Alert archive / Nevada / Flash Flood Warnings in 2012
Flash Flood Warning 201, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 11, 2012, 1:51 PM PDT for Clark County, Nevada. It was in force for 114 min. 6 reports 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
- Sep 11, 2012, 1:51 PM PDT (20:51 UTC)
- Expired
- Sep 11, 2012, 3:45 PM PDT
- In force
- 114 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), 38 km from the middle of the area, began a volume at 20:52 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 |
|---|---|---|---|
| Sep 11, 2:00 PM PDT | FLASH FLOOD | 4 W Green Valley, NV | NEVADA HIGHWAY PATROL CLOSED 215 FROM I-15 TO WARM SPRINGS. THE AIRPORT CONNECTOR WAS CLOSED DUE TO A LARGE AMOUNT OF MUD AND ROCKS THAT WASHED DOWN THE SIDES OF THE ROAD FROM LANDSCAPED AREAS. |
| Sep 11, 2:12 PM PDT | FLASH FLOOD | 3 Sse Henderson, NV | SPOTTER REPORTED WATER FLOWING 6 INCHES DEEP AT THE INTERSECTION OF GREENWAY AND TRENIER. TRAFFIC CONTROL CONES AND BARRICADES WERE FLOATING IN THE WATER. |
| Sep 11, 2:33 PM PDT | FLASH FLOOD | 3 Sse Green Valley, NV | NWS EMPLOYEE REPORTS LARGE AMOUNT OF WATER MOVING ACROSS ARROYO GRANDE BETWEEN HORIZON RIDGE PARKWAY AND 215. WATER ALSO FLOWING ACROSS HORIZON RIDGE NEAR THE POST OFFICE. |
| Sep 11, 2:33 PM PDT | HEAVY RAIN 0.5 | 2 Ese Henderson, NV | SPOTTER REPORTED 0.50 INCHES OF WATER IN 30 MINUTES. |
| Sep 11, 2:35 PM PDT | FLASH FLOOD | 2 Se Henderson, NV | SPOTTER REPORTS THAT THE INTERSECTION OF WARM SPRINGS AND EASTERN IS IMPASSABLE. ALSO REPORTS AT LEWIS AND CASINO CENTER 3 TO 4 INCHES OF WATER IS FLOWING ACROSS ROAD. |
| Sep 11, 2:51 PM PDT | HEAVY RAIN 0.79 | 3 Sse Henderson, NV | TRAINED SPOTTER REPORTED 0.79 INCHES OF RAIN IN THE LAST HOUR. |
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, 8.9 hours before the alert went out and 61 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
- 2 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 1725 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
600 WGUS55 KVEF 112051 FFWVEF NVC003-112245- /O.NEW.KVEF.FF.W.0201.120911T2051Z-120911T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 151 PM PDT TUE SEP 11 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CLARK COUNTY IN SOUTHERN NEVADA... * UNTIL 345 PM PDT. * AT 143 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM EXTENDING FROM THE NORTHERN STRIP IN THE CENTRAL VALLEY TO SOUTH OF ANTHEM IN THE SOUTHERN PORTION OF THE VALLEY AND WAS MOVING TO THE EAST AT 15 MPH. * LOCATIONS IMPACTED INCLUDE... CENTRAL...EASTERN AND SOUTHERN LAS VEGAS...HENDERSON...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 3610 11494 3590 11494 3590 11515 3610 11517 $$ JS
2 follow-up statements
776 WGUS75 KVEF 112145 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 245 PM PDT TUE SEP 11 2012 NVC003-112245- /O.CON.KVEF.FF.W.0201.000000T0000Z-120911T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 245 PM PDT TUE SEP 11 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM PDT FOR CENTRAL CLARK COUNTY... AT 239 PM PDT...RADAR INDICATED HEAVY RAIN MOVING AWAY FROM HENDERSON. SEVERAL TRAINED WEATHER SPOTTERS HAVE REPORTED FLASH FLOODING OCCURRING IN THE AREA...AND THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM. LOCATIONS IMPACTED INCLUDE... HENDERSON. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3610 11494 3590 11494 3590 11515 3610 11517 $$ MORGAN
371 WGUS75 KVEF 112240 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 340 PM PDT TUE SEP 11 2012 NVC003-112250- /O.EXP.KVEF.FF.W.0201.000000T0000Z-120911T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 340 PM PDT TUE SEP 11 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM PDT FOR CENTRAL CLARK COUNTY... THE FLASH FLOOD WARNING FOR THE SOUTHEAST LAS VEGAS VALLEY HAS EXPIRED AND BEEN REPLACED BY A NEW FLASH FLOOD WARNING VALID UNTIL 545 PM. LAT...LON 3610 11494 3590 11494 3590 11515 3610 11517 $$ MORGAN
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 3:24 AM PDT | Flash Flood Warning | VEF | Clark | 111 min |
| Sep 11, 4:52 AM PDT | Flash Flood Warning | VEF | Nye | 113 min |
| Sep 11, 8:28 AM PDT | Areal Flood Advisory | VEF | Lincoln | 3 hr |
| Sep 11, 11:33 AM PDT | Areal Flood Advisory | VEF | Clark | 3 hr |
| Sep 11, 12:32 PM PDT | Flash Flood Warning | VEF | Clark | 88 min |
| Sep 11, 1:44 PM PDT | Areal Flood Advisory | VEF | Clark | 27 min |
| Sep 11, 2:08 PM PDT | Flash Flood Warning | VEF | Clark | 93 min |
| Sep 11, 2:16 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 44 min |
| Sep 11, 2:18 PM PDT | Flash Flood Warning | VEF | Clark | 4 hr |
| Sep 11, 3:39 PM PDT | Flash Flood Warning | VEF | Clark | 2 hr |
| Sep 11, 4:02 PM PDT | Flash Flood Warning | VEF | Clark | 118 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.