Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 93, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 13, 2011, 11:09 AM PDT for San Bernardino County, California; Mohave County, Arizona. It was in force for 27 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
- Sep 13, 2011, 11:09 AM PDT (18:09 UTC)
- Expired
- Sep 13, 2011, 11:36 AM PDT
- In force
- 27 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mohave County, AZ, San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 143 km from the middle of the area, began a volume at 18:12 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, 6.2 hours before the alert went out and 207 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
- 555 J/kg
- Mixed-layer CIN
- -307 J/kg
- Mixed-layer LCL
- 1873 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
692 WGUS55 KVEF 131809 FFWVEF AZC015-CAC071-132015- /O.NEW.KVEF.FF.W.0093.110913T1809Z-110913T2015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1109 AM MST TUE SEP 13 2011 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHWESTERN MOHAVE COUNTY IN NORTHWEST ARIZONA... EXTREME EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 115 PM MST/115 PM PDT/. * AT 1108 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR LAKE HAVASU CITY. THE STORM PRODUCING VERY HEAVY RAIN WAS MOVING NORTHEAST AT 15 MPH. * LOCATIONS IMPACTED INCLUDE... LAKE HAVASU CITY...HAVASU FALLS RV RESORT AND DESERT HILLS. 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 3456 11440 3455 11422 3441 11423 3441 11438 $$ MORGAN
1 follow-up statement
353 WGUS75 KVEF 131836 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1136 AM MST TUE SEP 13 2011 AZC015-CAC071-131846- /O.CAN.KVEF.FF.W.0093.000000T0000Z-110913T2015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MOHAVE AZ-SAN BERNARDINO CA- 1136 AM MST TUE SEP 13 2011 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME EAST CENTRAL SAN BERNARDINO AND SOUTHWESTERN MOHAVE COUNTIES... AT 1135 AM MST...RADAR INDICATED THAT THE THUNDERSTORM WITH HEAVY RAIN HAD MOVED THROUGH LAKE HAVASU CITY MUCH MORE QUICKLY THAN EXPECTED. NO REPORTS OF FLOODING WERE RECEIVED...SO THE FLASH FLOOD WARNING HAS BEEN CANCELLED. LAT...LON 3456 11440 3455 11422 3441 11423 3441 11438 $$ MORGAN
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 3:36 AM PDT | Flash Flood Watch | VEF | San Bernardino | 15 hr |
| Sep 13, 5:46 AM PDT | Areal Flood Advisory | VEF | San Bernardino | 119 min |
| Sep 13, 6:31 AM PDT | Flash Flood Warning | VEF | San Bernardino | 86 min |
| Sep 13, 8:01 AM PDT | Flash Flood Warning | VEF | San Bernardino | 119 min |
| Sep 13, 9:09 AM PDT | Flash Flood Warning | VEF | San Bernardino | 111 min |
| Sep 13, 9:56 AM PDT | Flash Flood Warning | VEF | San Bernardino | 83 min |
| Sep 13, 10:22 AM PDT | Flash Flood Warning | VEF | San Bernardino | 113 min |
| Sep 13, 4:33 AM PDT | Areal Flood Advisory | VEF | Mohave | 41 min |
| Sep 13, 5:10 AM PDT | Flash Flood Warning | VEF | Mohave | 2 hr |
| Sep 13, 5:32 AM PDT | Areal Flood Advisory | VEF | Mohave | 118 min |
| Sep 13, 8:23 AM PDT | Flash Flood Warning | VEF | Mohave | 112 min |
Nearby
Flash Flood Warnings in California, 2011Flash Flood Warnings in Arizona, 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.