Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 99, NWS Las Vegas, NV

August 22, 2016San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 22, 2016, 5:45 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 22, 2016, 5:45 PM PDT (00:45 UTC)
Expired
Aug 22, 2016, 8:45 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), 95 km from the middle of the area, began a volume at 00:48 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

TimeReportWhereRemark
Aug 22, 7:28 PM PDTFLASH FLOOD8 Wnw Needles, CAROADWAY FLOODING ON HIGHWAY 95 NEAR I-40. ROAD NOT CLOSED BUT SOME CARS WERE BEING WASHED OFF ROAD BUT ABLE TO GET BACK ON THE HIGHWAY. ROCK IN THE ROADWAY. .

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, 0.8 hours before the alert went out and 184 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.

Skew-T log-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2016-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 472 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2016-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
472 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
3384 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

573 
WGUS55 KVEF 230045
FFWVEF
CAC071-230345-
/O.NEW.KVEF.FF.W.0099.160823T0045Z-160823T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
545 PM PDT MON AUG 22 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...

* UNTIL 845 PM PDT

* AT 541 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN OVER GOFFS ROAD TO NEEDLES INCLUDING HIGHWAY 95
  INTERSECTION WITH GOFFS ROAD. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  NEEDLES...HIGHWAY 95 AND GOFFS ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3522 11492 3500 11464 3487 11464 3483 11458
      3477 11456 3471 11447 3458 11442 3457 11522

$$

JS
2 follow-up statements
017 
WGUS75 KVEF 230219
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
719 PM PDT MON AUG 22 2016

CAC071-230345-
/O.CON.KVEF.FF.W.0099.000000T0000Z-160823T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
719 PM PDT MON AUG 22 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM PDT FOR
EAST CENTRAL SAN BERNARDINO COUNTY...

AT 718 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS CONTINUING TO
PRODUCE HEAVY RAIN ACROSS THE WARNED AREA. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
NEEDLES...GOFFS ROAD 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 3522 11492 3500 11464 3487 11464 3483 11458
      3477 11456 3471 11447 3458 11442 3457 11522

$$

JS
098 
WGUS75 KVEF 230249
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
749 PM PDT MON AUG 22 2016

CAC071-230345-
/O.CON.KVEF.FF.W.0099.000000T0000Z-160823T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
749 PM PDT MON AUG 22 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM PDT FOR
EAST CENTRAL SAN BERNARDINO COUNTY...

AT 747 PM PDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING ON
HIGHWAY 95 NEAR INTERSTATE 40. VEHICLES ARE BEING WASHED OFF THE
ROAD FROM SWIFTLY FLOWING WATER. AVOID TRAVEL IN THIS AREA!

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.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3522 11492 3500 11464 3487 11464 3483 11458
      3477 11456 3471 11447 3458 11442 3457 11522

$$

CMS

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 22, 6:20 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 8:31 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 8:46 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 9:44 PM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr

Nearby

Flash Flood Warnings in California, 2016Every flash flood warning in 2016

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.