Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 9, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 5, 2012, 4:17 PM MDT for Boulder County, Colorado. It was in force for 118 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 5, 2012, 4:17 PM MDT (22:17 UTC)
- Expired
- Jul 5, 2012, 6:15 PM MDT
- In force
- 118 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Boulder County, CO
The radar
The Denver radar (KFTG), 79 km from the middle of the area, began a volume at 22:19 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 5, 4:40 PM MDT | FLASH FLOOD | 2 Sse Gold Hill, CO | A THUNDERSTORM PRODUCED HEAVY RAIN ACROSS THE FOURMILE BURN SCAR. NINE TENTHS OF AN INCH OF RAIN WAS REPORTED IN 30 MINUTES AT SUNSHINE. LOTS OF DEBRIS WAS REPORTED ACROSS FOURMILE DRIVE AT NANCY MINE ROAD. THERE WAS A ROCKSLIDE AT FOURMILE AND LOGAN MILL ROAD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.3 hours before the alert went out and 186 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
- 313 J/kg
- Mixed-layer CIN
- -227 J/kg
- Mixed-layer LCL
- 1462 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
319 WGUS55 KBOU 052217 FFWBOU COC013-060015- /O.NEW.KBOU.FF.W.0009.120705T2217Z-120706T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 417 PM MDT THU JUL 5 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO * UNTIL 615 PM MDT * AT 416 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR SUMMERVILLE...OR 33 MILES NORTHWEST OF DENVER. THIS STORM WAS MOVING NORTH AT 20 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...CRISMAN AND GOLD HILL. TRAINED WEATHER SPOTTERS REPORT THAT QUARTER OF AN INCH OF RAIN FELL IN 10 MINUTES. ADDITIONAL RAIN IS EXPECTED FOR THE NEXT HOUR. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. TURN AROUND...DO NOT DROWN. THIS IS A LIFE THREATENING SITUATION. HEAVY RAINFALL WILL CAUSE EXTENSIVE AND SEVERE FLASH FLOODING OF CREEKS...STREAMS...AND DITCHES IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS IMPACTED INCLUDE FOURMILE CREEK...GOLD RUN...AND FOURMILE CANYON CREEK. SEVERE DEBRIS FLOWS CAN ALSO BE ANTICIPATED ACROSS ROADS. ROADS AND DRIVEWAYS MAY BE WASHED AWAY IN PLACES. IF YOU ENCOUNTER FLOOD WATERS...CLIMB TO SAFETY. && LAT...LON 4007 10544 4009 10533 4003 10535 4002 10543 $$
3 follow-up statements
452 WGUS75 KBOU 052307 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 507 PM MDT THU JUL 5 2012 COC013-060015- /O.CON.KBOU.FF.W.0009.000000T0000Z-120706T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOULDER CO- 507 PM MDT THU JUL 5 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR CENTRAL BOULDER COUNTY... AT 505 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH FLOODING IN THE FOURMILE BURN AREA. THE STRONGEST THUNDERSTORM HAD MOVED NORTH OF THE BURN AREA...BUT ANOTHER THUNDERSTORM WAS LOCATED NEAR SUNSHINE...OR ABOUT 31 MILES NORTHWEST OF DENVER. THIS STORM WAS MOVING NORTH AT 25 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...CRISMAN AND GOLD HILL. FLASH FLOODING WAS REPORTED IN GOLD RUN...AT THE INTERSECTION OF GOLD RUN ROAD AND FOURMILE CANYON DRIVE...AND IN THE CRISMAN AREA. AUTOMATED RAIN GAUGES INDICATE THAT BETWEEN 0.5 AND 0.9 INCHES OF RAIN FELL OVER THE BURN AREA IN 30 MINUTES. FLOODING MAY ALSO OCCUR DOWNSTREAM OF THE BURN AREA ALONG FOURMILE CANYON CREEK TO THE MOUTH OF THE CANYON AND ALONG FOURMILE CREEK TO HIGHWAY 119. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A LIFE THREATENING SITUATION. HEAVY RAINFALL WILL CAUSE EXTENSIVE AND SEVERE FLASH FLOODING OF CREEKS...STREAMS...AND DITCHES IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS IMPACTED INCLUDE FOURMILE CREEK...GOLD RUN...AND FOURMILE CANYON CREEK. SEVERE DEBRIS FLOWS CAN ALSO BE ANTICIPATED ACROSS ROADS. ROADS AND DRIVEWAYS MAY BE WASHED AWAY IN PLACES. IF YOU ENCOUNTER FLOOD WATERS...CLIMB TO SAFETY. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER CLIMB TO HIGHER GROUND. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. && LAT...LON 4007 10544 4009 10533 4003 10535 4002 10543 $$ GIMMESTAD
616 WGUS75 KBOU 052345 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 545 PM MDT THU JUL 5 2012 COC013-060015- /O.CON.KBOU.FF.W.0009.000000T0000Z-120706T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOULDER CO- 545 PM MDT THU JUL 5 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR THE FOURMILE BURN AREA IN CENTRAL BOULDER COUNTY... AT 543 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT FLASH FLOODING WAS SUBSIDING IN THE FOURMILE BURN AREA. ROCK AND MUD SLIDES OCCURRED ALONG FOURMILE CANYON DRIVE NEAR LOGAN MILL ROAD... NANCY MINE ROAD...AND WALLSTREET RESULTING IN THE ROAD BEING CLOSED. THERE WAS ALSO FLOODING ALONG GOLD RUN...AND GOLD RUN ROAD WAS CLOSED. RUNOFF WILL BE SUBSIDING OVER THE NEXT 30 MINUTES BUT RESIDENTS SHOULD BE ALERT TO POSSIBLE ROAD DAMAGE AND STAY OUT OF FLOODED AREAS. IT ONLY TAKES A FEW INCHES OF RAPIDLY FLOWING WATER TO KNOCK YOU OFF OF YOUR FEET. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...CRISMAN AND GOLD HILL. PRECAUTIONARY/PREPAREDNESS ACTIONS... HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...STREAMS...AND DITCHES IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS AFFECTED BY EXCESSIVE RUNOFF INCLUDE FOURMILE CREEK...GOLD RUN...AND FOURMILE CANYON CREEK. WATER WILL BE FLOWING DOWN ROADWAYS. ROCK SLIDES OR DEBRIS FLOWS CAN ALSO BE EXPECTED. STAY OUT OF FLOODED AREAS. && LAT...LON 4007 10544 4009 10533 4003 10535 4002 10543 $$ GIMMESTAD
307 WGUS75 KBOU 060018 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 618 PM MDT THU JUL 5 2012 COC013-060027- /O.EXP.KBOU.FF.W.0009.000000T0000Z-120706T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOULDER CO- 618 PM MDT THU JUL 5 2012 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR THE FOURMILE BURN AREA IN CENTRAL BOULDER COUNTY... FLOOD WATERS HAVE SUBSIDED AND FLASH FLOODING IS NO LONGER EXPECTED. ROAD CLOSURES ON FOURMILE CANYON DRIVE AND GOLD RUN ROAD MAY REMAIN IN EFFECT THIS EVENING AS ROCK AND MUD SLIDES AND EROSION TO ROADS IN THE AREA ARE CLEANED UP. LAT...LON 4007 10544 4009 10533 4003 10535 4002 10543 $$ GIMMESTAD
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:25 PM MDT | Special Weather Statement | BOU | Phillips | 35 min |
| Jul 5, 1:07 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Grand, Larimer | 27 min |
| Jul 5, 2:11 PM MDT | Areal Flood Advisory | BOU | Larimer | 116 min |
| Jul 5, 2:54 PM MDT | Areal Flood Advisory | BOU | Clear Creek | 96 min |
| Jul 5, 3:56 PM MDT | Areal Flood Advisory | BOU | Boulder | 94 min |
| Jul 5, 4:42 PM MDT | Areal Flood Advisory | BOU | Boulder | 68 min |
| Jul 5, 4:42 PM MDT | Areal Flood Advisory | BOU | Boulder | 93 min |
Nearby
Flash Flood Warnings in Colorado, 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.