Flash Flood Warning 70, NWS Denver/Boulder, CO

Issued

Aug 13, 2021, 5:39 PM MDT (23:39 UTC)

Expired

Aug 13, 2021, 7:49 PM MDT

In force

2 hr

Issued by

NWS Denver/Boulder, CO

Area

Storm-based polygon

Flood severity

None

County Grand County, CO

The Cheyenne radar (KCYS), 138 km from the middle of the area, began a volume at 23:40 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.

324 
WGUS55 KBOU 132339
FFWBOU
COC049-140245-
/O.NEW.KBOU.FF.W.0070.210813T2339Z-210814T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
539 PM MDT Fri Aug 13 2021

The National Weather Service in Denver has issued a

* Flash Flood Warning for...
  North Central Grand County in north central Colorado...

* Until 845 PM MDT.

* At 539 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 0.4 inches of rain have 
  fallen. Additional rainfall amounts of 0.2 to 0.4 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...
  northern portions of the East Troublesome burn area in North 
  Central Grand County

Highway 125 in far northern Grand County, Trout Creek, and upper 
reaches of Willow 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 East Troublesome burn area. Rock slides or debris 
flows can also be expected across rural roads.

&&

LAT...LON 4037 10604 4035 10602 4032 10603 4031 10603
      4034 10598 4034 10593 4032 10593 4030 10590
      4026 10595 4025 10606 4033 10614 4034 10612
      4035 10609 4035 10608 4036 10605

FLASH FLOOD...RADAR INDICATED

$$

Barjenbruch

145 
WGUS75 KBOU 140047
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
647 PM MDT Fri Aug 13 2021

COC049-140245-
/O.CON.KBOU.FF.W.0070.000000T0000Z-210814T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grand CO-
647 PM MDT Fri Aug 13 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MDT THIS 
EVENING FOR THE NORTH CENTRAL PORTIONS OF THE EAST TROUBLESOME FIRE 
IN NORTH CENTRAL GRAND COUNTY...

At 647 PM MDT, Doppler radar indicated that thunderstorms had moved 
out of the warned area. Up to 0.6 inches of rain had fallen, with 
the heaviest amounts in the far upper reaches of Trout Creek.

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...
  northern portions of the East Troublesome burn area in North 
  Central Grand County, including Highway 125, Trout Creek, and 
  upper reaches of Willow 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 East Troublesome burn area. Rock slides or debris 
flows can also be expected across rural roads.

&&

LAT...LON 4037 10604 4035 10602 4032 10603 4031 10603
      4034 10598 4034 10593 4032 10593 4030 10590
      4026 10595 4025 10606 4033 10614 4034 10612
      4035 10609 4035 10608 4036 10605

FLASH FLOOD...RADAR INDICATED

$$

Barjenbruch

434 
WGUS75 KBOU 140149
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
749 PM MDT Fri Aug 13 2021

COC049-140159-
/O.CAN.KBOU.FF.W.0070.000000T0000Z-210814T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grand CO-
749 PM MDT Fri Aug 13 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTH CENTRAL GRAND COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed any road closures.

LAT...LON 4037 10604 4035 10602 4032 10603 4031 10603
      4034 10598 4034 10593 4032 10593 4030 10590
      4026 10595 4025 10606 4033 10614 4034 10612
      4035 10609 4035 10608 4036 10605

$$

Barjenbruch

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.