Alert archive / Nevada / Flash Flood Watches in 2008

Flash Flood Watch 7, NWS Las Vegas, NV

August 5, 2008Clark County, Lincoln County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood watch at Aug 5, 2008, 10:19 AM PDT for Clark County, Lincoln County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona. It took effect at Aug 5, 2008, 11:00 AM PDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued
Aug 5, 2008, 10:19 AM PDT (17:19 UTC)
In effect from
Aug 5, 2008, 11:00 AM PDT
Expired
Aug 5, 2008, 9:46 PM PDT
In force
11 hr
Issued by
NWS Las Vegas, NV
Flood severity
None

Counties Mohave County, AZ, Inyo County, CA, San Bernardino County, CA, Clark County, NV, Lincoln County, NV, Nye County, NV

The radar

The Las Vegas radar (KESX), 110 km from the middle of the area, began a volume at 17:18 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

Mercury/Desert R, NV (KDRA), launched 12:00Z, 5.3 hours before the alert went out and 37 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 2008-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 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 2008-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 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
33 J/kg
Mixed-layer CIN
-264 J/kg
Mixed-layer LCL
2312 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
-15 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 Aug 5, 10:10 AM PDT, 9 minutes earlier.

Area forecast discussion, Aug 5, 10:10 AM PDT, 9 minutes before
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Hazardous weather outlook, Aug 5, 6:29 AM PDT, 3 hours 50 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
629 AM PDT TUE AUG 5 2008

AZZ001>003-036-CAZ519>527-NVZ014>022-060700-
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-
629 AM PDT TUE AUG 5 2008 /629 AM MST TUE AUG 5 2008/

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL DEVELOP ACROSS SOUTHEAST NEVADA...
NORTHWEST ARIZONA AND EASTERN SAN BERNARDINO COUNTY CALIFORNIA
THIS AFTERNOON AND EVENING. HEAVY RAIN WILL BE POSSIBLE AND ISOLATED
FLASH FLOODING WILL BE THE MAIN HAZARDOUS WEATHER THREAT IN THESE
AREAS...THOUGH STRONG WIND GUSTS AND HAIL WILL ALSO BE POSSIBLE
WITH A FEW STORMS. ISOLATED THUNDERSTORMS ARE EXPECTED OVER INYO
COUNTY CALIFORNIA AND ADJOINING AREAS OF SOUTHWEST NEVADA.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A MOIST AND UNSTABLE AIR MASS WILL REMAIN IN PLACE WEDNESDAY AND
THURSDAY FOR CONTINUED THUNDERSTORMS MAINLY DURING THE AFTERNOON
AND EVENING HOURS. ISOLATED FLASH FLOODING WILL CONTINUE TO BE THE
MAIN HAZARDOUS WEATHER THREAT. DRIER SOUTHWEST FLOW IS FORECAST
TO DEVELOP OVER SOUTHEAST CALIFORNIA AND SOUTHERN NEVADA FOR THE
WEEKEND AND EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

ADAIR

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 7:45 PM PDTAreal Flood AdvisoryVEFClark2 hr
Aug 5, 1:44 PM PDTAreal Flood AdvisoryVEFClark, Nye3 hr
Aug 5, 1:59 PM PDTAreal Flood AdvisoryVEFClark, Lincoln, Nye2 hr
Aug 5, 2:25 PM PDTAreal Flood AdvisoryVEFClark110 min
Aug 5, 3:40 PM PDTAreal Flood AdvisoryVEFLincoln3 hr
Aug 5, 4:48 PM PDTSevere Thunderstorm WarningVEFClark42 min
Aug 5, 4:16 PM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr
Aug 4, 5:35 PM PDTAreal Flood AdvisoryVEFMohave115 min
Aug 4, 5:47 PM PDTFlash Flood WarningVEFMohave117 min
Aug 5, 2:08 PM PDTAreal Flood AdvisoryVEF88 min

Nearby

Flash Flood Watches in Nevada, 2008Flash Flood Watches in California, 2008Flash Flood Watches in Arizona, 2008Every flash flood watch in 2008

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.