Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 33, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 24, 2017, 6:54 PM PDT for San Bernardino County, California. It was in force for 3 hr. 3 reports 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 24, 2017, 6:54 PM PDT (01:54 UTC)
- Expired
- Jul 24, 2017, 10:00 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), 118 km from the middle of the area, began a volume at 01:55 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 24, 9:00 PM PDT | FLASH FLOOD | 8 Sw Essex, CA | SAN BERNARDINO COUNTY PUBLIC WORKS REPORTS 14 TIMBER BRIDGES IN THE ESSEX/DANBY AREA ALONG NATIONAL TRAILS HIGHWAY SUSTAINED DAMAGE DUE TO FLOODING. TIME ESTIMATED. |
| Jul 24, 9:11 PM PDT | FLASH FLOOD | 1 Ssw Amboy, CA | CHP REPORTED RDWY WASHED OUT DUE TO FLOODING. |
| Jul 24, 9:11 PM PDT | FLASH FLOOD | Amboy, CA | CHP REPORTED RDWY WASHED OUT DUE TO 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, 1.9 hours before the alert went out and 187 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
- 183 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 2329 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
179 WGUS55 KVEF 250154 FFWVEF CAC071-250500- /O.NEW.KVEF.FF.W.0033.170725T0154Z-170725T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Las Vegas NV 654 PM PDT MON JUL 24 2017 The National Weather Service in Las Vegas has issued a * Flash Flood Warning for... South central San Bernardino County in southern California... * Until 1000 PM PDT * At 653 PM PDT, Doppler radar indicated thunderstorms producing heavy rain over Route 66 between Fenner and Goffs, over National Trails Highway near Essex, and over Amboy Road between Amboy and Sheep Hole Pass. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Essex and Amboy. LAT...LON 3500 11506 3479 11504 3412 11576 3461 11577 $$ Morgan
3 follow-up statements
227 WGUS75 KVEF 250255 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 755 PM PDT MON JUL 24 2017 CAC071-250500- /O.CON.KVEF.FF.W.0033.000000T0000Z-170725T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 755 PM PDT MON JUL 24 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 PM PDT FOR SOUTH CENTRAL SAN BERNARDINO COUNTY... At 753 PM PDT, Doppler radar indicated thunderstorms still producing heavy rain over National Trails Highway between Amboy and Essex, and over Route 66 between Fenner and Goffs. Flash flooding is likely occurring and expected to continue. Some locations that will experience flooding include... Essex and Amboy. PRECAUTIONARY/PREPAREDNESS ACTIONS... Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 3500 11506 3479 11504 3412 11576 3461 11577 $$ Morgan
328 WGUS75 KVEF 250348 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 848 PM PDT MON JUL 24 2017 CAC071-250500- /O.CON.KVEF.FF.W.0033.000000T0000Z-170725T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 848 PM PDT MON JUL 24 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 PM PDT FOR SOUTH CENTRAL SAN BERNARDINO COUNTY... At 846 PM PDT, Doppler radar indicated a thunderstorm with torrential rain between National Trails Highway and Interstate 40 moving east toward Essex. Very heavy rain had already fallen along Amboy Road and National Trails Highway near Amboy. Flash flooding is likely occurring, and more is expected when the storm reaches Essex. Some locations that will experience flooding include... Essex and Amboy. PRECAUTIONARY/PREPAREDNESS ACTIONS... Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 3500 11506 3479 11504 3412 11576 3461 11577 $$ Morgan
602 WGUS75 KVEF 250455 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 955 PM PDT MON JUL 24 2017 CAC071-250503- /O.EXP.KVEF.FF.W.0033.000000T0000Z-170725T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 955 PM PDT MON JUL 24 2017 ...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL SAN BERNARDINO COUNTY WILL EXPIRE AT 1000 PM PDT... Heavy rain was ending in the area from Amboy to Essex. Although no new flooding is expected, Amboy Road was reported to be flooded out and flooding is also possible on National Trails Highway. Please continue to heed any remaining road closures. LAT...LON 3500 11506 3479 11504 3412 11576 3461 11577 $$ Morgan
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 6:30 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 24, 7:40 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 24, 11:59 PM PDT | Flash Flood Watch | VEF | San Bernardino | 20 hr |
| Jul 25, 11:06 AM PDT | Flash Flood Warning | VEF | San Bernardino | 6 hr |
| Jul 25, 11:39 AM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 25, 1:28 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 25, 4:07 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.