunderstorm Warnings in California, 2003 Every severe thunderstorm 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; radar from the NEXRAD Level II archive.