Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 182, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 4, 2012, 3:44 PM PDT for San Bernardino 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
- Sep 4, 2012, 3:44 PM PDT (22:44 UTC)
- Expired
- Sep 4, 2012, 5:45 PM PDT
- In force
- 2 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The radar
The San Diego radar (KNKX), 187 km from the middle of the area, began a volume at 22:46 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
Yuma Intl Airpor, AZ (KYUM), launched 12:00Z, 10.7 hours before the alert went out and 187 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
- 907 J/kg
- Mixed-layer CIN
- -175 J/kg
- Mixed-layer LCL
- 1469 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 2 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.
232
WGUS55 KVEF 042244
FFWVEF
CAC071-050045-
/O.NEW.KVEF.FF.W.0182.120904T2244Z-120905T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
344 PM PDT TUE SEP 4 2012
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 545 PM PDT.
* AT 336 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM OVER EXTREME SOUTH CENTRAL SAN
BERNARDINO COUNTY...OR 25 MILES EAST OF TWENTYNINE PALMS. THE STORM
PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.
* LOCATIONS IMPACTED INCLUDE...
HIGHWAY 62 BETWEEN MILE MARKERS 54 AND 68...OTHERWISE MAINLY RURAL
AREAS OF SOUTHERN SAN BERNARDINO COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3416 11573 3419 11549 3411 11548 3411 11553
3408 11556 3410 11560 3407 11561 3404 11560
3404 11573
$$
JS2 follow-up statements
670
WGUS75 KVEF 042350
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
450 PM PDT TUE SEP 4 2012
CAC071-050045-
/O.CON.KVEF.FF.W.0182.000000T0000Z-120905T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
450 PM PDT TUE SEP 4 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...
AT 441 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED
THUNDERSTORM ACTIVITY HAD ENDED IN THE WARNED AREA. HOWEVER...
RUNOFF FROM THE EARLIER STORM COULD STILL BE AFFECTING AREAS WHERE
WASHES CROSS HIGHWAY 62 BETWEEN MILE MARKERS 54 AND 63.
LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF SOUTHERN SAN BERNARDINO COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3416 11573 3419 11549 3411 11548 3411 11553
3408 11556 3410 11560 3407 11561 3404 11560
3404 11573
$$
JS335
WGUS75 KVEF 050049
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
549 PM PDT TUE SEP 4 2012
CAC071-050055-
/O.EXP.KVEF.FF.W.0182.000000T0000Z-120905T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
549 PM PDT TUE SEP 4 2012
...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTH CENTRAL SAN
BERNARDINO COUNTY...
THUNDERSTORMS HAVE MOVED OUT OF THE AREA AND FLASH FLOODING IS NO
LONGER EXPECTED. MOTORISTS TRAVELING ALONG HIGHWAY 62 EAST OF
TWENTYNINE PALMS SHOULD BE ALERT TO WATER AND DEBRIS LEFT ON THE
ROADWAY BY EARLIER HEAVY RAIN.
LAT...LON 3416 11573 3419 11549 3411 11548 3411 11553
3408 11556 3410 11560 3407 11561 3404 11560
3404 11573
$$
JSThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 6:08 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 37 min |
| Sep 3, 6:43 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 63 min |
| Sep 3, 7:42 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 4, 2:00 PM PDT | Flash Flood Warning | VEF | San Bernardino | 65 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.