Alert archive / Nevada / Flash Flood Warnings in 2012
Flash Flood Warning 199, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 11, 2012, 12:32 PM PDT for Clark County, Nevada. It was in force for 88 min. 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 11, 2012, 12:32 PM PDT (19:32 UTC)
- Expired
- Sep 11, 2012, 2:00 PM PDT
- In force
- 88 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), 71 km from the middle of the area, began a volume at 19:34 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, 1:00 PM PDT | FLASH FLOOD | 3 N Summerlin, NV | A SMALL AMOUNT OF RUNNING WATER MOVED ACROSS LONE MOUNTAIN ROAD JUST EAST OF 215 ALONG WITH MUD AND SMALL ROCKS. THE EVENT TIME IS AN ESTIMATE. |
| Sep 11, 1:45 PM PDT | HEAVY RAIN 0 | 2 Ene Summerlin, NV | TRAINED SPOTTER REPORTED 10-12 INCHES OF STANDING WATER AT THE INTERSECTION OF EASTERN AND STEWART. |
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, 7.5 hours before the alert went out and 25 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.
802 WGUS55 KVEF 111932 FFWVEF NVC003-112100- /O.NEW.KVEF.FF.W.0199.120911T1932Z-120911T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1232 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 200 PM PDT. * AT 1225 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR LONE MOUNTAIN...OR NEAR SUMMERLIN. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY. * LOCATIONS IMPACTED INCLUDE... LONE MOUNTAIN AND SUMMERLIN. 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 3625 11541 3627 11525 3615 11527 3615 11542 $$ JS
3 follow-up statements
065 WGUS75 KVEF 111954 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1254 PM PDT TUE SEP 11 2012 NVC003-112100- /O.CON.KVEF.FF.W.0199.000000T0000Z-120911T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 1254 PM PDT TUE SEP 11 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT FOR CENTRAL CLARK COUNTY... AT 1238 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN OVER THE LONE MOUNTAIN AND SUN CITY SUMMERLIN AREA. ONE RAIN GAGE IN THE AREA HAS REPORTED 1.18 INCHES OF RAIN IN THE LAST 30 MINUTES. THE THUNDERSTORM WITH EXCESSIVE RAIN WAS SLOWLY DRIFTING TO THE EAST AND BEGINNING TO IMPACT AREAS EAST OF SUN CITY SUMMERLIN. LOCATIONS IMPACTED INCLUDE... PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3625 11541 3627 11525 3615 11527 3615 11542 $$ JS
147 WGUS75 KVEF 112023 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 123 PM PDT TUE SEP 11 2012 NVC003-112100- /O.CON.KVEF.FF.W.0199.000000T0000Z-120911T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 123 PM PDT TUE SEP 11 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT FOR CENTRAL CLARK COUNTY... AT 109 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SECOND STRONG THUNDERSTORM PRODUCING VERY HEAVY RAIN NEAR LONE MOUNTAIN. RAIN GAGES IN THE FAR NORTHWEST PORTION OF THE VALLEY WERE GENERALLY REPORTING .25 TO .50 INCHES OF RAINFALL HOWEVER...TWO GAGES HAVE MEASURED GREATER THAN .80 INCHES IN THE PAST HOUR WITH ONE GAGE NEAR THE 215 AND SUMMERLIN PARKWAY REPORTING 1.85 INCHES IN THE PAST HOUR. THE THUNDERSTORM WITH EXCESSIVE RAIN WAS DRIFTING SLOWLY TO THE EAST. LOCATIONS IMPACTED INCLUDE... SUMMERLIN AND LONE MOUNTAIN. 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 3625 11541 3627 11525 3615 11527 3615 11542 $$ JS
535 WGUS75 KVEF 112055 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 155 PM PDT TUE SEP 11 2012 NVC003-112103- /O.EXP.KVEF.FF.W.0199.000000T0000Z-120911T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 155 PM PDT TUE SEP 11 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 200 PM PDT FOR CENTRAL CLARK COUNTY... THUNDERSTORMS OVER THE NORTHWEST VALLEY HAVE DISSIPATED AND FLASH FLOODING IS NO LONGER A CONCERN IN THIS AREA. HOWEVER...EARLIER HEAVY RAIN WILL CONTINUE TO PRODUCE ELEVATED WATER LEVELS IN WASHES AND PONDING OF WATER ON ROADWAYS. LAT...LON 3625 11541 3627 11525 3615 11527 3615 11542 $$ JS
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, 1:44 PM PDT | Areal Flood Advisory | VEF | Clark | 27 min |
| Sep 11, 1:51 PM PDT | Flash Flood Warning | VEF | Clark | 114 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.