Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 118, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 17, 2012, 2:48 PM PDT for San Bernardino County, California. It was in force for 102 min. 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
- Aug 17, 2012, 2:48 PM PDT (21:48 UTC)
- Expired
- Aug 17, 2012, 4:30 PM PDT
- In force
- 102 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The radar
The Santa Ana Mts radar (KSOX), 136 km from the middle of the area, began a volume at 21:47 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 |
|---|---|---|---|
| Aug 17, 2:50 PM PDT | HEAVY RAIN 0.5 | 3 Ese Joshua Tree, CA | SPOTTER REPORTS AN ESTIMATED HALF INCH OF RAIN FELL IN A 10 MINUTE PERIOD ENDING AT 1450 PDT. |
| Aug 17, 4:30 PM PDT | HEAVY RAIN 1.25 | 2 Sw Twentynine Palms, CA | 1.25 INCES OF RAIN FELL IN A 40 MINUTE PERIOD. SPOTTER REPORTS 2 INCHES OF WATER FLOWING ACROSS ADOBE ROAD IN TWENTYNINE PALMS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Edwards AFB, CA (KEDW), launched 12:00Z, 9.8 hours before the alert went out and 169 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
- 3028 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
931
WGUS55 KVEF 172148
FFWVEF
CAC071-172345-
/O.NEW.KVEF.FF.W.0118.120817T2148Z-120817T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
248 PM PDT FRI AUG 17 2012
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 445 PM PDT.
* AT 235 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM NEAR JOSHUA TREE...OR 2 MILES
EAST OF YUCCA VALLEY THE STORM PRODUCING VERY HEAVY RAIN WAS
NEARLY STATIONARY.
* LOCATIONS IMPACTED INCLUDE...ROUTE 62 FROM TWENTYNINE PALMS TO
JOSHUA TREE AND WEST ALONG ROUTE 62 TO AVALON AVENUE TOWARDS YUCCA
VALLEY.
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 3418 11638 3419 11603 3411 11604 3411 11605
3412 11606 3412 11626 3408 11627 3408 11639
$$
KENNEDY2 follow-up statements
788
WGUS75 KVEF 172231
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
331 PM PDT FRI AUG 17 2012
CAC071-172345-
/O.CON.KVEF.FF.W.0118.000000T0000Z-120817T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
331 PM PDT FRI AUG 17 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...
AT 320 PM PDT...HEAVY RAIN HAD LARGELY SUBSIDED BETWEEN TWENTYNINE
PALMS AND YUCCA VALLEY...HOWEVER...A TRAINED STORM SPOTTER IN JOSHUA
TREE REPORTED 0.50 INCHES OF RAIN FELL IN 10 MINUTES...WHICH
COINCIDES WELL WITH RADAR PRECIPITATION ESTIMATES. RADAR ESTIMATES
SHOW UP TO 2 INCHES OF RAINFALL ACROSS BASINS JUST SOUTH OR ROUTE 62
WHICH ALL FLOW NORTH TOWARDS THE ROADWAY AND WILL LIKELY IMPACT
KNOWN LOW WATER CROSSINGS ALONG ROUTE 62 SUCH AS MILE
SQUARE...SUNBURST...SUNNY VISTA...AND YUCCA MESA ROADS.
LOCATIONS IMPACTED INCLUDE...ROUTE 62 FROM TWENTYNINE PALMS TO
JOSHUA TREE AND WEST ALONG ROUTE 62 TO AVALON AVENUE TOWARDS YUCCA
VALLEY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR
WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3418 11638 3419 11603 3411 11604 3411 11605
3412 11606 3412 11626 3408 11627 3408 11639
$$
KENNEDY385
WGUS75 KVEF 172330
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
430 PM PDT FRI AUG 17 2012
CAC071-172339-
/O.CAN.KVEF.FF.W.0118.000000T0000Z-120817T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
430 PM PDT FRI AUG 17 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL SAN
BERNARDINO COUNTY...
LAT...LON 3418 11638 3419 11603 3411 11604 3411 11605
3412 11606 3412 11626 3408 11627 3408 11639
NO SIGNIFICANT RAINFALL HAS BEEN OBSERVED BETWEEN YUCCA VALLEY AND
TWENTYNINE PALMS FOR THE PAST 50 MINUTES...AND ANY WATER FLOWING IN
NORMALLY DRY WASHES OR IMPACTING ANY LOW WATER CROSSING SHOULD BE
SUBSIDING. THEREFORE...THE FLASH FLOOD WARNING IS CANCELLED.
$$
KENNEDYThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 11:23 AM PDT | Flash Flood Watch | VEF | San Bernardino | 8 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.