Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 80, NWS Las Vegas, NV

August 4, 2016San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 4, 2016, 5:03 PM PDT for San Bernardino County, California. It was in force for 6 hr. 2 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: Aug 4, 2016, 5:03 PM PDT (00:03 UTC)
Expired: Aug 4, 2016, 11:00 PM PDT
In force: 6 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), 92 km from the middle of the area, began a volume at 00:04 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 4, 6:46 PM PDT	FLASH FLOOD	2 Ne Essex, CA	CALIFORNIA HIGHWAY PATROL REPORTS NATIONAL TRAILS HIGHWAY AND GOFFS ROAD FLOODED WITH LARGE AMOUNT OF DEBRIS. ROAD NOW CLOSED.
Aug 4, 8:00 PM PDT	FLASH FLOOD	6 Nw Essex, CA	TWO FEET OF STANDING WATER REPORTED ON ESSEX ROAD. ROAD WAS CLOSED AT 830 PM PDT FROM INTERSTATE 40 TO NATIONAL TRAILS HIGHWAY.

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, 0.1 hours before the alert went out and 154 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 9 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 2065 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

892 
WGUS55 KVEF 050003
FFWVEF
CAC071-050600-
/O.NEW.KVEF.FF.W.0080.160805T0003Z-160805T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
503 PM PDT THU AUG 4 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

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

* UNTIL 1100 PM PDT

* AT 502 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE MOJAVE NATIONAL PRESERVE...ESPECIALLY NEAR
  THE BLACK CANYON AND HOLE IN THE WALL CAMPGROUNDS. FLASH FLOODING
  IS EXPECTED TO BEGIN SHORTLY. THIS WATER MAY FLOW SOUTH TO ESSEX
  WHERE IT CROSSES NATIONAL TRAILS HIGHWAY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  KELSO...BLACK CANYON EQUESTRIAN CAMPGROUND...
  HOLE IN THE WALL CAMPGROUND...
  MID HILLS CAMPGROUND AND ESSEX. NATIONAL TRAILS HIGHWAY NEAR ESSEX.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 3523 11531 3499 11521 3475 11516 3465 11530
      3495 11549 3494 11575 3521 11589

$$

WOLCOTT

3 follow-up statements

786 
WGUS75 KVEF 050252
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
752 PM PDT THU AUG 4 2016

CAC071-050600-
/O.CON.KVEF.FF.W.0080.000000T0000Z-160805T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
752 PM PDT THU AUG 4 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM PDT FOR
CENTRAL SAN BERNARDINO COUNTY...

AT 749 PM PDT...LOCAL LAW ENFORCEMENT REPORTED HEAVY RAIN DUE TO
THUNDERSTORMS OVER THE MOJAVE NATIONAL PRESERVE.  FLASH FLOODING WAS
ONGOING ACROSS NATIONAL TRAILS HIGHWAY NEAR ESSEX. FLOODING IS ALSO
LIKELY ONGOING NEAR THE BLACK CANYON AND HOLE IN THE WALL
CAMPGROUNDS.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
KELSO...BLACK CANYON EQUESTRIAN CAMPGROUND...HOLE IN THE WALL
CAMPGROUND...MID HILLS CAMPGROUND AND ESSEX.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 3523 11531 3499 11521 3475 11516 3465 11530
      3495 11549 3494 11575 3521 11589

$$

WOLCOTT

028 
WGUS75 KVEF 050255
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
755 PM PDT THU AUG 4 2016

CAC071-050600-
/O.CON.KVEF.FF.W.0080.000000T0000Z-160805T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
755 PM PDT THU AUG 4 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM PDT FOR
CENTRAL SAN BERNARDINO COUNTY...

AT 753 PM PDT...RAIN HAD ENDED OVER THE MOJAVE NATIONAL PRESERVE.
HOWEVER...LOCAL LAW ENFORCEMENT HAS REPORTED FLOODING WAS ONGOING
ACROSS NATIONAL TRAILS HIGHWAY NEAR ESSEX. FLOODING IS ALSO LIKELY
ONGOING NEAR THE BLACK CANYON AND HOLE IN THE WALL CAMPGROUNDS AND
NEARBY AREAS IN THE MOJAVE NATIONAL PRESERVE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
KELSO...BLACK CANYON EQUESTRIAN CAMPGROUND...HOLE IN THE WALL
CAMPGROUND...MID HILLS CAMPGROUND AND ESSEX.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 3523 11531 3499 11521 3475 11516 3465 11530
      3495 11549 3494 11575 3521 11589

$$

WOLCOTT

846 
WGUS75 KVEF 050550
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1050 PM PDT THU AUG 4 2016

CAC071-050600-
/O.EXP.KVEF.FF.W.0080.000000T0000Z-160805T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1050 PM PDT THU AUG 4 2016

...THE FLASH FLOOD WARNING FOR CENTRAL SAN BERNARDINO COUNTY WILL
EXPIRE AT 1100 PM PDT...

THE HEAVY RAIN HAS ENDED AND FLASH FLOODING IS NO LONGER EXPECTED TO
POSE A THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3523 11531 3499 11521 3475 11516 3465 11530
      3495 11549 3494 11575 3521 11589

$$

OUTLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 6:18 PM PDT	Areal Flood Advisory	VEF	Inyo	3 hr

Nearby

Flash Flood Warnings in California, 2016 Every 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.