Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 160, NWS Las Vegas, NV

August 22, 2012San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 22, 2012, 1:42 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, 2012, 1:42 PM PDT (20:42 UTC)
Expired
Aug 22, 2012, 4:45 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), 87 km from the middle of the area, began a volume at 20:42 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, 3:34 PM PDTFLASH FLOOD16 W Mohave (Azm20), CA1 FOOT OF WATER AND DEBRIS FLOWING ACROSS GOFFS RD. A TRUCK IS STUCK IN THE WATER DUE TO THE 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 12:00Z, 8.7 hours before the alert went out and 176 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 12:00Z on 2012-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 296 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2012-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 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
296 J/kg
Mixed-layer CIN
-130 J/kg
Mixed-layer LCL
1290 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

452 
WGUS55 KVEF 222042
FFWVEF
CAC071-222245-
/O.NEW.KVEF.FF.W.0160.120822T2042Z-120822T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
142 PM PDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 345 PM PDT/345 PM MST/.

* AT 139 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  VERY HEAVY RAIN FROM THUNDERSTORMS NEAR AND NORTH OF INTERSTATE 40 
  IN EASTERN SAN BERNARDINO COUNTY. THESE STORMS WILL LIKELY CAUSE 
  FLOODING OF HIGHWAY 95 AND NEEDLES HIGHWAY.

* LOCATIONS IMPACTED INCLUDE...
  HIGHWAY 95 NORTH OF INTERSTATE 40 AND NEEDLES HIGHWAY.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 120 AND 143.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3484 11500 3526 11495 3500 11463 3496 11464
      3493 11462 3487 11464 3485 11461 3481 11460

$$

MORGAN
3 follow-up statements
652 
WGUS75 KVEF 222138
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
238 PM PDT WED AUG 22 2012

CAC071-222245-
/O.CON.KVEF.FF.W.0160.000000T0000Z-120822T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
238 PM PDT WED AUG 22 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM PDT FOR EAST 
CENTRAL SAN BERNARDINO COUNTY...

AT 234 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS WITH HEAVY RAIN MOVING NORTH ALONG HIGHWAY 95 
AND NEEDLES HIGHWAY NORTH OF INTERSTATE 40. THESE STORMS WERE MOVING 
OVER AREAS WHICH HAD ALREADY RECEIVED HEAVY RAIN...AND FLOODING OF 
HIGHWAY 95 AND NEEDLES HIGHWAY REMAINS LIKELY.

LOCATIONS IMPACTED INCLUDE...
HIGHWAY 95 AND NEEDLES HIGHWAY.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 120 AND 143.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3484 11500 3526 11495 3500 11463 3496 11464
      3493 11462 3487 11464 3485 11461 3481 11460

$$

MORGAN
219 
WGUS55 KVEF 222240
FFWVEF
CAC071-222345-
/O.EXT.KVEF.FF.W.0160.000000T0000Z-120822T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
340 PM PDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS EXTENDED THE

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

* UNTIL 445 PM PDT.

* AT 335 PM PDT...A TRAINED WEATHER SPOTTER REPORTED FLASH FLOODING 
  ON GOFFS ROAD...WITH A TRUCK STUCK IN THE WATER. RADAR INDICATED 
  THAT PERIODS OF HEAVY RAIN WOULD CONTINUE AT LEAST THROUGH 430 PM 
  PDT.

* LOCATIONS IMPACTED INCLUDE...
  GOFFS ROAD...NEEDLES HIGHWAY...HIGHWAY 95 NORTH OF INTERSTATE 40.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 120 AND 143.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3484 11500 3526 11495 3500 11463 3496 11464
      3493 11462 3487 11464 3485 11461 3481 11460

$$

MORGAN
034 
WGUS75 KVEF 222338
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
438 PM PDT WED AUG 22 2012

CAC071-222345-
/O.EXP.KVEF.FF.W.0160.000000T0000Z-120822T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
438 PM PDT WED AUG 22 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 445 PM PDT FOR EAST 
CENTRAL SAN BERNARDINO COUNTY...

AT 435 PM PDT...RADAR INDICATED THAT RAIN WAS BEGINNING TO LET UP ON 
NEEDLES HIGHWAY AND HIGHWAY 95 NORTH OF INTERSTATE 40. NO REPORTS OF 
FLOODING HAD BEEN RECEIVED SINCE 340 PM PDT...SO THE FLASH FLOOD 
WARNING WILL BE ALLOWED TO EXPIRE.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 120 AND 143.

LAT...LON 3484 11500 3526 11495 3500 11463 3496 11464
      3493 11462 3487 11464 3485 11461 3481 11460

$$

MORGAN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 7:57 PM PDTSevere Thunderstorm WarningVEFSan Bernardino48 min
Aug 22, 3:53 AM PDTAreal Flood AdvisoryVEFInyo3 hr
Aug 22, 9:19 AM PDTAreal Flood AdvisoryVEFInyo, San Bernardino3 hr
Aug 22, 9:34 AM PDTFlash Flood WarningVEFInyo, San Bernardino116 min
Aug 22, 9:45 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 22, 10:05 AM PDTSevere Thunderstorm WarningVEFSan Bernardino25 min
Aug 22, 10:45 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 22, 10:49 AM PDTFlash Flood WarningVEFSan Bernardino116 min
Aug 22, 11:27 AM PDTSevere Thunderstorm WarningVEFSan Bernardino48 min
Aug 22, 11:30 AM PDTFlash Flood WarningVEFSan Bernardino56 min
Aug 22, 11:50 AM PDTFlash Flood WarningVEFSan Bernardino54 min
Aug 22, 11:58 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 22, 1:03 PM PDTFlash Flood WarningVEFSan Bernardino87 min
Aug 22, 1:47 PM PDTFlash Flood WarningVEFInyo36 min
Aug 22, 1:50 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Aug 22, 1:55 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 2:57 PM PDTFlash Flood WarningVEFInyo2 hr
Aug 22, 3:55 PM PDTFlash Flood WarningVEFInyo65 min

Nearby

Flash Flood Warnings in California, 2012Every flash flood warning in 2012

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.