Alert archive / Nevada / Flash Flood Warnings in 2011
Flash Flood Warning 86, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 13, 2011, 7:42 AM PDT for Clark County, Nevada. It was in force for 2 hr. 2 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 13, 2011, 7:42 AM PDT (14:42 UTC)
- Expired
- Sep 13, 2011, 9:45 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), 59 km from the middle of the area, began a volume at 14:43 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 13, 8:00 AM PDT | FLASH FLOOD | 5 E Downtown Las Vegas, NV | A WEATHER SPOTTER REPORTED THAT 12 TO 14 INCHES OF WATER WAS FLOWING ACROSS THE INTERSECTION OF NELLIS BOULEVARD AND STEWART AVENUE. BOTH ROADS WERE COVERED WITH WATER A QUARTER-MILE IN EACH DIRECTION. |
| Sep 13, 8:09 AM PDT | FLASH FLOOD | 4 Ne Downtown Las Vegas, NV | A SWIFT WATER RESCUE WAS REPORTED BY THE CLARK COUNTY FIRE DEPARTMENT AT THE INTERSECTION OF CHEYENNE AVENUE AND LAS VEGAS BOULEVARD. |
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, 2.7 hours before the alert went out and 47 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
- 239 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 1707 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
379 WGUS55 KVEF 131442 FFWVEF NVC003-131645- /O.NEW.KVEF.FF.W.0086.110913T1442Z-110913T1645Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 742 AM PDT TUE SEP 13 2011 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CLARK COUNTY IN SOUTHERN NEVADA... * UNTIL 945 AM PDT. * AT 738 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR NELLIS AIR FORCE BASE...OR 7 MILES EAST OF LAS VEGAS. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY. A GAGE ON THE LAS VEGAS WASH AT LAMB BOULEVARD REPORTED OVER HALF AN INCH OF RAIN IN 15 MINUTES. * LOCATIONS IMPACTED INCLUDE... NELLIS AIR FORCE BASE AND NORTH LAS VEGAS. 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 TWITTER #NWSVEGAS. && LAT...LON 3629 11516 3628 11491 3610 11491 3611 11514 $$ MORGAN
4 follow-up statements
340 WGUS75 KVEF 131516 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 816 AM PDT TUE SEP 13 2011 NVC003-131645- /O.CON.KVEF.FF.W.0086.000000T0000Z-110913T1645Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 816 AM PDT TUE SEP 13 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 AM PDT FOR CENTRAL CLARK COUNTY... AT 809 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING HEAVY RAIN OVER THE NORTHEAST PART OF THE LAS VEGAS VALLEY. AT 800 AM...A TRAINED SPOTTER REPORTED OVER A FOOT OF WATER FLOWING THROUGH THE INTERSECTION OF NELLIS AND STEWART. HEAVY RAIN WILL CONTINUE IN THE AREA...AND THE FLASH FLOOD WARNING REMAINS IN EFFECT. LOCATIONS IMPACTED INCLUDE... NORTH LAS VEGAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS. && LAT...LON 3629 11516 3628 11491 3610 11491 3611 11514 $$ MORGAN
883 WGUS75 KVEF 131546 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 846 AM PDT TUE SEP 13 2011 NVC003-131645- /O.CON.KVEF.FF.W.0086.000000T0000Z-110913T1645Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 846 AM PDT TUE SEP 13 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 AM PDT FOR CENTRAL CLARK COUNTY... AT 841 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT RAIN WAS LETTING UP OVER THE NORTHEAST PART OF THE LAS VEGAS VALLEY. HOWEVER...FLOODING AND A SWIFT WATER RESCUE HAD ALREADY BEEN REPORTED IN THE AREA...AND WATER MAY STILL BE FLOWING. THUS...THE FLASH FLOOD WARNING REMAINS IN EFFECT. LOCATIONS IMPACTED INCLUDE... NELLIS AIR FORCE BASE AND NORTH LAS VEGAS. 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 TWITTER #NWSVEGAS. && LAT...LON 3629 11516 3628 11491 3610 11491 3611 11514 $$ MORGAN
783 WGUS75 KVEF 131614 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 914 AM PDT TUE SEP 13 2011 NVC003-131645- /O.CON.KVEF.FF.W.0086.000000T0000Z-110913T1645Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 914 AM PDT TUE SEP 13 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 AM PDT FOR CENTRAL CLARK COUNTY... AT 907 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE LIGHT RAIN IN THE NORTHEAST LAS VEGAS VALLEY. FLOODING AND A SWIFT WATER RESCUE HAVE ALREADY OCCURRED...AND ALTHOUGH RAIN HAS LET UP SIGNIFICANTLY...THE FLASH FLOOD WARNING WILL REMAIN IN EFFECT UNTIL 945 AM AS WATER IS LIKELY STILL FLOWING. LOCATIONS IMPACTED INCLUDE... NELLIS AIR FORCE BASE AND NORTH LAS VEGAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS. && LAT...LON 3629 11516 3628 11491 3610 11491 3611 11514 $$ MORGAN
652 WGUS75 KVEF 131637 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 937 AM PDT TUE SEP 13 2011 NVC003-131646- /O.EXP.KVEF.FF.W.0086.000000T0000Z-110913T1645Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 937 AM PDT TUE SEP 13 2011 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 945 AM PDT FOR CENTRAL CLARK COUNTY... AT 935 AM PDT...RADAR INDICATED ONLY LIGHT RAIN REMAINING OVER THE NORTHEAST PART OF THE LAS VEGAS VALLEY. FLOODING HAS LIKELY SUBSIDED IN THE AREA...AND THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 945 AM. LAT...LON 3629 11516 3628 11491 3610 11491 3611 11514 $$ MORGAN
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 3:31 AM PDT | Areal Flood Advisory | VEF | Clark | 119 min |
| Sep 13, 3:36 AM PDT | Flash Flood Watch | VEF | Clark | 15 hr |
| Sep 13, 5:46 AM PDT | Areal Flood Advisory | VEF | Clark | 119 min |
| Sep 13, 6:31 AM PDT | Flash Flood Warning | VEF | Clark | 86 min |
| Sep 13, 8:01 AM PDT | Flash Flood Warning | VEF | Clark | 119 min |
| Sep 13, 8:23 AM PDT | Flash Flood Warning | VEF | Clark | 112 min |
Nearby
Flash Flood Warnings in Nevada, 2011Every flash flood warning in 2011
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.