Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 91, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 13, 2011, 9:56 AM PDT for San Bernardino County, California; Mohave County, Arizona. It was in force for 83 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, 9:56 AM PDT (16:56 UTC)
- Expired
- Sep 13, 2011, 11:19 AM PDT
- In force
- 83 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), 102 km from the middle of the area, began a volume at 16:57 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, 4.9 hours before the alert went out and 193 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
- 239 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 1707 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
502
WGUS55 KVEF 131656
FFWVEF
AZC015-CAC071-131945-
/O.NEW.KVEF.FF.W.0091.110913T1656Z-110913T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
956 AM PDT TUE SEP 13 2011
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EXTREME SOUTHWESTERN MOHAVE COUNTY IN NORTHWEST ARIZONA...
EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 1245 PM PDT/1245 PM MST/.
* AT 948 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM NEAR NEEDLES ALONG HIGHWAY 95
AND INTERSTATE 40...SLOWLY MOVING TO THE NORTH.
* LOCATIONS IMPACTED INCLUDE...NEEDLES...NEEDLES KOA
CAMPGROUND...AND MOHAVE VALLEY. LOW WATER CROSSINGS LOCATED ALONG
NEEDLES HIGHWAY AND THE PAIUTE WASH...ALONG WITH SEVERAL LOW WATER
CROSSINGS ALONG ROUTE 95 BETWEEN MILE MARKERS 210 AND 220 WILL
LIKELY BE SIGNIFICANTLY IMPACTED.
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 3480 11468 3493 11475 3497 11454 3484 11447
3470 11443 3469 11465
$$
KENNEDY1 follow-up statement
292
WGUS75 KVEF 131819
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1119 AM PDT TUE SEP 13 2011
AZC015-CAC071-131823-
/O.CAN.KVEF.FF.W.0091.000000T0000Z-110913T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-
1119 AM PDT TUE SEP 13 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EAST CENTRAL SAN
BERNARDINO AND EXTREME SOUTHWESTERN MOHAVE COUNTIES...
ALTHOUGH LIGHT MODERATE RAINFALL IS EXPECTED TO CONTINUE THROUGH
NOON OVER NEEDLES AND ALONG PORTIONS OF INTERSTATE 40 AND HIGHWAY 95
BETWEEN TOPOCK AND MOHAVE VALLEY...RECENT REPORTS FROM THE AREA
INDICATE ONLY MINOR ROADWAY FLOODING AT THIS TIME. MINOR ROADWAY
FLOODING WILL LIKELY CONTINUE THROUGH NOON TODAY.
LAT...LON 3480 11468 3493 11475 3497 11454 3484 11447
3470 11443 3469 11465
$$
KENNEDYThe 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, 10:22 AM PDT | Flash Flood Warning | VEF | San Bernardino | 113 min |
| Sep 13, 11:09 AM PDT | Flash Flood Warning | VEF | San Bernardino | 27 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.