Alert archive / Wyoming / Flash Flood Watches in 2018
Flash Flood Watch 4, NWS Riverton, WY
NWS Riverton, WY issued this flash flood watch at Jul 16, 2018, 2:14 PM MDT for Johnson County, Natrona County, Washakie County, Wyoming. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2018, 2:14 PM MDT (20:14 UTC)
- Expired
- Jul 16, 2018, 11:26 PM MDT
- In force
- 9 hr
- Issued by
- NWS Riverton, WY
- Flood severity
- None
Counties Johnson County, WY, Natrona County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 134 km from the middle of the area, began a volume at 20:14 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, 8.2 hours before the alert went out and 128 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
- 36 J/kg
- Mixed-layer CIN
- -282 J/kg
- Mixed-layer LCL
- 1825 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 16, 12:10 PM MDT, 2 hours 4 minutes earlier.
Area forecast discussion, Jul 16, 12:10 PM MDT, 2 hours 4 minutes before
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</html>Hazardous weather outlook, Jul 16, 2:22 AM MDT, 11 hours 52 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 222 AM MDT Mon Jul 16 2018 WYZ001>020-022>030-171200- 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- 222 AM MDT Mon Jul 16 2018 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Scattered thunderstorms will develop this afternoon and evening. Some could become strong to severe in northern and central Wyoming with large hail and damaging winds. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Tuesday...Isolated to locally scattered thunderstorms; especially in the northern half of the state. Saturday and Sunday...Isolated thunderstorms, mainly in the afternoon and evening hours. .SPOTTER INFORMATION STATEMENT... Spotters are urged to report hail, wind gusts over 45 mph and heavy rainfall. Thank you. Team Riverton
In the hours before
Special weather statement, Jul 16, 8:35 AM MDT, 5 hours 39 minutes before
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</html>Special weather statement, Jul 16, 12:22 PM MDT, 1 hour 52 minutes before
Special Weather Statement National Weather Service Riverton WY 1222 PM MDT MON JUL 16 2018 WYZ002>007-161900- Owl Creek and Bridger Mountains-North Big Horn Basin-Southeast Big Horn Basin-Cody Foothills-Southwest Big Horn Basin-Absaroka Mountains- 1222 PM MDT MON JUL 16 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HOT SPRINGS... SOUTHWESTERN BIG HORN...NORTHWESTERN WASHAKIE AND SOUTHEASTERN PARK COUNTIES UNTIL 100 PM MDT... At 1221 PM MDT, Doppler radar was tracking a strong thunderstorm 11 miles south of Meeteetse, moving east at 35 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. This storm will remain over mainly rural areas of northwestern Hot Springs...southwestern Big Horn...northwestern Washakie and southeastern Park Counties, including the following locations... Badlands Overlook, Sunshine Reservoir and Grass Creek. 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. && LAT...LON 4388 10910 4430 10911 4441 10845 4383 10837 TIME...MOT...LOC 1821Z 250DEG 32KT 4399 10894 Baker
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 6:11 PM MDT | Special Weather Statement | RIW | Johnson | 34 min |
| Jul 15, 6:41 PM MDT | Special Weather Statement | RIW | Johnson | 49 min |
| Jul 15, 6:54 PM MDT | Special Weather Statement | RIW | Johnson | 36 min |
| Jul 15, 7:00 PM MDT | Special Weather Statement | RIW | Johnson | 45 min |
| Jul 15, 7:31 PM MDT | Special Weather Statement | RIW | Johnson | 29 min |
| Jul 16, 8:35 AM MDT | Special Weather Statement | RIW | Natrona | 25 min |
| Jul 16, 12:22 PM MDT | Special Weather Statement | RIW | Hot Springs | 38 min |
| Jul 16, 1:52 PM MDT | Areal Flood Advisory | RIW | Johnson, Natrona | 4 hr |
| Jul 16, 3:02 PM MDT | Special Weather Statement | RIW | Natrona | 43 min |
| Jul 16, 3:33 PM MDT | Special Weather Statement | RIW | Natrona | 42 min |
| Jul 16, 3:48 PM MDT | Areal Flood Advisory | RIW | Johnson | 4 hr |
| Jul 16, 4:09 PM MDT | Special Weather Statement | RIW | Natrona | 36 min |
| Jul 16, 4:17 PM MDT | Special Weather Statement | RIW | Natrona | 43 min |
| Jul 16, 4:52 PM MDT | Special Weather Statement | RIW | Natrona | 38 min |
| Jul 16, 5:02 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 43 min |
| Jul 16, 5:32 PM MDT | Special Weather Statement | RIW | Natrona | 28 min |
Nearby
Flash Flood Watches in Wyoming, 2018Every flash flood watch 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.