Alert archive / Colorado / Flash Flood Warnings in 2014

Flash Flood Warning 41, NWS Denver/Boulder, CO

September 20, 2014Park County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Sep 20, 2014, 6:34 PM MDT for Park County, Colorado. It was in force for 116 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
Sep 20, 2014, 6:34 PM MDT (00:34 UTC)
Expired
Sep 20, 2014, 8:30 PM MDT
In force
116 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Flood severity
None

County Park County, CO

The radar

The Denver radar (KFTG), 116 km from the middle of the area, began a volume at 00:35 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 00:00Z, 0.6 hours before the alert went out and 212 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2014-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2014-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2340 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

438 
WGUS55 KBOU 210034
FFWBOU
COC093-210230-
/O.NEW.KBOU.FF.W.0041.140921T0034Z-140921T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
634 PM MDT SAT SEP 20 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL PARK COUNTY IN CENTRAL COLORADO...

* UNTIL 830 PM MDT
    
* AT 632 PM MDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  HEAVY RAIN CENTERED JUST WEST AND NORTHWEST OF LAKE GEORGE. THE 
  RAIN IS MOVING SOUTHEAST AT 5 MPH. UP TO THREE INCHES OF RAIN HAVE 
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF EAST CENTRAL 
  PARK COUNTY. 

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...LINK CREEK... 
ADAMANS CREEK.

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.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3897 10538 3892 10546 3903 10551 3905 10537

$$

BARJENBRUCH
2 follow-up statements
862 
WGUS75 KBOU 210131
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
731 PM MDT SAT SEP 20 2014

COC093-210230-
/O.CON.KBOU.FF.W.0041.000000T0000Z-140921T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PARK CO-
731 PM MDT SAT SEP 20 2014

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM MDT FOR
EAST CENTRAL PARK COUNTY...

AT 728 PM MDT...THE THUNDERSTORMS PRODUCING HEAVY RAIN NEAR THE LAKE 
GEORGE AREA HAD DECREASED.  THE RAIN WILL CONTINUE TO TAPER OFF 
BETWEEN NOW AND 830 PM.  UP TO THREE INCHES OF RAIN FELL IN A SMALL 
AREA JUST TO THE NORTHWEST OF LAKE GEORGE EARLIER THIS EVENING. 

FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF EAST CENTRAL
PARK COUNTY.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...LINK CREEK AND  
ADAMANS CREEK.

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.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3897 10538 3892 10546 3903 10551 3905 10537

$$

BARJENBRUCH
774 
WGUS75 KBOU 210235
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
835 PM MDT SAT SEP 20 2014

COC093-210244-
/O.EXP.KBOU.FF.W.0041.000000T0000Z-140921T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PARK CO-
835 PM MDT SAT SEP 20 2014

...THE FLASH FLOOD WARNING FOR EAST CENTRAL PARK COUNTY HAS
EXPIRED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT. PLEASE CONTINUE TO HEED ANY ROAD CLOSURES.

LAT...LON 3897 10538 3892 10546 3903 10551 3905 10537

$$

BARJENBRUCH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 6:06 PM MDTAreal Flood AdvisoryBOUPark114 min
Sep 21, 3:54 PM MDTAreal Flood AdvisoryBOULarimer2 hr

Nearby

Flash Flood Warnings in Colorado, 2014Every 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.