Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 69, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 1, 2011, 3:47 PM PDT for San Bernardino County, California. It was in force for 67 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 1, 2011, 3:47 PM PDT (22:47 UTC)
- Expired
- Aug 1, 2011, 4:54 PM PDT
- In force
- 67 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), 146 km from the middle of the area, began a volume at 22:48 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, 10.8 hours before the alert went out and 183 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
- 80 J/kg
- Mixed-layer CIN
- -587 J/kg
- Mixed-layer LCL
- 938 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
920
WGUS55 KVEF 012247
FFWVEF
CAC071-020045-
/O.NEW.KVEF.FF.W.0069.110801T2247Z-110802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
347 PM PDT MON AUG 1 2011
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 345 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM NEAR WEST WIND AERO...OR 6
MILES SOUTHEAST OF TWENTYNINE PALMS...MOVING NORTH AT 5 MPH.
ANOTHER STORM WITH HEAVY RAIN WAS EXPANDING FROM JOHNSON VALLEY
TOWARD JOSHUA TREE.
* LOCATIONS IMPACTED INCLUDE...TWENTYNINE PALMS...TWENTYNINE PALMS
MCAS...WEST WIND AERO AND 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 3404 11600 3408 11600 3408 11603 3412 11606
3412 11614 3431 11645 3434 11645 3436 11641
3454 11642 3423 11567 3402 11587 3403 11598
$$
JA2 follow-up statements
799
WGUS75 KVEF 012302
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
402 PM PDT MON AUG 1 2011
CAC071-020045-
/O.CON.KVEF.FF.W.0069.000000T0000Z-110802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
402 PM PDT MON AUG 1 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...
AT 354 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE THUNDERSTORMS PRODUCING VERY HEAVY RAIN. ONE STORM WAS
LOCATED NEAR WEST WIND AERO...OR 9 MILES SOUTHEAST OF TWENTYNINE
PALMS...MOVING NORTHEAST AT 10 TO 15 MPH. THE OTHER STORM WAS
BETWEEN JOSHUA TREE AND JOHNSON VALLEY...TO THE NORTHEAST OF STATE
ROUTE 247. THESE STORMS ARE CAPABLE OF PRODUCING OVER AN INCH OF
RAIN IN 30 MINUTES WHICH WILL RESULT IN FLASH FLOODING ALONG STATE
ROUTE 62 AND SECONDARY ROADS IN THE WARNING AREA.
LOCATIONS IMPACTED INCLUDE...TWENTYNINE PALMS...TWENTYNINE PALMS
CORPS AIR STATION...AND SECTIONS OF STATE ROUTE 62 EAST OF
TWENTYNINE PALMS TO AROUND MILE MARKER 50.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR
WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.
&&
LAT...LON 3404 11600 3408 11600 3408 11603 3412 11606
3412 11614 3431 11645 3434 11645 3436 11641
3454 11642 3423 11567 3402 11587 3403 11598
$$
JA471
WGUS75 KVEF 012354
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
454 PM PDT MON AUG 1 2011
CAC071-020000-
/O.CAN.KVEF.FF.W.0069.000000T0000Z-110802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
454 PM PDT MON AUG 1 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL SAN
BERNARDINO COUNTY...
THUNDERSTORMS HAVE MOVED AWAY FROM THE AREA AROUND TWENTYNINE PALMS
AND NEARBY SECTIONS OF STATE ROUTE 62 AND THE HEAVY RAIN SHOWERS
ENDED SHORTLY AFTER 4 PM PDT. DUE TO THE BRIEF PERIOD OF HEAVY
RAIN...THE THREAT OF SIGNIFICANT FLOODING HAS ENDED.
LAT...LON 3404 11600 3408 11600 3408 11603 3412 11606
3412 11614 3431 11645 3434 11645 3436 11641
3454 11642 3423 11567 3402 11587 3403 11598
$$
JAThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 4:43 PM PDT | Flash Flood Warning | VEF | Inyo | 2 hr |
| Aug 1, 4:45 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 45 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.