Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 5, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 5, 2011, 5:34 PM MDT for Grand County, Colorado. It was in force for 86 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 5, 2011, 5:34 PM MDT (23:34 UTC)
- Expired
- Jul 5, 2011, 7:00 PM MDT
- In force
- 86 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Grand County, CO
The radar
The Denver radar (KFTG), 111 km from the middle of the area, began a volume at 23:38 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, 11.6 hours before the alert went out and 222 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
- 45 J/kg
- Mixed-layer CIN
- -407 J/kg
- Mixed-layer LCL
- 1874 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- -34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
113 WGUS55 KBOU 052334 FFWBOU COC049-060100- /O.NEW.KBOU.FF.W.0005.110705T2334Z-110706T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 534 PM MDT TUE JUL 5 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHEASTERN GRAND COUNTY IN NORTH CENTRAL COLORADO * UNTIL 700 PM MDT * AT 531 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FROM A THUNDERSTORM 3 MILES SOUTHWEST OF FRASER... OR 48 MILES WEST OF DENVER. THIS STORM WAS MOVING EAST AT 10 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FRASER AND ALONG SAINT LOUIS CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING ESPECIALLY ALONG SAINT LOUIS CREEK...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN STEEP TERRAIN. && LAT...LON 3997 10578 3988 10577 3987 10590 3996 10592 $$
2 follow-up statements
770 WGUS75 KBOU 052357 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 557 PM MDT TUE JUL 5 2011 COC049-060100- /O.CON.KBOU.FF.W.0005.000000T0000Z-110706T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GRAND CO- 557 PM MDT TUE JUL 5 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR SOUTHEASTERN GRAND COUNTY... AT 555 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE HEAVY RAIN HAD ENDED ALONG SAINT LOUIS CREEK NEAR FRASER. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FRASER AND SAIT LOUIS CREEK. DOPPLER RADAR ESTIMATES THAT AROUND ONE HALF INCH OF RAIN MAY HAVE FALLEN ALONG SAINT LOUIS CREEK IN LESS THAN 45 MINUTES. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAIN WILL CAUSE FLASH FLOODING ALONG SAINT LOUIS CREEK...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN STEEP TERRAIN. && LAT...LON 3997 10578 3988 10577 3987 10590 3996 10592 $$
145 WGUS75 KBOU 060057 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 657 PM MDT TUE JUL 5 2011 COC049-060107- /O.EXP.KBOU.FF.W.0005.000000T0000Z-110706T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GRAND CO- 657 PM MDT TUE JUL 5 2011 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 700 PM MDT FOR SOUTHEASTERN GRAND COUNTY... THE STORM THAT PROMPTED THE WARNING HAS EXITED THE AREA. LAT...LON 3997 10578 3988 10577 3987 10590 3996 10592 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 3:15 AM MDT | Flash Flood Watch | BOU | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 12 more | 23 hr |
| Jul 5, 5:41 PM MDT | Special Weather Statement | BOU | Adams | 34 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.