Flash Flood Warning 9, NWS Cheyenne, WY

Issued

Jul 30, 2021, 3:33 PM MDT (21:33 UTC)

Expired

Jul 30, 2021, 6:30 PM MDT

In force

3 hr

Issued by

NWS Cheyenne, WY

Area

Storm-based polygon

Flood severity

None

Counties Albany County, WY, Carbon County, WY

The Cheyenne radar (KCYS), 116 km from the middle of the area, began a volume at 21:34 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.

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

713 
WGUS55 KCYS 302133
FFWCYS
WYC001-007-310030-
/O.NEW.KCYS.FF.W.0009.210730T2133Z-210731T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
333 PM MDT Fri Jul 30 2021

The National Weather Service in Cheyenne has issued a

* Flash Flood Warning for...
  The Mullen Fire Burn Scar Area in...
  Southeastern Carbon County in south central Wyoming...
  Southwestern Albany County in southeastern Wyoming...

* Until 630 PM MDT.

* At 333 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain over the Mullen Fire Burn Scar Area. Between 0.5 and 1 
  inch of rain has fallen. Additional rainfall amounts of 1 to 1.5 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Illinois Creek, Muddy Creek, Douglas Creek. The 
debris flow can consist of rock, mud, vegetation and other loose 
materials.

  HAZARD...Flash flooding caused by thunderstorms in and around
           the Mullen Fire Burn Scar Area.

  SOURCE...Radar.

  IMPACT...Flooding of areas in and around the Mullen Fire Burn
           Scar Area.

* Some locations that will experience flash flooding include...
  Albany, Bobbie Thompson Campground, Miller Lake Campground, Evans 
  Creek Campground, Lake Owen, Lake Owen Campground, Illinois Creek 
  Campground, Rob Roy Reservoir, Rob Roy Campground, Boswell Creek 
  Campground, Woods Landing-Jelm, Woods Landing and Centennial.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a life threatening situation. Heavy rainfall will cause 
extensive and severe flash flooding of creeks...streams...and 
ditches in the Mullen Fire Burn Scar Area. Severe debris flows can 
also be anticipated across roads. Roads and driveways may be washed 
away in places. If you encounter flood waters...climb to safety.

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 4118 10632 4119 10630 4128 10626 4128 10614
      4124 10611 4122 10606 4117 10604 4113 10599
      4110 10598 4100 10607 4100 10632 4100 10634
      4113 10644

FLASH FLOOD...RADAR INDICATED

$$

Brothers

466 
WGUS75 KCYS 302234
FFSCYS

Flash Flood Statement
National Weather Service Cheyenne WY
434 PM MDT Fri Jul 30 2021

WYC001-007-310030-
/O.CON.KCYS.FF.W.0009.000000T0000Z-210731T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Albany WY-Carbon WY-
434 PM MDT Fri Jul 30 2021

...FLASH FLOOD WARNING FOR THE MULLEN FIRE BURN SCAR AREA REMAINS IN 
EFFECT UNTIL 630 PM MDT THIS EVENING FOR SOUTHEASTERN CARBON AND 
SOUTHWESTERN ALBANY COUNTIES...

At 434 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain over the Mullen Fire Burn Scar Area over the past hour. Between 
1 and 1.75 inches of rain have fallen. Despite the heaviest rainfall 
ending, additional rainfall amounts up to 0.25 inches are possible 
in the warned area. Flash flooding is ongoing or expected to begin 
shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Illinois Creek, Muddy Creek, Douglas Creek. The 
debris flow can consist of rock, mud, vegetation and other loose 
materials.

HAZARD...Flash flooding caused by thunderstorms in and around the
         Mullen Fire Burn Scar Area.

SOURCE...Radar.

IMPACT...Flooding of areas in and around the Mullen Fire Burn
         Scar Area.

Some locations that will experience flash flooding include...
  Albany, Bobbie Thompson Campground, Miller Lake Campground, Evans 
  Creek Campground, Lake Owen, Lake Owen Campground, Illinois Creek 
  Campground, Rob Roy Reservoir, Rob Roy Campground, Boswell Creek 
  Campground, Woods Landing-Jelm, Woods Landing and Centennial.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a life threatening situation. Heavy rainfall will cause 
extensive and severe flash flooding of creeks...streams...and 
ditches in the Mullen Fire Burn Scar Area. Severe debris flows can 
also be anticipated across roads. Roads and driveways may be washed 
away in places. If you encounter flood waters...climb to safety.

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 4118 10632 4119 10630 4128 10626 4128 10614
      4124 10611 4122 10606 4117 10604 4113 10599
      4110 10598 4100 10607 4100 10632 4100 10634
      4113 10644

FLASH FLOOD...RADAR INDICATED

$$

Brothers

Flash Flood Warnings in Wyoming, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.