Alert archive / Wyoming / Special Weather Statements in 2018
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Jul 21, 2018, 5:31 PM MDT for Niobrara County, Wyoming. It was in force for 44 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 21, 2018, 5:31 PM MDT (23:31 UTC)
- Expired
- Jul 21, 2018, 6:15 PM MDT
- In force
- 44 min
- Issued by
- NWS Cheyenne, WY
County Niobrara County, WY
The radar
The Rapid City radar (KUDX), 169 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 382 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
- 2923 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- -3 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 21, 5:24 PM MDT, 7 minutes earlier.
Area forecast discussion, Jul 21, 5:24 PM MDT, 7 minutes before
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</html>Hazardous weather outlook, Jul 21, 2:45 PM MDT, 2 hours 46 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 245 PM MDT Sat Jul 21 2018 NEZ002-003-019>021-054-095-096-WYZ101>103-106>108-119-222045- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-North Sioux- South Sioux-Converse County Lower Elevations-Niobrara County- North Laramie Range- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-East Laramie County- 245 PM MDT Sat Jul 21 2018 This hazardous weather outlook is for portions of western Nebraska...east central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Isolated to widely scattered afternoon and evening thunderstorms expected. A few storms may become strong to severe producing large hail and damaging wind gusts. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Isolated to scattered mainly afternoon and evening thunderstorms will occur each day. Severe weather is not expected at this time. Locally heavy rain, gusty winds and small hail will be possible with the stronger storms. .Spotter information statement... Spotter activation may be required until 9 PM. NEZ055-WYZ104-105-109>118-222045- Cheyenne-Ferris/Seminoe/Shirley Mountains-Shirley Basin- 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- 245 PM MDT Sat Jul 21 2018 This hazardous weather outlook is for portions of western Nebraska...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Isolated to scattered afternoon and evening thunderstorms will develop. Severe weather is not expected at this time. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Isolated to scattered mainly afternoon and evening thunderstorms will occur each day. Severe weather is not expected at this time. Locally heavy rain, gusty winds and small hail will be possible with the stronger storms. .Spotter information statement... Spotter activation will not be required.
In the hours before
Special weather statement, Jul 21, 3:25 PM MDT, 2 hours 6 minutes before
Special Weather Statement National Weather Service Cheyenne WY 325 PM MDT SAT JUL 21 2018 WYZ117>119-212200- Central Laramie County WY-South Laramie Range Foothills WY- East Laramie County WY- 325 PM MDT SAT JUL 21 2018 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL LARAMIE COUNTY UNTIL 400 PM MDT... At 324 PM MDT, Doppler radar was tracking a strong thunderstorm near South Greeley, or 9 miles south of Cheyenne, moving east at 10 mph. Dime size hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Fox Farm-College. 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. 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 4112 10478 4109 10445 4100 10449 4100 10483 TIME...MOT...LOC 2124Z 287DEG 9KT 4102 10473 Hammer
Special weather statement, Jul 21, 3:39 PM MDT, 1 hour 52 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
339 PM MDT SAT JUL 21 2018
WYZ116>118-212230-
South Laramie Range WY-Central Laramie County WY-
South Laramie Range Foothills WY-
339 PM MDT SAT JUL 21 2018
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LARAMIE COUNTY UNTIL
430 PM MDT...
At 339 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles southwest of Warren AFB, or 11 miles southwest of Cheyenne,
moving east at 20 mph.
Half inch hail and winds in excess of 40 mph will be possible with
this storm, along with frequent lightning.
Locations impacted include...
Cheyenne, South Greeley, Ranchettes, Warren AFB, Frontier Park, North
Cheyenne, Crystal Lake Reservoir, Warren Af Base, Crystal Lake
Campground, Fox Farm-College and South Greeley High.
This includes the following highways...
Interstate 25 in Wyoming between mile markers 1 and 19.
Interstate 80 in Wyoming between mile markers 340 and 371.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
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 4114 10523 4121 10513 4130 10462 4100 10465
4100 10523
TIME...MOT...LOC 2139Z 271DEG 19KT 4108 10499
HammerLocal storm report, Jul 21, 3:51 PM MDT, 1 hour 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
351 PM MDT SAT JUL 21 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0350 PM HAIL CHEYENNE 41.15N 104.79W
07/21/2018 M0.25 INCH LARAMIE WY OFFICIAL NWS OBS
&&
WMOKRYSpecial weather statement, Jul 21, 4:52 PM MDT, 39 minutes before
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</html>Local storm report, Jul 21, 5:29 PM MDT, 2 minutes before
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</html>Special weather statement, Jul 21, 5:31 PM MDT, 0 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 3:25 PM MDT | Special Weather Statement | CYS | Laramie | 35 min |
| Jul 21, 3:39 PM MDT | Special Weather Statement | CYS | Laramie | 51 min |
| Jul 21, 3:55 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 38 min |
| Jul 21, 4:17 PM MDT | Flash Flood Warning | CYS | Laramie | 3 hr |
| Jul 21, 4:52 PM MDT | Special Weather Statement | CYS | Niobrara | 38 min |
| Jul 21, 5:37 PM MDT | Special Weather Statement | CYS | Platte | 38 min |
Nearby
Special Weather Statements in Wyoming, 2018Every special weather statement in 2018
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.