Alert archive / Colorado / Flash Flood Warnings in 2017

Flash Flood Warning 8, NWS Denver/Boulder, CO

August 14, 2017Morgan County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Aug 14, 2017, 8:47 PM MDT for Morgan 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: Aug 14, 2017, 8:47 PM MDT (02:47 UTC)
Expired: Aug 14, 2017, 11:45 PM MDT
In force: 3 hr
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Flood severity: None

County Morgan County, CO

The radar

The Denver radar (KFTG), 89 km from the middle of the area, began a volume at 02:50 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
Aug 14, 9:07 PM MDT	FLASH FLOOD	Brush, CO

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, 2.8 hours before the alert went out and 56 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: 54 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 3288 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

871 
WGUS55 KBOU 150247
FFWBOU
COC087-150545-
/O.NEW.KBOU.FF.W.0008.170815T0247Z-170815T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
847 PM MDT MON AUG 14 2017

The National Weather Service in Denver Colorado has issued a

* Flash Flood Warning for...
  East central Morgan County in northeastern Colorado...

* Until 1145 PM MDT

* At 846 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain near Brush. The storms are moving east at 15 mph. Up to 
  two inches of rain have already fallen in the area between Fort 
  Morgan and Brush in the last hour. Flash flooding is expected to 
  begin shortly.

* Some locations that will experience flooding include...
  Brush.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, highways and underpasses. Additionally, country
roads and farmlands along the banks of creeks, streams and other low
lying areas are subject to flooding.

&&

LAT...LON 4021 10379 4035 10366 4027 10355 4014 10360

$$

GIMMESTAD

1 follow-up statement

817 
WGUS75 KBOU 150445
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
1045 PM MDT MON AUG 14 2017

COC087-150452-
/O.CAN.KBOU.FF.W.0008.000000T0000Z-170815T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morgan CO-
1045 PM MDT MON AUG 14 2017

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

The heavy rain has ended with only light rain showers lingering 
around Brush and East central Morgan county. Local Law Enforcement 
reported no flooding and all roads are now open. Flooding is no 
longer expected to pose a threat. 

LAT...LON 4021 10379 4035 10366 4027 10355 4014 10360

$$

ENTREKIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 7:53 PM MDT	Special Weather Statement	BOU	Morgan	52 min
Aug 14, 8:15 PM MDT	Areal Flood Advisory	BOU	Morgan	3 hr
Aug 14, 8:29 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Washington	61 min
Aug 14, 9:08 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	52 min
Aug 14, 10:02 PM MDT	Special Weather Statement	BOU	Washington	58 min
Aug 15, 4:01 PM MDT	Severe Thunderstorm Warning	BOU	Weld	44 min
Aug 15, 4:02 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas, Elbert	43 min
Aug 15, 4:08 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	52 min
Aug 15, 4:44 PM MDT	Severe Thunderstorm Warning	BOU	Weld	46 min
Aug 15, 4:53 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	37 min
Aug 15, 5:07 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	38 min
Aug 15, 5:12 PM MDT	Areal Flood Advisory	BOU	Douglas	3 hr
Aug 15, 5:27 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	53 min
Aug 15, 5:34 PM MDT	Areal Flood Advisory	BOU	Weld	116 min
Aug 15, 5:44 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	46 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.