Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Jul 9, 2021, 1:58 PM MDT for Laramie County, Wyoming. It was in force for 32 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 9, 2021, 1:58 PM MDT (19:58 UTC)
- Expired
- Jul 9, 2021, 2:30 PM MDT
- In force
- 32 min
- Issued by
- NWS Cheyenne, WY
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 23 km from the middle of the area, began a volume at 20:02 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 12:00Z, 8.0 hours before the alert went out and 176 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
- 5 J/kg
- Mixed-layer CIN
- -346 J/kg
- Mixed-layer LCL
- 3383 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 50 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 9, 11:50 AM MDT, 2 hours 8 minutes earlier.
Area forecast discussion, Jul 9, 11:50 AM MDT, 2 hours 8 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 9, 1:42 PM MDT, 16 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 142 PM MDT Fri Jul 9 2021 NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-119-101945- 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-East Laramie County- 142 PM MDT Fri Jul 9 2021 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT SPC has issued a Marginal to Slight Risk for severe thunderstorms. Scattered to numerous showers and thunderstorms this afternoon into overnight hours with some thunderstorms being strong to severe with gusty, erratic winds, large hail, and heavy rainfall. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Scattered showers and thunderstorms possible on Tuesday through Thursday. .Spotter information statement... Spotter activation may be needed. Spotters are encouraged to issue all reports to the National Weather Service Cheyenne office. WYZ105-111-112-114-115-101945- Shirley Basin-Southwest Carbon County-Sierra Madre Range- Snowy Range-Laramie Valley- 142 PM MDT Fri Jul 9 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Elevated fire weather concerns through the afternoon for low humidity and gusty winds. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed. WYZ104-109-110-113-101945- Ferris/Seminoe/Shirley Mountains-Central Carbon County- North Snowy Range Foothills-Upper North Platte River Basin- 142 PM MDT Fri Jul 9 2021 This hazardous weather outlook is for portions of south central Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Red Flag Warning in effect through 8 PM MDT today for gusty winds and low humidity. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed. WYZ103-106-116>118-101945- North Laramie Range- Central Laramie Range and Southwest Platte County- South Laramie Range-South Laramie Range Foothills- Central Laramie County- 142 PM MDT Fri Jul 9 2021 This hazardous weather outlook is for portions of southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Isolated to scattered showers and thunderstorms this afternoon. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Scattered showers and thunderstorms possible on Tuesday through Thursday. .Spotter information statement... Spotter activation will not be needed.
In the hours before
Special weather statement, Jul 9, 1:31 PM MDT, 27 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
131 PM MDT Fri Jul 9 2021
WYZ117>119-092000-
Central Laramie County WY-South Laramie Range Foothills WY-
East Laramie County WY-
131 PM MDT Fri Jul 9 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LARAMIE COUNTY UNTIL
200 PM MDT...
At 130 PM MDT, Doppler radar was tracking a strong thunderstorm near
Warren AFB, or 9 miles west of Cheyenne, moving east at 40 mph.
Half inch hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Cheyenne, South Greeley, Hillsdale, Ranchettes, Warren AFB, Frontier
Park, North Cheyenne, Warren Af Base, Fox Farm-College and South
Greeley High.
This includes the following highways...
Interstate 25 in Wyoming between mile markers 2 and 18.
Interstate 80 in Wyoming between mile markers 348 and 380.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.
&&
LAT...LON 4109 10508 4126 10505 4125 10444 4100 10451
4100 10483
TIME...MOT...LOC 1930Z 277DEG 35KT 4117 10497
HammerSpecial weather statement, Jul 9, 1:58 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
158 PM MDT Fri Jul 9 2021
WYZ117>119-092030-
Central Laramie County WY-South Laramie Range Foothills WY-
East Laramie County WY-
158 PM MDT Fri Jul 9 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LARAMIE COUNTY UNTIL
230 PM MDT...
At 158 PM MDT, Doppler radar was tracking a strong thunderstorm near
Cheyenne, moving east at 35 mph.
Half inch hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Cheyenne, Burns, Hillsdale, Carpenter, Ranchettes and Fox
Farm-College.
This includes Interstate 80 in Wyoming between mile markers 364 and
395.
LAT...LON 4105 10478 4123 10475 4124 10416 4100 10420
4100 10461
TIME...MOT...LOC 1958Z 277DEG 30KT 4114 10466
HammerThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 1:31 PM MDT | Special Weather Statement | CYS | Laramie | 29 min |
| Jul 9, 2:20 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 40 min |
| Jul 9, 2:29 PM MDT | Special Weather Statement | CYS | Laramie | 31 min |
| Jul 9, 2:51 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 39 min |
| Jul 9, 2:58 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill | 47 min |
| Jul 9, 3:32 PM MDT | Special Weather Statement | CYS | Sioux | 28 min |
| Jul 9, 3:37 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Kimball | 42 min |
| Jul 9, 3:54 PM MDT | Severe Thunderstorm Warning | CYS | Dawes, Sioux | 36 min |
| Jul 9, 4:30 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes, Sioux | 45 min |
| Jul 9, 5:08 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes | 52 min |
| Jul 9, 5:42 PM MDT | Tornado Warning | CYS | Box Butte | 33 min |
| Jul 9, 5:49 PM MDT | Areal Flood Advisory | CYS | Box Butte, Morrill | 3 hr |
| Jul 9, 5:58 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Morrill | 47 min |
Nearby
Special Weather Statements in Wyoming, 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.