Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 44, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 8, 2011, 2:26 PM PDT for San Bernardino County, California. It was in force for 79 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
- Jul 8, 2011, 2:26 PM PDT (21:26 UTC)
- Expired
- Jul 8, 2011, 3:45 PM PDT
- In force
- 79 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), 65 km from the middle of the area, began a volume at 21:27 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
Las Vegas, NV (KVEF), launched 12:00Z, 9.4 hours before the alert went out and 129 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
- 44 J/kg
- Mixed-layer CIN
- -297 J/kg
- Mixed-layer LCL
- 2374 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
899 WGUS55 KVEF 082126 FFWVEF CAC071-082330- /O.NEW.KVEF.FF.W.0044.110708T2126Z-110708T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 226 PM PDT FRI JUL 8 2011 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 430 PM PDT. * AT 217 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM OVER EAST CENTRAL SAN BERNARDINO COUNTY IN THE MOJAVE NATIONAL PRESERVE...OR 12 MILES EAST OF CIMA. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY. 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. CAMPERS AND HIKERS SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY RISING WATER AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND IF FLASH FLOODING IS OBSERVED. && LAT...LON 3529 11545 3535 11519 3514 11514 3508 11537 $$ JS
1 follow-up statement
926 WGUS75 KVEF 082245 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 345 PM PDT FRI JUL 8 2011 CAC071-082250- /O.CAN.KVEF.FF.W.0044.000000T0000Z-110708T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 345 PM PDT FRI JUL 8 2011 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EAST CENTRAL SAN BERNARDINO COUNTY... AT 340 PM...DOPPLER RADAR INDICATED THAT THUNDERSTORMS THAT PROMPTED THE WARNING HAVE DIMINISHED AND FLASH FLOODING IS NOT LONGER EXPECTED. HOWEVER...A FLOOD ADVISORY REMAINS IN EFFECT FOR THE MOJAVE NATIONAL PRESERVE THROUGH 415 PM. WASHES COULD REMAIN ELEVATED THROUGH THE REST OF THE AFTERNOON CAUSING FLOODING OF LOW WATER CROSSINGS ON AREA ROADWAYS. LAT...LON 3529 11545 3535 11519 3514 11514 3508 11537 $$ JS
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 5:57 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 7, 6:05 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 56 min |
| Jul 8, 1:24 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Jul 8, 3:10 PM PDT | Flash Flood Warning | VEF | Inyo | 2 hr |
| Jul 8, 3:32 PM PDT | Areal Flood Advisory | VEF | Inyo | 118 min |
| Jul 8, 3:35 PM PDT | Flash Flood Warning | VEF | San Bernardino | 66 min |
| Jul 8, 4:18 PM PDT | Areal Flood Advisory | VEF | Inyo | 117 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.