Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 12, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 6, 2012, 5:38 PM MDT for Larimer County, Colorado. It was in force for 103 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 6, 2012, 5:38 PM MDT (23:38 UTC)
- Expired
- Jul 6, 2012, 7:21 PM MDT
- In force
- 103 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Larimer County, CO
The radar
The Cheyenne radar (KCYS), 74 km from the middle of the area, began a volume at 23:42 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, 11.6 hours before the alert went out and 204 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2053 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
092 WGUS55 KBOU 062338 FFWBOU COC069-070230- /O.NEW.KBOU.FF.W.0012.120706T2338Z-120707T0230Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 538 PM MDT FRI JUL 6 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL LARIMER COUNTY IN NORTH CENTRAL COLORADO * UNTIL 830 PM MDT * AT 525 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 14 MILES SOUTH OF BUCKHORN MOUNTAIN...OR 14 MILES SOUTHWEST OF FORT COLLINS. THIS STORM WAS MOVING NORTH AT 10 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE HIGH PARK BURN AREA...POUDRE PARK...MISHOWAKA AND BUCKHORN MOUNTAIN. THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES... CACHE LA POUDRE RIVER...SOUTH FORK CACHE LA POUDRE RIVER...LITTLE BEAVER CREEK...PENDERGRASS CREEK...PENNOCK CREEK...BENNETT CREEK... ELD CREEK...NORTH FORK CACHE LA POUDRE RIVER...MILL CREEK...GORDON CREEK...MANHATTAN CREEK...REDSTONE CREEK...BUCKHORN CREEK AND SHEEP CREEK. ANOTHER AREA OF THUNDERSTORMS OVER SOUTHERN LARIMER COUNTY IS EXPECTED TO MOVE INTO THE HIGH PARK BURN AREA WITHIN THE HOUR. SEVERAL MUDSLIDES AND SOME FLOODING HAS ALREADY OCCURRED IN THE BURN AREA FROM STORMS EARLIER THIS AFTERNOON...AND ADDITIONAL RAINFALL WILL CONTINUE TO EXACERBATE THE POTENTIAL FOR FLASH FLOODING. 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. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS AND STREAMS...ROADS...AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN THE HIGH PARK BURN AREA. && LAT...LON 4069 10556 4077 10521 4056 10516 4057 10552 $$
1 follow-up statement
869 WGUS75 KBOU 070121 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 721 PM MDT FRI JUL 6 2012 COC069-070130- /O.CAN.KBOU.FF.W.0012.000000T0000Z-120707T0230Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LARIMER CO- 721 PM MDT FRI JUL 6 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL LARIMER COUNTY... THE STORMS THAT PROMPTED THE WARNING HAS EXITED THE AREA. NO ADDITIONAL REPORTS OF FLOODING HAVE BEEN RECEIVED THEREFORE THE FLASH FLOOD WARNING HAS BEEN CANCELLED. LAT...LON 4069 10556 4077 10521 4056 10516 4057 10552 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 12:45 PM MDT | Areal Flood Advisory | BOU | Larimer | 90 min |
| Jul 6, 1:06 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 6, 1:55 PM MDT | Areal Flood Advisory | BOU | Jefferson, Park | 80 min |
| Jul 6, 2:12 PM MDT | Areal Flood Advisory | BOU | Larimer | 93 min |
| Jul 6, 3:23 PM MDT | Areal Flood Advisory | BOU | Douglas | 82 min |
| Jul 6, 3:36 PM MDT | Flash Flood Warning | BOU | Douglas | 2 hr |
| Jul 6, 4:22 PM MDT | Areal Flood Advisory | BOU | Larimer | 83 min |
| Jul 6, 4:36 PM MDT | Areal Flood Advisory | BOU | Boulder | 63 min |
| Jul 6, 4:52 PM MDT | Areal Flood Advisory | BOU | Douglas | 83 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.