Alert archive / Nevada / Flash Flood Warnings in 2012
Flash Flood Warning 120, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 17, 2012, 11:39 PM PDT for Clark County, Nevada. It was in force for 2 hr. 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 17, 2012, 11:39 PM PDT (06:39 UTC)
- Expired
- Aug 18, 2012, 1:45 AM PDT
- In force
- 2 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County Clark County, NV
The radar
The Las Vegas radar (KESX), 66 km from the middle of the area, began a volume at 06:41 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 18, 12:11 AM PDT | FLASH FLOOD | 4 W Las Vegas, NV | WATER AT LEAST SIX TO EIGHT INCHES DEEP WAS FLOWING THROUGH THE INTERSECTION OF WASHINGTON AND MICHAEL. |
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, 6.7 hours before the alert went out and 32 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
- 49 J/kg
- Mixed-layer CIN
- -111 J/kg
- Mixed-layer LCL
- 3156 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -38 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
915 WGUS55 KVEF 180639 FFWVEF NVC003-180845- /O.NEW.KVEF.FF.W.0120.120818T0639Z-120818T0845Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1139 PM PDT FRI AUG 17 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CLARK COUNTY IN SOUTHERN NEVADA... * UNTIL 145 AM PDT. * AT 1133 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR NORTH LAS VEGAS AIRPORT AND HIGHWAY 95 AND CHEYENNE BOULEVARD. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY. * LOCATIONS IMPACTED INCLUDE... CENTENNIAL HILLS...CHEYENNE AND 95 AND THE RAINBOW CURVE. 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. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER COVERING THE ROADWAY OR IN LOW WATER CROSSINGS. && LAT...LON 3628 11527 3628 11517 3616 11519 3616 11524 $$ JA
2 follow-up statements
120 WGUS75 KVEF 180724 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1224 AM PDT SAT AUG 18 2012 NVC003-180845- /O.CON.KVEF.FF.W.0120.000000T0000Z-120818T0845Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 1224 AM PDT SAT AUG 18 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM PDT FOR CENTRAL CLARK COUNTY... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT HEAVY RAINFALL IN THE NORTHWEST PART OF THE LAS VEGAS VALLEY BETWEEN THE RAINBOW CURVE AND CHEYENNE AVENUE WAS DECREASING AND MOVING TO THE WEST. THE HEAVIEST RAIN FELL BETWEEN DECATUR AND HIGHWAY 95. AUTOMATED GAUGES AND RADAR ESTIMATES INDICATE UP TO THREE-QUARTERS OF AN INCH OF RAIN FELL. FLOWING WATER BETWEEN 6 TO 8 INCHES DEEP WAS OBSERVED AT WASHINGTON AVENUE AND MICHAEL WAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER COVERING THE ROADWAY OR IN LOW WATER CROSSINGS. && LAT...LON 3624 11524 3626 11518 3616 11519 3616 11524 $$ JA
534 WGUS75 KVEF 180843 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 143 AM PDT SAT AUG 18 2012 NVC003-180846- /O.EXP.KVEF.FF.W.0120.000000T0000Z-120818T0845Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 143 AM PDT SAT AUG 18 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 145 AM PDT FOR CENTRAL CLARK COUNTY... RUNOFF HAS HAD TIME TO RECEDE IN THE NORTHWEST PART OF THE LAS VEGAS VALLEY BETWEEN NORTH LAS VEGAS AIRPORT AND HIGHWAY 95 WHERE HEAVY RAIN FELL BEFORE MIDNIGHT. SOME PONDING OF WATER MAY STILL REMAIN IN LOW LYING AREAS BUT SIGNIFICANT FLASH FLOODING HAS ENDED. LAT...LON 3624 11524 3626 11518 3616 11519 3616 11524 $$ JA
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 8:32 PM PDT | Flash Flood Warning | VEF | Clark, Lincoln | 4 hr |
| Aug 18, 12:01 PM PDT | Areal Flood Advisory | VEF | Clark | 119 min |
| Aug 18, 2:00 PM PDT | Areal Flood Advisory | VEF | Nye | 2 hr |
| Aug 18, 3:26 PM PDT | Areal Flood Advisory | VEF | Clark, Nye | 54 min |
| Aug 18, 3:39 PM PDT | Flash Flood Warning | VEF | Clark | 63 min |
| Aug 18, 4:18 PM PDT | Flash Flood Warning | VEF | Nye | 53 min |
| Aug 18, 4:24 PM PDT | Flash Flood Warning | VEF | Nye | 96 min |
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.