Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 3, NWS Reno, NV
NWS Reno, NV issued this flash flood warning at Aug 14, 2012, 4:26 PM PDT for Nevada County, Placer County, California. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 14, 2012, 4:26 PM PDT (23:26 UTC)
- Expired
- Aug 14, 2012, 6:30 PM PDT
- In force
- 2 hr
- Issued by
- NWS Reno, NV
- Area
- Storm-based polygon
- Flood severity
- None
Counties Nevada County, CA, Placer County, CA
The radar
The Reno radar (KRGX), 70 km from the middle of the area, began a volume at 23:27 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, 11.4 hours before the alert went out and 164 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2794 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
101
WGUS55 KREV 142326
FFWREV
CAC057-061-150130-
/O.NEW.KREV.FF.W.0003.120814T2326Z-120815T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
426 PM PDT TUE AUG 14 2012
THE NATIONAL WEATHER SERVICE IN RENO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL NEVADA COUNTY IN CENTRAL CALIFORNIA...
EXTREME NORTHEASTERN PLACER COUNTY IN CENTRAL CALIFORNIA...
* UNTIL 630 PM PDT
* AT 418 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HIRSCHDALE
A NEARLY STATIONARY THUNDERSTORM OVER THE MARTIS VALLEY IS PRODUCING
HEAVY RAIN. DOPPLER RADAR IN RENO INDICATES UP TO 1 INCH OF RAIN IN
THE LAST HOUR. THIS STORM WILL CONTINUE TO PRODUCE HEAVY RAIN
THROUGH THE NEXT 30 MINUTES...AND THIS ADDITIONAL HEAVY RAIN SHOULD
PRODUCE EXCESSIVE RUN OFF THROUGH THE MARTIS VALLEY. THIS RUN OFF
MAY LEAD TO FLASH FLOODING IN LOW LYING AREAS AND ALONG STEEP
TERRAIN.
A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR OCCURRING. PEOPLE
IN FLOOD PRONE AND LOW LYING AREAS SHOULD MOVE TO HIGHER GROUND. DO
NOT ATTEMPT TO CROSS SWIFT FLOWING WATER BY FOOT OR AUTOMOBILE.
LAT...LON 3936 12015 3939 12007 3941 12001 3932 12002
3930 12007 3928 12015
$$2 follow-up statements
543
WGUS75 KREV 150009
FFSREV
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
509 PM PDT TUE AUG 14 2012
CAC057-061-150130-
/O.CON.KREV.FF.W.0003.000000T0000Z-120815T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEVADA CA-PLACER CA-
509 PM PDT TUE AUG 14 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR
EXTREME NORTHEASTERN PLACER AND EAST CENTRAL NEVADA COUNTIES...
AT 456 PM PDT...THUNDERSTORMS PRODUCING MODERATE TO HEAVY RAIN WAS
CONTINUING OVER THE SOUTHERN PORTIONS OF THE MARTIS VALLEY. DOPPLER
RADAR INDICATES RAIN FALL OF UP TO 2 INCHES IN THIS AREA OVER THE
LAST ONE AND A HALF HOURS. RAIN FALL RATES ARE DECREASING BUT RAPID
RUN OFF FROM THE PREVIOUS HEAVY RAIN COULD STILL PRODUCE FLASH
FLOODING IN PORTIONS OF THE MARTIS VALLEY AND ALONG THE STEEPER
TERRAIN.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HIRSCHDALE
A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR OCCURRING. PEOPLE
IN FLOOD PRONE AND LOW LYING AREAS SHOULD MOVE TO HIGHER GROUND. DO
NOT ATTEMPT TO CROSS SWIFT WATERS BY FOOT OR AUTOMOBILE.
LAT...LON 3936 12015 3939 12007 3941 12001 3932 12002
3930 12007 3928 12015
$$596
WGUS75 KREV 150124
FFSREV
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
624 PM PDT TUE AUG 14 2012
CAC057-061-150134-
/O.EXP.KREV.FF.W.0003.000000T0000Z-120815T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEVADA CA-PLACER CA-
624 PM PDT TUE AUG 14 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM PDT FOR EXTREME
NORTHEASTERN PLACER AND EAST CENTRAL NEVADA COUNTIES...
THE THREAT FOR CONTINUED FLASH FLOODING HAS DIMINISHED. LIGHT RAIN
WILL CONTINUE FOR ANOTHER HOUR OVER PORTIONS OF THE MARTIS VALLEY.
REMEMBER THAT MINOR FLOODING OR RUNOFF MAY CONTINUE IN LOW SPOTS FOR
SEVERAL HOURS.
LAT...LON 3936 12015 3939 12007 3941 12001 3932 12002
3930 12007 3928 12015
$$The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 4:18 PM PDT | Severe Thunderstorm Warning | REV | Nevada, Placer | 42 min |
Nearby
Flash Flood Warnings in California, 2012Every flash flood warning in 2012
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.