Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 67, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 2, 2017, 8:09 PM PDT for San Bernardino County, California. It was in force for 3 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
- Aug 2, 2017, 8:09 PM PDT (03:09 UTC)
- Expired
- Aug 2, 2017, 11:15 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), 88 km from the middle of the area, began a volume at 03:09 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 2, 8:55 PM PDT | FLASH FLOOD | 8 Wnw Needles, CA | CHP REPORTED ROADWAY WASHED OUT ALONG HWY95 APPROXIMATELY 10 MILES WEST OF NEEDLES, AZ DUE TO MINOR FLOODING. |
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 00:00Z, 3.2 hours before the alert went out and 175 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
- 706 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 3193 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
874 WGUS55 KVEF 030309 FFWVEF CAC071-030615- /O.NEW.KVEF.FF.W.0067.170803T0309Z-170803T0615Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Las Vegas NV 809 PM PDT WED AUG 2 2017 The National Weather Service in Las Vegas has issued a * Flash Flood Warning for... East central San Bernardino County in southern California... * Until 1115 PM PDT * At 808 PM PDT, Doppler radar indicated thunderstorms producing heavy rain over Interstate 40, Highway 95, and Goffs Road. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Needles and Highway 95 And I-40. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 3500 11468 3480 11461 3478 11509 3497 11517 $$ Morgan
2 follow-up statements
295 WGUS75 KVEF 030431 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 931 PM PDT WED AUG 2 2017 CAC071-030615- /O.CON.KVEF.FF.W.0067.000000T0000Z-170803T0615Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 931 PM PDT WED AUG 2 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM PDT FOR EAST CENTRAL SAN BERNARDINO COUNTY... At 927 PM PDT, local law enforcement reported flash flooding at Highway 95 and National Trails Highway with the roadway being washed out. Some locations that will experience flooding include... Needles and Highway 95 And I-40. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 3500 11468 3480 11461 3478 11509 3497 11517 $$ Czyzyk
733 WGUS75 KVEF 030614 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 1114 PM PDT WED AUG 2 2017 CAC071-030619- /O.EXP.KVEF.FF.W.0067.000000T0000Z-170803T0615Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 1114 PM PDT WED AUG 2 2017 ...THE FLASH FLOOD WARNING FOR EAST CENTRAL SAN BERNARDINO COUNTY WILL EXPIRE AT 1115 PM PDT... The heavy rain has ended in east central San Bernardino County and flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures and use caution while drivng through the area. LAT...LON 3500 11468 3480 11461 3478 11509 3497 11517 $$ JS
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 5:53 PM PDT | Flash Flood Warning | VEF | Inyo | 2 hr |
| Aug 2, 7:19 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 26 min |
| Aug 2, 7:36 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 2, 8:19 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 2, 8:57 PM PDT | Areal Flood Advisory | VEF | Inyo | 3 hr |
| Aug 2, 9:54 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Aug 2, 10:04 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Aug 2, 11:36 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Aug 3, 2:27 AM PDT | Flash Flood Watch | VEF | Inyo, San Bernardino | 21 hr |
| Aug 3, 6:02 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 3, 7:41 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 3, 8:59 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 3, 2:00 PM PDT | Flash Flood Warning | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.