Alert archive / Wyoming / Special Weather Statements in 2017
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Aug 1, 2017, 6:21 PM MDT for Johnson County, Wyoming. It was in force for 39 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 1, 2017, 6:21 PM MDT (00:21 UTC)
- Expired
- Aug 1, 2017, 7:00 PM MDT
- In force
- 39 min
- Issued by
- NWS Riverton, WY
County Johnson County, WY
The radar
The Riverton/Lander radar (KRIW), 191 km from the middle of the area, began a volume at 00:21 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 00:00Z, 0.4 hours before the alert went out and 187 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
- 342 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 3526 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 287 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted.
011 WWUS85 KRIW 020021 SPSRIW Special Weather Statement National Weather Service Riverton WY 621 PM MDT TUE AUG 1 2017 WYZ009>011-020100- Southeast Johnson County-Bighorn Mountains Southeast-Northeast Johnson County- 621 PM MDT TUE AUG 1 2017 ...SPECIAL WEATHER STATEMENT... At 618 PM MDT, Doppler radar was tracking a strong thunderstorm near Saddlestring, which is 12 miles west of Buffalo, moving southeast at 25 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Occasional cloud to ground lightning and locally heavy rainfall is also expected with this storm. This strong thunderstorm will be near... Buffalo around 650 PM MDT. Other locations impacted by this storm include Buffalo Golf Course, Middle Fork Campground, Johnson County Fairgrounds, Tie Hack Campground, Indian Campground. This includes the following highways... Interstate 25 between mile markers 285 and 299. Interstate 90 between mile markers 60 and 70. PRECAUTIONARY/PREPAREDNESS ACTIONS... Occasional 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 4441 10705 4448 10699 4428 10646 4406 10676 TIME...MOT...LOC 0018Z 315DEG 20KT 4440 10696 $$ Lipson
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 6:33 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 20 min |
| Aug 1, 6:57 PM MDT | Special Weather Statement | RIW | Johnson | 33 min |
Nearby
Special Weather Statements in Wyoming, 2017Every special weather statement in 2017
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.