Alert archive / Wyoming / Special Weather Statements in 2016

Special Weather Statement, NWS Riverton, WY

May 9, 2016Johnson County, Wyoming

NWS Riverton, WY issued this special weather statement at May 9, 2016, 8:02 PM MDT for Johnson County, Wyoming. It was in force for 43 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
May 9, 2016, 8:02 PM MDT (02:02 UTC)
Expired
May 9, 2016, 8:45 PM MDT
In force
43 min
Issued by
NWS Riverton, WY

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 171 km from the middle of the area, began a volume at 02:05 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 text

As transmitted.

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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 May 9, 3:06 PM MDT, 4 hours 56 minutes earlier.

Area forecast discussion, May 9, 3:06 PM MDT, 4 hours 56 minutes before
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Hazardous weather outlook, May 9, 3:07 AM MDT, 16 hours 55 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
307 AM MDT MON MAY 9 2016

WYZ001>020-022>030-101200-
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS-
NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN-
SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS-
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE-
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY-
SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS-
UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY-
ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY-
307 AM MDT MON MAY 9 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL
WYOMING.

...RIVER FLOOD WARNING FOR THE LITTLE WIND RIVER NEAR RIVERTON THROUGH
TUESDAY MORNING...

...AREAL FLOOD WARNING FOR MUCH OF CENTRAL AND SOUTHERN FREMONT
COUNTIES THROUGH 300 PM MDT THIS AFTERNOON...

.DAY ONE...THIS AFTERNOON AND TONIGHT

RAIN/SNOWMELT FLOODING CONTINUES FOR PORTIONS OF CENTRAL AND
SOUTHERN FREMONT COUNTY. MORE SHOWERS AND THUNDERSTORMS WILL
OCCUR ACROSS THE NORTHWEST AND NORTH TODAY. LIGHT TO OCCASIONALLY
MODERATE SNOW TO RETURN TO THE WESTERN...CENTRAL AND NORTHERN
MOUNTAINS AND VALLEYS TONIGHT...WITH SNOW LOWERING TO VALLEY
FLOORS BY TUESDAY MORNING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

MORE RAIN AND SNOW SHOWERS WILL CONTINUE ACROSS THE WEST AND
NORTH TUESDAY AS A COLD FRONT WILL BRING MORE WIDESPREAD SHOWERS
TO THE NORTH WITH SNOW DOWN AS LOW AS 5500 FEET TUESDAY NIGHT.
THUNDERSTORMS AND SHOWERS ARE EXPECTED TO INCREASE ONCE AGAIN OVER
THE WEEKEND FROM WEST TO EAST ALONG WITH FALLING TEMPERATURES ONCE
SATURDAY NIGHT AND SUNDAY ALONG WITH SOME MOUNTAIN AND POTENTIAL
FOOTHILL SNOW. WARMER TEMPERATURES THOUGH FRIDAY AND SATURDAY
WILL INCREASE RUNOFF FROM SNOWMELT ACROSS WESTERN AND CENTRAL
WYOMING.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY FLOODING...HAIL...WIND GUSTS
OVER 45 MPH AS WELL AS ANY HEAVY SNOW ACCUMULATIONS.

In the hours before

Special weather statement, May 9, 6:49 PM MDT, 1 hour 13 minutes before
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Special weather statement, May 9, 6:53 PM MDT, 1 hour 9 minutes before
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Special weather statement, May 9, 7:10 PM MDT, 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
710 PM MDT MON MAY 9 2016

WYZ009-011-020-100145-
SOUTHEAST JOHNSON COUNTY-NATRONA COUNTY LOWER ELEVATIONS-BIGHORN
MOUNTAINS SOUTHEAST-
710 PM MDT MON MAY 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL NATRONA AND SOUTH
CENTRAL JOHNSON COUNTIES UNTIL 745 PM MDT...

AT 707 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM RED WALL TO 10 MILES
NORTHEAST OF NATRONA...AND MOVING EAST AND NORTHEAST AT 25 MPH.

THE MAIN HAZARDS WILL BE BRIEF HEAVY RAINFALL...SMALL HAIL...AND
DANGEROUS LIGHTNING. HEAVY RAINFALL MAY LEAD TO FLOODING OF LOW
LYING OR POOR DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE THROUGH
FLOODED ROADWAYS.

THESE STORMS WILL REMAIN OVER MAINLY RURAL AREAS OF NORTH CENTRAL
NATRONA AND SOUTH CENTRAL JOHNSON COUNTIES...INCLUDING THE FOLLOWING
LOCATIONS...WILLOW CREEK SCHOOL.

LAT...LON 4358 10662 4332 10645 4311 10642 4304 10659
      4323 10682 4341 10702 4356 10690
TIME...MOT...LOC 0107Z 253DEG 21KT 4338 10688 4325 10673 4311 10657

21
Special weather statement, May 9, 7:16 PM MDT, 46 minutes before
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Special weather statement, May 9, 7:19 PM MDT, 43 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
719 PM MDT MON MAY 9 2016

WYZ004-006-008-100200-
NORTH BIG HORN BASIN-SOUTHEAST BIG HORN BASIN-BIGHORN MOUNTAINS WEST-
719 PM MDT MON MAY 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WASHAKIE AND SOUTH
CENTRAL BIG HORN COUNTIES UNTIL 800 PM MDT...

AT 719 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM GREYBULL TO 10 MILES WEST
OF MANDERSON...AND MOVING NORTHEAST AT 30 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

STRONG THUNDERSTORMS WILL BE NEAR...
  GREYBULL AROUND 725 PM MDT.
  BASIN AND MANDERSON AROUND 740 PM MDT.
  SHELL AROUND 745 PM MDT.
  SHELL CANYON AROUND 755 PM MDT.
  SHELL FALLS AROUND 800 PM MDT.

LAT...LON 4471 10768 4469 10769 4468 10767 4470 10762
      4466 10752 4464 10753 4463 10751 4464 10750
      4462 10749 4426 10762 4411 10827 4454 10810
      4471 10772
TIME...MOT...LOC 0119Z 242DEG 27KT 4450 10805 4422 10816

BRAUN
Special weather statement, May 9, 8:02 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
802 PM MDT MON MAY 9 2016

WYZ009-011-020-100245-
SOUTHEAST JOHNSON COUNTY-NATRONA COUNTY LOWER ELEVATIONS-BIGHORN
MOUNTAINS SOUTHEAST-
802 PM MDT MON MAY 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN NATRONA AND
SOUTHEASTERN JOHNSON COUNTIES UNTIL 845 PM MDT...

AT 802 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR HOLE IN THE WALL TO 14
MILES SOUTHWEST OF RED WALL...AND MOVING NORTHEAST AT 55 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

STRONG THUNDERSTORMS WILL BE NEAR...
  HOLE IN THE WALL AROUND 805 PM MDT.
  RED WALL AROUND 820 PM MDT.
  FORT RENO HISTORICAL SITE AROUND 845 PM MDT.

OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE SUSSEX...WILLOW
CREEK SCHOOL...SALT CREEK COUNTRY CLUB AND MIDWEST SCHOOL.

THIS INCLUDES INTERSTATE 25 BETWEEN MILE MARKERS 226 AND 251.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4396 10608 4340 10626 4324 10728 4358 10685
TIME...MOT...LOC 0202Z 243DEG 46KT 4356 10685 4332 10716

BRAUN

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 6:00 PM MDTSpecial Weather StatementRIWBig Horn45 min
May 9, 6:20 PM MDTSpecial Weather StatementRIWWashakie25 min
May 9, 6:32 PM MDTSpecial Weather StatementRIWNatrona43 min
May 9, 6:37 PM MDTSpecial Weather StatementRIWBig Horn38 min
May 9, 6:49 PM MDTSpecial Weather StatementRIW41 min
May 9, 6:53 PM MDTSpecial Weather StatementRIWBig Horn37 min
May 9, 7:10 PM MDTSpecial Weather StatementRIWNatrona35 min
May 9, 7:16 PM MDTSpecial Weather StatementRIW44 min
May 9, 7:19 PM MDTSpecial Weather StatementRIWBig Horn41 min
May 9, 8:18 PM MDTSpecial Weather StatementRIWBig Horn42 min
May 9, 11:07 PM MDTSpecial Weather StatementRIWNatrona53 min
May 9, 11:28 PM MDTSevere Thunderstorm WarningRIWNatrona32 min
May 9, 11:57 PM MDTSpecial Weather StatementRIWNatrona48 min
May 10, 12:58 AM MDTSpecial Weather StatementRIWNatrona32 min
May 10, 1:32 AM MDTSpecial Weather StatementRIWNatrona28 min
May 10, 1:56 PM MDTFreeze WarningRIWFremont, Lincoln, Natrona, Sublette, Sweetwater19 hr

Nearby

Special Weather Statements in Wyoming, 2016Every special weather statement in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.