Flash Flood Warning 111, NWS Salt Lake City, UT

Issued

Aug 18, 2021, 2:37 PM MDT (20:37 UTC)

Expired

Aug 18, 2021, 4:30 PM MDT

In force

113 min

Issued by

NWS Salt Lake City, UT

Area

Storm-based polygon

Damage threat

Considerable

Flood severity

None

County Utah County, UT

The Salt Lake City radar (KMTX), 146 km from the middle of the area, began a volume at 20:40 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.

796 
WGUS55 KSLC 182037
FFWSLC
UTC049-182230-
/O.NEW.KSLC.FF.W.0111.210818T2037Z-210818T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
237 PM MDT Wed Aug 18 2021

The National Weather Service in Salt Lake City has issued a

* Flash Flood Warning for...
  The Ether Hollow burn scar in...
  Eastern Utah County in northern Utah...

* Until 430 PM MDT.

* At 237 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain over the Ether Hollow Burn Scar. Flash flooding is 
  ongoing or expected to begin shortly.

Excessive rainfall over the burn scar will result in a debris flow. 
The debris flow can consist of rock, mud, vegetation and other loose 
materials.  This will impact areas below Ether Hollow including east 
bench area in Mapleton near Quiet Meadows Lane and near 1600 South 
1900 East.  Additionally, smaller flows are possible in Hobble Creek 
near Oak Loaf Lane and Maple Canyon near the Whiting Campground.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding in and around the Ether
           Hollow Burn Scar.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Ether Hollow Burn Scar.

* Some locations that will experience flash flooding include...
  Springville and Mapleton.

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 Ether Hollow Burn Scar. 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.

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry washes is likely. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

&&

LAT...LON 4015 11155 4015 11152 4013 11153 4013 11155
      4014 11156

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CRK

183 
WGUS75 KSLC 182127
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
327 PM MDT Wed Aug 18 2021

UTC049-182230-
/O.CON.KSLC.FF.W.0111.000000T0000Z-210818T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Utah UT-
327 PM MDT Wed Aug 18 2021

...FLASH FLOOD WARNING FOR THE ETHER HOLLOW BURN SCAR REMAINS IN 
EFFECT UNTIL 430 PM MDT THIS AFTERNOON FOR EASTERN UTAH COUNTY...

At 327 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain over the Ether Hollow Burn Scar. Flash flooding is ongoing or 
expected to begin shortly.  Additional heavy rainfall will move over 
the burn scar in the next hour.

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

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding in and around the Ether Hollow Burn Scar.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Ether Hollow Burn Scar.

Some locations that will experience flash flooding include...
  Springville and Mapleton.

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 Ether Hollow Burn Scar. 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.

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry washes is likely. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

&&

LAT...LON 4015 11155 4015 11152 4013 11153 4013 11155
      4014 11156

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CRK

512 
WGUS75 KSLC 182226
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
426 PM MDT Wed Aug 18 2021

UTC049-182236-
/O.EXP.KSLC.FF.W.0111.000000T0000Z-210818T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Utah UT-
426 PM MDT Wed Aug 18 2021

...FLASH FLOOD WARNING FOR THE ETHER HOLLOW BURN SCAR WILL EXPIRE AT 
430 PM MDT THIS AFTERNOON FOR EASTERN UTAH COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat.

A Flash Flood Watch remains in effect until 600 AM MDT Thursday for 
portions of central Utah, northern Utah and southern Utah.

LAT...LON 4015 11155 4015 11152 4013 11153 4013 11155
      4014 11156

$$

CRK

Flash Flood Warnings in Utah, 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.