Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 5, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jul 5, 2021, 6:50 PM MDT for Natrona County, Wyoming. It was in force for 40 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 5, 2021, 6:50 PM MDT (00:50 UTC)
- Expired
- Jul 5, 2021, 7:30 PM MDT
- In force
- 40 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Natrona County, WY
The radar
The Riverton/Lander radar (KRIW), 111 km from the middle of the area, began a volume at 00:48 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, 0.8 hours before the alert went out and 105 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3563 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 264 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
The text
As transmitted.
696
WUUS55 KRIW 060050
SVRRIW
WYC025-060130-
/O.NEW.KRIW.SV.W.0005.210706T0050Z-210706T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Riverton WY
650 PM MDT Mon Jul 5 2021
The National Weather Service in Riverton has issued a
* Severe Thunderstorm Warning for...
Southwestern Natrona County in central Wyoming...
* Until 730 PM MDT.
* At 650 PM MDT, severe thunderstorms were located along a line
extending from 6 miles west of Ervay to 13 miles northeast of Split
Rock to 6 miles north of Muddy Gap, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Severe thunderstorms will be near...
Ervay around 700 PM MDT.
Devil's Gate around 710 PM MDT.
Other locations in the path of these severe thunderstorms include
Independence Rock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4243 10695 4243 10754 4278 10754 4278 10750
4292 10750 4298 10699 4265 10687
TIME...MOT...LOC 0050Z 260DEG 27KT 4285 10749 4260 10738 4247 10743
HAIL...1.00IN
WIND...60MPH
$$
VandenBoogart2 follow-up statements
963
WWUS55 KRIW 060114
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
714 PM MDT Mon Jul 5 2021
WYC025-060130-
/O.CON.KRIW.SV.W.0005.000000T0000Z-210706T0130Z/
Natrona-
714 PM MDT Mon Jul 5 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MDT
FOR SOUTHWESTERN NATRONA COUNTY...
At 713 PM MDT, severe thunderstorms were located along a line
extending from near Ervay to 9 miles north of Independence Rock to
near Devil's Gate, moving east at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe thunderstorms will remain over mainly rural areas of
southwestern Natrona County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4243 10747 4261 10742 4278 10750 4285 10750
4293 10741 4298 10699 4265 10687 4243 10695
TIME...MOT...LOC 0113Z 260DEG 27KT 4288 10727 4263 10716 4250 10721
HAIL...0.75IN
WIND...60MPH
$$
VandenBoogart334
WWUS55 KRIW 060127
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
727 PM MDT Mon Jul 5 2021
WYC025-060136-
/O.EXP.KRIW.SV.W.0005.000000T0000Z-210706T0130Z/
Natrona-
727 PM MDT Mon Jul 5 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NATRONA COUNTY
WILL EXPIRE AT 730 PM MDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
LAT...LON 4243 10747 4261 10742 4278 10750 4285 10750
4293 10741 4298 10699 4265 10687 4243 10695
TIME...MOT...LOC 0126Z 260DEG 27KT 4290 10715 4265 10704 4252 10709
$$
VandenBoogartThe office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 6:34 PM MDT | Special Weather Statement | RIW | 26 min | |
| Jul 5, 7:01 PM MDT | Special Weather Statement | RIW | Natrona | 29 min |
| Jul 5, 7:35 PM MDT | Special Weather Statement | RIW | Natrona | 40 min |
| Jul 6, 1:38 PM MDT | Fire Weather Watch | RIW | Lincoln, Sublette, Sweetwater, Uinta | 24 hr |
| Jul 6, 5:04 PM MDT | Special Weather Statement | RIW | Hot Springs | 26 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2021Every severe thunderstorm warning 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.