Alert archive / Wyoming / Special Weather Statements in 2011

Special Weather Statement, NWS Riverton, WY

June 29, 2011

NWS Riverton, WY issued this special weather statement at Jun 29, 2011, 9:10 PM MDT. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 29, 2011, 9:10 PM MDT (03:10 UTC)
Expired
Jun 29, 2011, 9:45 PM MDT
In force
35 min
Issued by
NWS Riverton, WY

The radar

The Billings radar (KBLX), 195 km from the middle of the area, began a volume at 03:12 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

Riverton, WY (KRIW), launched 00:00Z, 3.2 hours before the alert went out and 233 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 00:00Z on 2011-06-30Temperature 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 00:00Z on 2011-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
2915 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

121 
WWUS85 KRIW 300310
SPSRIW

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
910 PM MDT WED JUN 29 2011

WYZ001-002-300345-
ABSAROKA MOUNTAINS WY-YELLOWSTONE NATIONAL PARK WY-
910 PM MDT WED JUN 29 2011

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN PARK AND NORTHERN TETON
COUNTIES IN NORTHWEST WYOMING UNTIL 945 PM MDT...

AT 906 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR GRANT VILLAGE...OR 9 MILES SOUTHWEST OF
LAKE...MOVING NORTHEAST AT 45 MPH.

HAIL UP TO ONE-QUARTER INCH IN DIAMETER IS EXPECTED WITH THIS STORM.

THIS STORM WILL BE NEAR...
GRAND LOOP RD GRANT TO LAKE AROUND 915 PM MDT.
LAKE AND MUD VOLCANO AROUND 920 PM MDT.

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

LAT...LON 4482 11036 4458 10997 4435 11048 4448 11066
TIME...MOT...LOC 0310Z 225DEG 37KT 4448 11048

$$

T. BAKER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 7:22 PM MDTSpecial Weather StatementRIWNatrona38 min
Jun 29, 7:55 PM MDTSpecial Weather StatementRIWNatrona50 min
Jun 30, 3:26 AM MDTAreal Flood AdvisoryRIWPark9 hr
Jun 30, 7:25 AM MDTSpecial Weather StatementRIWSweetwater50 min
Jun 30, 9:43 AM MDTAreal Flood AdvisoryRIWFremont24 hr
Jun 30, 1:25 PM MDTSpecial Weather StatementRIWSweetwater50 min
Jun 30, 1:44 PM MDTAreal Flood WarningRIWPark4 days
Jun 30, 1:49 PM MDTSevere Thunderstorm WarningRIWSweetwater40 min
Jun 30, 2:25 PM MDTSpecial Weather StatementRIWBig Horn50 min
Jun 30, 2:27 PM MDTSpecial Weather StatementRIWJohnson48 min
Jun 30, 3:12 PM MDTSpecial Weather StatementRIW48 min
Jun 30, 3:16 PM MDTSpecial Weather StatementRIWBig Horn44 min
Jun 30, 3:20 PM MDTSpecial Weather StatementRIW40 min
Jun 30, 3:26 PM MDTSpecial Weather StatementRIWJohnson49 min
Jun 30, 3:37 PM MDTSpecial Weather StatementRIWSublette53 min
Jun 30, 3:39 PM MDTSpecial Weather StatementRIW51 min
Jun 30, 4:11 PM MDTSpecial Weather StatementRIWJohnson49 min
Jun 30, 4:14 PM MDTSpecial Weather StatementRIW46 min
Jun 30, 4:25 PM MDTSpecial Weather StatementRIWNatrona50 min
Jun 30, 5:01 PM MDTSpecial Weather StatementRIW44 min
Jun 30, 5:58 PM MDTSpecial Weather StatementRIW47 min

Nearby

Special Weather Statements in Wyoming, 2011Every special weather statement in 2011

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.