Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 176, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 3, 2012, 7:42 PM PDT for San Bernardino County, California. It was in force for 3 hr. 2 reports 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 3, 2012, 7:42 PM PDT (02:42 UTC)
- Expired
- Sep 3, 2012, 10:45 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), 139 km from the middle of the area, began a volume at 02:42 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 3, 8:08 PM PDT | FLASH FLOOD | 18 Wsw Desert Hills, CA | CALIFORNIA HIGHWAY PATROL REPORTED THAT HIGHWAY 95 WAS CLOSED FROM APPROXIMATELY MILE MARKER 21 TO VIDAL JUNCTION DUE TO FLOODING AT MILE MARKER 29. THIS IS WHERE THE CHEMEHUEVI WASH CROSSES THE HIGHWAY. |
| Sep 3, 9:01 PM PDT | FLASH FLOOD | 18 Wsw Desert Hills, CA | CALIFORNIA HIGHWAY PATROL HAS CLOSED HIGHWAY 95 DUE TO FLASH FLOODING AT MILE MARKER 29 SOUTH OF NEEDLES. HIGHWAY PATROL STATED THAT THE WATER WAS TOO DEEP FOR CARS TO DRIVE THROUGH AND THERE WAS DEBRIS ALL OVER THE ROAD. |
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, 2.7 hours before the alert went out and 228 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 5554 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
454
WGUS55 KVEF 040242
FFWVEF
CAC071-040545-
/O.NEW.KVEF.FF.W.0176.120904T0242Z-120904T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
742 PM PDT MON SEP 3 2012
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EXTREME EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN
CALIFORNIA...
* UNTIL 1045 PM PDT.
* AT 730 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM OVER EXTREME SOUTHEASTERN SAN
BERNARDINO COUNTY...OR 19 MILES WEST OF LAKE HAVASU CITY. THE STORM
PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY OVER THE
CHEMEHUEVI WASH.
* LOCATIONS IMPACTED INCLUDE...CHEMEHUEVI WASH AND NUMEROUS SMALLER
WASHES THAT FEED INTO THE CHEMEHUEVI WASH. HIGHWAY 95...SPECIFICALLY
NEAR MILE MARKER 29 WHERE THE CHEMEHUEVI WASH CROSSES HIGHWAY 95 BETWEEN
NEEDLES AND VIDAL JUNCTION.
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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3453 11476 3458 11464 3455 11457 3444 11460
3445 11448 3444 11448 3442 11461 3436 11466
3435 11476
$$
PIERCE2 follow-up statements
199
WGUS75 KVEF 040423
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
923 PM PDT MON SEP 3 2012
CAC071-040545-
/O.CON.KVEF.FF.W.0176.000000T0000Z-120904T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
923 PM PDT MON SEP 3 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM PDT FOR EAST
CENTRAL SAN BERNARDINO COUNTY...
AT 916 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS CLOSED A PORTION OF
HIGHWAY 95 SOUTH OF NEEDLES...NEAR HAVASU LAKE ROAD EARLIER IN THE
EVENING. THE HIGHWAY HAS ALSO BEEN CLOSED AT STATE ROUTE 62 AT VIDAL
JUNCTION.
THUNDERSTORMS HAVE WEAKENED IN THE AREA...HOWEVER RUNOFF FROM
EARLIER RAINFALL WILL CONTINUE IN THE CHEMEHUEVI WASH AND OTHER
NUMEROUS WASHES THAT CROSS HIGHWAY 95.
LOCATIONS IMPACTED INCLUDE...HIGHWAY 95 BETWEEN NEEDLES AND VIDAL
JUNCTION.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3453 11476 3458 11464 3455 11457 3444 11460
3445 11448 3444 11448 3442 11461 3436 11466
3435 11476
$$
PIERCE587
WGUS75 KVEF 040542
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1042 PM PDT MON SEP 3 2012
CAC071-040548-
/O.EXP.KVEF.FF.W.0176.000000T0000Z-120904T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1042 PM PDT MON SEP 3 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM PDT FOR EAST
CENTRAL SAN BERNARDINO COUNTY...
RUNOFF IN THE CHEMEHUEVI WASH AT HIGHWAY 95 SOUTH OF NEEDLES WILL
CONTINUE TO RECEDE AS RAINFALL HAS NOT OCCURRED IN THE DRAINAGE
BASIN SINCE 830 PM PDT. THE FLASH FLOOD WARNING WILL EXPIRE AT 1045
PM PDT.
LAT...LON 3453 11476 3458 11464 3455 11457 3444 11460
3445 11448 3444 11448 3442 11461 3436 11466
3435 11476
$$
PIERCEThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 6:08 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 37 min |
| Sep 3, 6:43 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 63 min |
| Sep 4, 2:00 PM PDT | Flash Flood Warning | VEF | San Bernardino | 65 min |
| Sep 4, 3:44 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
Nearby
Flash 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.