Alert archive / Nebraska / Special Weather Statements in 2021
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Jul 17, 2021, 4:20 PM MDT for Sioux County, Nebraska. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2021, 4:20 PM MDT (22:20 UTC)
- Expired
- Jul 17, 2021, 5:00 PM MDT
- In force
- 40 min
- Issued by
- NWS Cheyenne, WY
County Sioux County, NE
The radar
The Cheyenne radar (KCYS), 151 km from the middle of the area, began a volume at 22:21 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
Rapid City, SD (KUNR), launched 12:00Z, 10.3 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
- 16 J/kg
- Mixed-layer CIN
- -381 J/kg
- Mixed-layer LCL
- 2689 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -64 m²/s²
- 0-3 km storm-relative helicity
- -37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Jul 17, 3:03 PM MDT, 1 hour 17 minutes earlier.
Area forecast discussion, Jul 17, 3:03 PM MDT, 1 hour 17 minutes before
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<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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</html>Hazardous weather outlook, Jul 17, 3:07 PM MDT, 1 hour 13 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 307 PM MDT Sat Jul 17 2021 NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-118-119- 181300- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- Converse County Lower Elevations-Niobrara County- East Platte County-Goshen County-Central Laramie County- East Laramie County- 307 PM MDT Sat Jul 17 2021 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Scattered showers and thunderstorms are expected to develop along the Laramie Range this afternoon, spreading eastward across the western Nebraska Panhandle through this evening. A few strong to severe thunderstorms are possible, with large hail and damaging winds the primary hazard. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY An isolated shower or thunderstorm will be possible each afternoon over the next week. Widespread severe weather is not expected. .Spotter information statement... Spotter activation is not anticipated. WYZ103>106-109>117-181300- North Laramie Range-Ferris/Seminoe/Shirley Mountains- Shirley Basin-Central Laramie Range and Southwest Platte County- Central Carbon County-North Snowy Range Foothills- Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range-Laramie Valley- South Laramie Range-South Laramie Range Foothills- 307 PM MDT Sat Jul 17 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Isolated showers and thunderstorms are expected this afternoon and evening. Severe weather is not expected. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY An isolated shower or thunderstorm will be possible each afternoon over the next week. Widespread severe weather is not expected. .Spotter information statement... Spotter activation will not be needed.
In the hours before
Special weather statement, Jul 17, 4:20 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Cheyenne WY 420 PM MDT Sat Jul 17 2021 NEZ095-096-WYZ108-172300- North Sioux NE-South Sioux NE-Goshen County WY- 420 PM MDT Sat Jul 17 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SIOUX AND NORTHEASTERN GOSHEN COUNTIES UNTIL 500 PM MDT... At 419 PM MDT, Doppler radar was tracking a strong thunderstorm 8 miles southeast of Prairie Center, or 25 miles north of Torrington, moving southeast at 50 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Agate Bed National Monument. LAT...LON 4238 10423 4254 10411 4232 10345 4208 10360 TIME...MOT...LOC 2219Z 297DEG 45KT 4243 10408 Mokry
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:25 PM MDT | Special Weather Statement | CYS | Niobrara | 35 min |
| Jul 16, 6:59 PM MDT | Special Weather Statement | CYS | Dawes | 31 min |
| Jul 16, 7:10 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 35 min |
| Jul 16, 7:33 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes | 42 min |
| Jul 16, 9:31 PM MDT | Special Weather Statement | CYS | Box Butte | 44 min |
| Jul 17, 4:59 PM MDT | Special Weather Statement | CYS | Sioux | 31 min |
| Jul 17, 5:03 PM MDT | Special Weather Statement | CYS | Kimball | 27 min |
| Jul 17, 5:29 PM MDT | Special Weather Statement | CYS | Kimball | 31 min |
Nearby
Special Weather Statements in Nebraska, 2021Every special weather statement 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.