Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 47, NWS Riverton, WY

July 1, 2008Fremont County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 1, 2008, 3:23 PM MDT for Fremont County, Wyoming. It was in force for 52 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 1, 2008, 3:23 PM MDT (21:23 UTC)
Expired: Jul 1, 2008, 4:15 PM MDT
In force: 52 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

County Fremont County, WY

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 9.4 hours before the alert went out and 19 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2735 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 79 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 1, 2:10 AM MDT, 13 hours 13 minutes earlier.

Area forecast discussion, Jul 1, 2:10 AM MDT, 13 hours 13 minutes before

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Hazardous weather outlook, Jul 1, 5:00 AM MDT, 10 hours 23 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
500 AM MDT TUE JUL 1 2008

WYZ001>020-022>030-021200-
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-
500 AM MDT TUE JUL 1 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS IN THE WESTERN AND NORTHERN
MOUNTAINS THIS AFTERNOON AND EVENING WILL HAVE THE POTENTIAL TO
PRODUCE STRONG GUSTY WINDS AND HAIL. ISOLATED SHOWERS AND
THUNDERSTORMS WILL DEVELOP THIS AFTERNOON AND EVENING IN THE
BIGHORN BASIN AND MUCH OF EAST CENTRAL WYOMING. THERE IS A SLIGHT
RISK OF SEVERE THUNDERSTORMS IN NORTHERN TETON COUNTY AND
NORTHWESTERN PARK COUNTY THIS AFTERNOON AND EVENING WITH SEVERE WIND
GUSTS AND LARGE HAIL POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED WEDNESDAY IN THE NORTHWESTERN MOUNTAINS AND EAST OF THE
DIVIDE.

ISOLATED THUNDERSTORMS ARE EXPECTED IN NORTHWESTERN WYOMING AS
WELL AS IN JOHNSON AND NATRONA COUNTIES THURSDAY.

THE FOURTH OF JULY HOLIDAY WEEKEND LOOKS VERY WARM TO HOT.
ISOLATED AFTERNOON AND EVENING STORMS WILL OCCUR OVER THE NORTH
AS WELL AS IN NATRONA COUNTY FRIDAY AND SATURDAY.

SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT STRONG WIND GUSTS...HAIL AND
RAINFALL AMOUNTS FROM THUNDERSTORMS THIS AFTERNOON AND EVENING.
THANKS.

TEAM RIVERTON

In the hours before

Special weather statement, Jul 1, 2:33 PM MDT, 50 minutes before

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Special weather statement, Jul 1, 2:52 PM MDT, 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
252 PM MDT TUE JUL 1 2008

WYZ014-025-026-012130-
UPPER GREEN RIVER BASIN-UPPER GREEN RIVER BASIN FOOTHILLS-WIND RIVER
MOUNTAINS WEST-
252 PM MDT TUE JUL 1 2008

...SIGNIFICANT WEATHER ADVISORY FOR SUBLETTE COUNTY...

AT 244 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT
A STRONG THUNDERSTORM WAS LOCATED NEAR NEAR MESA GAS FIELD...OR 13
MILES SOUTH OF PINEDALE...MOVING EAST AT 30 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THIS STORMS.

RESIDENTS IN CENTRAL SUBLETTE COUNTY...INCLUDING THE LOCATIONS OF
BOULDER...U.S. HWY 191 MILE MARKER 80 AND STATE HWY 353 MILE MARKER
10...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR
POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD
SEVERE WEATHER THREATEN.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4285 10930 4280 10923 4278 10924 4276 10923
      4277 10921 4275 10917 4261 10915 4259 10991
      4277 10993
TIME...MOT...LOC 2052Z 264DEG 27KT 4269 10980

CHURCH

Special weather statement, Jul 1, 2:59 PM MDT, 24 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
259 PM MDT TUE JUL 1 2008

WYZ009-011-012200-
BIGHORN MOUNTAINS SOUTHEAST-SOUTHEAST JOHNSON COUNTY-
259 PM MDT TUE JUL 1 2008

...SIGNIFICANT WEATHER ADVISORY FOR JOHNSON COUNTY...

AT 252 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 9 MILES WEST OF KAYCEE MOVING EAST AT 10 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THIS STORM.

RESIDENTS IN SOUTHERN JOHNSON COUNTY...INCLUDING THE LOCATIONS OF
KAYCEE...I25 EXIT 249 AND I25 EXIT 246...SHOULD MONITOR THE WEATHER
SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO
TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4377 10640 4350 10646 4361 10694 4378 10690
TIME...MOT...LOC 2059Z 279DEG 8KT 4368 10679

CHURCH

Special weather statement, Jul 1, 3:08 PM MDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
308 PM MDT TUE JUL 1 2008

WYZ001-012215-
YELLOWSTONE NATIONAL PARK-
308 PM MDT TUE JUL 1 2008

...SIGNIFICANT WEATHER ADVISORY FOR GALLATIN...PARK AND TETON
COUNTIES...

AT 301 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR THE WEST ENTRANCE OF YELLOWSTONE NATIONAL
PARK...OR NEAR WEST YELLOWSTONE...MOVING EAST AT 11 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THIS STORM.

RESIDENTS IN NORTHWESTERN TETON...SOUTHERN GALLATIN AND WESTERN PARK
COUNTIES...INCLUDING THE LOCATIONS OF WEST ENTRANCE...HARLEQUIN
LAKE...FIREHOLE CANYON...GIBBONS FALLS AND GIBBON HILL...SHOULD
MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS
AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER
THREATEN.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4461 11110 4474 11111 4475 11110 4478 11059
      4451 11060 4456 11111 4461 11111
TIME...MOT...LOC 2108Z 271DEG 10KT 4465 11102

CHURCH

Special weather statement, Jul 1, 3:08 PM MDT, 15 minutes before

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE RIVERTON WY
308 PM MDT TUE JUL 1 2008

WYZ001-012215-
YELLOWSTONE NATIONAL PARK-
308 PM MDT TUE JUL 1 2008

...SIGNIFICANT WEATHER ADVISORY FOR YELLOWSTONE NATIONAL
PARK...TETON AND PARK COUNTIES...

AT 301 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR THE WEST ENTRANCE OF YELLOWSTONE NATIONAL
PARK...OR NEAR WEST YELLOWSTONE...MOVING EAST AT 11 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THIS STORM.

RESIDENTS IN NORTHWESTERN TETON...AND WESTERN PARK
COUNTIES...INCLUDING THE LOCATIONS OF WEST ENTRANCE...FIREHOLE
CANYON...GIBBONS FALLS AND GIBBON HILL...SHOULD MONITOR THE WEATHER
SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO
TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4461 11110 4474 11111 4475 11110 4478 11059
      4451 11060 4456 11111 4461 11111
TIME...MOT...LOC 2108Z 271DEG 10KT 4465 11102

CHURCH

Special weather statement, Jul 1, 3:17 PM MDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
317 PM MDT TUE JUL 1 2008

WYZ004-008-012215-
BIGHORN MOUNTAINS WEST-NORTH BIG HORN BASIN-
317 PM MDT TUE JUL 1 2008

...SIGNIFICANT WEATHER ADVISORY FOR BIG HORN COUNTY...

AT 313 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR CROOKED CREEK NATURAL AREA...OR 11 MILES
NORTHEAST OF LOVELL...MOVING SOUTHEAST AT 10 MPH.

HALF INCH HAIL...AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THIS
STORM.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4493 10786 4480 10810 4497 10833 4500 10817
TIME...MOT...LOC 2117Z 312DEG 9KT 4497 10827

MEUNIER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 1:07 PM MDT	Special Weather Statement	RIW		53 min
Jul 1, 1:12 PM MDT	Special Weather Statement	RIW	Johnson	63 min
Jul 1, 1:42 PM MDT	Special Weather Statement	RIW	Fremont	63 min
Jul 1, 1:43 PM MDT	Special Weather Statement	RIW		62 min
Jul 1, 2:01 PM MDT	Special Weather Statement	RIW	Sublette	59 min
Jul 1, 2:30 PM MDT	Special Weather Statement	RIW	Sweetwater	60 min
Jul 1, 2:33 PM MDT	Special Weather Statement	RIW	Hot Springs	57 min
Jul 1, 2:52 PM MDT	Special Weather Statement	RIW	Sublette	38 min
Jul 1, 2:59 PM MDT	Special Weather Statement	RIW	Johnson	61 min
Jul 1, 3:08 PM MDT	Special Weather Statement	RIW		67 min
Jul 1, 3:17 PM MDT	Special Weather Statement	RIW	Big Horn	58 min
Jul 1, 4:12 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	28 min
Jul 1, 4:33 PM MDT	Severe Thunderstorm Warning	RIW	Teton	42 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2008 Every severe thunderstorm warning in 2008

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.