Alert archive / Wyoming / Special Weather Statements in 2016

Special Weather Statement, NWS Riverton, WY

May 10, 2016Natrona County, Wyoming

NWS Riverton, WY issued this special weather statement at May 10, 2016, 1:32 AM MDT for Natrona County, Wyoming. It was in force for 28 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 10, 2016, 1:32 AM MDT (07:32 UTC)
Expired
May 10, 2016, 2:00 AM MDT
In force
28 min
Issued by
NWS Riverton, WY

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 172 km from the middle of the area, began a volume at 07:33 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, 7.5 hours before the alert went out and 166 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 2016-05-10Temperature 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 2016-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 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
2782 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
-1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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, 11:56 PM MDT, 1 hour 36 minutes earlier.

Area forecast discussion, May 9, 11:56 PM MDT, 1 hour 36 minutes before
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Hazardous weather outlook, May 9, 3:07 AM MDT, 22 hours 25 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, 8:18 PM MDT, 5 hours 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
818 PM MDT MON MAY 9 2016

WYZ004-008-100300-
NORTH BIG HORN BASIN-BIGHORN MOUNTAINS WEST-
818 PM MDT MON MAY 9 2016

AT 814 PM MDT...DOPPLER RADAR WAS TRACKING A BROKEN LINE OF
SHOWERS AND THUNDERSTORMS ALONG A LINE EXTENDING FROM OTTO
TO 6 MILES NORTHEAST OF MANDERSON...AND MOVING NORTHEAST AT 25 MPH.

BRIEF HEAVY RAINFALL AND HALF INCH HAIL WILL OCCUR IN THE STRONGER
STORMS. HAIL COULD ACCUMULATE ON THE GROUND. IN ADDITION...STRONG
NORTH WIND OF 20 TO 30 MPH...WITH GUSTS TO 45 MPH WILL OCCUR ACROSS BIG HORN
COUNTY...IN WAKE OF A COLD FRONT.

LAT...LON 4471 10774 4470 10768 4469 10769 4468 10767
      4469 10765 4465 10753 4463 10752 4464 10749
      4461 10747 4425 10784 4445 10851 4489 10831
TIME...MOT...LOC 0214Z 207DEG 21KT 4450 10839 4436 10790

21
Special weather statement, May 9, 11:07 PM MDT, 2 hours 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1107 PM MDT MON MAY 9 2016

WYZ020-100600-
NATRONA COUNTY LOWER ELEVATIONS-
1107 PM MDT MON MAY 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL NATRONA COUNTY UNTIL
MIDNIGHT MDT...

AT 1103 PM MDT...DOPPLER RADAR WAS TRACKING A FEW THUNDERSTORMS
NEAR POWDER RIVER...WHICH IS 35 MILES WEST OF CASPER...MOVING EAST AT
25 MPH.

THE MAIN HAZARDS FROM THIS ACTIVITY WILL BE BRIEF HEAVY RAINFALL
AND SMALL HAIL.

THROUGH 1145 PM MDT...THESE THUNDERSTORMS WILL IMPACT AREAS BETWEEN
NATRONA AND POWDER RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD
TO PONDING OF WATER ON HIGHWAY 26...AS WELL AS OTHER RURAL
ROADS. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4287 10651 4289 10719 4291 10721 4291 10725
      4289 10725 4289 10729 4315 10711 4318 10653
TIME...MOT...LOC 0503Z 270DEG 21KT 4301 10700

21
Special weather statement, May 9, 11:57 PM MDT, 1 hour 35 minutes before
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Special weather statement, May 10, 12:58 AM MDT, 34 minutes before
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Special weather statement, May 10, 1:20 AM MDT, 12 minutes before
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Special weather statement, May 10, 1:32 AM MDT, 0 minutes before
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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, 8:02 PM MDTSpecial Weather StatementRIWJohnson43 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, 1:56 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.