Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 24, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 1, 2012, 1:38 PM MDT for Larimer County, Colorado. It was in force for 82 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
- Aug 1, 2012, 1:38 PM MDT (19:38 UTC)
- Expired
- Aug 1, 2012, 3:00 PM MDT
- In force
- 82 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Larimer County, CO
The radar
The Cheyenne radar (KCYS), 71 km from the middle of the area, began a volume at 19:42 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, 7.6 hours before the alert went out and 206 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
- 2829 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
537 WGUS55 KBOU 011938 FFWBOU COC069-012100- /O.NEW.KBOU.FF.W.0024.120801T1938Z-120801T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 138 PM MDT WED AUG 1 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL LARIMER COUNTY IN NORTH CENTRAL COLORADO * UNTIL 300 PM MDT * AT 136 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 4 MILES WEST OF MISHAWAKA...OR 20 MILES WEST OF FORT COLLINS. THIS STORM WAS MOVING NORTHEAST AT 5 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO POUDRE PARK AND MISHAWAKA. DOPPLER RADAR ESTIMATES THAT AROUND ONE INCH OF RAIN HAS FALLEN FROM THIS STORM IN THE LAST 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. 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 4077 10537 4069 10528 4060 10546 4066 10554 $$
2 follow-up statements
072 WGUS75 KBOU 012027 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 227 PM MDT WED AUG 1 2012 COC069-012100- /O.CON.KBOU.FF.W.0024.000000T0000Z-120801T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LARIMER CO- 227 PM MDT WED AUG 1 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR CENTRAL LARIMER COUNTY... AT 221 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 2 MILES WEST OF MISHAWAKA...OR ABOUT 19 MILES NORTHWEST OF FORT COLLINS. THIS STORM WAS NEARLY STATIONARY. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO POUDRE PARK AND MISHAWAKA. DOPPLER RADAR ESTIMATES THAT AROUND ONE INCH OF RAIN HAS FALLEN FROM THIS STORM IN THE LAST HOUR. LIGHT TO MODERATE RAIN CONTINUES OVER THE WARNING AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS AND STREAMS...ROADS...AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO TRIGGER DEBRIS FLOWS OR ROCK SLIDES IN THE HIGH PARK BURN AREA. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER CLIMB TO HIGHER GROUND. && LAT...LON 4077 10537 4069 10528 4060 10546 4066 10554 $$
848 WGUS75 KBOU 012057 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 257 PM MDT WED AUG 1 2012 COC069-012105- /O.EXP.KBOU.FF.W.0024.000000T0000Z-120801T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LARIMER CO- 257 PM MDT WED AUG 1 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 300 PM MDT FOR CENTRAL LARIMER COUNTY... THE STORM THAT PROMPTED THE WARNING HAS EXITED THE AREA. LIGHT RAIN CONTINUES IN THE WARNING AREA...BUT THE THREAT OF FLASH FLOODING HAS DIMINISHED. BE AWARE THAT THERE ARE OTHER STORMS IN LARIMER COUNTY THAT COULD MOVE INTO THE BURN AREA THIS AFTERNOON AND MORE FLOODING RAINFALL COULD BE POSSIBLE. LAT...LON 4077 10537 4069 10528 4060 10546 4066 10554 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 12:45 PM MDT | Special Weather Statement | BOU | Jefferson | 30 min |
| Aug 1, 1:16 PM MDT | Areal Flood Advisory | BOU | Larimer | 89 min |
| Aug 1, 5:15 PM MDT | Special Weather Statement | BOU | Washington | 30 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.