Alert archive / Nevada / Flash Flood Watches in 2013

Flash Flood Watch 5, NWS Las Vegas, NV

August 23, 2013Clark 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 23, 2013, 2:12 PM PDT for Clark County, Lincoln County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona. It took effect at Aug 25, 2013, 5:00 AM PDT. It was in force for 64 hr.

The area

The counties it named.

The facts

Issued
Aug 23, 2013, 2:12 PM PDT (21:12 UTC)
In effect from
Aug 25, 2013, 5:00 AM PDT
Expired
Aug 27, 2013, 9:00 PM PDT
In force
64 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 21:15 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, 9.2 hours before the alert went out and 15 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 2013-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 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 2013-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -76 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
54 J/kg
Mixed-layer CIN
-302 J/kg
Mixed-layer LCL
2064 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-76 m²/s²
0-3 km storm-relative helicity
-20 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 23, 8:54 AM PDT, 5 hours 18 minutes earlier.

Area forecast discussion, Aug 23, 8:54 AM PDT, 5 hours 18 minutes before
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Hazardous weather outlook, Aug 23, 5:51 AM PDT, 8 hours 21 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
551 AM PDT FRI AUG 23 2013

AZZ001>003-036-CAZ522>527-NVZ015>022-240700-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-DEATH VALLEY NATIONAL PARK-
WESTERN MOJAVE DESERT-EASTERN MOJAVE DESERT-MORONGO BASIN-
CADIZ BASIN-SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-
LINCOLN COUNTY-NORTHEAST CLARK COUNTY-
WESTERN CLARK AND SOUTHERN NYE COUNTY-SHEEP RANGE-
SPRING MOUNTAINS-LAS VEGAS VALLEY-SOUTHERN CLARK COUNTY-
551 AM PDT FRI AUG 23 2013 /551 AM MST FRI AUG 23 2013/

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS CAN BE EXPECTED OVER MOHAVE COUNTY THIS
AFTERNOON AND EVENING WITH MORE ISOLATED COVERAGE OVER CLARK AND
EASTERN SAN BERNARDINO COUNTIES. LOCALIZED HEAVY RAIN AND ASSOCIATED
FLASH FLOODING WILL BE POSSIBLE...ESPECIALLY NEAR HIGHER TERRAIN.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED TO SCATTERED THUNDERSTORMS CAN BE EXPECTED OVER A SIMILAR
AREA SATURDAY WITH THE POTENTIAL FOR LOCALIZED HEAVY RAIN AND FLASH
FLOODING. A TROPICAL SYSTEM MOVING UP THE WEST COAST OF SOUTHERN BAJA
WILL LIKELY INDUCE A SIGNIFICANT INCREASE IN MOISTURE BY SUNDAY.
THIS WILL LEAD TO NUMEROUS SHOWERS AND THUNDERSTORMS...SOME WITH
HEAVY RAIN. THIS WILL INCREASE THE POTENTIAL FOR FLASH FLOODING
SUNDAY INTO MONDAY...MAINLY ACROSS CLARK...MOHAVE AND SAN BERNARDINO
COUNTIES. ONCE IN PLACE...MOISTURE WILL LINGER TUESDAY THROUGH
THURSDAY FOR A CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS EACH
DAY WITH LOCALIZED HEAVY RAIN AND FLASH FLOODING POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED SUNDAY AND POSSIBLY MONDAY IN
CLARK...MOHAVE AND EASTERN SAN BERNARDINO COUNTIES. MEANWHILE...
SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS
ACCORDING TO STANDARD OPERATING PROCEDURES.

CAZ519>521-NVZ014-240700-
EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
ESMERALDA AND CENTRAL NYE COUNTY-
551 AM PDT FRI AUG 23 2013

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

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

JA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 3:10 PM PDTFlash Flood WarningVEFClark2 hr
Aug 23, 3:34 PM PDTSevere Thunderstorm WarningVEFClark41 min
Aug 23, 4:18 PM PDTSevere Thunderstorm WarningVEFClark42 min
Aug 23, 4:21 PM PDTFlash Flood WarningVEFClark114 min
Aug 22, 7:04 PM PDTAreal Flood AdvisoryVEFSan Bernardino2 hr
Aug 22, 9:32 PM PDTFlash Flood WarningVEFSan Bernardino118 min
Aug 23, 12:08 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 23, 12:45 AM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr
Aug 23, 4:00 PM PDTSevere Thunderstorm WarningVEFSan Bernardino45 min
Aug 23, 4:40 PM PDTAreal Flood AdvisoryVEFSan Bernardino95 min
Aug 23, 12:50 AM PDTFlash Flood WarningVEFMohave115 min
Aug 23, 1:31 AM PDTAreal Flood AdvisoryVEFMohave89 min

Nearby

Flash Flood Watches in Nevada, 2013Flash Flood Watches in California, 2013Flash Flood Watches in Arizona, 2013Every flash flood watch in 2013

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.