Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 75, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 2:21 PM MST for Mohave County, Arizona. It was in force for 114 min. 1 report 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
- Jul 31, 2012, 2:21 PM MST (21:21 UTC)
- Expired
- Jul 31, 2012, 4:15 PM MST
- In force
- 114 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County Mohave County, AZ
The radar
The Las Vegas radar (KESX), 84 km from the middle of the area, began a volume at 21:22 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 |
|---|---|---|---|
| Jul 31, 3:07 PM MST | FLASH FLOOD | Ssw Oatman, AZ | A SPOTTER REPORTED BOULDERS IN THE ROAD ALONG HIGHWAY 66. PORTIONS OF THE ROAD FROM BULLHEAD CITY TO OATMAM HAS BEEN WASHED OUT. IN ADDITION THE SPOTTER RECEIVED 1.80 INCHES OF RAIN IN ABOUT 1 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, 9.4 hours before the alert went out and 179 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
- 121 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1334 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- -43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
283 WGUS55 KVEF 312121 FFWVEF AZC015-312315- /O.NEW.KVEF.FF.W.0075.120731T2121Z-120731T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 221 PM MST TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... WEST CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA... * UNTIL 415 PM MST. * AT 213 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR OATMAN...OR 15 MILES SOUTHEAST OF BULLHEAD CITY...MOVING NORTH AT 10 MPH. * LOCATIONS IMPACTED INCLUDE... OATMAN. 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 3509 11452 3515 11432 3496 11430 3493 11450 $$ SC
2 follow-up statements
993 WGUS75 KVEF 312135 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 235 PM MST TUE JUL 31 2012 AZC015-312315- /O.CON.KVEF.FF.W.0075.000000T0000Z-120731T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MOHAVE AZ- 235 PM MST TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST FOR WEST CENTRAL MOHAVE COUNTY... AT 226 PM MST...THE PUBLIC REPORTED A THUNDERSTORM PRODUCING VERY HEAVY RAIN IN OATMAN AND ALL WASHES WERE RUNNING RAPIDLY. ADDITIONALLY...TWO RAIN GAGES IN THE VICINITY OF OATMAN HAVE RECEIVED GREATER THAN ONE HALF INCH OF RAINFALL IN 15 MINUTES. THIS STORM IS CAPABLE OF PRODUCING IN EXCESS ONE INCH OF RAINFALL IN 30 MINUTES OR LESS. THIS STORM WAS LOCATED JUST NORTH OF OATMAN...OR 10 MILES SOUTHEAST OF BULLHEAD CITY...MOVING NORTH AT 10 MPH. LOCATIONS IMPACTED INCLUDE... OATMAN PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3509 11452 3515 11432 3496 11430 3493 11450 $$ SC
143 WGUS75 KVEF 312226 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 326 PM MST TUE JUL 31 2012 AZC015-312315- /O.CON.KVEF.FF.W.0075.000000T0000Z-120731T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MOHAVE AZ- 326 PM MST TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST FOR WEST CENTRAL MOHAVE COUNTY... AT 314 PM MST...NATIONAL WEATHER SERVICE RADAR INDICATED THE HEAVIEST RAIN HAS MOVED TO THE NORTH. A TRAINED WEATHER SPOTTER REPORTED 1.80 INCHES OF RAINFALL IN ONE HOUR IN OATMAN. ROCKS AND DEBRIS HAVE BEEN REPORTED ACROSS ROUTE 66 AND THE ROAD IS CLOSED TO BULLHEAD CITY. 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 3509 11452 3515 11432 3496 11430 3493 11450 $$ SC
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 2:29 AM MST | Flash Flood Watch | VEF | Mohave | 19 hr |
| Jul 31, 12:14 PM MST | Areal Flood Advisory | VEF | Mohave | 83 min |
| Jul 31, 1:55 PM MST | Flash Flood Warning | VEF | Mohave | 2 hr |
| Jul 31, 2:42 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 31, 2:48 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 31, 3:12 PM MST | Areal Flood Advisory | VEF | Mohave | 113 min |
| Jul 31, 3:24 PM MST | Flash Flood Warning | VEF | Mohave | 111 min |
| Jul 31, 4:15 PM MST | Flash Flood Warning | VEF | Mohave | 2 hr |
| Jul 31, 4:29 PM MST | Flash Flood Warning | VEF | Mohave | 2 hr |
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.