Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 74, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 27, 2011, 4:31 PM PDT for San Bernardino County, California. It was in force for 119 min. 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 27, 2011, 4:31 PM PDT (23:31 UTC)
- Expired
- Aug 27, 2011, 6:30 PM PDT
- In force
- 119 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 177 km from the middle of the area, began a volume at 23:35 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
San Diego, CA (KNKX), launched 12:00Z, 11.5 hours before the alert went out and 213 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
- 46 J/kg
- Mixed-layer CIN
- -838 J/kg
- Mixed-layer LCL
- 2203 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
448
WGUS55 KVEF 272331
FFWVEF
CAC071-280130-
/O.NEW.KVEF.FF.W.0074.110827T2331Z-110828T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
431 PM PDT SAT AUG 27 2011
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 630 PM PDT.
* AT 421 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM THUNDERSTORM JUST EAST OF TWENTYNINE PALMS TO
AREAS JUST EAST OF AMBOY ROAD...MOVING NORTH AT 10 MPH.
* LOCATIONS IMPACTED INCLUDE...
HIGHWAY 62 EAST OF TWENTYNINE PALMS AND AMBOY ROAD NORTH TO THE
TOWN OF AMBOY.
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 TWITTER #NWSVEGAS.
&&
LAT...LON 3457 11602 3453 11539 3413 11545 3412 11551
3409 11556 3411 11560 3404 11564 3405 11599
$$
JS2 follow-up statements
455
WGUS75 KVEF 280029
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
529 PM PDT SAT AUG 27 2011
CAC071-280130-
/O.CON.KVEF.FF.W.0074.000000T0000Z-110828T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
529 PM PDT SAT AUG 27 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...
AT 519 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT MODERATE RAIN CONTINUED OVER THE WARNED AREA. WATER IN AREA
WASHES ARE LIKELY TO REMAIN ELEVATED DUE TO THE EARLIER HEAVY RAIN
AND WATER MAY STILL BE CROSSING AREA ROADWAYS THROUGH 630 PM.
LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF SOUTHERN SAN BERNARDINO COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.
&&
LAT...LON 3457 11602 3453 11539 3413 11545 3412 11551
3409 11556 3411 11560 3404 11564 3405 11599
$$
JS759
WGUS75 KVEF 280126
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
626 PM PDT SAT AUG 27 2011
CAC071-280134-
/O.EXP.KVEF.FF.W.0074.000000T0000Z-110828T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
626 PM PDT SAT AUG 27 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...
RAIN HAS ENDED IN THE WARNED AREA AND THE WARNING WILL BE ALLOWED TO
EXPIRE ON TIME. HOWEVER...WASHES MAY REMAIN ELEVEATED AND THERE
STILL MAY BE PONDING OF WATER ON ROADWAYS. MOTORISTS SHOULD USE
CAUTION WHEN TRAVELING ROADS IN THE AREA OVER THE NEXT COUPLE OF
HOURS.
LAT...LON 3457 11602 3453 11539 3413 11545 3412 11551
3409 11556 3411 11560 3404 11564 3405 11599
$$
JSThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 3:19 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 24 hr |
| Aug 27, 2:01 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Aug 27, 3:29 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 32 min |
| Aug 27, 4:11 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 49 min |
Nearby
Flash Flood Warnings in California, 2011Every flash flood warning in 2011
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.