Alert archive / Colorado / Flash Flood Warnings in 2014

Flash Flood Warning 39, NWS Denver/Boulder, CO

August 26, 2014Larimer County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Aug 26, 2014, 4:08 PM MDT for Larimer County, Colorado. It was in force for 2 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: Aug 26, 2014, 4:08 PM MDT (22:08 UTC)
Expired: Aug 26, 2014, 6:30 PM MDT
In force: 2 hr
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Flood severity: None

County Larimer County, CO

The radar

The Cheyenne radar (KCYS), 74 km from the middle of the area, began a volume at 22:08 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 (KDEN), launched 12:00Z, 10.1 hours before the alert went out and 199 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 164 J/kg
Mixed-layer CIN: -158 J/kg
Mixed-layer LCL: 835 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

502 
WGUS55 KBOU 262208
FFWBOU
COC069-270030-
/O.NEW.KBOU.FF.W.0039.140826T2208Z-140827T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
408 PM MDT TUE AUG 26 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL LARIMER COUNTY IN NORTH CENTRAL COLORADO...

* UNTIL 630 PM MDT
    
* AT 407 PM MDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN NEAR MISHAWAKA. THE RAIN IS MOVING NORTHEAST AT 20 MPH.
  FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BUCKHORN MOUNTAIN...POUDRE PARK...MISHAWAKA AND TEDS PLACE. 

* RAINFALL RATES UP TO ONE INCH PER HALF HOUR ARE POSSIBLE OVER THE 
  WESTERN HALF OF THE HIGH PARK BURN AREA WITH THIS STORM.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...STREAMS...ROADS
AND CULVERTS IN THE HIGH PARK BURN AREA. SOME AREAS AFFECTED INCLUDE
RIST CANYON...BUCKHORN CREEK...REDSTONE CANYON...STOVE PRAIRIE...AND
GULCHES DRAINING INTO THE POUDRE CANYON ALONG HIGHWAY 14.  ROCK
SLIDES OR DEBRIS FLOWS CAN ALSO BE EXPECTED ACROSS ROADS IN THE BURN
AREA.

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 4056 10535 4056 10549 4065 10557 4072 10544
      4076 10525 4065 10518 4057 10518

$$

RJK

2 follow-up statements

412 
WGUS75 KBOU 262314
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
514 PM MDT TUE AUG 26 2014

COC069-270030-
/O.CON.KBOU.FF.W.0039.000000T0000Z-140827T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
514 PM MDT TUE AUG 26 2014

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR
EAST CENTRAL LARIMER COUNTY...

AT 512 PM MDT...MOST OF THE RAINFALL HAS ENDED OVER THE HIGH PARK 
BURN AREA.  SOME LIGHT RAIN IS EXPECTED TO MOVE INTO THE WARNING 
AREA BY 5:30 PM MDT.

SOME LOCATIONS IN THE WARNING AREA INCLUDE BUCKHORN 
MOUNTAIN...POUDRE PARK...MISHAWAKA AND TEDS PLACE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...STREAMS...ROADS
AND CULVERTS IN THE HIGH PARK BURN AREA. SOME AREAS AFFECTED INCLUDE
RIST CANYON...BUCKHORN CREEK...REDSTONE CANYON...STOVE PRAIRIE...AND
GULCHES DRAINING INTO THE POUDRE CANYON ALONG HIGHWAY 14.  ROCK
SLIDES OR DEBRIS FLOWS CAN ALSO BE EXPECTED ACROSS ROADS IN THE BURN
AREA.

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 4056 10535 4056 10549 4065 10557 4072 10544
      4076 10525 4065 10518 4057 10518

$$

RJK

211 
WGUS75 KBOU 262352
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
552 PM MDT TUE AUG 26 2014

COC069-270002-
/O.CAN.KBOU.FF.W.0039.000000T0000Z-140827T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
552 PM MDT TUE AUG 26 2014

...THE FLASH FLOOD WARNING FOR EAST CENTRAL LARIMER COUNTY IS
CANCELLED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.  THERE WER NO REPORTS OF FLOODING.  

LAT...LON 4056 10535 4056 10549 4065 10557 4072 10544
      4076 10525 4065 10518 4057 10518

$$

RJK

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 25, 8:10 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	33 min
Aug 26, 1:11 AM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver	94 min
Aug 26, 5:47 AM MDT	Flash Flood Watch	BOU	Adams, Arapahoe, Douglas, Elbert, Lincoln, Washington	15 hr
Aug 26, 2:11 PM MDT	Severe Thunderstorm Warning	BOU	Jefferson	18 min
Aug 26, 2:30 PM MDT	Areal Flood Advisory	BOU	Denver, Jefferson	2 hr

Nearby

Flash Flood Warnings in Colorado, 2014 Every flash flood warning in 2014

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.