Alert archive / Nevada / Flash Flood Watches in 2012
Flash Flood Watch 2, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood watch at Jul 15, 2012, 10:14 AM PDT for San Bernardino County, California; Clark County, Lincoln County, Nye County, Nevada; Mohave County, Arizona. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Jul 15, 2012, 10:14 AM PDT (17:14 UTC)
- Expired
- Jul 15, 2012, 9:00 PM PDT
- In force
- 11 hr
- Issued by
- NWS Las Vegas, NV
- Flood severity
- None
Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV, Lincoln County, NV, Nye County, NV
The radar
The Las Vegas radar (KESX), 94 km from the middle of the area, began a volume at 17:15 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, 5.2 hours before the alert went out and 28 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.
- Mixed-layer CAPE
- 335 J/kg
- Mixed-layer CIN
- -212 J/kg
- Mixed-layer LCL
- 1353 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
230 WGUS65 KVEF 151714 FFAVEF URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE LAS VEGAS NV 1014 AM PDT SUN JUL 15 2012 .CONDITIONS REMAIN FAVORABLE FOR NUMEROUS HEAVY RAIN PRODUCING THUNDERSTORMS TO DEVELOP OVER FAR SOUTHERN NEVADA...EASTERN SAN BERNARDINO COUNTY CALIFORNIA AND NORTHWEST ARIZONA THROUGH THIS EVENING. AZZ001>003-036-CAZ524>527-NVZ016-018>022-152330- /O.NEW.KVEF.FF.A.0002.120715T1714Z-120716T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHWEST PLATEAU-LAKE HAVASU AND FORT MOHAVE-NORTHWEST DESERTS- LAKE MEAD NATIONAL RECREATION AREA-EASTERN MOJAVE DESERT- MORONGO BASIN-CADIZ BASIN-SAN BERNARDINO COUNTY- UPPER COLORADO RIVER VALLEY-NORTHEAST CLARK COUNTY-SHEEP RANGE- SPRING MOUNTAINS-RED ROCK CANYON-LAS VEGAS VALLEY- SOUTHERN CLARK COUNTY- 1014 AM PDT SUN JUL 15 2012 /1014 AM MST SUN JUL 15 2012/ ...FLASH FLOOD WATCH IN EFFECT UNTIL 9 PM PDT /9 PM MST/ THIS EVENING... THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHWEST ARIZONA... CALIFORNIA AND SOUTHERN NEVADA...INCLUDING THE FOLLOWING AREAS...IN NORTHWEST ARIZONA...LAKE HAVASU AND FORT MOHAVE... LAKE MEAD NATIONAL RECREATION AREA...NORTHWEST DESERTS AND NORTHWEST PLATEAU. IN CALIFORNIA...CADIZ BASIN...EASTERN MOJAVE DESERT...MORONGO BASIN AND SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY. IN SOUTHERN NEVADA...LAKE MEAD NATIONAL RECREATION AREA...LAS VEGAS VALLEY...NORTHEAST CLARK COUNTY... SHEEP RANGE...SOUTHERN CLARK COUNTY AND SPRING MOUNTAINS-RED ROCK CANYON. * UNTIL 9 PM PDT /9 PM MST/ THIS EVENING * A DEEP MOIST AND UNSTABLE AIR MASS WILL REMAIN IN PLACE OVER THE WATCH AREA TODAY WHILE A LOW PRESSURE SYSTEM CIRCULATES ALONG THE CENTRAL CALIFORNIA COAST. DISTURBANCES EJECTING OUT OF THE SYSTEM WILL LIKELY AID THE DEVELOPMENT OF HEAVY RAIN PRODUCING THUNDERSTORMS THIS AFTERNOON AND EVENING. BETWEEN ONE AND TWO INCHES OF RAINFALL CAN BE EXPECTED WITH THE STRONGEST STORMS. * TRAVELERS SHOULD BE ALERT FOR THE POTENTIAL FOR WATER TO COVER LOW SPOTS INCLUDING ANY ROADS THAT RUN THROUGH WASHES. ROCKS AND MUD MAY WASH ONTO ROADS DUE TO RUNOFF. DIRT AND GRAVEL SECONDARY ROADS MAY WASH OUT OR BE IMPASSIBLE. STORM DRAINS AND FLOOD CONTROL CHANNELS COULD SEE RAPIDLY FLOWING WATER IN THEM ALONG WITH THE POTENTIAL FOR DEBRIS TO COLLECT IN THEM. IN ADDITION... RUNOFF MAY CAUSE FLOODING WELL DOWNSTREAM FROM WHERE ANY RAIN FALLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION AND PERSONS IN AND NEAR THE WATCH AREA SHOULD BE ALERT TO THE POTENTIAL FOR HEAVY RAINFALL. && $$
2 follow-up statements
922 WGUS65 KVEF 152312 FFAVEF FLOOD WATCH NATIONAL WEATHER SERVICE LAS VEGAS NV 412 PM PDT SUN JUL 15 2012 .CONDITIONS REMAIN FAVORABLE FOR NUMEROUS HEAVY RAIN PRODUCING THUNDERSTORMS TO DEVELOP OVER FAR SOUTHERN NEVADA...EASTERN SAN BERNARDINO COUNTY CALIFORNIA AND NORTHWEST ARIZONA THROUGH THIS EVENING. AZZ001>003-036-CAZ524>527-NVZ016-018>022-160400- /O.CON.KVEF.FF.A.0002.000000T0000Z-120716T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHWEST PLATEAU-LAKE HAVASU AND FORT MOHAVE-NORTHWEST DESERTS- LAKE MEAD NATIONAL RECREATION AREA-EASTERN MOJAVE DESERT- MORONGO BASIN-CADIZ BASIN-SAN BERNARDINO COUNTY- UPPER COLORADO RIVER VALLEY-NORTHEAST CLARK COUNTY-SHEEP RANGE- SPRING MOUNTAINS-RED ROCK CANYON-LAS VEGAS VALLEY- SOUTHERN CLARK COUNTY- 412 PM PDT SUN JUL 15 2012 /412 PM MST SUN JUL 15 2012/ ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM PDT /9 PM MST/ THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHWEST ARIZONA...CALIFORNIA AND SOUTHERN NEVADA...INCLUDING THE FOLLOWING AREAS...IN NORTHWEST ARIZONA...LAKE HAVASU AND FORT MOHAVE...LAKE MEAD NATIONAL RECREATION AREA...NORTHWEST DESERTS AND NORTHWEST PLATEAU. IN CALIFORNIA...CADIZ BASIN...EASTERN MOJAVE DESERT...MORONGO BASIN AND SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY. IN SOUTHERN NEVADA...LAKE MEAD NATIONAL RECREATION AREA...LAS VEGAS VALLEY...NORTHEAST CLARK COUNTY...SHEEP RANGE...SOUTHERN CLARK COUNTY AND SPRING MOUNTAINS-RED ROCK CANYON. * UNTIL 9 PM PDT /9 PM MST/ THIS EVENING * A DEEP MOIST AND UNSTABLE AIR MASS WILL REMAIN OVER THE WATCH AREA WHILE A LOW PRESSURE SYSTEM CIRCULATES ALONG THE CENTRAL CALIFORNIA COAST. DISTURBANCES EJECTING OUT OF THE SYSTEM WILL LIKELY AID THE DEVELOPMENT OF HEAVY RAIN PRODUCING THUNDERSTORMS THROUGH THIS EVENING. BETWEEN ONE AND TWO INCHES OF RAINFALL CAN BE EXPECTED WITH THE STRONGEST STORMS. * TRAVELERS SHOULD BE ALERT FOR THE POTENTIAL FOR WATER TO COVER LOW SPOTS INCLUDING ANY ROADS THAT RUN THROUGH WASHES. ROCKS AND MUD MAY WASH ONTO ROADS DUE TO RUNOFF. DIRT AND GRAVEL SECONDARY ROADS MAY WASH OUT OR BE IMPASSIBLE. STORM DRAINS AND FLOOD CONTROL CHANNELS COULD SEE RAPIDLY FLOWING WATER IN THEM ALONG WITH THE POTENTIAL FOR DEBRIS TO COLLECT IN THEM. IN ADDITION... RUNOFF MAY CAUSE FLOODING WELL DOWNSTREAM FROM WHERE ANY RAIN FALLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION AND PERSONS IN AND NEAR THE WATCH AREA SHOULD BE ALERT TO THE POTENTIAL FOR HEAVY RAINFALL. && $$ JA
507 WGUS65 KVEF 160340 FFAVEF FLOOD WATCH NATIONAL WEATHER SERVICE LAS VEGAS NV 840 PM PDT SUN JUL 15 2012 AZZ001>003-036-CAZ524>527-NVZ016-018>022-160445- /O.EXP.KVEF.FF.A.0002.000000T0000Z-120716T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHWEST PLATEAU-LAKE HAVASU AND FORT MOHAVE-NORTHWEST DESERTS- LAKE MEAD NATIONAL RECREATION AREA-EASTERN MOJAVE DESERT- MORONGO BASIN-CADIZ BASIN-SAN BERNARDINO COUNTY- UPPER COLORADO RIVER VALLEY-NORTHEAST CLARK COUNTY-SHEEP RANGE- SPRING MOUNTAINS-RED ROCK CANYON-LAS VEGAS VALLEY- SOUTHERN CLARK COUNTY- 840 PM PDT SUN JUL 15 2012 /840 PM MST SUN JUL 15 2012/ ...FLASH FLOOD WATCH WILL EXPIRE AT 9 PM PDT /9 PM MST/ THIS EVENING... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHWEST ARIZONA... CALIFORNIA AND SOUTHERN NEVADA WILL EXPIRE AT 9 PM PDT /9 PM MST/ THIS EVENING. THUNDERSTORM ACTIVITY HAS DECREASED SIGNIFICANTLY THIS EVENING. ISOLATED THUNDERSTORMS ARE STILL POSSIBLE TONIGHT BUT THE THREAT OF WIDESPREAD FLASH FLOODING HAS ENDED. $$
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 7:25 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 14, 8:50 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 27 min |
| Jul 14, 9:16 PM PDT | Flash Flood Warning | VEF | San Bernardino | 119 min |
| Jul 14, 11:35 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Jul 15, 12:29 AM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 15, 11:52 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 15, 11:59 AM PDT | Flash Flood Warning | VEF | Inyo | 2 hr |
| Jul 15, 2:20 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 115 min |
| Jul 15, 3:07 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 38 min |
| Jul 15, 4:52 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 38 min |
| Jul 14, 6:02 PM PDT | Areal Flood Advisory | VEF | Clark | 116 min |
| Jul 14, 8:41 PM PDT | Areal Flood Advisory | VEF | Clark | 16 min |
| Jul 14, 8:56 PM PDT | Flash Flood Warning | VEF | Clark | 109 min |
| Jul 15, 10:30 AM PDT | Flash Flood Warning | VEF | Lincoln | 4 hr |
| Jul 15, 1:12 PM PDT | Flash Flood Warning | VEF | Clark | 2 hr |
| Jul 15, 1:24 PM PDT | Flash Flood Warning | VEF | Nye | 4 hr |
| Jul 15, 1:58 PM PDT | Flash Flood Warning | VEF | Lincoln | 82 min |
| Jul 15, 2:16 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 44 min |
| Jul 15, 2:41 PM PDT | Areal Flood Advisory | VEF | Clark | 3 hr |
| Jul 15, 3:01 PM PDT | Flash Flood Warning | VEF | Lincoln | 6 hr |
| Jul 15, 4:40 PM PDT | Flash Flood Warning | VEF | Clark | 65 min |
| Jul 15, 4:58 PM PDT | Flash Flood Warning | VEF | Clark | 92 min |
| Jul 14, 5:10 PM PDT | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 14, 5:30 PM PDT | Flash Flood Warning | VEF | Mohave | 2 hr |
| Jul 14, 6:36 PM PDT | Flash Flood Warning | VEF | Mohave | 114 min |
| Jul 14, 8:20 PM PDT | Flash Flood Warning | VEF | Mohave | 115 min |
| Jul 14, 10:01 PM PDT | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 15, 12:53 PM PDT | Flash Flood Warning | VEF | Mohave | 2 hr |
Nearby
Flash Flood Watches in Nevada, 2012Flash Flood Watches in California, 2012Flash Flood Watches in Arizona, 2012Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.