Alert archive / California / Flash Flood Warnings in 2011

Flash Flood Warning 15, NWS Las Vegas, NV

July 5, 2011San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 5, 2011, 1:48 PM 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 5, 2011, 1:48 PM PDT (20:48 UTC)
Expired
Jul 5, 2011, 4:19 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), 56 km from the middle of the area, began a volume at 20:52 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, 8.8 hours before the alert went out and 90 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 2011-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2419 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

617 
WGUS55 KVEF 052048
FFWVEF
CAC071-052345-
/O.NEW.KVEF.FF.W.0015.110705T2048Z-110705T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
148 PM PDT TUE JUL 5 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 445 PM PDT.

* AT 145 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR MOUNTAIN PASS. THE STORM 
  PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...INTERSTATE 15 FROM MILE MARKER 275 
  EAST TO THE NEVADA BORDER...INCLUDING...MOUNTAIN PASS.

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3564 11558 3566 11546 3558 11536 3548 11537
      3542 11559

$$

SC
2 follow-up statements
853 
WGUS75 KVEF 052127
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
227 PM PDT TUE JUL 5 2011

CAC071-052345-
/O.CON.KVEF.FF.W.0015.000000T0000Z-110705T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
227 PM PDT TUE JUL 5 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM PDT FOR NORTH
CENTRAL SAN BERNARDINO COUNTY...

AT 221 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM RADAR ESTIMATES HAS PRODUCED THREE INCHES OF 
RAIN SINCE 130 PM.  THIS STORM WAS LOCATED NEAR MOUNTAIN PASS...OR 
13 MILES SOUTHWEST OF PRIMM. THE THUNDERSTORM WITH EXCESSIVE RAIN 
WAS NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...MOUNTAIN PASS...INTERSTATE 15 BETWEEN 
MILE MARKER 275 AND THE NEVADA CALIFORNIA BORDER.

LAT...LON 3564 11558 3566 11546 3558 11536 3548 11537
      3542 11559

$$

JGG
382 
WGUS75 KVEF 052319
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
419 PM PDT TUE JUL 5 2011

CAC071-052328-
/O.CAN.KVEF.FF.W.0015.000000T0000Z-110705T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
419 PM PDT TUE JUL 5 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTH CENTRAL SAN
BERNARDINO COUNTY...

THUNDERSTORMS HAVE DECREASED IN THE AREA AND ALTHOUGH LIGHT RAINFALL 
MAY BE SEEN INTO THE EVENING...ANY ADDITIONAL RAINFALL IS NOT 
EXPECTED TO CREATE ANY FURTHER FLOOD PROBLEMS. THUS THE FLASH FLOOD 
WARNING HAS BEEN CANCELLED.

LAT...LON 3564 11558 3566 11546 3558 11536 3548 11537
      3542 11559

$$

JENSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 5:46 PM PDTFlash Flood WarningVEFInyo119 min
Jul 4, 6:52 PM PDTFlash Flood WarningVEFInyo113 min
Jul 5, 1:37 PM PDTFlash Flood WarningVEFSan Bernardino113 min
Jul 5, 2:01 PM PDTSevere Thunderstorm WarningVEFSan Bernardino33 min
Jul 5, 2:06 PM PDTSevere Thunderstorm WarningVEFSan Bernardino24 min

Nearby

Flash Flood Warnings in California, 2011Every flash flood warning in 2011

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.