Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 27, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 17, 2011, 2:57 PM MDT for Clear Creek County, Gilpin County, Colorado. It was in force for 3 hr. 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 17, 2011, 2:57 PM MDT (20:57 UTC)
- Expired
- Jul 17, 2011, 6:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Clear Creek County, CO, Gilpin County, CO
The radar
The Denver radar (KFTG), 89 km from the middle of the area, began a volume at 20:57 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, 9.0 hours before the alert went out and 202 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
- 94 J/kg
- Mixed-layer CIN
- -352 J/kg
- Mixed-layer LCL
- 1885 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
753
WGUS55 KBOU 172057
FFWBOU
COC019-047-180000-
/O.NEW.KBOU.FF.W.0027.110717T2057Z-110718T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
257 PM MDT SUN JUL 17 2011
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL GILPIN COUNTY IN CENTRAL COLORADO
EXTREME NORTH CENTRAL CLEAR CREEK COUNTY IN CENTRAL COLORADO
* UNTIL 600 PM MDT
* AT 256 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM 4 MILES SOUTH OF TOLLAND...OR
35 MILES WEST OF DENVER. THIS STORM WAS MOVING NORTH AT 10 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TOLLAND AND
DUMONT.
DOPPLER RADAR ESTIMATES OVER TWO INCHES OF RAIN HAS FALLEN IN THE
LAST 45 MINUTES OVER NORTH CENTRAL CLEAR CREEK AND CENTRAL GILPIN
COUNTIES.
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 ROCK SLIDES OR DEBRIS FLOWS IN STEEP TERRAIN.
IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...
OR CREEKS...WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.
&&
LAT...LON 3993 10563 3993 10551 3979 10553 3979 10556
3978 10558 3979 10558 3978 10559 3978 10563
3979 10563 3979 10564
$$3 follow-up statements
335
WGUS75 KBOU 172132
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
332 PM MDT SUN JUL 17 2011
COC019-047-180000-
/O.CON.KBOU.FF.W.0027.000000T0000Z-110718T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GILPIN CO-CLEAR CREEK CO-
332 PM MDT SUN JUL 17 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
EXTREME NORTH CENTRAL CLEAR CREEK AND WESTERN GILPIN COUNTIES...
AT 330 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH HEAVY RAIN REDEVELOPING OVER NORTH CENTRAL CLEAR
CREEK COUNTY. THESE STORMS WERE MOVING NORTH AT 10 MPH.
LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
TOLLAND AND DUMONT.
DOPPLER RADAR ESTIMATES THAT UP TO THREE INCHES OF RAIN MAY HAVE
FALLEN OVER CENTRAL GILPIN COUNTY IN THE LAST HOUR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS
AND STREAMS...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO
TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN STEEP TERRAIN.
IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...
OR CREEKS...WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.
&&
LAT...LON 3993 10563 3993 10551 3979 10553 3979 10556
3978 10558 3979 10558 3978 10559 3978 10563
3979 10563 3979 10564
$$944
WGUS75 KBOU 172219
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
419 PM MDT SUN JUL 17 2011
COC019-047-180000-
/O.CON.KBOU.FF.W.0027.000000T0000Z-110718T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GILPIN CO-CLEAR CREEK CO-
419 PM MDT SUN JUL 17 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
EXTREME NORTH CENTRAL CLEAR CREEK AND WESTERN GILPIN COUNTIES...
AT 417 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
MODERATE TO HEAVY RAIN FROM THUNDERSTORMS FROM NORTH CENTRAL CLEAR
CREEK INTO CENTRAL GILPIN COUNTIES. THE STORMS WERE MOVING
NORTH AT 15 MPH.
LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
TOLLAND AND DUMONT.
DOPPLER RADAR ESTIMATES THAT AROUND 3 INCHES OF RAIN MAY HAVE FALLEN
THIS AFTERNOON OVER PORTIONS OF CENTRAL GILPIN COUNTY NEAR TOLLAND.
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 ROCK SLIDES OR DEBRIS FLOWS IN STEEP TERRAIN.
IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...
OR CREEKS...WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.
&&
LAT...LON 3993 10563 3993 10551 3979 10553 3979 10556
3978 10558 3979 10558 3978 10559 3978 10563
3979 10563 3979 10564
$$852
WGUS75 KBOU 172355
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
555 PM MDT SUN JUL 17 2011
COC019-047-180005-
/O.EXP.KBOU.FF.W.0027.000000T0000Z-110718T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GILPIN CO-CLEAR CREEK CO-
555 PM MDT SUN JUL 17 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 600 PM MDT FOR EXTREME
NORTH CENTRAL CLEAR CREEK AND WESTERN GILPIN COUNTIES...
FLOOD WATERS HAVE SUBSIDED AND FLASH FLOODING IS NO LONGER EXPECTED.
LAT...LON 3993 10563 3993 10551 3979 10553 3979 10556
3978 10558 3979 10558 3978 10559 3978 10563
3979 10563 3979 10564
$$The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 6:33 PM MDT | River Flood Advisory | BOU | Morgan | 40 hr |
| Jul 16, 6:33 PM MDT | River Flood Advisory | BOU | Logan, Morgan, Washington | 63 hr |
| Jul 16, 9:37 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 35 min |
| Jul 17, 12:55 PM MDT | Areal Flood Advisory | BOU | Boulder, Grand, Larimer | 80 min |
| Jul 17, 2:20 PM MDT | Special Weather Statement | BOU | Gilpin | 25 min |
| Jul 17, 2:25 PM MDT | Severe Thunderstorm Warning | BOU | Gilpin | 35 min |
| Jul 17, 2:29 PM MDT | Areal Flood Advisory | BOU | Clear Creek, Gilpin | 91 min |
| Jul 17, 3:33 PM MDT | Special Weather Statement | BOU | Boulder | 27 min |
| Jul 17, 3:37 PM MDT | Areal Flood Advisory | BOU | Boulder | 83 min |
| Jul 17, 3:44 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 17, 3:59 PM MDT | Special Weather Statement | BOU | Boulder | 31 min |
| Jul 17, 4:16 PM MDT | Areal Flood Advisory | BOU | Boulder | 89 min |
| Jul 17, 4:31 PM MDT | Special Weather Statement | BOU | Boulder | 29 min |
| Jul 17, 4:57 PM MDT | Special Weather Statement | BOU | Boulder | 33 min |
| Jul 17, 5:01 PM MDT | Areal Flood Advisory | BOU | Boulder | 89 min |
| Jul 17, 5:25 PM MDT | Special Weather Statement | BOU | Boulder | 35 min |
Nearby
Flash Flood Warnings in Colorado, 2011Every flash flood warning in 2011
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.