Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 209, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 11, 2012, 5:43 PM MST for Mohave County, Arizona; Clark County, Nevada; San Bernardino County, California. It was in force for 2 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 11, 2012, 5:43 PM MST (00:43 UTC)
- Expired
- Sep 11, 2012, 7:45 PM MST
- In force
- 2 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV
The radar
The Las Vegas radar (KESX), 75 km from the middle of the area, began a volume at 00:45 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 11, 7:00 PM MST | FLASH FLOOD | 2 Nne Mohave Valley, AZ | SPOTTER REPORTED WATER AND DEBRIS FLOWING ACROSS HIGHWAY 95 IN MULTIPLE PLACES WHERE WASHES FLOW ACROSS THE HIGHWAY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 00:00Z, 0.7 hours before the alert went out and 166 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
- 352 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 827 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
553
WGUS55 KVEF 120043
FFWVEF
AZC015-CAC071-NVC003-120245-
/O.NEW.KVEF.FF.W.0209.120912T0043Z-120912T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
543 PM PDT TUE SEP 11 2012
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN MOHAVE COUNTY IN NORTHWEST ARIZONA...
EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
EXTREME SOUTH CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...
* UNTIL 745 PM PDT/745 PM MST/.
* AT 541 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A LINE OF THUNDERSTORMS FROM LAUGHLIN TO
NEEDLES. THESE THUNDERSTORMS WERE MOVING SOUTHEAST AT 10 MPH.
* LOCATIONS IMPACTED INCLUDE...
RIVERSIDE ADVENTURE RV PARK...HIGHWAY 95 AND I-40...MOHAVE
VALLEY...NEEDLES KOA CAMPGROUND AND NEEDLES.
THIS INCLUDES INTERSTATE 40 IN CALIFORNIA BETWEEN MILE MARKERS 130
AND 145.
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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3506 11489 3526 11477 3523 11453 3481 11449
3481 11482
$$
JA2 follow-up statements
201
WGUS75 KVEF 120131
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
631 PM PDT TUE SEP 11 2012
AZC015-CAC071-NVC003-120245-
/O.CON.KVEF.FF.W.0209.000000T0000Z-120912T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-CLARK NV-
631 PM PDT TUE SEP 11 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM PDT /745 PM
MST/ FOR EXTREME SOUTH CENTRAL CLARK...EAST CENTRAL SAN BERNARDINO
AND SOUTHWESTERN MOHAVE COUNTIES...
AT 624 PM...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING VERY
HEAVY RAIN WILL MOVE TO THE SOUTHEAST AT 10 MPH AND EXIT THE AREA
FROM BULLHEAD CITY DOWN THROUGH MOHAVE VALLEY AND NEEDLES BY 730 PM.
RAINFALL AMOUNTS OVER ONE INCH IN 30 MINUTES CAN BE EXPECTED WITH
THESE STORMS WHICH WILL RESULT IN FLASH FLOODING ALONG STATE ROUTE
95 BETWEEN NEEDLES AND BULLHEAD CITY. OTHER LOCATIONS IMPACTED
INCLUDE NEEDLES...MOHAVE VALLEY...FORT MOHAVE...LAUGHLIN AND
BULLHEAD CITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR
WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3506 11489 3526 11477 3523 11453 3481 11449
3481 11482
$$
JA952
WGUS75 KVEF 120241
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
741 PM PDT TUE SEP 11 2012
AZC015-CAC071-NVC003-120250-
/O.EXP.KVEF.FF.W.0209.000000T0000Z-120912T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-CLARK NV-
741 PM PDT TUE SEP 11 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 745 PM PDT/745 PM MST/ FOR
EXTREME SOUTH CENTRAL CLARK - EAST CENTRAL SAN BERNARDINO AND
SOUTHWESTERN MOHAVE COUNTIES...
AT 740 PM PDT...RADAR INDICATED THAT RAIN HAD ENDED NEAR THE ARIZONA
CALIFORNIA NEVADA TRIPLE POINT. THEREFORE...THE FLASH FLOOD WARNING
WILL BE ALLOWED TO EXPIRE.
AT 700 PM...A SPOTTER IN MOHAVE VALLEY REPORTED WATER AND DEBRIS
FLOWING ACROSS ARIZONA HIGHWAY 95.
LAT...LON 3506 11489 3526 11477 3523 11453 3481 11449
3481 11482
$$
MORGANThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 6:11 PM MST | Areal Flood Warning | VEF | Clark | 10 hr |
| Sep 11, 5:25 PM MST | Severe Thunderstorm Warning | VEF | San Bernardino | 35 min |
| Sep 11, 5:54 PM MST | Severe Thunderstorm Warning | VEF | San Bernardino | 19 min |
| Sep 11, 6:41 PM MST | Flash Flood Warning | VEF | Inyo | 2 hr |
| Sep 11, 7:54 PM MST | Flash Flood Warning | VEF | Inyo | 71 min |
| Sep 11, 8:36 PM MST | Severe Thunderstorm Warning | VEF | San Bernardino | 39 min |
| Sep 11, 9:59 PM MST | Severe Thunderstorm Warning | VEF | San Bernardino | 76 min |
| Sep 11, 11:02 PM MST | Flash Flood Warning | VEF | San Bernardino | 118 min |
Nearby
Flash Flood Warnings in Arizona, 2012Flash Flood Warnings in Nevada, 2012Flash Flood Warnings in California, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.