Alert archive / Wyoming / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 301

June 15, 201511 counties in Idaho; 9 counties in Utah; 16 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jun 15, 2015, 2:24 PM MDT for 11 counties in Idaho; 9 counties in Utah; 16 counties in Wyoming. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 15, 2015, 2:24 PM MDT (20:24 UTC)
Expired
Jun 15, 2015, 10:08 PM MDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 36 counties

Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Bonneville County, ID, Caribou County, ID, Franklin County, ID, Jefferson County, ID, Madison County, ID, Oneida County, ID, Power County, ID, Teton County, ID, Box Elder County, UT, Cache County, UT, Davis County, UT, Morgan County, UT, Rich County, UT, Salt Lake County, UT, Summit County, UT, Tooele County, UT, Weber County, UT, Albany County, WY, Carbon County, WY, Converse County, WY, Fremont County, WY, Goshen County, WY, Hot Springs County, WY, Johnson County, WY, Laramie County, WY, Lincoln County, WY, Natrona County, WY, Platte County, WY, Sublette County, WY, Sweetwater County, WY, Teton County, WY, Uinta County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 116 km from the middle of the area, began a volume at 20:25 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 15, 2:46 PM MDTSevere Thunderstorm WarningCYSCarbon33 min
Jun 15, 2:50 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham, Bonneville, Caribou55 min
Jun 15, 3:40 PM MDTSevere Thunderstorm WarningPIHBingham, Bonneville, Caribou50 min
Jun 15, 3:54 PM MDTSevere Thunderstorm WarningPIHBonneville, Jefferson, Madison27 min
Jun 15, 4:02 PM MDTTornado Warning Tornado observedCYSCarbon28 min
Jun 15, 4:03 PM MDTTornado WarningPIHBingham, Bonneville, Caribou42 min
Jun 15, 4:19 PM MDTSevere Thunderstorm WarningPIHBonneville, Jefferson, Madison, Teton56 min
Jun 15, 4:22 PM MDTSevere Thunderstorm WarningPIHCassia, Oneida38 min
Jun 15, 4:53 PM MDTTornado WarningPIHBonneville, Caribou22 min
Jun 15, 4:53 PM MDTSevere Thunderstorm WarningCYSPlatte37 min
Jun 15, 4:57 PM MDTTornado WarningRIWLincoln33 min
Jun 15, 5:01 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham, Blaine, Cassia, Power44 min
Jun 15, 5:15 PM MDTSevere Thunderstorm WarningSLCTooele30 min
Jun 15, 5:25 PM MDTSevere Thunderstorm WarningPIHCassia, Oneida, Power35 min
Jun 15, 5:38 PM MDTSevere Thunderstorm WarningRIWTeton37 min
Jun 15, 5:45 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham, Blaine, Bonneville, Caribou, Power60 min
Jun 15, 5:58 PM MDTSevere Thunderstorm WarningPIHBingham, Cassia, Power47 min
Jun 15, 5:59 PM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake31 min
Jun 15, 6:30 PM MDTSevere Thunderstorm WarningSLCRich, Weber30 min
Jun 15, 6:37 PM MDTSevere Thunderstorm WarningSLCSalt Lake, Tooele, Utah23 min
Jun 15, 6:42 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham, Power48 min
Jun 15, 6:46 PM MDTSevere Thunderstorm WarningPIHBingham, Bonneville, Caribou59 min
Jun 15, 7:01 PM MDTTornado WarningPIHBingham, Bonneville, Caribou29 min
Jun 15, 7:09 PM MDTSevere Thunderstorm WarningPIHBannock, Caribou, Franklin, Oneida54 min
Jun 15, 7:27 PM MDTSevere Thunderstorm WarningPIHBingham, Bonneville16 min
Jun 15, 7:36 PM MDTSevere Thunderstorm WarningRIWLincoln24 min
Jun 15, 7:40 PM MDTSevere Thunderstorm WarningPIHBonneville, Caribou20 min
Jun 15, 8:00 PM MDTSevere Thunderstorm WarningPIHBear Lake, Bonneville, Caribou, Franklin45 min
Jun 15, 8:00 PM MDTSevere Thunderstorm WarningRIWLincoln, Sublette30 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 8.4 hours before the alert went out and 122 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-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2015-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2015-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
889 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
345 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 15, 12:41 PM MDTMesoscale DiscussionSPCBannock, Bear Lake, Bingham, Bonneville, Caribou, Franklin and 2 more94 min
Jun 15, 4:22 PM MDTMesoscale DiscussionSPCBannock, Bear Lake, Bingham, Bonneville, Caribou, Cassia and 9 more83 min

Nearby

Severe Thunderstorm Watches in Wyoming, 2015Severe Thunderstorm Watches in Idaho, 2015Severe Thunderstorm Watches in Utah, 2015Every severe thunderstorm watch in 2015

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.