Alert archive / Nevada / Flash Flood Warnings in 2012
Flash Flood Warning 158, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 22, 2012, 12:33 PM PDT for Clark County, Nevada. It was in force for 117 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2012, 12:33 PM PDT (19:33 UTC)
- Expired
- Aug 22, 2012, 2:30 PM PDT
- In force
- 117 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), 27 km from the middle of the area, began a volume at 19:37 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, 7.6 hours before the alert went out and 116 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.
039 WGUS55 KVEF 221933 FFWVEF NVC003-222130- /O.NEW.KVEF.FF.W.0158.120822T1933Z-120822T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1233 PM PDT WED AUG 22 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL CLARK COUNTY IN SOUTHERN NEVADA... * UNTIL 230 PM PDT. * AT 1224 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES WEST OF SEARCHLIGHT TO CAL NEV ARI...OR ALONG A LINE EXTENDING FROM 9 MILES WEST OF SEARCHLIGHT TO 14 MILES SOUTH OF SEARCHLIGHT. THE STORMS PRODUCING VERY HEAVY RAIN WERE MOVING NORTHEAST AROUND 20 MPH. * LOCATIONS IMPACTED INCLUDE... SEARCHLIGHT AND CAL NEV ARI. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. 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 3566 11501 3529 11465 3517 11483 3551 11518 $$ ASG
2 follow-up statements
670 WGUS75 KVEF 222034 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 134 PM PDT WED AUG 22 2012 NVC003-222130- /O.CON.KVEF.FF.W.0158.000000T0000Z-120822T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 134 PM PDT WED AUG 22 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM PDT FOR SOUTH CENTRAL CLARK COUNTY... AT 129 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE VERY HEAVY RAIN BETWEEN SEARCHLIGHT AND CAL NEV ARI. THESE STORMS WERE MOVING NORTHEAST AT 20 MPH. LOCATIONS IMPACTED INCLUDE... SEARCHLIGHT AND CAL NEV ARI. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3566 11501 3529 11465 3517 11483 3551 11518 $$ ASG
404 WGUS75 KVEF 222123 RRA FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 223 PM PDT WED AUG 22 2012 NVC003-222132- /O.EXP.KVEF.FF.W.0158.000000T0000Z-120822T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 223 PM PDT WED AUG 22 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 230 PM PDT FOR SOUTH CENTRAL CLARK COUNTY... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND MOVED NORTHEAST. LIGHT TO MODERATE RAIN IS STILL EXPECTED OVER THE NEXT HOUR...BUT THE THREAT OF ADDITIONAL FLOODING HAS ENDED. LAT...LON 3566 11501 3529 11465 3517 11483 3551 11518 $$ ASG
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, 9:20 AM PDT | Flash Flood Warning | VEF | Clark | 101 min |
| 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.