Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 15, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 7, 2012, 3:41 PM MDT for Boulder County, Colorado. It was in force for 94 min. 3 reports 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 7, 2012, 3:41 PM MDT (21:41 UTC)
- Expired
- Jul 7, 2012, 5:15 PM MDT
- In force
- 94 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Boulder County, CO
The radar
The Denver radar (KFTG), 82 km from the middle of the area, began a volume at 21:41 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 7, 4:40 PM MDT | FLASH FLOOD | 2 Ese Nederland, CO | MAGNOLIA ROAD IS WASHED OUT. |
| Jul 7, 5:15 PM MDT | HEAVY RAIN 2.92 | 2 Ene Nederland, CO | |
| Jul 7, 5:15 PM MDT | HEAVY RAIN 3.11 | 2 Ene Nederland, CO |
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, 9.7 hours before the alert went out and 191 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.
991
WGUS55 KBOU 072141
FFWBOU
COC013-072315-
/O.NEW.KBOU.FF.W.0015.120707T2141Z-120707T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
341 PM MDT SAT JUL 7 2012
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO
* UNTIL 515 PM MDT
* AT 339 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM 3 MILES NORTHEAST OF
NEDERLAND...OR 33 MILES NORTHWEST OF DENVER. THIS STORM WAS SLOWLY
MOVING EAST.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEDERLAND.
AUTOMATED RAIN GAUGES AT SAINT ALBANS INDICATE 1.81 INCHES OF RAIN
IN AN HOUR. WITH THE SLOW STORM MOVEMENT ADDITIONAL HEAVY RAIN IS
LIKELY.
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.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY AS THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A
FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR
VEHICLE. TURN AROUND...DO NOT DROWN.
&&
LAT...LON 4002 10551 4002 10540 3996 10539 3994 10547
3996 10551
$$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, 3:45 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, 4:53 PM MDT | Flash Flood Warning | BOU | Boulder | 106 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.