Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 78, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 28, 2011, 2:37 PM PDT for San Bernardino County, California. It was in force for 113 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 28, 2011, 2:37 PM PDT (21:37 UTC)
- Expired
- Aug 28, 2011, 4:30 PM PDT
- In force
- 113 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The radar
The Santa Ana Mts radar (KSOX), 131 km from the middle of the area, began a volume at 21:40 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, 9.6 hours before the alert went out and 172 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
- 19 J/kg
- Mixed-layer CIN
- -740 J/kg
- Mixed-layer LCL
- 2184 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
887
WGUS55 KVEF 282137
FFWVEF
CAC071-282330-
/O.NEW.KVEF.FF.W.0078.110828T2137Z-110828T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
237 PM PDT SUN AUG 28 2011
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 430 PM PDT.
* AT 231 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED VERY HEAVY
RAIN FROM A THUNDERSTORM NEAR JOSHUA TREE...OR 12 MILES WEST OF
TWENTYNINE PALMS. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY
STATIONARY.
* LOCATIONS IMPACTED INCLUDE...
HIGHWAY 62 NEAR JOSHUA TREE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. 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 3408 11637 3425 11639 3425 11617 3413 11615
3412 11620 3412 11626 3410 11627
$$
JS2 follow-up statements
208
WGUS75 KVEF 282241
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
341 PM PDT SUN AUG 28 2011
CAC071-282330-
/O.CON.KVEF.FF.W.0078.000000T0000Z-110828T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
341 PM PDT SUN AUG 28 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...
AT 329 PM PDT...REPORTS OF FLASH FLOODING WERE RECEIVED BY THE FIRE
DEPARTMENT...LOCAL LAW ENFORECMENT AND TRAINED WEATHER SPOTTERS
ALONG HIGHWAY 62 NEAR JOSHUA TREE. IN ADDITION...EARLIER STORMS WERE
PRODUCING HEAVY RAIN NEAR HIGHWAY 247 AND LOCALIZED FLOODING WAS
LIKELY OCCURRING THERE. THE THUNDERSTORMS THAT PRODUCED THE
EXCESSIVE RAIN HAVE WEAKENED CONSIDERABLY BUT FLOODING CONDITIONS
ARE POSSIBLE THROUGH AT LEAST 430 PM.
LOCATIONS IMPACTED INCLUDE...
JOSHUA TREE LAKE CAMPGROUND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR
WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.
&&
LAT...LON 3408 11637 3425 11639 3425 11617 3413 11615
3412 11620 3412 11626 3410 11627
$$
JS948
WGUS75 KVEF 282322
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
422 PM PDT SUN AUG 28 2011
CAC071-282330-
/O.EXP.KVEF.FF.W.0078.000000T0000Z-110828T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
422 PM PDT SUN AUG 28 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...
AT 420 PM PDT...RADAR INDICATED THAT RAIN HAD ENDED IN JOSHUA TREE.
NO REPORTS OF FLOODING HAD BEEN RECEIVED SINCE 3 PM...SO THE FLASH
FLOOD WARNING WILL BE ALLOWED TO EXPIRE.
LAT...LON 3408 11637 3425 11639 3425 11617 3413 11615
3412 11620 3412 11626 3410 11627
$$
MORGANThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 5:20 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Aug 27, 5:32 PM PDT | Areal Flood Advisory | VEF | Inyo | 118 min |
| Aug 27, 5:40 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Aug 27, 6:33 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Aug 27, 6:57 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 28, 3:39 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 40 hr |
| Aug 28, 2:19 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 52 min |
| Aug 28, 2:47 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 43 min |
| Aug 28, 4:28 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
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.