Alert archive / California / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 39, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 2, 2017, 6:58 PM PDT for San Bernardino County, California; Clark County, Nevada; Mohave County, Arizona. It was in force for 47 min. 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
- Sep 2, 2017, 6:58 PM PDT (01:58 UTC)
- Expired
- Sep 2, 2017, 7:45 PM PDT
- In force
- 47 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV
The radar
The Las Vegas radar (KESX), 29 km from the middle of the area, began a volume at 02:00 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 |
|---|---|---|---|
| Sep 2, 7:31 PM PDT | TSTM WND DMG | Cottonwood Cove, NV | *** 1 FATAL *** LAKE MEAD DISPATCH CENTER REPORTED A DEATH CAUSED BY CONDITIONS BROUGHT ABOUT FROM THE HIGH WINDS ASSOCIATED WITH SEVERE THUNDERSTORM ACTIVITY. AN ADULT MALE BECAME ENTANGLED IN THE MOORING LINE OF A HOUSE BOAT THAT BROKE LOOSE DURING HIGH WIND |
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, 2.0 hours before the alert went out and 124 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
- 326 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 3748 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
895 WUUS55 KVEF 030158 SVRVEF AZC015-CAC071-NVC003-030245- /O.NEW.KVEF.SV.W.0039.170903T0158Z-170903T0245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Las Vegas NV 658 PM PDT SAT SEP 2 2017 The National Weather Service in Las Vegas has issued a * Severe Thunderstorm Warning for... West central Mohave County in northwestern Arizona... Eastern San Bernardino County in southern California... South central Clark County in southern Nevada... * Until 745 PM PDT/745 PM MST/ * At 654 PM PDT/654 PM MST/, outflow from a severe thunderstorm was located 12 miles east of Cottonwood Cove, or 19 miles north of Laughlin, moving west at 30 mph. Strong winds are expected on Lake Mohave by 715 PM. HAZARD...50 to 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Dangerous boating conditions due to strong winds. * Locations impacted include... Lake Mohave, Laughlin, Katherine Landing, Cottonwood Cove, Cottonwood Cove Campground, Big Bend Rec Area, Mohave Valley and Willow Beach. PRECAUTIONARY/PREPAREDNESS ACTIONS... If on or near Lake Mohave, get away from the water and move indoors or inside a vehicle. Remember, lightning can strike out to 15 miles from the parent thunderstorm. If you can hear thunder, you are close enough to be struck by lightning. Move to safe shelter now! Do not be caught on the water in a thunderstorm. && LAT...LON 3589 11464 3502 11449 3499 11464 3588 11479 TIME...MOT...LOC 0154Z 091DEG 24KT 3543 11448 HAIL...<.75IN WIND...60MPH $$ JS
2 follow-up statements
831 WWUS55 KVEF 030227 SVSVEF Severe Weather Statement National Weather Service Las Vegas NV 727 PM PDT SAT SEP 2 2017 AZC015-CAC071-NVC003-030245- /O.CON.KVEF.SV.W.0039.000000T0000Z-170903T0245Z/ Mohave AZ-San Bernardino CA-Clark NV- 727 PM PDT SAT SEP 2 2017 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM PDT/745 PM MST/ FOR WEST CENTRAL MOHAVE...EASTERN SAN BERNARDINO AND SOUTH CENTRAL CLARK COUNTIES... At 724 PM PDT/724 PM MST/, an outflow boundary generated by thunderstorms over west central Mohave County was pushing across the Colorado River Valley, including Lake Mohave, at around 715 PM and continued to move west at 30 mph. HAZARD...50 to 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Dangerous boating conditions due to strong winds. Locations impacted include... Lake Mohave, Bullhead City, Laughlin, Katherine Landing, Cottonwood Cove, Cottonwood Cove Campground, Big Bend Rec Area, Mohave Valley and Willow Beach. PRECAUTIONARY/PREPAREDNESS ACTIONS... If on or near Lake Mohave, get away from the water and move indoors or inside a vehicle. remember, lightning can strike out to 15 miles from the parent thunderstorm. If you can hear thunder, you are close enough to be struck by lightning. Move to safe shelter now! Do not be caught on the water in a thunderstorm. && LAT...LON 3589 11464 3502 11449 3499 11464 3588 11479 TIME...MOT...LOC 0224Z 091DEG 24KT 3543 11473 HAIL...<.75IN WIND...60MPH $$ JS
606
WWUS55 KVEF 030250
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
750 PM PDT SAT SEP 2 2017
AZC015-CAC071-NVC003-030257-
/O.EXP.KVEF.SV.W.0039.000000T0000Z-170903T0245Z/
Mohave AZ-San Bernardino CA-Clark NV-
750 PM PDT SAT SEP 2 2017
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MOHAVE...EASTERN
SAN BERNARDINO AND SOUTH CENTRAL CLARK COUNTIES HAS EXPIRED...
The outflow from thunderstorms which prompted the warning has moved
west of the warned area however, strong gusty winds 40 to 50 MPH are
still likely along the Colorado River Valley through 815 PM.
LAT...LON 3589 11464 3502 11449 3499 11464 3588 11479
TIME...MOT...LOC 0247Z 091DEG 24KT 3543 11490
$$
JSThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 3:18 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 3, 4:24 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Sep 2, 6:14 PM PDT | Areal Flood Advisory | VEF | Mohave | 3 hr |
| Sep 2, 6:18 PM PDT | Severe Thunderstorm Warning | VEF | Mohave | 42 min |
| Sep 3, 2:42 PM PDT | Severe Thunderstorm Warning | VEF | Mohave | 24 min |
| Sep 3, 4:45 PM PDT | Areal Flood Advisory | VEF | Mohave | 3 hr |
Nearby
Severe Thunderstorm Warnings in California, 2017Severe Thunderstorm Warnings in Nevada, 2017Severe Thunderstorm Warnings in Arizona, 2017Every severe thunderstorm 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.