Alert archive / Nevada / Flash Flood Warnings in 2012
Flash Flood Warning 220, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Oct 11, 2012, 7:56 PM PDT for Clark County, Nevada. It was in force for 80 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
- Oct 11, 2012, 7:56 PM PDT (02:56 UTC)
- Expired
- Oct 11, 2012, 9:16 PM PDT
- In force
- 80 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), 49 km from the middle of the area, began a volume at 02:58 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 |
|---|---|---|---|
| Oct 11, 8:50 PM PDT | FLASH FLOOD | 4 Wnw Silverado Ranch, NV | AT LEAST 6 INCHES OF FLOWING WATER WAS CROSSING THE SOUTHBOUND LANE OF DEAN MARTIN 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 00:00Z, 2.9 hours before the alert went out and 46 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
- 305 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 1141 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
593 WGUS55 KVEF 120256 FFWVEF NVC003-120500- /O.NEW.KVEF.FF.W.0220.121012T0256Z-121012T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 756 PM PDT THU OCT 11 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CLARK COUNTY IN SOUTHERN NEVADA... * UNTIL 1000 PM PDT. * AT 750 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS MOVING NORTHWEST AT 10 TO 15 MPH ACROSS THE SOUTHWEST AND SOUTH END OF THE LAS VEGAS VALLEY. VERY HEAVY RAIN WAS FALLING WITH THIS AREA OF THUNDERSTORMS WITH LOCALIZED AMOUNTS LIKELY TO EXCEED A HALF AN INCH AN HOUR. POOR DRAINAGE AREAS AND LOW LYING SECTIONS WILL SEE SEVERAL INCHES OF WATER FLOWING THROUGH THEM AS WELL AS THE POTENTIAL FOR MUD AND ROCKS TO ACCOMPANY THE WATER. BE CAREFUL AT NIGHT AS IT IS HARDER TO SEE FLOODWATERS. WASHES WILL SEE RAPID FLOWS IN THEM. * LOCATIONS IMPACTED INCLUDE... HENDERSON EXECUTIVE...ANTHEM...SLOAN...SEVEN HILLS...SOUTHERN HIGHLANDS...SILVERADO RANCH...GREEN VALLEY...MOUNTAINS EDGE... MCCARRAN INTERNATIONAL AIRPORT 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 3616 11537 3607 11507 3585 11499 3597 11537 $$ STACHELSKI
1 follow-up statement
320 WGUS75 KVEF 120416 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 916 PM PDT THU OCT 11 2012 NVC003-120420- /O.CAN.KVEF.FF.W.0220.000000T0000Z-121012T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 916 PM PDT THU OCT 11 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL CLARK COUNTY... THE HEAVY RAIN HAS ENDED ACROSS THE SOUTHERN AND SOUTHWEST PORTION OF THE LAS VEGAS VALLEY. RUNOFF WILL CONTINUE TO PRODUCE MINOR FLOODING...BUT THE MOST SIGNIFICANT FLOODING HAS ENDED AND THE FLASH FLOOD WARNING HAS BEEN CANCELLED. ADDITIONAL FLASH FLOOD WARNINGS STILL REMAIN IN EFFECT IN CENTRAL CLARK COUNTY FURTHER TO THE NORTH INCLUDING LOCATIONS OF NORTH LAS VEGAS... NELLIS AFB...AND ALIANTE. LAT...LON 3616 11537 3607 11507 3585 11499 3597 11537 $$ CZYZYK
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 11, 5:25 PM PDT | Severe Thunderstorm Warning | VEF | Clark, Nye | 35 min |
| Oct 11, 5:52 PM PDT | Severe Thunderstorm Warning | VEF | Nye | 53 min |
| Oct 11, 6:45 PM PDT | Flash Flood Warning | VEF | Clark | 2 hr |
| Oct 11, 8:12 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 48 min |
| Oct 11, 8:21 PM PDT | Flash Flood Warning | VEF | Clark | 114 min |
| Oct 11, 8:57 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 48 min |
| Oct 11, 9:07 PM PDT | Flash Flood Warning | VEF | Clark | 113 min |
| Oct 11, 9:40 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 27 min |
| Oct 11, 10:15 PM PDT | Flash Flood Warning | VEF | Clark | 2 hr |
| Oct 11, 10:42 PM PDT | Flash Flood Warning | VEF | Clark | 94 min |
| Oct 12, 12:03 AM PDT | Flash Flood Warning | VEF | Nye | 87 min |
| Oct 12, 12:28 AM PDT | Severe Thunderstorm Warning | VEF | Lincoln | 32 min |
| Oct 12, 1:43 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.