Alert archive / Wyoming / Special Weather Statements in 2017
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Jul 7, 2017, 3:53 PM MDT for Laramie County, Wyoming. It was in force for 52 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 7, 2017, 3:53 PM MDT (21:53 UTC)
- Expired
- Jul 7, 2017, 4:45 PM MDT
- In force
- 52 min
- Issued by
- NWS Cheyenne, WY
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 28 km from the middle of the area, began a volume at 21:54 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 (KDEN), launched 12:00Z, 9.9 hours before the alert went out and 206 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2308 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -45 m²/s²
- 0-3 km storm-relative helicity
- -17 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 7, 2:20 PM MDT, 1 hour 33 minutes earlier.
Area forecast discussion, Jul 7, 2:20 PM MDT, 1 hour 33 minutes before
<!doctype html>
<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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</section>
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</html>Hazardous weather outlook, Jul 7, 6:04 AM MDT, 9 hours 49 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 604 AM MDT Fri Jul 7 2017 NEZ002-003-019>021-054-055-095-096-WYZ101>119-081215- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux-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-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- Central Laramie County-East Laramie County- 604 AM MDT Fri Jul 7 2017 This hazardous weather outlook is for portions of western Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Isolated to scattered showers and thunderstorms are expected across southeast Wyoming and the western Nebraska Panhandle this afternoon through early evening. The greatest coverage of storms is expected along and west of the Laramie Range in southeast Wyoming. A few storms may be strong to locally severe, containing strong winds and hail. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation is not anticipated.
In the hours before
Special weather statement, Jul 7, 3:50 PM MDT, 3 minutes before
Special Weather Statement National Weather Service Cheyenne WY 350 PM MDT FRI JUL 7 2017 WYZ115-116-072230- South Laramie Range WY-Laramie Valley WY- 350 PM MDT FRI JUL 7 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ALBANY COUNTY UNTIL 430 PM MDT... At 349 PM MDT, Doppler radar was tracking a strong thunderstorm over Tie City Campground, or 8 miles southeast of Laramie, moving south at 10 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Tie City Campground, Vedauwoo, Vedauwoo Campground, Yellow Pine Campground and The Buttes. This includes Interstate 80 in Wyoming between mile markers 319 and 332. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4127 10553 4131 10536 4114 10532 4112 10558 TIME...MOT...LOC 2149Z 356DEG 9KT 4124 10545 Cox
Special weather statement, Jul 7, 3:53 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Cheyenne WY 353 PM MDT FRI JUL 7 2017 WYZ116-117-072245- South Laramie Range WY-South Laramie Range Foothills WY- 353 PM MDT FRI JUL 7 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LARAMIE COUNTY UNTIL 445 PM MDT... At 352 PM MDT, Doppler radar was tracking a strong thunderstorm near Crystal Lake Campground, or 17 miles west of Cheyenne, moving east at 10 mph. Nickel size hail and wind gusts up to 50 mph will be possible with this storm. This storm will remain over mainly rural areas of southwestern Laramie County. This includes Interstate 80 in Wyoming between mile markers 342 and 352. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4100 10519 4112 10519 4114 10499 4100 10499 TIME...MOT...LOC 2152Z 266DEG 9KT 4109 10513 Cox
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 7:42 PM MDT | Special Weather Statement | CYS | 48 min | |
| Jul 6, 8:23 PM MDT | Special Weather Statement | CYS | Platte | 67 min |
| Jul 7, 3:50 PM MDT | Special Weather Statement | CYS | Albany | 40 min |
| Jul 7, 4:00 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 34 min |
| Jul 7, 4:27 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 31 min |
| Jul 7, 4:31 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 44 min |
| Jul 6, 8:12 PM MDT | Special Weather Statement | CYS | Kimball | 48 min |
| Jul 6, 9:54 PM MDT | Special Weather Statement | CYS | Box Butte, Dawes | 51 min |
| Jul 6, 10:15 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes | 30 min |
| Jul 6, 10:30 PM MDT | Special Weather Statement | CYS | Box Butte | 45 min |
Nearby
Special Weather Statements in Wyoming, 2017Every special weather statement in 2017
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.