Alert archive / Kansas / Dense Fog Advisories in 2020

Dense Fog Advisory 21, NWS Goodland, KS

August 11, 2020Cheyenne County, Kansas; Yuma County, Colorado; Dundy County, Nebraska

NWS Goodland, KS issued this dense fog advisory at Aug 11, 2020, 8:05 AM CDT for Cheyenne County, Kansas; Yuma County, Colorado; Dundy County, Nebraska. It took effect at Aug 11, 2020, 9:00 AM CDT. It was in force for 42 min.

The area

The counties it named.

The facts

Issued: Aug 11, 2020, 8:05 AM CDT (13:05 UTC)
In effect from: Aug 11, 2020, 9:00 AM CDT
Expired: Aug 11, 2020, 9:42 AM CDT
In force: 42 min
Issued by: NWS Goodland, KS

Counties Yuma County, CO, Cheyenne County, KS, Dundy County, NE

The radar

The Goodland radar (KGLD), 72 km from the middle of the area, began a volume at 13:09 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 1.1 hours before the alert went out and 171 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: 1078 J/kg
Mixed-layer CIN: -402 J/kg
Mixed-layer LCL: 1120 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Goodland, KS wrote its last area forecast discussion before this dense fog advisory went out at Aug 11, 6:48 AM CDT, 1 hour 17 minutes earlier.

Area forecast discussion, Aug 11, 6:48 AM CDT, 1 hour 17 minutes before

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Hazardous weather outlook, Aug 11, 5:33 AM CDT, 2 hours 32 minutes before

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In the hours before

Special weather statement, Aug 11, 5:23 AM CDT, 2 hours 42 minutes before

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Local storm report, Aug 11, 7:30 AM CDT, 35 minutes before

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Local storm report, Aug 11, 7:33 AM CDT, 32 minutes before

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Local storm report, Aug 11, 8:04 AM CDT, 1 minute before

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The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 4:40 PM CDT	Severe Thunderstorm Warning	GLD	Cheyenne, Sherman	65 min
Aug 11, 5:38 PM CDT	Severe Thunderstorm Warning	GLD	Cheyenne, Sherman	97 min
Aug 11, 6:58 PM CDT	Severe Thunderstorm Warning	GLD	Logan, Sherman, Thomas, Wallace	76 min
Aug 11, 3:25 PM CDT	Special Weather Statement	GLD	Yuma	35 min
Aug 11, 3:43 PM CDT	Severe Thunderstorm Warning	GLD	Yuma	62 min
Aug 11, 4:20 PM CDT	Special Weather Statement	GLD	Yuma	25 min
Aug 11, 5:40 PM CDT	Special Weather Statement	GLD	Cheyenne	50 min

Nearby

Dense Fog Advisories in Kansas, 2020 Dense Fog Advisories in Colorado, 2020 Dense Fog Advisories in Nebraska, 2020 Every dense fog advisory in 2020

Sources

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.