Alert archive / California / Flash Flood Watches in 2006

Flash Flood Watch 4, NWS Las Vegas, NV

July 17, 2006San Bernardino County, California

NWS Las Vegas, NV issued this flash flood watch at Jul 17, 2006, 2:32 PM PDT for San Bernardino County, California. It took effect at Jul 18, 2006, 12:00 PM PDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Jul 17, 2006, 2:32 PM PDT (21:32 UTC)
In effect from
Jul 18, 2006, 12:00 PM PDT
Expired
Jul 18, 2006, 6:15 PM PDT
In force
6 hr
Issued by
NWS Las Vegas, NV
Flood severity
None

County San Bernardino County, CA

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 9.5 hours before the alert went out and 198 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, Mercury/Desert R, NV at 12:00Z on 2006-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 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, Mercury/Desert R, NV at 12:00Z on 2006-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -96 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
22 J/kg
Mixed-layer CIN
-475 J/kg
Mixed-layer LCL
3872 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-96 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood watch went out at Jul 17, 3:00 AM PDT, 11 hours 32 minutes earlier.

Area forecast discussion, Jul 17, 3:00 AM PDT, 11 hours 32 minutes before
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Hazardous weather outlook, Jul 17, 10:30 AM PDT, 4 hours 2 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
1030 AM PDT MON JUL 17 2006

AZZ001>003-036-CAZ519>527-NVZ014>022-181730-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-EASTERN SIERRA SLOPES-
OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
DEATH VALLEY NATIONAL PARK-WESTERN MOJAVE DESERT-
EASTERN MOJAVE DESERT-MORONGO BASIN-CADIZ BASIN-
SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-
ESMERALDA AND CENTRAL NYE COUNTY-LINCOLN COUNTY-
NORTHEAST CLARK COUNTY-WESTERN CLARK AND SOUTHERN NYE COUNTY-
SHEEP RANGE-SPRING MOUNTAINS-LAS VEGAS VALLEY-
SOUTHERN CLARK COUNTY-
1030 AM PDT MON JUL 17 2006 /1030 AM MST MON JUL 17 2006/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
ARIZONA...CALIFORNIA AND SOUTHERN NEVADA.

.DAY ONE...TODAY AND TONIGHT
MONSOON MOISTURE WILL PRODUCE SCATTERED THUNDERSTORMS AGAIN THIS
AFTERNOON THROUGH TONIGHT. THE GREATEST COVERAGE OF STORMS IS
EXPECTED TO BE SOUTHEAST OF A LINE FROM COLORADO CITY ARIZONA...TO
HENDERSON NEVADA...TO BARSTOW CALIFORNIA. THE MAIN THREATS FROM
THESE STORMS WILL BE DAMAGING WINDS...CLOUD TO GROUND
LIGHTNING...AND LOCALLY HEAVY RAIN. THERE IS A VERY HIGH RISK OF
FLASH FLOODING...MUD SLIDES...AND DEBRIS FLOWS WITH ANY STORMS
WHICH DEVELOP OVER THE SAWTOOTH AND MILLARD BURN AREAS NEAR THE
MORONGO BASIN.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
SCATTERED THUNDERSTORMS WILL CONTINUE EACH DAY...WITH GREATER
COVERAGE IN THE AFTERNOONS AND EVENINGS. TOWARDS THE END OF THE
WEEK...THE STORMS MAY BECOME SLOW MOVERS...WHICH WOULD INCREASE
THE RISK OF FLASH FLOODING.

.SPOTTER INFORMATION STATEMENT...
SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER.

MORGAN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 6:20 PM PDTSevere Thunderstorm WarningVEFClark40 min
Jul 17, 4:08 PM PDTSevere Thunderstorm WarningVEFLincoln52 min
Jul 17, 3:55 PM PDTSevere Thunderstorm WarningVEFMohave50 min
Jul 17, 4:58 PM PDTSevere Thunderstorm WarningVEFMohave62 min

Nearby

Flash Flood Watches in California, 2006Every flash flood watch in 2006

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.