Alert archive / Nevada / Flash Flood Warnings in 2012
Flash Flood Warning 84, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 4:37 PM PDT for Clark County, Nevada. It was in force for 113 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
- Jul 31, 2012, 4:37 PM PDT (23:37 UTC)
- Expired
- Jul 31, 2012, 6:30 PM PDT
- In force
- 113 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), 37 km from the middle of the area, began a volume at 23:40 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 |
|---|---|---|---|
| Jul 31, 5:10 PM PDT | FLASH FLOOD | 5 Ese Henderson, NV | LAS VEGAS BROADCAST MEDIA REPORTED AT LEAST 6 INCHES OF MUDDY FLOWING WATER AT THE INTERSECTION WAGON WHEEL AND BOULDER HIGHWAY. |
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, 11.6 hours before the alert went out and 63 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
- 121 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1334 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- -43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
718 WGUS55 KVEF 312337 FFWVEF NVC003-010130- /O.NEW.KVEF.FF.W.0084.120731T2337Z-120801T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 437 PM PDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CLARK COUNTY IN SOUTHERN NEVADA... * UNTIL 630 PM PDT. * AT 432 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR RAILROAD PASS...OR NEAR BOULDER CITY...MOVING NORTHWEST AT 5 MPH. * LOCATIONS IMPACTED INCLUDE... HENDERSON AND GREEN 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 3604 11511 3616 11491 3599 11485 3591 11496 $$ JA
3 follow-up statements
848 WGUS75 KVEF 312358 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 458 PM PDT TUE JUL 31 2012 NVC003-010130- /O.CON.KVEF.FF.W.0084.000000T0000Z-120801T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 458 PM PDT TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR CENTRAL CLARK COUNTY... DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING HEAVY RAIN OVER HENDERSON. THIS STORM WAS MOVING TO THE NORTHWEST AT 5 MPH. AUTOMATED SENSORS IN HENDERSON REPORTED BETWEEN THREE-QUARTERS OF AN INCH AND 1.3 INCHES OF RAIN HAVE FALLEN IN THIRTY MINUTES. LOCATIONS IMPACTED INCLUDE... HENDERSON...GREEN VALLEY...RAILROAD PASS AND AREAS AROUND SAM BOYD STADIUM. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3604 11511 3616 11491 3599 11485 3591 11496 $$ JA
918 WGUS75 KVEF 010023 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 523 PM PDT TUE JUL 31 2012 NVC003-010130- /O.CON.KVEF.FF.W.0084.000000T0000Z-120801T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 523 PM PDT TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR CENTRAL CLARK COUNTY... AT 515 PM PDT...FLASH FLOODING WAS REPORTED NEAR WAGON WHEEL DRIVE AND BOULDER HIGHWAY IN HENDERSON. THE THUNDERSTORM WAS WEAKENING AND ONLY LIGHT TO MODERATE RAIN SHOWERS WERE OCCURRING. AUTOMATED RAIN GAUGES AROUND WAGON WHEEL AND BOULDER HIGHWAY REPORTED RAINFALL AMOUNTS BETWEEN .75 OF AN INCH AND 1.3 INCHES SINCE 520 PM. LOCATIONS IMPACTED INCLUDE... HENDERSON FROM WAGON WHEEL DRIVE TO SAM BOYD STADIUM. 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 3594 11492 3607 11505 3616 11491 3599 11485 $$ JA
425 WGUS75 KVEF 010126 RRA FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 626 PM PDT TUE JUL 31 2012 NVC003-010131- /O.EXP.KVEF.FF.W.0084.000000T0000Z-120801T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 626 PM PDT TUE JUL 31 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM PDT FOR CENTRAL CLARK COUNTY... NO ADDITIONAL RAIN HAS FALLEN OVER HENDERSON SINCE 530 PM. EVEN THOUGH THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE ON SCHEDULE...RUNOFF WILL STILL BE RECEDING IN FLOOD CHANNELS AND ON SOME STREETS AND INTERSECTIONS THROUGH EARLY EVENING. LAT...LON 3594 11492 3607 11505 3616 11491 3599 11485 $$ JA
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 2:29 AM PDT | Flash Flood Watch | VEF | Clark | 19 hr |
| Jul 31, 6:39 AM PDT | Areal Flood Advisory | VEF | Clark | 51 min |
| Jul 31, 2:33 PM PDT | Flash Flood Warning | VEF | Clark, Nye | 117 min |
| Jul 31, 2:42 PM PDT | Flash Flood Warning | VEF | Clark | 3 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.