Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 18, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 19, 2017, 7:53 AM 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
- Jul 19, 2017, 7:53 AM PDT (14:53 UTC)
- Expired
- Jul 19, 2017, 10:45 AM 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), 101 km from the middle of the area, began a volume at 14:55 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.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 2.9 hours before the alert went out and 177 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
- 539 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 2329 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
590 WGUS55 KVEF 191453 FFWVEF CAC071-191745- /O.NEW.KVEF.FF.W.0018.170719T1453Z-170719T1745Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Las Vegas NV 753 AM PDT WED JUL 19 2017 The National Weather Service in Las Vegas has issued a * Flash Flood Warning for... Eastern San Bernardino County in southern California... * Until 1045 AM PDT * At 751 AM PDT, Doppler radar indicated thunderstorms producing heavy rain on National Trails Highway just west of Essex. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Essex...National Trails Highway...Route 66 south of Fenner. 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 3486 11506 3480 11505 3473 11525 3483 11527 $$ Morgan
2 follow-up statements
199 WGUS75 KVEF 191629 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 929 AM PDT WED JUL 19 2017 CAC071-191745- /O.CON.KVEF.FF.W.0018.000000T0000Z-170719T1745Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 929 AM PDT WED JUL 19 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 AM PDT FOR EASTERN SAN BERNARDINO COUNTY... At 924 AM PDT, Doppler radar indicated the heavy rain has diminished but runoff and flooding from the earlier rain is expected through 1045 AM PDT. Some locations that will experience flooding include... Essex. PRECAUTIONARY/PREPAREDNESS ACTIONS... Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 3486 11506 3480 11505 3473 11525 3483 11527 $$ Czyzyk
442 WGUS75 KVEF 191738 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 1038 AM PDT WED JUL 19 2017 CAC071-191746- /O.EXP.KVEF.FF.W.0018.000000T0000Z-170719T1745Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 1038 AM PDT WED JUL 19 2017 ...THE FLASH FLOOD WARNING FOR EASTERN SAN BERNARDINO COUNTY WILL EXPIRE AT 1045 AM PDT... The heavy rain has ended and any flood waters should have receded. Therefore the flash flood warning will be allowed to expire at 1045 AM PDT. Please continue to heed any remaining road closures. LAT...LON 3486 11506 3480 11505 3473 11525 3483 11527 $$ Czyzyk
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 6:01 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 18, 7:58 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Jul 19, 8:53 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 19, 9:57 AM 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.