Alert archive / Nebraska / Special Weather Statements in 2021
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Aug 19, 2021, 3:18 PM MDT for Cheyenne County, Nebraska. It was in force for 27 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 19, 2021, 3:18 PM MDT (21:18 UTC)
- Expired
- Aug 19, 2021, 3:45 PM MDT
- In force
- 27 min
- Issued by
- NWS Cheyenne, WY
- Hail
- 0.75 in
- Wind
- 50
County Cheyenne County, NE
The radar
The Cheyenne radar (KCYS), 143 km from the middle of the area, began a volume at 21:19 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, 9.3 hours before the alert went out and 171 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
- 246 J/kg
- Mixed-layer CIN
- -241 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 19, 2:38 PM MDT, 40 minutes earlier.
Area forecast discussion, Aug 19, 2:38 PM MDT, 40 minutes before
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<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.
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<p id="message2">
Please try again in a few minutes.
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</html>Hazardous weather outlook, Aug 19, 5:40 AM MDT, 9 hours 38 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 540 AM MDT Thu Aug 19 2021 NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-116>119- 201145- 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- North Laramie Range- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-South Laramie Range- South Laramie Range Foothills-Central Laramie County- East Laramie County- 540 AM MDT Thu Aug 19 2021 This hazardous weather outlook is for the western Nebraska panhandle...east central Wyoming and far southeast Wyoming along and east of Interstate 25. .DAY ONE...TODAY AND TONIGHT Showers and thunderstorms will redevelop late this morning and early this afternoon and quickly move northeast across the area as a Pacific storm system drifts east over the area. Some of these thunderstorms will become severe today with several rounds of thunderstorms possible into late this evening. Severe thunderstorms may contain strong winds, very heavy rainfall which may result in flash flooding, and large hail. Please monitor the latest forecasts for additional statements or severe weather watches this afternoon. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY Much cooler temperatures are expected behind the surface cold front Friday and Saturday. .Spotter information statement... Spotter activation is possible this afternoon and this evening. WYZ104-105-109-111>115-201145- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Carbon County-Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range-Laramie Valley- 540 AM MDT Thu Aug 19 2021 This hazardous weather outlook is for portions of south central Wyoming, mainly west of Interstate 25. .DAY ONE...TODAY AND TONIGHT Showers and thunderstorms will continue to redevelop this morning and quickly move northeast across the area as a Pacific storm system drifts east over the area. Some of these thunderstorms may become strong today with several rounds of thunderstorms possible into late this evening. In addition, some light snowfall is possible across the higher peaks of the Snowy Range and Sierra Madre Range tonight and early Friday morning as the colder air arrives behind the cold front. Any snow accumulations should be minimal and confined to areas above 10,000 feet. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY Much cooler temperatures are expected behind the surface cold front Friday and Saturday. Strong gusty winds are expected Friday morning across the wind prone areas. .Spotter information statement... Spotter activation is unlikely, but spotters are urged to alert the National Weather Service of any strong winds and hail. WYZ110-201145- North Snowy Range Foothills- 540 AM MDT Thu Aug 19 2021 This hazardous weather outlook is for portions of south central Wyoming. .DAY ONE...TODAY AND TONIGHT Showers and thunderstorms will continue to redevelop this morning and quickly move northeast across the area as a Pacific storm system drifts east over the area. Some of these thunderstorms may become strong today with several rounds of thunderstorms possible into late this evening. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY Locally strong west winds are forecast for the Arlington and Elk Mountain areas as the storm system pushes east of the region. West winds of 35 to 45 mph with gusts up to 65 mph are possible Friday morning. Winds are expected to diminish slightly in the afternoon. .Spotter information statement... Spotter activation is unlikely, but spotters are urged to alert the National Weather Service of any strong winds and hail.
In the hours before
Special weather statement, Aug 19, 10:00 AM MDT, 5 hours 18 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
1000 AM MDT Thu Aug 19 2021
WYZ101-102-191645-
Converse County Lower Elevations WY-Niobrara County WY-
1000 AM MDT Thu Aug 19 2021
...Strong thunderstorms will impact portions of northwestern Niobrara
and northeastern Converse Counties through 1045 AM MDT...
At 959 AM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from Bill to 13 miles west of Keeline. Movement was
north at 30 mph.
HAZARD...Wind gusts up to 50 mph and pea size 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...
Bill, Dull Center, Manning Ranch and Lance Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4299 10471 4265 10507 4325 10549 4350 10541
4350 10483
TIME...MOT...LOC 1559Z 181DEG 27KT 4322 10527 4277 10502
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
HammerSpecial weather statement, Aug 19, 1:35 PM MDT, 1 hour 43 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
135 PM MDT Thu Aug 19 2021
NEZ055-192000-
Cheyenne NE-
135 PM MDT Thu Aug 19 2021
...A strong thunderstorm will impact portions of central Cheyenne
County through 200 PM MDT...
At 135 PM MDT, Doppler radar was tracking a strong thunderstorm near
Lorenzo, or 11 miles southwest of Sidney, moving north at 35 mph.
HAZARD...Winds in excess of 40 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...
Sidney, Gurley, Brownson, Sidney Airport and Lorenzo.
This includes Interstate 80 in Nebraska between mile markers 44 and
59.
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.
A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
the Panhandle of Nebraska.
&&
LAT...LON 4140 10320 4134 10285 4100 10300 4100 10326
4101 10326
TIME...MOT...LOC 1935Z 193DEG 32KT 4103 10314
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
HammerSpecial weather statement, Aug 19, 2:06 PM MDT, 1 hour 12 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
206 PM MDT Thu Aug 19 2021
NEZ055-192030-
Cheyenne NE-
206 PM MDT Thu Aug 19 2021
...A strong thunderstorm will impact portions of central Cheyenne
County through 230 PM MDT...
At 206 PM MDT, Doppler radar was tracking a strong thunderstorm near
Sidney Airport, or near Sidney, moving northeast at 20 mph.
HAZARD...Wind gusts up to 50 mph and nickel size 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...
Sidney, Gurley, Colton, Brownson and Sidney Airport.
This includes Interstate 80 in Nebraska between mile markers 49 and
64.
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.
A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
the Panhandle of Nebraska.
&&
LAT...LON 4101 10298 4110 10318 4139 10304 4125 10273
TIME...MOT...LOC 2006Z 210DEG 16KT 4113 10304
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
HammerSpecial weather statement, Aug 19, 2:34 PM MDT, 44 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
234 PM MDT Thu Aug 19 2021
NEZ055-192100-
Cheyenne NE-
234 PM MDT Thu Aug 19 2021
...Strong thunderstorms will impact portions of eastern Cheyenne
County through 300 PM MDT...
At 234 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Gurley to 8 miles northwest of Twin
Buttes. Movement was north at 35 mph.
HAZARD...Wind gusts up to 50 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...
Sidney, Lodgepole, Gurley, Colton, Sunol, Brownson, Lorenzo and
Sidney Airport.
This includes Interstate 80 in Nebraska between mile markers 51 and
77.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.
A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
the Panhandle of Nebraska.
&&
LAT...LON 4100 10262 4101 10316 4107 10319 4143 10292
4143 10264 4140 10263 4139 10261
TIME...MOT...LOC 2034Z 200DEG 29KT 4133 10293 4102 10285
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
HammerSpecial weather statement, Aug 19, 3:18 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
318 PM MDT Thu Aug 19 2021
NEZ021-055-192145-
Cheyenne NE-Morrill NE-
318 PM MDT Thu Aug 19 2021
...A strong thunderstorm will impact portions of northwestern
Cheyenne and southwestern Morrill Counties through 345 PM MDT...
At 317 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Gurley, or 18 miles northwest of Sidney, moving north
at 25 mph.
HAZARD...Wind gusts up to 50 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This storm will remain over mainly rural areas of northwestern
Cheyenne and southwestern Morrill Counties.
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.
A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
the Panhandle of Nebraska.
&&
LAT...LON 4129 10308 4129 10322 4159 10329 4159 10295
TIME...MOT...LOC 2117Z 182DEG 24KT 4137 10316
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
BrothersThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 6:34 PM MDT | Special Weather Statement | CYS | Laramie | 26 min |
| Aug 18, 7:41 PM MDT | Special Weather Statement | CYS | Goshen | 34 min |
| Aug 18, 9:49 PM MDT | Special Weather Statement | CYS | Goshen | 41 min |
| Aug 19, 2:10 AM MDT | High Wind Warning | CYS | Albany, Carbon, Laramie | 34 hr |
| Aug 19, 10:00 AM MDT | Special Weather Statement | CYS | Converse | 45 min |
| Aug 18, 6:46 PM MDT | Special Weather Statement | CYS | Dawes | 29 min |
| Aug 18, 7:06 PM MDT | Areal Flood Advisory | CYS | Dawes | 4 hr |
| Aug 18, 7:10 PM MDT | Special Weather Statement | CYS | Scotts Bluff | 35 min |
| Aug 18, 7:16 PM MDT | Special Weather Statement | CYS | Sioux | 29 min |
| Aug 18, 9:17 PM MDT | Special Weather Statement | CYS | Sioux | 43 min |
| Aug 19, 1:35 PM MDT | Special Weather Statement | CYS | Cheyenne | 25 min |
| Aug 19, 2:06 PM MDT | Special Weather Statement | CYS | Cheyenne | 24 min |
| Aug 19, 2:34 PM MDT | Special Weather Statement | CYS | Cheyenne | 26 min |
| Aug 19, 4:28 PM MDT | Areal Flood Advisory | CYS | Cheyenne | 2 hr |
| Aug 19, 4:37 PM MDT | Special Weather Statement | CYS | Box Butte | 38 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.