Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 30, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 18, 2011, 7:25 PM MDT for Summit County, Colorado. It was in force for 95 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 18, 2011, 7:25 PM MDT (01:25 UTC)
- Expired
- Jul 18, 2011, 9:00 PM MDT
- In force
- 95 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Summit County, CO
The radar
The Denver radar (KFTG), 134 km from the middle of the area, began a volume at 01:27 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
Grand Junction, CO (KGJT), launched 00:00Z, 1.4 hours before the alert went out and 214 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
- 11 J/kg
- Mixed-layer CIN
- -245 J/kg
- Mixed-layer LCL
- 2727 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
673 WGUS55 KBOU 190125 FFWBOU COC117-190300- /O.NEW.KBOU.FF.W.0030.110719T0125Z-110719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 725 PM MDT MON JUL 18 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL SUMMIT COUNTY IN CENTRAL COLORADO * UNTIL 900 PM MDT * AT 723 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 2 MILES SOUTH OF BLUE RIVER... OR 61 MILES WEST OF DENVER. THIS STORM WAS MOVING NORTHWEST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BRECKENRIDGE AND BLUE RIVER. TRAINED WEATHER SPOTTERS REPORT NEARLY 2 INCHES OF RAIN HAS FALLEN IN THE LAST HOUR AT BRECKENRIDGE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS AND STREAMS ESPECIALLY ALONG THE BLUE RIVER...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 3953 10612 3959 10601 3942 10597 3938 10608 $$
2 follow-up statements
985 WGUS75 KBOU 190149 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 749 PM MDT MON JUL 18 2011 COC117-190300- /O.CON.KBOU.FF.W.0030.000000T0000Z-110719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUMMIT CO- 749 PM MDT MON JUL 18 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM MDT FOR SOUTH CENTRAL SUMMIT COUNTY... AT 746 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED MODERATE TO HEAVY RAIN CONTINUING NEAR BRECKENRIDGE...OR ABOUT 63 MILES WEST OF DENVER. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BRECKENRIDGE AND BLUE RIVER. TRAINED WEATHER SPOTTERS REPORT 2.60 INCHES OF RAIN HAS FALLEN IN THE LAST HOUR IN BRECKENRIDGE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING ALONG THE BLUE RIVER...CREEKS AND STREAMS ESPECIALLY SAWMILL...CUCUMBER AND ALONG FRENCH GULCH...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN STEEP TERRAIN. IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS... OR CREEKS...WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS. && LAT...LON 3953 10612 3959 10601 3942 10597 3938 10608 $$
662 WGUS75 KBOU 190223 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 823 PM MDT MON JUL 18 2011 COC117-190300- /O.CON.KBOU.FF.W.0030.000000T0000Z-110719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUMMIT CO- 823 PM MDT MON JUL 18 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM MDT FOR SOUTH CENTRAL SUMMIT COUNTY... AT 817 PM MDT...FLASH FLOODING WAS OCCURRING IN AND NEAR NEAR BRECKENRIDGE...OR ABOUT 60 MILES WEST OF DENVER. ROCK SLIDES HAVE ALSO OCCURRED SOUTHEAST OF BRECKENRIDGE. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BRECKENRIDGE AND BLUE RIVER. TRAINED WEATHER SPOTTERS REPORT NEARLY 3 INCHES OF RAIN HAS OCCURRED IN AND NEAR BRECKENRIDGE IN THE LAST 90 MINUTES. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING ALONG THE BLUE RIVER...CREEKS AND STREAMS ESPECIALLY SAWMILL...CUCUMBER AND ALONG FRENCH GULCH...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS WILL ALSO TRIGGER ROCK SLIDES AND 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 3953 10612 3959 10601 3942 10597 3938 10608 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 6:08 PM MDT | Flash Flood Warning | BOU | Larimer | 2 hr |
| Jul 18, 6:57 PM MDT | Areal Flood Advisory | BOU | Summit | 93 min |
| Jul 18, 7:29 PM MDT | Areal Flood Advisory | BOU | Summit | 91 min |
| Jul 18, 8:30 PM MDT | Areal Flood Advisory | BOU | Park | 2 hr |
| Jul 18, 8:52 PM MDT | Flash Flood Warning | BOU | Summit | 113 min |
| Jul 18, 9:28 PM MDT | Areal Flood Advisory | BOU | Grand | 24 hr |
| Jul 18, 10:52 PM MDT | Areal Flood Advisory | BOU | Summit | 20 hr |
| Jul 19, 11:13 AM MDT | Flash Flood Watch | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 9 hr |
| Jul 19, 2:53 PM MDT | Special Weather Statement | BOU | Gilpin | 37 min |
| Jul 19, 3:27 PM MDT | Flash Flood Warning | BOU | Boulder | 2 hr |
| Jul 19, 4:19 PM MDT | Special Weather Statement | BOU | Broomfield | 26 min |
| Jul 19, 4:21 PM MDT | Areal Flood Advisory | BOU | Clear Creek, Gilpin, Jefferson, Park | 95 min |
| Jul 19, 4:58 PM MDT | Special Weather Statement | BOU | Broomfield | 32 min |
| Jul 19, 5:09 PM MDT | Special Weather Statement | BOU | Larimer | 36 min |
| Jul 19, 5:11 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 49 min |
| Jul 19, 5:37 PM MDT | Special Weather Statement | BOU | Denver | 23 min |
| Jul 19, 5:59 PM MDT | Special Weather Statement | BOU | Denver | 31 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.