Alert archive / Wyoming / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 21, NWS Riverton, WY

June 17, 2016Johnson County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 17, 2016, 7:50 PM MDT for Johnson County, Wyoming. It was in force for 55 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: Jun 17, 2016, 7:50 PM MDT (01:50 UTC)
Expired: Jun 17, 2016, 8:45 PM MDT
In force: 55 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 184 km from the middle of the area, began a volume at 01:50 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, 1.8 hours before the alert went out and 179 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 380 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 2903 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

618 
WUUS55 KRIW 180150
SVRRIW
WYC019-180245-
/O.NEW.KRIW.SV.W.0021.160618T0150Z-160618T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
750 PM MDT FRI JUN 17 2016

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN JOHNSON COUNTY IN WYOMING...

* UNTIL 845 PM MDT

* AT 747 PM MDT...DOPPLER RADAR INDICATED A FEW SEVERE THUNDERSTORMS
  ALONG AND EAST OF INTERSTATE 25 AND SOUTH OF INTERSTATE 90 ACROSS
  JOHNSON COUNTY. THE STRONGEST STORM WAS LOCATED 8 MILES WEST OF
  LINCH...WHICH IS 14 MILES SOUTHEAST OF KAYCEE...MOVING EAST
  NORTHEAST AT 25 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. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  LINCH AROUND 810 PM MDT.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 25 BETWEEN MILE MARKERS 236 AND 271.
 INTERSTATE 90 BETWEEN MILE MARKERS 78 AND 95.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4350 10685 4368 10673 4392 10668 4413 10651
      4436 10614 4433 10602 4350 10602
TIME...MOT...LOC 0147Z 252DEG 22KT 4362 10638 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

21

4 follow-up statements

205 
WWUS55 KRIW 180202
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
802 PM MDT FRI JUN 17 2016

WYC019-180245-
/O.CON.KRIW.SV.W.0021.000000T0000Z-160618T0245Z/
JOHNSON-
802 PM MDT FRI JUN 17 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM MDT
FOR SOUTHEASTERN JOHNSON COUNTY...

AT 758 PM MDT...DOPPLER RADAR INDICATED A COUPLE OF SEVERE
THUNDERSTORMS ACROSS EASTERN AND SOUTHEASTERN JOHNSON COUNTY. ONE
THUNDERSTORM WAS ABOUT 10 MILES NORTH OF FORT RENO HISTORICAL
SITE...WHICH IS 25 MILES NORTHEAST OF KAYCEE. THE OTHER SEVERE
THUNDERSTORM WAS NEAR THE POWDER RIVER REST AREA. THE STORMS WERE
MOVING EAST TO NORTHEAST AT AROUND 35 MPH.  

HAZARD...GOLF BALL SIZE HAIL AND 60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL 
         DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. EXPECT 
         WIND DAMAGE TO ROOFS...SIDING AND TREES. 

THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
EASTERN AND SOUTHEASTERN JOHNSON COUNTY.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 25 BETWEEN MILE MARKERS 236 AND 271.
 INTERSTATE 90 BETWEEN MILE MARKERS 78 AND 95.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4350 10685 4368 10673 4392 10668 4413 10651
      4436 10614 4433 10602 4350 10602
TIME...MOT...LOC 0158Z 223DEG 32KT 4398 10623 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

21

494 
WWUS55 KRIW 180220
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
820 PM MDT FRI JUN 17 2016

WYC019-180245-
/O.CON.KRIW.SV.W.0021.000000T0000Z-160618T0245Z/
JOHNSON-
820 PM MDT FRI JUN 17 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM MDT
FOR SOUTHEASTERN JOHNSON COUNTY...

AT 818 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED OVER POWDER RIVER
REST AREA...WHICH IS 31 MILES EAST OF BUFFALO...MOVING NORTHEAST AT
35 MPH. ALSO...ANOTHER STORM WAS BEGINNING TO INTENSIFY NEAR KAYCEE.

HAZARD...GOLF BALL SIZE HAIL AND 60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL 
         DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. EXPECT 
         WIND DAMAGE TO ROOFS...SIDING AND TREES. 

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 25 BETWEEN MILE MARKERS 236 AND 271.
 INTERSTATE 90 BETWEEN MILE MARKERS 78 AND 95.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4350 10685 4368 10673 4392 10668 4413 10651
      4436 10614 4433 10602 4350 10602
TIME...MOT...LOC 0218Z 221DEG 29KT 4419 10612 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

21

442 
WWUS55 KRIW 180234
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
834 PM MDT FRI JUN 17 2016

WYC019-180245-
/O.CON.KRIW.SV.W.0021.000000T0000Z-160618T0245Z/
JOHNSON-
834 PM MDT FRI JUN 17 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM MDT
FOR SOUTHEASTERN JOHNSON COUNTY...

AT 832 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR POWDER RIVER
REST AREA...WHICH IS 28 MILES WEST OF GILLETTE...MOVING NORTHEAST AT
30 MPH.

HAZARD...GOLF BALL SIZE HAIL AND 60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL 
         DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. EXPECT 
         WIND DAMAGE TO ROOFS...SIDING AND TREES. 

THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
EXTREME EASTERN JOHNSON COUNTY...AND IS EXPECTED TO PUSH INTO
CAMPBELL COUNTY IN ABOUT 10 MINUTES.

THIS INCLUDES INTERSTATE 90 BETWEEN MILE MARKERS 78 AND 95.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4360 10638 4367 10655 4390 10659 4413 10651
      4436 10614 4433 10602 4361 10602
TIME...MOT...LOC 0232Z 221DEG 25KT 4426 10606 

HAIL...1.75IN
WIND...60MPH
 
$$

21

256 
WWUS55 KRIW 180243
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
843 PM MDT FRI JUN 17 2016

WYC019-180252-
/O.EXP.KRIW.SV.W.0021.000000T0000Z-160618T0245Z/
JOHNSON-
843 PM MDT FRI JUN 17 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JOHNSON COUNTY
WILL EXPIRE AT 845 PM MDT...
                
THE STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4360 10638 4367 10655 4390 10659 4413 10651
      4436 10614 4433 10602 4361 10602
TIME...MOT...LOC 0240Z 252DEG 22KT 4426 10606 

$$

21

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 6:09 PM MDT	Special Weather Statement	RIW	Big Horn	51 min
Jun 17, 6:24 PM MDT	Special Weather Statement	RIW	Natrona	36 min
Jun 17, 6:36 PM MDT	Special Weather Statement	RIW	Big Horn	39 min
Jun 17, 7:14 PM MDT	Special Weather Statement	RIW	Big Horn	46 min
Jun 17, 7:43 PM MDT	Special Weather Statement	RIW	Johnson	47 min
Jun 17, 8:48 PM MDT	Special Weather Statement	RIW	Sheridan	42 min
Jun 17, 8:51 PM MDT	Special Weather Statement	RIW	Johnson	39 min
Jun 17, 9:17 PM MDT	Special Weather Statement	RIW	Johnson	43 min
Jun 17, 9:45 PM MDT	Special Weather Statement	RIW	Sheridan	15 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2016 Every severe thunderstorm warning in 2016

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.