Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 23, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 30, 2012, 3:27 PM MDT for Boulder County, Colorado. It was in force for 78 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2012, 3:27 PM MDT (21:27 UTC)
- Expired
- Jul 30, 2012, 4:45 PM MDT
- In force
- 78 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Boulder County, CO
The radar
The Denver radar (KFTG), 77 km from the middle of the area, began a volume at 21:27 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.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.5 hours before the alert went out and 184 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
- 36 J/kg
- Mixed-layer CIN
- -260 J/kg
- Mixed-layer LCL
- 2058 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
170 WGUS55 KBOU 302127 FFWBOU COC013-302330- /O.NEW.KBOU.FF.W.0023.120730T2127Z-120730T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 327 PM MDT MON JUL 30 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO * UNTIL 530 PM MDT * AT 324 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 3 MILES SOUTHWEST OF GOLD HILL...OR 34 MILES NORTHWEST OF DENVER. THIS STORM WAS MOVING EAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...CRISMAN AND GOLD HILL. RAIN GAUGES IN THE FOUR MILE BURN AREA HAVE ALREADY RECORDED UP TO 0.70 INCH OF RAIN SINCE 3:00 PM MDT. 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. 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. && LAT...LON 4009 10536 4005 10533 4001 10539 4006 10544 $$ RJK
2 follow-up statements
149 WGUS75 KBOU 302155 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 355 PM MDT MON JUL 30 2012 COC013-302330- /O.CON.KBOU.FF.W.0023.000000T0000Z-120730T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOULDER CO- 355 PM MDT MON JUL 30 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR THE FOUR MILE BURN AREA IN CENTRAL BOULDER COUNTY... AT 347 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE HEAVY RAIN HAS PUSHED EASTWARD AND IS NO LONGER FALLING OVER THE FOUR MILE BURN AREA IN CENTRAL BOULDER COUNTY. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...CRISMAN AND GOLD HILL. AUTOMATED RAIN GAUGES INDICATE THAT 0.90 TO 1.15 INCHES OF RAIN HAVE FALLEN OVER THE NORTHERN AND NORTHEASTERN PORTIONS OF THE FOUR MILE BURN AREA. THE SOUTHERN HALF RECEIVED LESSER AMOUNTS...MOSTLY UNDER 0.40 INCHES. THIS RAIN FELL FROM ABOUT 3:10 PM MDT TO 3:40 PM MDT. WASHES AND ROCKS WERE REPORTED GOING ACROSS LEE HILL ROAD AT 3:39 PM MDT. ALSO...GOLD RUN ROAD IS CLOSED AT DIXON. PRECAUTIONARY/PREPAREDNESS ACTIONS... HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...STREAMS...AND DITCHES IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS AFFECTED BY EXCESSIVE RUNOFF INCLUDE FOURMILE CREEK...GOLD RUN...AND FOURMILE CANYON CREEK. WATER WILL BE FLOWING DOWN ROADWAYS. ROCK SLIDES OR DEBRIS FLOWS CAN ALSO BE EXPECTED. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER CLIMB TO HIGHER GROUND. && LAT...LON 4009 10536 4005 10533 4001 10539 4006 10544 $$ RJK
465 WGUS75 KBOU 302245 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 445 PM MDT MON JUL 30 2012 COC013-302249- /O.CAN.KBOU.FF.W.0023.000000T0000Z-120730T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOULDER CO- 445 PM MDT MON JUL 30 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR THE FOUR MILE BURN AREA IN CENTRAL BOULDER COUNTY... THE RAIN AS WELL AS THE FLOODING OVER THE NORTHERN HALF OF THE FOUR MILE BURN AREA IN CENTRAL BOULDER COUNTY HAS ENDED. FLOOD WATERS HAVE SUBSIDED AND FLASH FLOODING IS NO LONGER EXPECTED. AUTOMATED RAIN GAUGES INDICATE THAT 0.90 TO 1.15 INCHES OF RAIN FELL OVER THE NORTHERN AND NORTHEASTERN PORTIONS OF THE FOUR MILE BURN AREA. THE SOUTHERN HALF RECEIVED LESSER AMOUNTS...MOSTLY UNDER 0.40 INCHES. THIS RAIN FELL FROM ABOUT 3:10 PM MDT TO 3:40 PM MDT. THERE WERE REPORTS OF ROCKS AND MUD OVER GOLD RUN ROAD...AND OVER ROADS IN DIXON AND 4 MILE CANYON. LAT...LON 4009 10536 4005 10533 4001 10539 4006 10544 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 2:09 PM MDT | Special Weather Statement | BOU | Jefferson | 36 min |
| Jul 30, 2:30 PM MDT | Special Weather Statement | BOU | Grand | 30 min |
| Jul 30, 3:04 PM MDT | Special Weather Statement | BOU | Douglas | 26 min |
| Jul 30, 3:12 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 22 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.