Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Aug 15, 2021, 1:03 PM MDT for Platte County, Wyoming. It was in force for 42 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
- Aug 15, 2021, 1:03 PM MDT (19:03 UTC)
- Expired
- Aug 15, 2021, 1:45 PM MDT
- In force
- 42 min
- Issued by
- NWS Cheyenne, WY
- Hail
- 0.50 in
- Wind
- 30
County Platte County, WY
The radar
The Cheyenne radar (KCYS), 134 km from the middle of the area, began a volume at 19:03 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
Riverton, WY (KRIW), launched 12:00Z, 7.1 hours before the alert went out and 249 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2705 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 46 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 Aug 15, 11:25 AM MDT, 1 hour 38 minutes earlier.
Area forecast discussion, Aug 15, 11:25 AM MDT, 1 hour 38 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, Aug 15, 10:58 AM MDT, 2 hours 5 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 1058 AM MDT Sun Aug 15 2021 NEZ002-019-020-054-095-096-WYZ109-111>114-118-119-161200- Dawes County-Scotts Bluff County-Banner County-Kimball County- Northern Sioux County-Southern Sioux County-Central Carbon County- Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range-Central Laramie County- East Laramie County- 1058 AM MDT Sun Aug 15 2021 This hazardous weather outlook is for portions of panhandle Nebraska...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Isolated to scattered thunderstorms are expected this afternoon and evening. A few of the thunderstorms could be strong, producing small hail and gusty winds. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY Thunderstorm chances will exist most every afternoon and evening, with the greatest chances on Wednesday, when scattered to numerous thunderstorms will prevail. .Spotter information statement... Spotters are encouraged to report any severe or significant weather to the National Weather Service in Cheyenne. WYZ101>108-110-115>117-161200- 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-North Snowy Range Foothills- Laramie Valley-South Laramie Range-South Laramie Range Foothills- 1058 AM MDT Sun Aug 15 2021 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Poor air quality expected from 1 PM today through 1 PM MDT Monday. Those sensitive to poor air quality should plan and limit their outdoor time accordingly. Isolated to scattered thunderstorms are expected this afternoon and evening. A few of the thunderstorms could be strong, producing small hail and gusty winds. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY Thunderstorm chances will exist most every afternoon and evening, with the greatest chances on Wednesday, when scattered to numerous thunderstorms will prevail. .Spotter information statement... Spotters are encouraged to report any severe or significant weather to the National Weather Service in Cheyenne. NEZ003-021-055-161200- Box Butte County-Morrill County-Cheyenne County- 1058 AM MDT Sun Aug 15 2021 This hazardous weather outlook is for portions of panhandle Nebraska. .DAY ONE...TODAY AND TONIGHT Isolated to scattered thunderstorms are expected this afternoon and evening. A few of the thunderstorms could be strong to severe, producing one inch hail and gusty winds. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY Thunderstorm chances will exist most every afternoon and evening, with the greatest chances on Wednesday, when scattered to numerous thunderstorms will prevail. .Spotter information statement... Spotters are encouraged to report any severe or significant weather to the National Weather Service in Cheyenne.
In the hours before
Special weather statement, Aug 15, 1:03 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
103 PM MDT Sun Aug 15 2021
WYZ103-105-151945-
Shirley Basin WY-North Laramie Range WY-
103 PM MDT Sun Aug 15 2021
...A strong thunderstorm will impact portions of northeastern Albany
and south central Converse Counties through 145 PM MDT...
At 103 PM MDT, Doppler radar was tracking a strong thunderstorm near
Windy Peak, or 37 miles south of Douglas, moving northeast at 10 mph.
HAZARD...Winds in excess of 30 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Friend Park Campground, Windy Peak, Laramie Peak, Garrett and Curtis
Gulch Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.
&&
LAT...LON 4205 10550 4210 10587 4242 10578 4238 10532
TIME...MOT...LOC 1903Z 205DEG 8KT 4225 10565
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH
MokryThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 7:01 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 44 min |
| Aug 14, 7:12 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 48 min |
| Aug 14, 7:36 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 39 min |
| Aug 15, 12:42 PM MDT | Areal Flood Advisory | CYS | Albany, Carbon | 3 hr |
| Aug 15, 1:06 PM MDT | Areal Flood Advisory | CYS | Albany | 3 hr |
| Aug 15, 1:42 PM MDT | Areal Flood Advisory | CYS | Albany, Carbon, Converse | 2 hr |
| Aug 15, 2:10 PM MDT | Special Weather Statement | CYS | Albany | 35 min |
| Aug 15, 2:21 PM MDT | Special Weather Statement | CYS | Albany | 24 min |
| Aug 15, 3:47 PM MDT | Special Weather Statement | CYS | Albany | 28 min |
| Aug 15, 3:49 PM MDT | Special Weather Statement | CYS | Albany | 26 min |
| Aug 15, 4:25 PM MDT | Special Weather Statement | CYS | Albany | 50 min |
| Aug 15, 4:46 PM MDT | Flash Flood Warning | CYS | Albany | 95 min |
| Aug 14, 6:21 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Morrill | 39 min |
| Aug 14, 6:29 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 46 min |
| Aug 14, 7:09 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 34 min |
| Aug 14, 7:34 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Kimball, Morrill | 41 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.