Alert archive / California / Flash Flood Warnings in 2007

Flash Flood Warning 21, NWS Reno, NV

August 30, 2007Lassen County, California

NWS Reno, NV issued this flash flood warning at Aug 30, 2007, 4:28 PM PDT for Lassen County, California. It was in force for 2 hr. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 30, 2007, 4:28 PM PDT (23:28 UTC)
Expired: Aug 30, 2007, 6:30 PM PDT
In force: 2 hr
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 23:30 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.

What was reported inside it

Time	Report	Where	Remark
Aug 30, 4:45 PM PDT	HEAVY RAIN 0.84	8 E Bieber, CA	MEASURED 0.84 INCHES OF RAIN WITHIN 45 MINUTES. MARBLE SIZE HAIL WITH WIND EST 35-40 MPH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Reno, NV (KREV), launched 12:00Z, 11.5 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: 50 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 2645 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 76 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 302332
FFWREV
CAC035-310130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
428 PM PDT THU AUG 30 2007

THE NATIONAL WEATHER SERVICE IN RENO HAS EXTENDED THE 

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN LASSEN COUNTY IN NORTHERN CALIFORNIA...
  THIS INCLUDES THE CITY OF HERLONG...

* UNTIL 630 PM PDT

* AT 421 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES   
  TO SHOW MODERATE TO HEAVY RAINFALL ALONG HIGHWAY 395 FROM DOYLE TO 
  JANESVILLE.  THIS RAINFALL WILL ADD TO THE RUNOFF FROM EARLIER     
  THIS AFTERNOON.  REPORTS AND RADAR ESTIMATES SHOW BETWEEN 1 AND 2  
  INCHES OF RAIN HAVE FELL OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO AMEDEE ARMY
  AIRFIELD AND HONEY LAKE.

CONTINUED RUNOFF WILL CAUSE FLOODING OF SMALL CREEKS AND 
STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF 
CREEKS AND STREAMS.

LAT...LON 4017 12040 4025 12034 4029 12015 4027 12001
      4001 12011 4009 12023
TIME...MOT...LOC 2328Z 180DEG 0KT 4015 12014

$$

BRONG

2 follow-up statements

000 
WGUS75 KREV 310022
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
518 PM PDT THU AUG 30 2007

CAC035-310130-
LASSEN CA-
518 PM PDT THU AUG 30 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR
SOUTHEASTERN LASSEN COUNTY...

AT 512 PM PDT...LIGHT TO MODERATE RAIN WILL CONTINUE ALONG HIGHWAY 
395 FROM JANESVILLE TO DOYLE AND EASTWARD OVER HONEY LAKE AND 
HERLONG.  RAINFALL WILL CONTINUE TO DECREASE OVER THE NEXT 
HOUR...HOWEVER THE POTENTIAL FOR FLOODING NEAR SMALL CREEKS AND 
STREAMS...COUNTRY ROADS AND FARMLAND REMAINS HIGH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO AMEDEE ARMY
AIRFIELD AND HONEY LAKE.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

LAT...LON 4017 12040 4025 12034 4029 12015 4027 12001
      4001 12011 4009 12023
TIME...MOT...LOC 0018Z 180DEG 0KT 4015 12014

$$

BRONG

000 
WGUS75 KREV 310123
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
620 PM PDT THU AUG 30 2007

CAC035-310130-
LASSEN CA-
620 PM PDT THU AUG 30 2007

...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM PDT FOR SOUTHEASTERN
LASSEN COUNTY...

MODERATE TO HEAVY RAIN HAS ENDED ACROSS SOUTHEASTERN LASSEN COUNTY.  
WATER MAY REMAIN OVER SOME RURAL ROADS THIS EVENING...ESPECIALLY 
NEAR HERLONG.

LAT...LON 4017 12040 4025 12034 4029 12015 4027 12001
      4001 12011 4009 12023
TIME...MOT...LOC 0120Z 180DEG 0KT 4015 12014

$$

BRONG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 1:48 PM PDT	Flash Flood Warning	REV	Lassen	3 hr
Aug 30, 3:22 PM PDT	Flash Flood Warning	REV	Plumas	83 min
Aug 30, 4:01 PM PDT	Flash Flood Warning	REV	Lassen	3 hr
Aug 30, 4:34 PM PDT	Severe Thunderstorm Warning	REV	Lassen	41 min

Nearby

Flash Flood Warnings in California, 2007 Every flash flood warning in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.