Alert archive / Wyoming / Tornado Watches in 2013

Tornado Watch 343

June 22, 201315 counties in Wyoming

The Storm Prediction Center issued this tornado watch at Jun 22, 2013, 10:59 AM MDT for 15 counties in Wyoming. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 22, 2013, 10:59 AM MDT (16:59 UTC)
Expired
Jun 22, 2013, 6:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt

Counties Albany County, WY, Big Horn County, WY, Campbell County, WY, Converse County, WY, Crook County, WY, Fremont County, WY, Goshen County, WY, Hot Springs County, WY, Johnson County, WY, Laramie County, WY, Natrona County, WY, Niobrara County, WY, Platte County, WY, Washakie County, WY, Weston County, WY

The radar

The Riverton/Lander radar (KRIW), 183 km from the middle of the area, began a volume at 17:00 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
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
80%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 22, 11:23 AM MDTSevere Thunderstorm WarningRIWFremont, Natrona52 min
Jun 22, 11:39 AM MDTSevere Thunderstorm WarningRIWNatrona51 min
Jun 22, 12:09 PM MDTSevere Thunderstorm WarningRIWNatrona51 min
Jun 22, 12:45 PM MDTSevere Thunderstorm WarningRIWNatrona45 min
Jun 22, 12:50 PM MDTTornado WarningRIWNatrona25 min
Jun 22, 12:57 PM MDTSevere Thunderstorm WarningCYSAlbany, Converse, Platte48 min
Jun 22, 1:15 PM MDTTornado WarningRIWNatrona30 min
Jun 22, 1:24 PM MDTSevere Thunderstorm WarningRIWNatrona51 min
Jun 22, 1:28 PM MDTSevere Thunderstorm WarningCYSPlatte47 min
Jun 22, 1:36 PM MDTSevere Thunderstorm WarningRIWNatrona39 min
Jun 22, 1:39 PM MDTTornado WarningCYSPlatte51 min
Jun 22, 1:41 PM MDTTornado WarningRIWNatrona34 min
Jun 22, 1:47 PM MDTTornado WarningCYSConverse43 min
Jun 22, 2:25 PM MDTTornado WarningCYSGoshen, Platte50 min
Jun 22, 2:26 PM MDTSevere Thunderstorm WarningUNRCampbell64 min
Jun 22, 2:27 PM MDTSevere Thunderstorm WarningCYSConverse48 min
Jun 22, 2:45 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie, Platte45 min
Jun 22, 3:01 PM MDTSevere Thunderstorm WarningUNRCampbell, Crook59 min
Jun 22, 3:04 PM MDTSevere Thunderstorm WarningUNRCampbell56 min
Jun 22, 3:15 PM MDTSevere Thunderstorm WarningCYSConverse, Niobrara45 min
Jun 22, 3:27 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte48 min
Jun 22, 3:28 PM MDTSevere Thunderstorm WarningCYSGoshen47 min
Jun 22, 3:28 PM MDTTornado WarningUNRCrook32 min
Jun 22, 3:52 PM MDTSevere Thunderstorm WarningUNRCrook53 min
Jun 22, 3:53 PM MDTTornado WarningCYSGoshen37 min
Jun 22, 4:17 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie58 min
Jun 22, 4:21 PM MDTSevere Thunderstorm WarningUNRWeston54 min
Jun 22, 4:26 PM MDTSevere Thunderstorm WarningCYSConverse, Goshen, Niobrara, Platte49 min
Jun 22, 4:29 PM MDTSevere Thunderstorm WarningCYSGoshen46 min
Jun 22, 4:44 PM MDTTornado WarningCYSGoshen31 min
Jun 22, 5:21 PM MDTSevere Thunderstorm WarningCYSLaramie54 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, 5.0 hours before the alert went out and 177 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 2013-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 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 2013-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 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
27 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
1614 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 21, 8:39 PM MDTMesoscale DiscussionSPCConverse, Goshen, Niobrara36 min
Jun 22, 10:04 AM MDTMesoscale DiscussionSPCJohnson, Natrona, Washakie116 min
Jun 22, 1:25 PM MDTMesoscale DiscussionSPCAlbany, Carbon, Converse, Fremont, Goshen, Laramie and 4 more2 hr

Nearby

Tornado Watches in Wyoming, 2013Every tornado watch in 2013

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.