Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 172, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 30, 2012, 4:28 PM PDT for San Bernardino County, California. It was in force for 89 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
- Aug 30, 2012, 4:28 PM PDT (23:28 UTC)
- Expired
- Aug 30, 2012, 5:57 PM PDT
- In force
- 89 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), 91 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 77 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
- 423 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 2679 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 47 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 302328 FFWVEF CAC071-310130- /O.NEW.KVEF.FF.W.0172.120830T2328Z-120831T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 428 PM PDT THU AUG 30 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... EXTREME NORTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 630 PM PDT. * AT 426 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER EXTREME NORTH CENTRAL SAN BERNARDINO COUNTY...OR 26 MILES SOUTHEAST OF SHOSHONE. THE STORM PRODUCING FLASH FLOODING WAS NEARLY STATIONARY. * LOCATIONS IMPACTED INCLUDE... EXCELSIOR MINE 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 3579 11599 3579 11577 3569 11576 3570 11598 $$ JH
1 follow-up statement
225 WGUS75 KVEF 310057 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 557 PM PDT THU AUG 30 2012 CAC071-310106- /O.CAN.KVEF.FF.W.0172.000000T0000Z-120831T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 557 PM PDT THU AUG 30 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME NORTH CENTRAL SAN BERNARDINO COUNTY... NO RAIN HAS FALLEN IN THE WARNING AREA FOR AWHILE AND ANY FLOODING SHOULD HAVE SUBSIDED. LAT...LON 3579 11599 3579 11577 3569 11576 3570 11598 $$ JH
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 5:48 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 87 min |
| Aug 29, 6:38 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 52 min |
| Aug 30, 2:23 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.