Alert archive / Wyoming / Special Weather Statements in 2018
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jul 29, 2018, 1:25 PM MDT for Natrona County, Wyoming. It was in force for 50 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 29, 2018, 1:25 PM MDT (19:25 UTC)
- Expired
- Jul 29, 2018, 2:15 PM MDT
- In force
- 50 min
- Issued by
- NWS Riverton, WY
County Natrona County, WY
The radar
The Riverton/Lander radar (KRIW), 139 km from the middle of the area, began a volume at 19:28 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, 7.4 hours before the alert went out and 133 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
- 498 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 1073 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 415 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
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 Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Jul 29, 11:21 AM MDT, 2 hours 4 minutes earlier.
Area forecast discussion, Jul 29, 11:21 AM MDT, 2 hours 4 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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</html>Hazardous weather outlook, Jul 29, 2:03 AM MDT, 11 hours 22 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 203 AM MDT Sun Jul 29 2018 WYZ001>020-022>030-301100- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Big Horn Basin-Southwest Big Horn Basin- Southeast Big Horn Basin-Owl Creek and Bridger Mountains- Bighorn Mountains West-Bighorn Mountains Southeast- Northeast Johnson County-Southeast Johnson County- Teton and Gros Ventre Mountains-Jackson Hole- Wind River Mountains West-Wind River Mountains East- Upper Wind River Basin-Wind River Basin-Lander Foothills- Green Mountains and Rattlesnake Range- Natrona County Lower Elevations-Casper Mountain-Star Valley- Salt River and Wyoming Ranges-Upper Green River Basin Foothills- Upper Green River Basin-South Lincoln County- Rock Springs and Green River-Flaming Gorge-East Sweetwater County- 203 AM MDT Sun Jul 29 2018 A Red Flag Warning is in effect for Sweetwater, Uinta, and Southern Lincoln Counties today. This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Scattered thunderstorms, especially along and east of the Continental Divide. Some of these storms will likely produce small hail, locally heavy rainfall, frequent lightning, and strong gusty winds. There will be a few strong thunderstorms and even isolated severe thunderstorms are possible. Low relative humidity, very warm temperatures, and dry thunderstorms producing strong wind gusts in southwest Wyoming will create erratic fire behavior today. .DAYS TWO THROUGH SEVEN...Monday through Saturday Tuesday through Thursday...Isolated afternoon and evening thunderstorms, mainly over and near the northwest mountains. Thursday and Friday...Warm and dry conditions with gusty west wind will elevated fire weather conditions across southern Wyoming during the afternoon and early evening. .SPOTTER INFORMATION STATEMENT... Spotters urged to report wind gusts past 45 mph, hail size, and rainfall amounts. Thank you.
In the hours before
Special weather statement, Jul 29, 12:53 PM MDT, 32 minutes before
Special Weather Statement National Weather Service Riverton WY 1253 PM MDT SUN JUL 29 2018 WYZ007-017-291930- Owl Creek and Bridger Mountains-Wind River Basin- 1253 PM MDT SUN JUL 29 2018 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FREMONT COUNTY UNTIL 130 PM MDT... At 1253 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles north of Pavillion, moving south at 25 mph. Dime size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Pavillion around 110 PM MDT. Kinnear and Ocean Lake around 130 PM MDT. Other locations impacted by this storm include Midvale and Pavillion Natural Gas Processing Plant. LAT...LON 4349 10889 4353 10859 4321 10818 4305 10881 TIME...MOT...LOC 1853Z 338DEG 20KT 4336 10868 Hattings
Special weather statement, Jul 29, 1:25 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Riverton WY 125 PM MDT SUN JUL 29 2018 WYZ020-292015- Natrona County Lower Elevations- 125 PM MDT SUN JUL 29 2018 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL NATRONA COUNTY UNTIL 215 PM MDT... At 125 PM MDT, Doppler radar was tracking a strong thunderstorm over Goldeneye Reservoir, or 25 miles northwest of Casper, moving southeast at 25 mph. Penny size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Emigrant Gap and Natrona County Airport around 200 PM MDT. Other locations impacted by this storm include Natrona and Casper Natrona County Airport. 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 4308 10699 4319 10675 4289 10636 4271 10675 TIME...MOT...LOC 1925Z 326DEG 25KT 4303 10675 Hattings
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 6:09 PM MDT | Special Weather Statement | RIW | 36 min | |
| Jul 28, 6:16 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 33 min |
| Jul 28, 6:29 PM MDT | Special Weather Statement | RIW | Sheridan | 31 min |
| Jul 28, 6:42 PM MDT | Special Weather Statement | RIW | Big Horn | 33 min |
| Jul 28, 7:00 PM MDT | Special Weather Statement | RIW | Park | 30 min |
| Jul 28, 7:13 PM MDT | Special Weather Statement | RIW | 32 min | |
| Jul 28, 7:14 PM MDT | Special Weather Statement | RIW | Teton | 31 min |
| Jul 28, 7:16 PM MDT | Special Weather Statement | RIW | 29 min | |
| Jul 28, 7:49 PM MDT | Special Weather Statement | RIW | 26 min | |
| Jul 28, 8:10 PM MDT | Special Weather Statement | RIW | Teton | 35 min |
| Jul 28, 8:23 PM MDT | Special Weather Statement | RIW | Park | 37 min |
| Jul 28, 9:08 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 37 min |
| Jul 29, 12:53 PM MDT | Special Weather Statement | RIW | Fremont | 37 min |
| Jul 29, 1:34 PM MDT | Special Weather Statement | RIW | Fremont | 41 min |
| Jul 29, 1:57 PM MDT | Special Weather Statement | RIW | Johnson | 48 min |
| Jul 29, 2:02 PM MDT | Special Weather Statement | RIW | Natrona | 43 min |
| Jul 29, 2:21 PM MDT | Special Weather Statement | RIW | 39 min | |
| Jul 29, 2:34 PM MDT | Special Weather Statement | RIW | Johnson | 41 min |
| Jul 29, 2:35 PM MDT | Special Weather Statement | RIW | Johnson | 40 min |
| Jul 29, 2:54 PM MDT | Special Weather Statement | RIW | 36 min | |
| Jul 29, 3:25 PM MDT | Special Weather Statement | RIW | 50 min | |
| Jul 29, 3:31 PM MDT | Special Weather Statement | RIW | Fremont | 44 min |
| Jul 29, 3:35 PM MDT | Special Weather Statement | RIW | 25 min | |
| Jul 29, 3:38 PM MDT | Special Weather Statement | RIW | Natrona | 37 min |
| Jul 29, 3:42 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Sweetwater | 28 min |
| Jul 29, 3:58 PM MDT | Special Weather Statement | RIW | Fremont | 32 min |
| Jul 29, 4:04 PM MDT | Special Weather Statement | RIW | Hot Springs | 26 min |
| Jul 29, 4:11 PM MDT | Special Weather Statement | RIW | 34 min | |
| Jul 29, 4:30 PM MDT | Special Weather Statement | RIW | 30 min | |
| Jul 29, 4:43 PM MDT | Special Weather Statement | RIW | Hot Springs | 32 min |
| Jul 29, 4:44 PM MDT | Special Weather Statement | RIW | Hot Springs | 31 min |
| Jul 29, 5:05 PM MDT | Special Weather Statement | RIW | Hot Springs | 25 min |
| Jul 29, 5:15 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 45 min |
| Jul 29, 5:22 PM MDT | Special Weather Statement | RIW | 23 min | |
| Jul 29, 5:35 PM MDT | Special Weather Statement | RIW | Natrona | 40 min |
| Jul 29, 5:50 PM MDT | Special Weather Statement | RIW | Hot Springs | 25 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.