Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 71, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 1, 2011, 6:45 PM PDT for San Bernardino County, California. It was in force for 3 hr. 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, 6:45 PM PDT (01:45 UTC)
- Expired
- Aug 1, 2011, 9:45 PM PDT
- In force
- 3 hr
- 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), 92 km from the middle of the area, began a volume at 01:48 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
Las Vegas, NV (KVEF), launched 00:00Z, 1.8 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
- 91 J/kg
- Mixed-layer CIN
- -113 J/kg
- Mixed-layer LCL
- 3098 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
534
WGUS55 KVEF 020145
FFWVEF
CAC071-020445-
/O.NEW.KVEF.FF.W.0071.110802T0145Z-110802T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
645 PM PDT MON AUG 1 2011
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 945 PM PDT.
* AT 638 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 20
MILES NORTHWEST OF HIGHWAY 95 AND I-40 TO NEEDLES...OR ALONG A LINE
EXTENDING FROM 24 MILES WEST OF LAUGHLIN TO 10 MILES NORTHWEST OF
TOPOCK. THE STORMS PRODUCING FLASH FLOODING WERE NEARLY STATIONARY.
* LOCATIONS IMPACTED INCLUDE...NEEDLES...HIGHWAY 95 AND I-40 AND
NEEDLES KOA CAMPGROUND.
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.
&&
LAT...LON 3521 11490 3500 11464 3492 11463 3487 11464
3484 11459 3482 11458 3481 11458 3478 11457
3477 11455 3475 11453 3474 11452 3473 11450
3473 11465 3519 11513
$$
JH2 follow-up statements
390
WGUS75 KVEF 020253
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
753 PM PDT MON AUG 1 2011
CAC071-020445-
/O.CON.KVEF.FF.W.0071.000000T0000Z-110802T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
753 PM PDT MON AUG 1 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM PDT FOR EAST
CENTRAL SAN BERNARDINO COUNTY...
AT 748 PM PDT RADAR INDICATED THAT RAINFALL WAS DECREASING IN THE
WARNING AREA. HOWEVER...RUNOFF FROM THE VERY HEAVY RAINFALL EARLIER
IS LIKELY STILL FLOWING DOWN NORMALLY DRY WASHES AND COULD POSE A
FLASH FLOOD THREAT...ESPECIALLY ALONG PORTIONS OF HIGHWAY 95 BETWEEN
INTERSTATE 40 AND THE NEVADA STATE LINE. RUNOFF MAY ALSO CONTINUE TO
IMPACT THE NEEDLES AREA.
LOCATIONS IMPACTED INCLUDE...NEEDLES...HIGHWAY 95 AND I-40 AND
NEEDLES KOA CAMPGROUND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.
&&
LAT...LON 3521 11490 3500 11464 3492 11463 3487 11464
3484 11459 3482 11458 3481 11458 3478 11457
3477 11455 3475 11453 3474 11452 3473 11450
3473 11465 3519 11513
$$
JH601
WGUS75 KVEF 020439
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
939 PM PDT MON AUG 1 2011
CAC071-020446-
/O.EXP.KVEF.FF.W.0071.000000T0000Z-110802T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
939 PM PDT MON AUG 1 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 945 PM PDT FOR EAST CENTRAL
SAN BERNARDINO COUNTY...
THERE HAS BEEN NO RAIN IN THE WARNING AREA SINCE AROUND 8 PM AND WE
HAVE RECEIVED NO REPORTS OF FLOODING SO THE FLASH FLOOD WARNING WILL
BE ALLOWED TO EXPIRE.
LAT...LON 3521 11490 3500 11464 3492 11463 3487 11464
3484 11459 3482 11458 3481 11458 3478 11457
3477 11455 3475 11453 3474 11452 3473 11450
3473 11465 3519 11513
$$
JHThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 5:29 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 46 min |
| Aug 1, 5:30 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 45 min |
| Aug 1, 6:21 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 72 min |
| Aug 1, 6:32 PM PDT | Areal Flood Advisory | VEF | Inyo | 94 min |
| Aug 1, 8:30 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.