Alert archive / Wyoming / Dense Fog Advisories in 2021
Dense Fog Advisory 7, NWS Cheyenne, WY
NWS Cheyenne, WY issued this dense fog advisory at May 18, 2021, 4:32 AM MDT for Albany County, Laramie County, Wyoming; Kimball County, Nebraska. It was in force for 89 min.
The area
The counties it named.
The facts
- Issued
- May 18, 2021, 4:32 AM MDT (10:32 UTC)
- Expired
- May 18, 2021, 6:01 AM MDT
- In force
- 89 min
- Issued by
- NWS Cheyenne, WY
Counties Kimball County, NE, Albany County, WY, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 27 km from the middle of the area, began a volume at 10:34 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.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 10.5 hours before the alert went out and 210 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.
- Mixed-layer CAPE
- 63 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 1614 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Cheyenne, WY wrote its last area forecast discussion before this dense fog advisory went out at May 17, 5:27 PM MDT, 11 hours 5 minutes earlier.
Area forecast discussion, May 17, 5:27 PM MDT, 11 hours 5 minutes before
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</html>Hazardous weather outlook, May 17, 2:48 PM MDT, 13 hours 44 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 248 PM MDT Mon May 17 2021 WYZ114-182100- Snowy Range- 248 PM MDT Mon May 17 2021 This hazardous weather outlook is for portions of south central Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT A flash flood warning is in effect across the burn scar with a couple of brief downpours still possible this afternoon and early evening. As a result, there will be a continued threat for flooding across the burn scar through tonight. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY There is still a threat for a few showers and thunderstorms on Tuesday and Wednesday over the burn scar. However, these showers and storms will be brief with limited flood threat. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-095-096-WYZ101>108-182100- Dawes County-Box Butte County-Northern Sioux County- Southern Sioux County-Converse County Lower Elevations- Niobrara County-North Laramie Range- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County- 248 PM MDT Mon May 17 2021 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT A few thunderstorms will be possible this afternoon and early this evening. The main threat will be brief heavy downpours and small hail. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A few isolated thunderstorms cannot be ruled out on Tuesday and Wednesday, but no severe weather is expected at this time. .Spotter information statement... Spotter activation will not be needed. NEZ019>021-054-055-WYZ109>113-115>119-182100- Scotts Bluff County-Banner County-Morrill County-Kimball County- Cheyenne County-Central Carbon County-North Snowy Range Foothills- Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Laramie Valley-South Laramie Range- South Laramie Range Foothills-Central Laramie County- East Laramie County- 248 PM MDT Mon May 17 2021 This hazardous weather outlook is for portions of panhandle Nebraska...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Scattered thunderstorms will also be possible this afternoon and this evening. These thunderstorms may produce some brief downpours along with small hail. Otherwise, no severe weather is expected at this time. Areas of dense fog are possible tonight into tomorrow morning on the I-80 summit and foothills, with visibility dropping below one quarter of a mile at times. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY Areas of dense fog are possible tonight into tomorrow morning on the I-80 summit and foothills, with visibility dropping below one quarter of a mile at times. A few thunderstorms may also develop on Tuesday and Wednesday afternoon/evening, but no severe weather is expected at this time. .Spotter information statement... Spotter activation will not be needed.
Nearby
Dense Fog Advisories in Wyoming, 2021Dense Fog Advisories in Nebraska, 2021Every dense fog advisory in 2021
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.