Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 137, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 20, 2012, 7:37 PM MST for Mohave County, Arizona. It was in force for 4 hr. 3 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
- Aug 20, 2012, 7:37 PM MST (02:37 UTC)
- Expired
- Aug 20, 2012, 11:30 PM MST
- In force
- 4 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County Mohave County, AZ
The radar
The Las Vegas radar (KESX), 103 km from the middle of the area, began a volume at 02:40 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 |
|---|---|---|---|
| Aug 20, 8:00 PM MST | HEAVY RAIN 2.76 | 5 Wnw Hualapai Mountain, AZ | THE LAZY Y U MOHAVE COUNTY ALERT GAGE MEASURED 1.93 INCHES OF RAIN BETWEEN 7 AND 8 PM WITH A STORM TOTAL OF 2.76 INCHES BY 10 PM. |
| Aug 20, 8:15 PM MST | FLASH FLOOD | 5 Se Kingman, AZ | TRAINED SPOTTER REPORTED VERY HEAVY RAIN WITH A LOT OF WATER AND DEBRIS ON HUALAPAI ROAD BETWEEN MILE MARKERS 5 AND 6. THE ROAD WAS REPORTED AS IMPASSABLE FOR LOW CLEARANCE VEHICLES. |
| Aug 20, 8:24 PM MST | HEAVY RAIN 0 | 2 Sse Kingman, AZ | TRAINED SPOTTER REPORTED VERY HEAVY RAIN, RUNNING WATER AND LOW VISIBILITY ON HUALAPAI ROAD. WIND SPEEDS WERE ESTIMATED AT 40 TO 50 MPH. |
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 00:00Z, 2.6 hours before the alert went out and 197 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
- 633 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 2388 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
179 WGUS55 KVEF 210237 FFWVEF AZC015-210430- /O.NEW.KVEF.FF.W.0137.120821T0237Z-120821T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 737 PM MST MON AUG 20 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA... * UNTIL 930 PM MST. * AT 727 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 6 MILES NORTHWEST OF HUALAPAI MOUNTAIN PARK...OR 6 MILES SOUTHEAST OF KINGMAN ALONG THE HUALAPAI MOUNTAIN ROAD. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY. * LOCATIONS IMPACTED INCLUDE... AREAS NEAR AND ALONG HUALAPAI MOUNTAIN ROAD. 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. 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 3519 11408 3517 11385 3505 11383 3505 11411 $$ JS
4 follow-up statements
934 WGUS75 KVEF 210348 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 848 PM MST MON AUG 20 2012 AZC015-210430- /O.CON.KVEF.FF.W.0137.000000T0000Z-120821T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MOHAVE AZ- 848 PM MST MON AUG 20 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM MST FOR CENTRAL MOHAVE COUNTY... AT 836 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN IN THE HUALAPAI MOUNTAIN ROAD AREA. THIS STORM WAS LOCATED NEAR HUALAPAI MOUNTAIN PARK...OR 12 MILES SOUTHEAST OF KINGMAN. A TRAINED WEATHER SPOTTER IN THE AREA REPORTED FLASH FLOODING AND DEBRIS ON HUALAPAI MOUNTAIN ROAD. THE THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY. LOCATIONS IMPACTED INCLUDE... SOUTHEAST KINGMAN...HUALAPAI MOUNTAIN ROAD AND COUNTY ROAD 259. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES... AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3519 11408 3517 11385 3505 11383 3505 11411 $$ JS
297 WGUS55 KVEF 210429 FFWVEF AZC015-210630- /O.EXT.KVEF.FF.W.0137.000000T0000Z-120821T0630Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 929 PM MST MON AUG 20 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS EXTENDED THE * FLASH FLOOD WARNING FOR... CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA... * UNTIL 1130 PM MST. * AT 915 PM MST...DOPPLER RADER CONTINUED TO SHOW MODERATE TO HEAVY RAIN SOUTHEAST OF KINGMAN OVER THE HUALAPAI MOUNTAIN ROAD. TRAINED WEATHER SPOTTERS AND LAW ENFORCEMENT REPORTED VERY HEAVY RAIN AND FLOODING IN THIS AREA. MOTORISTS SHOULD AVOID FLOODED ROADWAYS AND WAIT FOR WATER TO RECEDE. * LOCATIONS IMPACTED INCLUDE... AREAS SURROUNDING HUALAPAI MOUNTAIN ROAD SOUTHEAST OF KINGMAN. 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 3519 11408 3517 11385 3505 11383 3505 11411 $$ JS
111 WGUS75 KVEF 210554 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1054 PM MST MON AUG 20 2012 AZC015-210630- /O.CON.KVEF.FF.W.0137.000000T0000Z-120821T0630Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MOHAVE AZ- 1054 PM MST MON AUG 20 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM MST FOR CENTRAL MOHAVE COUNTY... AT 1041 PM MST...ONLY LIGHT RAIN WAS INDICATED OVER THE NORTHERN HUALAPAI MOUNTAINS BUT THE EARLIER HEAVY RAIN COULD STILL BE CAUSING FLOOD RELATED PROBLEMS ALONG HUALAPAI MOUNTAIN AND SECONDARY ROADWAYS. THE STORMS THIS EVENING PRODUCED ABUNDANT RAINFALL WITH MEASURED AMOUNTS IN EXCESS OF AN INCH OVER A WIDESPREAD AREA WITH HIGHER AMOUNTS SUCH AS 2.76 INCHES MEASURED BY THE MOHAVE COUNTY ALERT SYSTEM AT LAZY Y U. MOTORISTS THROUGHOUT THIS AREA SHOULD USE CAUTION AND REMAIN ALERT FOR WATER CROSSING THE ROADWAYS. LOCATIONS IMPACTED INCLUDE... PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3519 11408 3517 11385 3505 11383 3505 11411 $$ JS
698 WGUS75 KVEF 210624 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1124 PM MST MON AUG 20 2012 AZC015-210632- /O.EXP.KVEF.FF.W.0137.000000T0000Z-120821T0630Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MOHAVE AZ- 1124 PM MST MON AUG 20 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 1130 PM MST FOR CENTRAL MOHAVE COUNTY. HEAVY RAIN IN THE WARNED AREA HAS ENDED AND FLASH FLOODING IS NO LONGER EXPECTED. THE WARNING WILL BE ALLOWED TO EXPIRE ON TIME HOWEVER...AREA WASHES COULD STILL BE EXPERIENCING ELEVATED WATER LEVELS AND THERE COULD BE PONDING OF WATER ON AREAS ROADWAYS. LAT...LON 3519 11408 3517 11385 3505 11383 3505 11411 $$ JS
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 5:51 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 39 min |
| Aug 20, 6:09 PM MST | Flash Flood Warning | VEF | Mohave | 2 hr |
| Aug 20, 8:01 PM MST | Flash Flood Warning | VEF | Mohave | 119 min |
| Aug 21, 11:39 AM MST | Flash Flood Watch | VEF | Mohave | 36 hr |
| Aug 21, 1:43 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 32 min |
| Aug 21, 3:16 PM MST | Flash Flood Warning | VEF | Mohave | 119 min |
Nearby
Flash Flood Warnings in Arizona, 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.