Alert archive / Wyoming / Special Weather Statements in 2012

Special Weather Statement, NWS Riverton, WY

July 17, 2012Johnson County, Wyoming

NWS Riverton, WY issued this special weather statement at Jul 17, 2012, 2:04 PM MDT for Johnson County, Wyoming. It was in force for 26 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
Jul 17, 2012, 2:04 PM MDT (20:04 UTC)
Expired
Jul 17, 2012, 2:30 PM MDT
In force
26 min
Issued by
NWS Riverton, WY

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 177 km from the middle of the area, began a volume at 20:05 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 12:00Z, 8.1 hours before the alert went out and 171 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 2012-07-17Temperature 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 12:00Z on 2012-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.193958Sfc1 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
1882 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
43 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 17, 1:57 PM MDT, 7 minutes earlier.

Area forecast discussion, Jul 17, 1:57 PM MDT, 7 minutes before
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Hazardous weather outlook, Jul 17, 4:00 AM MDT, 10 hours 4 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
400 AM MDT TUE JUL 17 2012

WYZ001>020-022>030-181200-
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-
400 AM MDT TUE JUL 17 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED MOUNTAIN THUNDERSTORMS ARE EXPECTED WITH ISOLATED
THUNDERSTORMS ELSEWHERE. THE STRONGEST STORMS ARE EXPECTED MAINLY
ACROSS JOHNSON COUNTY...WITH THE MAIN HAZARDS OF STRONG AND ERRATIC
WINDS...CLOUD TO GROUND LIGHTNING...AND VERY HEAVY RAINFALL WITH THE
POTENTIAL OF LOCALIZED FLOODING. ELSEWHERE...THE MAIN HAZARD WILL BE
STRONG AND ERRATIC WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

WEDNESDAY AND THURSDAY...ISOLATED MOUNTAIN THUNDERSTORMS ARE
POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT RAINFALL AMOUNTS...ANY FLOODING...
HAIL AND GUSTS ABOVE 40 MPH.. THANK YOU.

TEAM RIVERTON

In the hours before

Special weather statement, Jul 17, 1:03 PM MDT, 1 hour 1 minute before
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Special weather statement, Jul 17, 1:15 PM MDT, 49 minutes before
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Special weather statement, Jul 17, 1:24 PM MDT, 40 minutes before
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Special weather statement, Jul 17, 1:27 PM MDT, 37 minutes before
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Special weather statement, Jul 17, 1:52 PM MDT, 12 minutes before
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Special weather statement, Jul 17, 2:04 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 6:14 PM MDTSpecial Weather StatementRIWTeton46 min
Jul 16, 6:17 PM MDTSpecial Weather StatementRIW43 min
Jul 16, 7:07 PM MDTSpecial Weather StatementRIW38 min
Jul 16, 8:30 PM MDTSpecial Weather StatementRIWJohnson45 min
Jul 16, 9:52 PM MDTSpecial Weather StatementRIWWashakie53 min
Jul 16, 9:55 PM MDTSpecial Weather StatementRIWSublette50 min
Jul 16, 10:36 PM MDTSpecial Weather StatementRIWJohnson39 min
Jul 16, 11:14 PM MDTSpecial Weather StatementRIWJohnson46 min
Jul 16, 11:57 PM MDTSpecial Weather StatementRIWJohnson48 min
Jul 17, 12:21 PM MDTSpecial Weather StatementRIWJohnson39 min
Jul 17, 12:31 PM MDTSpecial Weather StatementRIW44 min
Jul 17, 12:35 PM MDTSpecial Weather StatementRIWJohnson40 min
Jul 17, 12:45 PM MDTSpecial Weather StatementRIW45 min
Jul 17, 12:58 PM MDTSpecial Weather StatementRIWJohnson47 min
Jul 17, 1:00 PM MDTSpecial Weather StatementRIWHot Springs30 min
Jul 17, 1:03 PM MDTSpecial Weather StatementRIWJohnson27 min
Jul 17, 1:15 PM MDTSpecial Weather StatementRIW30 min
Jul 17, 1:24 PM MDTSpecial Weather StatementRIWJohnson51 min
Jul 17, 1:27 PM MDTSpecial Weather StatementRIW48 min
Jul 17, 2:08 PM MDTSpecial Weather StatementRIWHot Springs37 min
Jul 17, 2:15 PM MDTSpecial Weather StatementRIWBig Horn30 min
Jul 17, 2:31 PM MDTSpecial Weather StatementRIWHot Springs29 min
Jul 17, 2:36 PM MDTSpecial Weather StatementRIWHot Springs24 min
Jul 17, 3:00 PM MDTSpecial Weather StatementRIWBig Horn45 min
Jul 17, 4:10 PM MDTSpecial Weather StatementRIWWashakie50 min
Jul 17, 5:08 PM MDTSpecial Weather StatementRIWJohnson52 min

Nearby

Special Weather Statements in Wyoming, 2012Every special weather statement in 2012

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.