Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 7, 2012, 4:53 PM MDT for Boulder County, Colorado. It was in force for 106 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 7, 2012, 4:53 PM MDT (22:53 UTC)
- Expired
- Jul 7, 2012, 6:39 PM MDT
- In force
- 106 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Boulder County, CO
The radar
The Denver radar (KFTG), 78 km from the middle of the area, began a volume at 22:55 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, 10.9 hours before the alert went out and 185 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
- 64 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
732
WGUS55 KBOU 072253
FFWBOU
COC013-080100-
/O.NEW.KBOU.FF.W.0018.120707T2253Z-120708T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
453 PM MDT SAT JUL 7 2012
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO
* UNTIL 700 PM MDT
* AT 453 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM 2 MILES SOUTHWEST OF GOLD
HILL...OR 34 MILES NORTHWEST OF DENVER. THIS STORM WAS MOVING NORTH
AT 5 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...CRISMAN AND GOLD
HILL.
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 4008 10542 4008 10536 4005 10534 4002 10538
4003 10543
$$1 follow-up statement
759
WGUS75 KBOU 080039
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
639 PM MDT SAT JUL 7 2012
COC013-080049-
/O.CAN.KBOU.FF.W.0018.000000T0000Z-120708T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOULDER CO-
639 PM MDT SAT JUL 7 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL BOULDER
COUNTY...
THE STORM THAT PROMPTED THE WARNING FOR THE 4 MILE BURN HAS
WEAKENED AND IS NO LONGER EXPECTED TO PRODUCE FLASH FLOODING.
ONLY LIGHT RAIN IS EXPECTED THROUGH THE EVENING.
LAT...LON 4008 10542 4008 10536 4005 10534 4002 10538
4003 10543
$$The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 6:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Elbert | 43 min |
| Jul 6, 6:57 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 50 min |
| Jul 6, 8:26 PM MDT | Areal Flood Advisory | BOU | Morgan, Washington | 94 min |
| Jul 6, 8:41 PM MDT | Flash Flood Watch | BOU | Arapahoe, Boulder, Broomfield, Clear Creek, Douglas, Elbert and 8 more | 32 hr |
| Jul 6, 8:56 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 6, 9:01 PM MDT | Areal Flood Advisory | BOU | Washington | 59 min |
| Jul 6, 9:06 PM MDT | Flash Flood Warning | BOU | Boulder | 97 min |
| Jul 6, 9:46 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Washington | 44 min |
| Jul 6, 11:20 PM MDT | Areal Flood Advisory | BOU | Logan, Washington, Weld | 115 min |
| Jul 7, 3:08 PM MDT | Areal Flood Advisory | BOU | Boulder | 97 min |
| Jul 7, 3:23 PM MDT | Areal Flood Advisory | BOU | Clear Creek | 97 min |
| Jul 7, 3:41 PM MDT | Flash Flood Warning | BOU | Boulder | 94 min |
| Jul 7, 3:45 PM MDT | Flash Flood Warning | BOU | Boulder | 90 min |
| Jul 7, 3:57 PM MDT | Flash Flood Warning | BOU | Clear Creek | 93 min |
| Jul 7, 4:19 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver, Douglas, Jefferson | 86 min |
| Jul 7, 4:30 PM MDT | Areal Flood Advisory | BOU | Boulder | 90 min |
| Jul 7, 4:36 PM MDT | Areal Flood Advisory | BOU | Larimer | 84 min |
| Jul 7, 4:49 PM MDT | Areal Flood Advisory | BOU | Larimer | 86 min |
| Jul 7, 5:01 PM MDT | Areal Flood Advisory | BOU | Boulder | 119 min |
| Jul 7, 5:35 PM MDT | Areal Flood Advisory | BOU | Boulder | 85 min |
| Jul 7, 5:59 PM MDT | Areal Flood Advisory | BOU | Larimer | 91 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.