Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 68, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 10:08 AM PDT for San Bernardino County, California. It was in force for 112 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2012, 10:08 AM PDT (17:08 UTC)
- Expired
- Jul 31, 2012, 12:00 PM PDT
- In force
- 112 min
- 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), 164 km from the middle of the area, began a volume at 17:08 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 12:00Z, 5.1 hours before the alert went out and 220 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
- 121 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1334 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- -43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
415 WGUS55 KVEF 311708 FFWVEF CAC071-311900- /O.NEW.KVEF.FF.W.0068.120731T1708Z-120731T1900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1008 AM PDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL NOON PDT. * AT 1004 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN OVER AMBOY ROAD BETWEEN AMBOY AND SHEEP HOLE PASS. WASHES IN THE AREA ARE LIKELY TO FLOOD THE ROAD. * LOCATIONS IMPACTED INCLUDE... AMBOY ROAD. 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 3457 11581 3454 11567 3417 11564 3418 11580 $$ MORGAN
2 follow-up statements
155 WGUS75 KVEF 311800 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1100 AM PDT TUE JUL 31 2012 CAC071-311900- /O.CON.KVEF.FF.W.0068.000000T0000Z-120731T1900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 1100 AM PDT TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL NOON PDT FOR SOUTH CENTRAL SAN BERNARDINO COUNTY... AT 1056 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE RAIN OVER AMBOY ROAD...MAINLY NEAR SHEEP HOLE PASS. FLOODING OF WASHES IN THE AREA REMAINS LIKELY. LOCATIONS IMPACTED INCLUDE... AMBOY ROAD. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3457 11581 3454 11567 3417 11564 3418 11580 $$ MORGAN
816 WGUS75 KVEF 311907 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1207 PM PDT TUE JUL 31 2012 CAC071-311916- /O.EXP.KVEF.FF.W.0068.000000T0000Z-120731T1900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 1207 PM PDT TUE JUL 31 2012 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTH CENTRAL SAN BERNARDINO COUNTY... THE FLASH FLOOD WARNING FOR HIGHWAY 62 JUST EAST OF TWENTYNINE PALMS HAS EXPIRED...BUT HAS BEEN REPLACED BY A NEW WARNING VALID UNTIL 2 PM. LAT...LON 3457 11581 3454 11567 3417 11564 3418 11580 $$ MORGAN
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:54 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 51 min |
| Jul 31, 2:29 AM PDT | Flash Flood Watch | VEF | San Bernardino | 19 hr |
| Jul 31, 10:00 AM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 31, 10:38 AM PDT | Flash Flood Warning | VEF | San Bernardino | 94 min |
| Jul 31, 11:58 AM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 31, 12:03 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 31, 1:30 PM PDT | Flash Flood Warning | VEF | San Bernardino | 49 min |
| Jul 31, 2:00 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 31, 3:05 PM PDT | Flash Flood Warning | VEF | San Bernardino | 42 min |
| Jul 31, 3:25 PM PDT | Flash Flood Warning | VEF | San Bernardino | 65 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.