Flash Flood Warning 55, NWS Denver/Boulder, CO

Issued

Jul 31, 2021, 11:49 AM MDT (17:49 UTC)

Expired

Jul 31, 2021, 1:51 PM MDT

In force

2 hr

Issued by

NWS Denver/Boulder, CO

Area

Storm-based polygon

Flood severity

None

County Larimer County, CO

The Cheyenne radar (KCYS), 90 km from the middle of the area, began a volume at 17:51 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.

231 
WGUS55 KBOU 311749
FFWBOU
COC069-312100-
/O.NEW.KBOU.FF.W.0055.210731T1749Z-210731T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
1149 AM MDT Sat Jul 31 2021

The National Weather Service in Denver has issued a

* Flash Flood Warning for...
  Northwestern Larimer County in north central Colorado...

* Until 300 PM MDT.

* At 1149 AM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 0.4 inches of rain have 
  fallen. Additional rainfall amounts up to 0.5 inches are possible 
  in the warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, gulches,
           roads, and poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Kinikinik.

This includes the following additional locations...
	Bellaire Lake.

This includes the following streams and drainages...
  Peterson Creek, Sheep Creek, Cache La Poudre River, Laramie River, 
  Manhattan Creek, Elkhorn Creek, Dry Creek, Brinker Creek, Roaring 
  Creek, Killpecker Creek and South Lone Pine Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

Heavy Rainfall will cause flash flooding of small creeks, streams, 
and ditches in the affected part of the Cameron Peak burn area. Rock 
slides or debris flows can also be expected across rural roads.

&&

LAT...LON 4077 10576 4078 10560 4068 10562 4065 10577
      4072 10582 4077 10577

FLASH FLOOD...RADAR INDICATED

$$

RPK

001 
WGUS75 KBOU 311854
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
1254 PM MDT Sat Jul 31 2021

COC069-312100-
/O.CON.KBOU.FF.W.0055.000000T0000Z-210731T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Larimer CO-
1254 PM MDT Sat Jul 31 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 3 PM MDT THIS 
AFTERNOON FOR NORTHWESTERN LARIMER COUNTY...

At 1254 PM MDT, Doppler radar indicated moderate rain across the 
warned area. Up to 0.8 inches of rain have fallen. Additional 
rainfall amounts up to 0.25 inch are possible in the warned area. 
Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, gulches,
         roads, and poor drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Kinikinik.

This includes the following additional locations...
	Bellaire Lake.

This includes the following streams and drainages...
  Peterson Creek, Sheep Creek, Cache La Poudre River, Laramie River, 
  Manhattan Creek, Elkhorn Creek, Dry Creek, Brinker Creek, Roaring 
  Creek, Killpecker Creek and South Lone Pine Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

Heavy Rainfall will cause flash flooding of small creeks, streams, 
and ditches in the affected part of the Cameron Peak burn area. Rock 
slides or debris flows can also be expected across rural roads.

&&

LAT...LON 4077 10576 4078 10560 4068 10562 4065 10577
      4072 10582 4077 10577

FLASH FLOOD...RADAR INDICATED

$$

RPK

592 
WGUS75 KBOU 311951
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
151 PM MDT Sat Jul 31 2021

COC069-312001-
/O.CAN.KBOU.FF.W.0055.000000T0000Z-210731T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Larimer CO-
151 PM MDT Sat Jul 31 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN LARIMER 
COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

A Flash Flood Watch remains in effect until 900 PM MDT Saturday for 
Portions of central and north central Colorado.

LAT...LON 4077 10576 4078 10560 4068 10562 4065 10577
      4072 10582 4077 10577

$$

RPK

Flash Flood Warnings in Colorado, 2021Every flash flood warning in 2021

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.