Alert archive / Nevada / Flash Flood Warnings in 2012
Flash Flood Warning 146, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 22, 2012, 9:20 AM PDT for Clark County, Nevada. It was in force for 101 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 22, 2012, 9:20 AM PDT (16:20 UTC)
- Expired
- Aug 22, 2012, 11:01 AM PDT
- In force
- 101 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County Clark County, NV
The radar
The Las Vegas radar (KESX), 53 km from the middle of the area, began a volume at 16:22 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 22, 10:45 AM PDT | FLASH FLOOD | 4 Ssw Spring Valley, NV | 4 INCHES OF WATER WITH MUD AND ROCKS FLOWING ACROSS WARM SPRINGS ROAD JUST WEST OF BUFFALO DRIVE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 4.3 hours before the alert went out and 42 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
- 296 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1290 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.4
The text
As transmitted, in the capitals the NWS used until 2016.
400 WGUS55 KVEF 221620 FFWVEF NVC003-221815- /O.NEW.KVEF.FF.W.0146.120822T1620Z-120822T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 920 AM PDT WED AUG 22 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CLARK COUNTY IN SOUTHERN NEVADA... * UNTIL 1115 AM PDT. * AT 914 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FROM A CLUSTER OF THUNDERSTORMS MOVING OVER THE SOUTHWEST LAS VEGAS...WITH RAINFALL RATES CAPABLE OF PRODUCING FLASH FLOODING. THESE STORMS WERE MOVING TO THE NORTHEAST AT 15 MPH...HOWEVER ADDITIONAL STORMS REDEVELOPING SOUTHWEST OF THE REGION ARE EXPECTED TO CONTINUE TO RESULT IN MODERATE TO HEAVY RAIN ACROSS THE AREA. * LOCATIONS IMPACTED INCLUDE...SOUTHWEST LAS VEGAS...INCLUDING THE COMMUNITIES OF MOUNTAINS EDGE...RHODES RANCH...AND SPRING VALLEY. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. 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 BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3611 11530 3611 11520 3601 11519 3601 11530 $$ KENNEDY
2 follow-up statements
317 WGUS75 KVEF 221721 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1021 AM PDT WED AUG 22 2012 NVC003-221815- /O.CON.KVEF.FF.W.0146.000000T0000Z-120822T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 1021 AM PDT WED AUG 22 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 AM PDT FOR CENTRAL CLARK COUNTY... AT 1010 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THUNDERSTORMS MOVING OVER THE SOUTHWEST LAS VEGAS VALLEY WITH RAIN RATES CAPABLE OF PRODUCING FLASH FLOODING. OVER THE PAST HOUR...BETWEEN 0.50 AND 1 INCH OF RAIN HAS FALLEN ACROSS THIS QUADRANT OF THE VALLEY BASED ON SURFACE OBSERVATIONS...AND SIGNIFICANT ADDITIONAL ACCUMULATIONS LOOK LIKELY. LOCATIONS IMPACTED INCLUDE... PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3611 11530 3611 11520 3601 11519 3601 11530 $$ KENNEDY
529 WGUS75 KVEF 221801 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1101 AM PDT WED AUG 22 2012 NVC003-221810- /O.CAN.KVEF.FF.W.0146.000000T0000Z-120822T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 1101 AM PDT WED AUG 22 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL CLARK COUNTY... THE FLASH FLOOD WARNING FOR SOUTHWEST LAS VEGAS ISSUED EARLIER THIS MORNING HAS BEEN CANCELLED AND REPLACED BY A NEW FLASH FLOOD WARNING THAT INCLUDES THE ENTIRE LAS VEGAS VALLEY...THAT IS VALID UNTIL 145 PM PDT. YOU MAY REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...NWSVEGAS. LAT...LON 3611 11530 3611 11520 3601 11519 3601 11530 $$ KENNEDY
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 6:10 PM PDT | Flash Flood Warning | VEF | Clark, Lincoln | 2 hr |
| Aug 21, 6:47 PM PDT | Flash Flood Warning | VEF | Lincoln | 118 min |
| Aug 22, 12:12 AM PDT | Flash Flood Warning | VEF | Clark | 2 hr |
| Aug 22, 2:35 AM PDT | Flash Flood Warning | VEF | Clark | 115 min |
| Aug 22, 8:22 AM PDT | Areal Flood Advisory | VEF | Clark | 9 hr |
| Aug 22, 9:19 AM PDT | Areal Flood Advisory | VEF | Clark, Lincoln, Nye | 3 hr |
| Aug 22, 9:34 AM PDT | Flash Flood Warning | VEF | Clark | 116 min |
| Aug 22, 9:59 AM PDT | Flash Flood Warning | VEF | Clark | 59 min |
| Aug 22, 10:05 AM PDT | Flash Flood Warning | VEF | Esmeralda | 76 min |
| Aug 22, 10:53 AM PDT | Flash Flood Warning | VEF | Clark | 4 hr |
| Aug 22, 12:12 PM PDT | Flash Flood Warning | VEF | Clark | 4 hr |
| Aug 22, 12:33 PM PDT | Flash Flood Warning | VEF | Clark | 117 min |
| Aug 22, 2:40 PM PDT | Areal Flood Advisory | VEF | Clark | 6 hr |
| Aug 22, 3:43 PM PDT | Flash Flood Warning | VEF | Clark | 2 hr |
Nearby
Flash Flood Warnings in Nevada, 2012Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.