Alert archive / Nevada / Flash Flood Warnings in 2011
Flash Flood Warning 104, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Oct 4, 2011, 11:58 AM PDT for Clark County, Nevada. It was in force for 2 hr. 5 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
- Oct 4, 2011, 11:58 AM PDT (18:58 UTC)
- Expired
- Oct 4, 2011, 2:00 PM 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), 49 km from the middle of the area, began a volume at 18:59 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 |
|---|---|---|---|
| Oct 4, 12:00 PM PDT | FLASH FLOOD | Ne East Las Vegas, NV | SEVERAL AREA RAIN GAUGES REPORTED AROUND AN INCH OF RAIN BETWEEN 1130AM AND 1230PM IN THE VICINITY OF JIMMY DURANTE BLVD AND TROPICANA AVE. SEVERAL CARS BECAME STRANDED IN THE INTERSECTION DUE TO THE HIGH WATER AND A CLARK COUNTY SWIFT WATER RESCUE TEAM HELPED |
| Oct 4, 12:07 PM PDT | HEAVY RAIN 0.5 | 5 Ese Las Vegas, NV | ONE HALF OF AN INCH OF RAIN MEASURED IN 15 MINUTES AT NELLIS AND VEGAS VALLEY. RUNOFF CURB HIGH. |
| Oct 4, 12:08 PM PDT | HEAVY RAIN 0.5 | 5 E Las Vegas, NV | ONE HALF INCH OF RAIN IN 20 MINUTES AND PEA SIZE HAIL. |
| Oct 4, 12:23 PM PDT | FLASH FLOOD | 2 Ene Green Valley, NV | A TRAINED SPOTTER BETWEEN RUSSEL AND SUNSET ON STEPHANIE REPORTED WATER FLOWING OVER AND ABOVE THE CURB AND COVERING THREE QUATERS OF THE ROADWAY. |
| Oct 4, 12:45 PM PDT | FLASH FLOOD | 3 N Green Valley, NV | A TRAINED SPOTTER ON MARKS STREET REPORTED WATER AS DEEP AS 18 INCHES ON THE ROADWAY BETWEEN AMERICAN PACIFIC AND WARM SPRINGS. |
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, 7.0 hours before the alert went out and 52 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
- 722 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 903 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
061 WGUS55 KVEF 041858 FFWVEF NVC003-042100- /O.NEW.KVEF.FF.W.0104.111004T1858Z-111004T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1158 AM PDT TUE OCT 4 2011 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 1150 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR SAM BOYD STADIUM...OR NEAR HENDERSON...MOVING NORTH AT 10 MPH. * LOCATIONS IMPACTED INCLUDE... SAM BOYD STADIUM...EAST LAS VEGAS...HIGHWAY 93...AND BOULDER HIGHWAY. 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 3620 11512 3620 11490 3601 11499 3600 11512 $$ SC
4 follow-up statements
887 WGUS75 KVEF 041919 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1219 PM PDT TUE OCT 4 2011 NVC003-042100- /O.CON.KVEF.FF.W.0104.000000T0000Z-111004T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 1219 PM PDT TUE OCT 4 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT FOR CENTRAL CLARK COUNTY... AT 1208 PM PDT...TRAINED WEATHER SPOTTERS REPORTED A THUNDERSTORM PRODUCING VERY HEAVY RAIN. MULTIPLE RAIN GAUGES IN THE AREA HAVE OBSERVED BETWEEN ONE HALF AND THREE QUARTERS OF AN INCH OF RAIN SINCE 1145 AM. THE INITIAL STORM WAS LOCATED NEAR EAST LAS VEGAS...OR 7 MILES NORTH OF HENDERSON...MOVING NORTH AT 15 MPH. A SECOND STORM HAS DEVELOPED TO THE SOUTH AS WAS LOCATED NEAR THE INTERSECTION OF HIGHWAY 93 AND 215. LOCATIONS IMPACTED INCLUDE... HENDERSON...SAMS TOWN...AND BOULDER HIGHWAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3620 11512 3620 11490 3601 11499 3600 11512 $$ SC
915 WGUS75 KVEF 041940 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1240 PM PDT TUE OCT 4 2011 NVC003-042100- /O.CON.KVEF.FF.W.0104.000000T0000Z-111004T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 1240 PM PDT TUE OCT 4 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT FOR CENTRAL CLARK COUNTY... AT 1223 PM PDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING ALONG STEPHANIE STREET BETWEEN SUNSET AND RUSSELL ROAD. AT 1235 PM THIS STORM WAS LOCATED NEAR SAMS TOWN...MOVING NORTH AT 15 MPH. INTENSE RAINFALL RATES...ONE HALF INCH OF RAIN IN 10 TO 15 MINUTES HAVE BEEN OBSERVED WITH THESE STORMS. SEVERAL RAIN GAUGES HAVE RECORDED THREE QUARTERS TO NEAR ONE INCH OF RAINFALL SINCE 1145 AM. LOCATIONS IMPACTED INCLUDE... HENDERSON...SAMS TOWN...AND BOULDER HIGHWAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. 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 3620 11512 3620 11490 3601 11499 3600 11512 $$ SC
411 WGUS75 KVEF 042000 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 100 PM PDT TUE OCT 4 2011 NVC003-042100- /O.CON.KVEF.FF.W.0104.000000T0000Z-111004T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 100 PM PDT TUE OCT 4 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT FOR CENTRAL CLARK COUNTY... AT 1248 PM PDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING ALONG MARKS STREET BETWEEN AMERICAN PACIFIC AND WARM SPRINGS AS WELL AS ALONG STEPHANIE BETWEEN RUSSEL AND SUNSET. A THUNDERSTORM PRODUCING VERY HEAVY RAIN WAS LOCATED 8 MILES NORTH OF SAMS TOWN...OR 7 MILES EAST OF DOWNTOWN LAS VEGAS...MOVING NORTH AT 15 MPH. THE HEAVY RAIN WILL BE ENDING BY 115 PM...HOWEVER FLASH FLOODING AND RUNOFF IS EXPECTED TO PERSIST THROUGH 200 PM. LOCATIONS IMPACTED INCLUDE... HENDERSON...GALLERIA MALL...SAMS TOWN AND BOULDER HIGHWAY PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3620 11512 3620 11490 3601 11499 3600 11512 $$ SC
442 WGUS75 KVEF 042054 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 154 PM PDT TUE OCT 4 2011 NVC003-042100- /O.EXP.KVEF.FF.W.0104.000000T0000Z-111004T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLARK NV- 154 PM PDT TUE OCT 4 2011 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 200 PM PDT FOR CENTRAL CLARK COUNTY... THE HEAVY RAIN ENDED SHORTLY AFTER 100 PM OVER THE EASTERN PORTIONS OF THE LAS VEGAS VALLEY. ALTHOUGH RUNOFF MAY CONTINUE TO PRODUCE MINOR FLOODING THE THREAT OF ADDITIONAL FLASH FLOODING HAS ENDED AND THEREFORE THE FLASH FLOOD WARNING FOR CENTRAL CLARK COUNTY WILL BE ALLOWED TO EXPIRE AT 200 PM. LAT...LON 3620 11512 3620 11490 3601 11499 3600 11512 $$ SC
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 3, 6:45 PM PDT | Areal Flood Advisory | VEF | Clark | 46 min |
| Oct 3, 11:12 PM PDT | Areal Flood Advisory | VEF | Clark | 2 hr |
| Oct 4, 4:05 AM PDT | Flash Flood Watch | VEF | Clark, Lincoln | 15 hr |
| Oct 4, 1:31 PM PDT | Flash Flood Warning | VEF | Clark | 87 min |
| Oct 4, 2:14 PM PDT | Wind Advisory | VEF | Clark, Lincoln, Nye | 36 hr |
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.