Alert archive / Wyoming / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 55, NWS Riverton, WY

July 6, 2013Park County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 6, 2013, 5:16 PM MDT for Park County, Wyoming. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 6, 2013, 5:16 PM MDT (23:16 UTC)
Expired
Jul 6, 2013, 6:15 PM MDT
In force
59 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Park County, WY

The radar

The Billings radar (KBLX), 167 km from the middle of the area, began a volume at 23:16 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 11.3 hours before the alert went out and 457 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, Salt Lake City I, UT at 12:00Z on 2013-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2013-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2059 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 6, 1:56 PM MDT, 3 hours 20 minutes earlier.

Area forecast discussion, Jul 6, 1:56 PM MDT, 3 hours 20 minutes before
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Hazardous weather outlook, Jul 6, 9:06 AM MDT, 8 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
906 AM MDT SAT JUL 6 2013

WYZ001>020-022>030-071200-
ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST-
BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS-
EAST SWEETWATER COUNTY-FLAMING GORGE-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS-
NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN-
NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS-
ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES-
SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN-
SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY-
TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN-
WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST-
YELLOWSTONE NATIONAL PARK-
906 AM MDT SAT JUL 6 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED TO NUMEROUS THUNDERSTORMS. SOME STORMS COULD BE STRONG
IN THE AFTERNOON AND EVENING WITH HAIL...GUSTY WIND...AND HEAVY
RAIN. A FEW STORMS COULD EVEN TURN SEVERE WITH LARGE HAIL AND
DAMAGING WIND IN THE FAR WEST INCLUDING PARK...TETON AND LINCOLN
COUNTIES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SUNDAY THROUGH MONDAY...ISOLATED TO SCATTERED THUNDERSTORMS.
SOME STORMS COULD BE STRONG IN THE AFTERNOON AND EVENING.

TUESDAY...WEDNESDAY AND FRIDAY...ISOLATED THUNDERSTORMS EACH
AFTERNOON AND EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD REPORT HAIL SIZES...WIND DAMAGE OR HEAVY RAINFALL.

TEAM RIVERTON

In the hours before

Special weather statement, Jul 6, 4:33 PM MDT, 43 minutes before
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Special weather statement, Jul 6, 4:42 PM MDT, 34 minutes before
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Special weather statement, Jul 6, 4:45 PM MDT, 31 minutes before
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Special weather statement, Jul 6, 4:49 PM MDT, 27 minutes before
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Special weather statement, Jul 6, 4:57 PM MDT, 19 minutes before
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Special weather statement, Jul 6, 5:02 PM MDT, 14 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 6:04 PM MDTSpecial Weather StatementRIW41 min
Jul 5, 6:26 PM MDTSevere Thunderstorm WarningRIWNatrona64 min
Jul 5, 6:41 PM MDTSpecial Weather StatementRIWLincoln49 min
Jul 5, 7:43 PM MDTSpecial Weather StatementRIW62 min
Jul 5, 7:44 PM MDTSpecial Weather StatementRIWHot Springs46 min
Jul 5, 8:13 PM MDTSpecial Weather StatementRIWSublette47 min
Jul 5, 8:35 PM MDTSpecial Weather StatementRIWTeton40 min
Jul 5, 9:07 PM MDTSpecial Weather StatementRIW53 min
Jul 5, 10:21 PM MDTSpecial Weather StatementRIWNatrona39 min
Jul 6, 12:42 PM MDTSevere Thunderstorm WarningRIWTeton63 min
Jul 6, 1:23 PM MDTSpecial Weather StatementRIW52 min
Jul 6, 1:42 PM MDTSpecial Weather StatementRIWTeton63 min
Jul 6, 2:17 PM MDTSpecial Weather StatementRIWTeton58 min
Jul 6, 2:55 PM MDTSpecial Weather StatementRIWHot Springs50 min
Jul 6, 2:57 PM MDTSpecial Weather StatementRIWNatrona63 min
Jul 6, 2:58 PM MDTSpecial Weather StatementRIWPark47 min
Jul 6, 3:02 PM MDTSpecial Weather StatementRIW43 min
Jul 6, 3:13 PM MDTSpecial Weather StatementRIWTeton47 min
Jul 6, 3:28 PM MDTSpecial Weather StatementRIWPark47 min
Jul 6, 3:32 PM MDTSpecial Weather StatementRIWJohnson43 min
Jul 6, 3:37 PM MDTSpecial Weather StatementRIW38 min
Jul 6, 3:57 PM MDTSpecial Weather StatementRIWFremont48 min
Jul 6, 3:58 PM MDTSpecial Weather StatementRIW47 min
Jul 6, 4:05 PM MDTSpecial Weather StatementRIWTeton40 min
Jul 6, 4:17 PM MDTSpecial Weather StatementRIWPark43 min
Jul 6, 4:21 PM MDTSpecial Weather StatementRIWJohnson24 min
Jul 6, 4:23 PM MDTSpecial Weather StatementRIWSublette52 min
Jul 6, 4:33 PM MDTSpecial Weather StatementRIWSweetwater87 min
Jul 6, 4:42 PM MDTSpecial Weather StatementRIWFremont48 min
Jul 6, 4:45 PM MDTSpecial Weather StatementRIWBig Horn, Washakie45 min
Jul 6, 4:49 PM MDTSpecial Weather StatementRIWTeton41 min
Jul 6, 4:57 PM MDTSpecial Weather StatementRIWPark48 min
Jul 6, 5:02 PM MDTSpecial Weather StatementRIW43 min
Jul 6, 5:10 PM MDTSevere Thunderstorm WarningRIWBig Horn, Park65 min
Jul 6, 5:58 PM MDTSpecial Weather StatementRIWTeton47 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2013Every severe thunderstorm warning 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.