Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 31, NWS Riverton, WY

June 19, 2008Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 19, 2008, 1:34 PM MDT for Natrona County, Wyoming. It was in force for 41 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: Jun 19, 2008, 1:34 PM MDT (19:34 UTC)
Expired: Jun 19, 2008, 2:15 PM MDT
In force: 41 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

County Natrona County, WY

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 7.6 hours before the alert went out and 339 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: 1425 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 32 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 Jun 19, 2:55 AM MDT, 10 hours 39 minutes earlier.

Area forecast discussion, Jun 19, 2:55 AM MDT, 10 hours 39 minutes before

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Hazardous weather outlook, Jun 19, 12:28 PM MDT, 1 hour 6 minutes before

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In the hours before

Special weather statement, Jun 19, 12:05 PM MDT, 1 hour 29 minutes before

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Special weather statement, Jun 19, 12:31 PM MDT, 1 hour 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1231 PM MDT THU JUN 19 2008

WYZ019-020-022-191930-
CASPER MOUNTAIN-GREEN MOUNTAINS AND RATTLESNAKE RANGE-NATRONA COUNTY
LOWER ELEVATIONS-
1231 PM MDT THU JUN 19 2008

...SIGNIFICANT WEATHER ADVISORY FOR NATRONA COUNTY...

AT 1228 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT THUNDERSTORMS WERE RAPIDLY DEVELOPING 6 MILES NORTHWEST OF U.S.
HWY 220 MILE MARKER 80...OR 32 MILES SOUTHWEST OF CASPER...MOVING
SOUTHEAST AT 21 MPH.

HALF INCH HAIL...AND WINDS AROUND 40 MPH ARE POSSIBLE WITH THESE
STORMS.

RESIDENTS IN SOUTHERN NATRONA COUNTY...INCLUDING THE LOCATIONS OF
U.S. HWY 220 MILE MARKER 80...ALCOVA AND U.S. HWY 220 MILE MARKER
90...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. IF RECREATING ON
ALCOVA RESERVOIR...HEAD TO SHORE AT THE FIRST SIGN OF THREATENING
WEATHER. 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 4252 10640 4243 10649 4243 10671 4243 10672
      4243 10677 4261 10706 4275 10691
TIME...MOT...LOC 1831Z 306DEG 18KT 4263 10689

LIPSON

Special weather statement, Jun 19, 12:37 PM MDT, 57 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1237 PM MDT THU JUN 19 2008

WYZ009-010-191930-
BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY-
1237 PM MDT THU JUN 19 2008

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

AT 1232 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 5 MILES SOUTHWEST OF SADDLESTRING...OR 12 MILES
WEST OF BUFFALO...MOVING EAST AT 8 MPH.

PEA SIZE HAIL...AND WINDS AROUND 40 MPH ARE POSSIBLE WITH THIS STORM.

RESIDENTS IN NORTHERN JOHNSON COUNTY...INCLUDING THE LOCATIONS OF
SADDLESTRING...I90 EXIT 51...I90 EXIT 47...LAKE DE SMET AND I90 EXIT
53...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 4433 10700 4443 10705 4457 10675 4457 10674
      4456 10667 4456 10666 4435 10656
TIME...MOT...LOC 1837Z 251DEG 7KT 4439 10694

SMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 6:26 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	64 min
Jun 18, 6:38 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	37 min
Jun 18, 6:39 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	36 min
Jun 18, 6:58 PM MDT	Tornado Warning	RIW	Natrona	47 min
Jun 18, 7:59 PM MDT	Special Weather Statement	RIW	Sublette	61 min
Jun 19, 12:05 PM MDT	Special Weather Statement	RIW	Johnson	40 min
Jun 19, 12:31 PM MDT	Special Weather Statement	RIW	Natrona	59 min
Jun 19, 12:37 PM MDT	Special Weather Statement	RIW	Sheridan	53 min
Jun 19, 12:44 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	20 min
Jun 19, 1:41 PM MDT	Special Weather Statement	RIW	Hot Springs	64 min
Jun 19, 2:14 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	61 min
Jun 19, 2:56 PM MDT	Special Weather Statement	RIW	Hot Springs	64 min
Jun 19, 4:51 PM MDT	Special Weather Statement	RIW	Big Horn	54 min
Jun 19, 5:24 PM MDT	Special Weather Statement	RIW	Big Horn	51 min
Jun 19, 5:53 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	52 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.