Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 99, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 31, 2017, 4:08 PM PDT for San Bernardino County, California. It was in force for 3 hr. 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 31, 2017, 4:08 PM PDT (23:08 UTC)
- Expired
- Aug 31, 2017, 7:00 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), 83 km from the middle of the area, began a volume at 23:09 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, 11.1 hours before the alert went out and 136 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
- 27 J/kg
- Mixed-layer CIN
- -370 J/kg
- Mixed-layer LCL
- 2599 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
592 WGUS55 KVEF 312308 FFWVEF CAC071-010200- /O.NEW.KVEF.FF.W.0099.170831T2308Z-170901T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Las Vegas NV 408 PM PDT THU AUG 31 2017 The National Weather Service in Las Vegas has issued a * Flash Flood Warning for... Northeastern San Bernardino County in southern California... * Until 700 PM PDT * At 406 PM PDT, Doppler radar indicated thunderstorms producing heavy rain south of Cima. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Cima, Kelso Cima Road, Cedar Canyon Road, and Elora. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 3503 11552 3510 11567 3532 11552 3528 11536 $$ AA
2 follow-up statements
603 WGUS75 KVEF 010024 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 524 PM PDT THU AUG 31 2017 CAC071-010200- /O.CON.KVEF.FF.W.0099.000000T0000Z-170901T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 524 PM PDT THU AUG 31 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM PDT FOR NORTHEASTERN SAN BERNARDINO COUNTY... At 524 PM PDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is expected to begin shortly. Some locations that will experience flooding include... Cima, Kelso Cima Road, Cedar Canyon Road, and Elora. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 3503 11552 3510 11567 3532 11552 3528 11536 $$ AA
761 WGUS75 KVEF 010151 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 651 PM PDT THU AUG 31 2017 CAC071-010200- /O.EXP.KVEF.FF.W.0099.000000T0000Z-170901T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 651 PM PDT THU AUG 31 2017 ...THE FLASH FLOOD WARNING FOR NORTHEASTERN SAN BERNARDINO COUNTY WILL EXPIRE AT 700 PM PDT... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 3503 11552 3510 11567 3532 11552 3528 11536 $$ AA
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 2:31 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
Nearby
Flash Flood Warnings in California, 2017Every flash flood warning in 2017
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.