Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 55, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 23, 2012, 11:47 AM PDT for 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
- Jul 23, 2012, 11:47 AM PDT (18:47 UTC)
- Expired
- Jul 23, 2012, 2:05 PM PDT
- In force
- 2 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), 62 km from the middle of the area, began a volume at 18:49 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 |
|---|---|---|---|
| Jul 23, 12:30 PM PDT | FLASH FLOOD | 8 Wsw Mountain Pass, CA | TIME OF OCCURRENCE WAS ESTIMATED FROM RADAR. ONGOING FLASH FLOODING WAS OBSERVED ALONG CIMA ROAD JUST SOUTH OF INTERSTATE 15 DURING STORM SURVEY AT 220 PM. 10-12 SIGNIFICANT DEBRIS FLOWS WERE OBSERVED ALONG CIMA ROAD 3 TO 5 MILES SOUTH OF INTERSTATE 15...SOME |
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 12:00Z, 6.8 hours before the alert went out and 106 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
- 177 J/kg
- Mixed-layer CIN
- -137 J/kg
- Mixed-layer LCL
- 2252 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- -22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
880
WGUS55 KVEF 231847
FFWVEF
CAC071-232145-
/O.NEW.KVEF.FF.W.0055.120723T1847Z-120723T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1147 AM PDT MON JUL 23 2012
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEAST SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 245 PM PDT.
* AT 1141 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 14
MILES NORTHWEST OF CIMA TO 9 MILES SOUTH OF NIPTON AND IVANPAH
ROADS...OR ALONG A LINE EXTENDING FROM 14 MILES NORTHWEST OF CIMA
TO 11 MILES NORTHEAST OF CIMA. THE STORMS PRODUCING FLASH FLOODING
WERE NEARLY STATIONARY.
* LOCATIONS IMPACTED INCLUDE...
NIPTON...CIMA...MORNINGSTAR MINE AND IVANPAH ROADS AND NIPTON.
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 3547 11559 3545 11545 3549 11543 3551 11527
3544 11518 3518 11549 3538 11585
$$
JH2 follow-up statements
160
WGUS75 KVEF 231939
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1239 PM PDT MON JUL 23 2012
CAC071-232145-
/O.CON.KVEF.FF.W.0055.000000T0000Z-120723T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1239 PM PDT MON JUL 23 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM PDT FOR
NORTHEAST SAN BERNARDINO COUNTY...
AT 1233 PM PDT...THUNDERSTORMS THAT PROMPTED THE FLASH FLOOD WARNING
HAVE WEAKENED BUT RUNOFF FROM THE HEAVY RAIN EARLIER WILL STILL
LIKELY CREATE FLASH FLOODING. IN ADDITION...MORE STORMS WERE
APPROACHING THE WARNED AREA.
LOCATIONS IMPACTED INCLUDE...
NIPTONCIMA...MORNINGSTAR MINE AND IVANPAH ROADS AND NIPTON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!
REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.
&&
LAT...LON 3547 11559 3545 11545 3549 11543 3551 11527
3544 11518 3518 11549 3538 11585
$$
JH904
WGUS75 KVEF 232105
FFSVEF
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
205 PM PDT MON JUL 23 2012
CAC071-232115-
/O.CAN.KVEF.FF.W.0055.000000T0000Z-120723T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
205 PM PDT MON JUL 23 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEAST SAN
BERNARDINO COUNTY...
THERE HAS BEEN NO RAIN FOR AWHILE FROM CIMA UP TO INTERSTATE 15 AND
UP TO NIPTON AND NO REPORTS OF FLOODING SO THE WARNING HAS BEEN
CANCELLED.
LAT...LON 3547 11559 3545 11545 3549 11543 3551 11527
3544 11518 3518 11549 3538 11585
$$
JHThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 11:17 AM PDT | Areal Flood Advisory | VEF | Inyo | 49 min |
| Jul 23, 12:05 PM PDT | Flash Flood Warning | VEF | Inyo | 115 min |
| Jul 23, 12:12 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Jul 23, 12:18 PM PDT | Flash Flood Warning | VEF | San Bernardino | 117 min |
| Jul 23, 1:54 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 66 min |
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.