Alert archive / Colorado / Flash Flood Warnings in 2017

Flash Flood Warning 4, NWS Denver/Boulder, CO

July 26, 2017Park County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 26, 2017, 8:09 PM MDT for Park County, Colorado. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 26, 2017, 8:09 PM MDT (02:09 UTC)
Expired: Jul 26, 2017, 11:15 PM MDT
In force: 3 hr
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Flood severity: None

County Park County, CO

The radar

The Denver radar (KFTG), 129 km from the middle of the area, began a volume at 02:13 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.

What was reported inside it

Time	Report	Where	Remark
Jul 26, 8:18 PM MDT	HEAVY RAIN 0.5	N Antero Reservoir, CO	0.5 INCHES IN 15 MINUTES

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 2.2 hours before the alert went out and 232 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: 479 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1416 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

911 
WGUS55 KBOU 270209
FFWBOU
COC093-270515-
/O.NEW.KBOU.FF.W.0004.170727T0209Z-170727T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
809 PM MDT WED JUL 26 2017

The National Weather Service in Denver Colorado has issued a

* Flash Flood Warning for...
  Central Park County in central Colorado...

* Until 1115 PM MDT

* At 808 PM MDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly.

* Some locations that will experience flooding include...
  Hartsel, Tarryall Reservoir and Antero Reservoir. 

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.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

&&

LAT...LON 3886 10559 3897 10588 3903 10601 3922 10587
      3928 10555 3919 10552

$$

MEIER

2 follow-up statements

425 
WGUS75 KBOU 270411
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
1011 PM MDT WED JUL 26 2017

COC093-270515-
/O.CON.KBOU.FF.W.0004.000000T0000Z-170727T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Park CO-
1011 PM MDT WED JUL 26 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MDT FOR
CENTRAL PARK COUNTY...

At 1009 PM MDT, Doppler radar indicated thunderstorms producing 
heavy rain were decreasing across the warned area.  Flash flooding 
may already be occurring in low lying areas along small creeks and 
streams. Some locations that will experience flooding include... 
Hartsel, Tarryall Reservoir and Antero Reservoir. Areas near 11 Mile 
Canyon Reservoir have also experienced very heavy rainfall. 

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.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

&&

LAT...LON 3886 10559 3897 10588 3903 10601 3922 10587
      3928 10555 3919 10552

$$

BARJENBRUCH

256 
WGUS75 KBOU 270510
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
1110 PM MDT WED JUL 26 2017

COC093-270519-
/O.EXP.KBOU.FF.W.0004.000000T0000Z-170727T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Park CO-
1110 PM MDT WED JUL 26 2017

...THE FLASH FLOOD WARNING FOR CENTRAL PARK COUNTY WILL EXPIRE AT
1115 PM MDT...

Rain and thunderstorm intensity is decreasing, and flooding is no 
longer expected to pose a threat. Please continue to heed any 
remaining road closures overnight.  Campers should also exercise 
caution, and not camp in low lying areas near elevated streams.

LAT...LON 3886 10559 3897 10588 3903 10601 3922 10587
      3928 10555 3919 10552

$$

BARJENBRUCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 6:26 PM MDT	Areal Flood Advisory	BOU	Douglas	2 hr
Jul 26, 6:34 PM MDT	Flash Flood Warning	BOU	Douglas	3 hr
Jul 26, 7:09 PM MDT	Flash Flood Warning	BOU	Douglas, Elbert, Jefferson	3 hr
Jul 26, 7:26 PM MDT	Areal Flood Advisory	BOU	Boulder	3 hr
Jul 26, 7:50 PM MDT	Areal Flood Advisory	BOU	Douglas, Jefferson, Park	115 min
Jul 26, 9:13 PM MDT	Areal Flood Advisory	BOU	Arapahoe, Denver	2 hr
Jul 26, 9:55 PM MDT	Areal Flood Advisory	BOU	Lincoln	2 hr
Jul 26, 11:22 PM MDT	Areal Flood Warning	BOU	Park	6 hr
Jul 26, 11:31 PM MDT	Areal Flood Advisory	BOU	Douglas, Elbert	3 hr
Jul 26, 11:48 PM MDT	River Flood Warning	BOU	Douglas	11 hr
Jul 27, 3:19 PM MDT	Areal Flood Advisory	BOU	Park	3 hr
Jul 27, 3:29 PM MDT	Special Weather Statement	BOU	Teller	31 min
Jul 27, 5:42 PM MDT	Special Weather Statement	BOU	Park	33 min

Nearby

Flash Flood Warnings in Colorado, 2017 Every flash flood warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.