A slow moving upper-level low crossing Colorado, an unusually cool air mass, and persistent most easterly flow brought heavy snow to portions of central and southwest Wyoming. The highest amounts fell in the favored upslope locations from the Wind River Range, east along US Highway 287, and on to Casper.
Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS RIW wrote it up.
A slow moving upper-level low crossing Colorado, an unusually cool air mass, and persistent most easterly flow brought heavy snow to portions of central and southwest Wyoming. The highest amounts fell in the favored upslope locations from the Wind River Range, east along US Highway 287, and on to Casper. Snowfall of six to ten inches was common in many locations within this favored area. The highest amount measured was 19.7 inches at Sweetwater Station. In Rock Springs and Green River, four to six inches of heavy, wet snow caused many limbs to break off of trees which caused scattered power outages. A CoCoRaHS observer near higher terrain south of Rock Springs measured 14.5 inches of snow.
The local office's own words before the first event, 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 the first event at Apr 25, 2:48 PM MST, 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 348 PM MDT MON APR 25 2016 .SHORT TERM...TONIGHT THROUGH THURSDAY ANOTHER COLD AND WET STORM SYSTEM IS TAKING AIM ON WYO COUNTRY THIS AFTERNOON...ESPECIALLY FOR AREAS EAST OF THE DIVIDE TONIGHT THROUGH AT LEAST TUESDAY. A LITTLE LONGER IN THE ERN ZONES. PCPN WILL BECOME WIDESPREAD ACROSS MUCH OF CENTRAL WYOMING BY THE EVENING HOURS AND ACROSS MOST OF THE WEST...ESPECIALLY IN AND NEAR THE MTNS. AS THE LOW DRAWS CLOSER...CYCLONICALLY CURVED NOSE OF THE JET PROVIDES STRONG FORCING BY THIS EVENING IN THE CENTRAL ZONES ALONG WITH INCREASING QG FORCING AND UPGLIDE NORTH OF THE FRONT. PCPN COULD BE QUITE HEAVY DURING THE EVENING HOURS WITH FALLING TEMPS. IT LOOKS LIKE THE RAIN HAS A DECENT CHANCE TO TURN OVER IN LANDER FOOTHILLS SHORTLY AFTER MIDNIGHT AS UPSLOPE DEEPENS...PCPN INCREASES AND COLD AIR DAMMING SIGNATURE SHOWS UP. WINTER STORM WATCH FOR THERE WILL BE UPGRADED WITH THE AFTN PACKAGE TO A WARNING STARTING AT MIDNIGHT. THE WIND RIVER MTNS SHOULD SEE WIDESPREAD SNOW BY EARLY THIS EVENING SO WILL UPGRADE THEM TO A WARNING STARTING AT 6 PM. IT LOOKS LIKE IT WILL TAKE A WHILE LONGER FOR THE GREEN MTNS/RATTLESNAKE RANGE AND CPR MTN TO CHANGE OVER SO DELAYING THE HIGHLIGHT UNTIL MIDNIGHT BUT WILL STILL UPGRADE TO A WARNING...JUST 6 HOURS LATER. FOR THE BIGHORNS...WE ARE THINKING A WINTER WEATHER ADVISORY WILL SUFFICE WITH WIDESPREAD 6 TO 12 INCHES EAST OF THE DIVIDE AND LESS WEST. COULD BE SOME LOCAL AREAS OVER A FOOT BUT WITH LOW FAR ENOUGH SOUTH...THINKING IS MOST AREAS WILL NOT SEE OVER A FOOT. OTHER LOWER ELEVATION ZONES MAY NEED ADVISORIES FOR TUESDAY LIKE THE WIND RIVER BASIN AND OWL CREEKS AND FOR CASPER AND POSSIBLY JOHNSON COUNTY FROM TUE/TUE MID-MORNING THROUGH TUE NGT (AND POSSIBLY LONGER). STILL A CHANCE OF MORE SIGNIFICANT SNOW IN CPR BUT LEANING ADVISORY RIGHT NOW WITH INITIAL ELY FLOW. STILL NEEDS TO BE WATCHED VERY CLOSELY. NEXT SHIFT CAN LOOK AT THIS ONE MORE TIME AND DECIDE IF A SHORT NOTICE WATCH SHOULD BE ISSUED THIS EVENING AND THEN UPGRADED BY TUE MORNING OR IF AN ADVISORY WILL SUFFICE. TOUGH CALL. ALSO MAY NEED ERN SWEETWATER COUNTY IN AN ADVISORY FOR TUE. COMBINATION OF JET SUPPORT...QG FORCING...UPGLIDE TO START US OFF ALONG WITH A GOOD UPSLOPE COMPONENT ARE LIKELY TO MAKE THIS YET ANOTHER SIGNIFICANT STORM. STORM SLOWS DOWN OVER NEBRASKA ON WED AND THAT WILL HAVE TO BE WATCHED ONCE THE PCPN/SNOW GETS GOING IN OUR ERN ZONES. HOW LONG WILL IT CONTINUE AND AT WHAT INTENSITY. LONGER DURATION ADVISORY FOR JOHNSON AND NATRONA OR ??. WE'LL BE WATCHING IT CLOSELY. NOT MUCH BREAK IN BETWEEN THIS SYSTEM AND ANOTHER CLOSED LOW OVER THE DESERT SW THURSDAY. A WESTWARD MOVING SHORTWAVE WED NGT AND THU MAY SPREAD SOME LIGHT PCPN WESTWARD INTO CENTRAL AND WRN WYOMING WED NGT AND THURSDAY MORNING BEFORE AFTERNOON CONVECTION DEVELOPS WITH OUR COOL...UNSTABLE AIRMASS IN THE WEST ESPECIALLY THURSDAY AFTN. QUITE THE BUSY AND CHALLENGING FORECAST ONCE AGAIN! .LONG TERM...THURSDAY NIGHT THROUGH MONDAY NOT MUCH CHANGE FROM THE PREVIOUS LONG TERM FORECAST..SEE PREVIOUS DISCUSSION BELOW. JUST MINOR UPDATES WITH CONSENSUS OF LATEST GUIDANCE. INCLEMENT WEATHER WITH BELOW AVERAGE TEMPERATURES CONTINUES THROUGH THE EXTENDED...BUT NOT AS IMPACTFUL AS WHAT WILL OCCUR DURING THE SHORT TERM. BY THURSDAY MORNING...GLOBAL MODELS SHOW YET ANOTHER UPPER LEVEL LOW OVER THE SOUTHERN GREAT BASIN REGION. THIS FEATURE IS EXPECTED TO PUSH INTO THE DESERT SOUTHWEST/ARIZONA ON THURSDAY. AT THE SAME TIME...SOME SHEARED ENERGY FROM THE UPPER LOW THAT IMPACTS THE AREA TUESDAY/EARLY WEDNESDAY...IS PROGGED TO RETROGRADE WEST ACROSS MONTANA. FORCING LOOKS TO BE WEAK THURSDAY...BUT ENOUGH MOISTURE AROUND FOR CONTINUATION OF SLIGHT VALLEY/CHANCE MTN POPS FOR NOW. PRECIPITATION TYPE WILL BE MOUNTAIN SNOW AND MIX OF RAIN/SNOW IN THE VALLEYS. ON FRIDAY...MODELS SHOW THE UPPER LOW EJECTING NORTHEAST INTO EASTERN COLORADO...BUT THIS UPPER LOW IS PROGGED TO BE WEAKER AND A BIT FARTHER SOUTH THAN THE UPPER LOWS THAT IMPACTED THE AREA YESTERDAY...AND THE ONE ON TUESDAY. THE BEST SHOT AT PRECIPITATION WILL PROBABLY BE ACROSS THE FAR EAST/SOUTHEAST WHERE THE INFLUENCE OF THE UPPER LOW WOULD BE THE GREATEST...AS WELL AS A MOIST LOW LEVEL EASTERLY UPSLOPE FLOW. THE 00Z ECMWF KEEPS THE UPPER LOW FARTHER SOUTH WITH A DRIER SOLUTION FRIDAY. MODELS THEN SHOW ANOTHER UPPER LOW DIVING FROM THE PACIFIC NORTHWEST...SOUTHEAST INTO NEVADA SATURDAY. AT THE SAME TIME...THE 00Z GFS TRIES TO RETROGRADE SOME ENERGY FROM THE UPPER LOW ON FRIDAY BACK INTO THE FORECAST AREA...WHILE THE ECMWF PUSHES ALL THE ENERGY ASSOCIATED WITH THE UPPER LOW INTO THE MISSOURI VALLEY. THE AFOREMENTIONED UPPER LOW IN NEVADA SATURDAY THEN PUSHES INTO ARIZONA SUNDAY AND REMAINS ACROSS ARIZONA/FOUR CORNERS REGION THROUGH MONDAY. WILL KEEP LOW END PRECIPITATION CHANCES SATURDAY THROUGH MONDAY WITH THIS ACTIVE PATTERN. && .AVIATION.../00Z ISSUANCE/ COMPLEX STORM SYSTEM CONTINUES THIS EVENING WITH THE UPPER LEVEL LOW TO THE SOUTHWEST IN UTAH. WYOMING IS CURRENTLY SEEING SOUTHERLY MID LEVEL FLOW OVERRIDING NORTHERLY SURFACE FLOW ACROSS NORTHERN AND CENTRAL PARTS OF THE STATE. INSTABILITY HAS BROUGHT WEAK THUNDERSTORMS...WHICH HAVE PRODUCED BB TO PEA SIZE HAIL ALONG WITH BRIEF HEAVY RAIN. MVFR TO IFR CONDITIONS AROUND AND UNDER THESE STORMS WILL CONTINUE INTO THE EVENING. EXPECTING AREAS OF MODERATE RAIN TO DEVELOP ACROSS CENTRAL WYOMING DURING THE EVENING AND OVERNIGHT HOURS...WITH A FEW LOCATIONS TURNING OVER TO SNOW AFTER MIDNIGHT...AND OTHERS TURNING TO SNOW AROUND 12Z. TUESDAY LOOKS TO BE A LONG DURATION PRECIPITATION EVENT...WITH HEAVY WET SNOW ACROSS CENTRAL WYOMING IN MOSTLY NORTHERLY SURFACE FLOW. HIGHER TERRAIN WILL BE OBSCURED FOR THE NEXT 36 TO 48 HOURS...WITH THE SNOW LEVEL OF 8-9K FT DROPPING TO 5-6K FT BY TUESDAY EVENING. LLWS A POSSIBILITY ALSO ACROSS CENTRAL WYOMING. CONDITIONS LOOK TO IMPROVE TUESDAY AFTER 18Z AROUND KJAC...YET NOT SPREAD EASTWARD TO REST OF TAF SITES UNTIL 12Z WED. && .FIRE WEATHER... ANOTHER WET AND COLD STORM SYSTEM WILL BRING SIGNIFICANT PRECIPITATION...BOTH RAIN AND SNOW...TO THE AREA THROUGH TUESDAY AND IN THE EASTERN SECTIONS THROUGH WEDNESDAY. A CHANCE OF SHOWERS AND A FEW THUNDERSTORMS WILL ALSO BE AROUND ON THURSDAY. THE FAR NORTHWEST CORNER WILL SEE THE LIGHTEST PRECIPITATION WHILE THE CENTRAL ZONES SEE THE HEAVIEST ALONG WITH SIGNIFICANT SNOWFALL. && .RIW WATCHES/WARNINGS/ADVISORIES... WINTER STORM WARNING FROM MIDNIGHT TONIGHT TO 6 AM MDT WEDNESDAY FOR WYZ022. WINTER STORM WARNING FROM MIDNIGHT TONIGHT TO MIDNIGHT MDT TUESDAY NIGHT FOR WYZ019. WINTER STORM WARNING FROM MIDNIGHT TONIGHT TO 6 PM MDT TUESDAY FOR WYZ018. WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO MIDNIGHT MDT TUESDAY NIGHT FOR WYZ008-009. WINTER STORM WARNING FROM 6 PM THIS EVENING TO MIDNIGHT MDT TUESDAY NIGHT FOR WYZ015. && SHORT TERM...SKRBAC LONG TERM...MCDONALD/MURRELL AVIATION...MCDONALD FIRE WEATHER...SKRBAC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 156 PM MDT MON APR 25 2016 WYZ001>020-022>030-261200- 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- 156 PM MDT MON APR 25 2016 ...WINTER STORM WARNINGS AND WINTER WEATHER ADVISORIES ARE IN EFFECT FOR MUCH OF CENTRAL WYOMING TONIGHT THROUGH AT LEAST TUESDAY EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS WITH SMALL HAIL WILL CONTINUE INTO THE EVENING HOURS...ESPECIALLY ACROSS THE SOUTH AND CENTRAL SECTIONS. SNOWFALL WILL DEVELOP OVER THE CENTRAL MOUNTAINS THIS EVENING AND WILL BE HEAVY AT TIMES AS IT CONTINUES TUESDAY. WINTER WEATHER HIGHLIGHTS COVER MOST OF THE MOUNTAINS AND FOOTHILLS OF CENTRAL WYOMING BEGINNING TONIGHT AND CONTINUING THROUGH AT LEAST TUESDAY EVENING. SEE THE LATEST WINTER WEATHER STATEMENT FOR DETAILS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY TUESDAY...SIGNIFICANT SNOWFALL WILL CONTINUE ACROSS THE MOUNTAIN AREAS PREVIOUSLY MENTIONED. SNOWFALL WILL ALSO DEVELOP ACROSS THE LOWER ELEVATIONS BEGINNING TUESDAY MORNING...AND COULD BE SIGNIFICANT IN SOME AREAS SUCH AS CASPER...LANDER FOOTHILLS AND JOHNSON COUNTY. WEDNESDAY AND THURSDAY...SHOWERS WILL LINGER ACROSS THE AREA AS LOW PRESSURE REMAINS THE PRIMARY INFLUENCE. THESE SHOWERS LOOK MOST FAVORABLE TO IMPACT THE NORTHERN TWO THIRDS OF THE STATE. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY STRONG WIND...HAIL...OR HEAVY RAIN ASSOCIATED WITH THUNDERSTORMS TODAY. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
224 PM MDT MON APR 25 2016
WYZ017-018-252100-
WIND RIVER BASIN-LANDER FOOTHILLS-
224 PM MDT MON APR 25 2016
...SPECIAL WEATHER STATEMENT...
AT 219 PM MDT...DOPPLER RADAR WAS TRACKING A THUNDERSTORM OVER
LANDER...MOVING NORTH NORTHWEST AT 15 MPH.
PEA SIZE HAIL ALONG WITH BRIEF HEAVY RAINFALL WILL BE POSSIBLE WITH
THIS STORM.
THIS STRONG THUNDERSTORM WILL BE NEAR...
HUDSON AROUND 240 PM MDT.
ETHETE AROUND 300 PM MDT.
OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE RIVERTON
REGIONAL AIRPORT AND THE LANDER GOLF COURSE.
LAT...LON 4315 10885 4305 10833 4275 10863 4282 10886
4286 10889 4287 10891 4288 10891
TIME...MOT...LOC 2019Z 196DEG 14KT 4285 10872
LIPSONSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 225 PM MDT MON APR 25 2016 WYZ020-261000- NATRONA COUNTY LOWER ELEVATIONS- INCLUDING THE CITY OF...CASPER 225 PM MDT MON APR 25 2016 WIDESPREAD RAIN IS EXPECTED TO DEVELOP TONIGHT AND AS COLDER AIR FILTERS IN...THE RAIN MAY CHANGE TO SNOW TUESDAY MORNING. THUNDERSTORMS WITH SMALL HAIL CAN ALSO BE EXPECTED THROUGH THIS EVENING. IT COULD THEN SNOW OFF AND ON THROUGH TUESDAY NIGHT OR EVEN WEDNESDAY...POSSIBLY MIXED WITH RAIN AT TIMES. THERE IS SOME UNCERTAINTY TO WHEN THE RAIN MAY CHANGE OVER TO SNOW AND HOW LONG IT WILL LAST. THERE IS STILL THE POTENTIAL FOR SIGNIFICANT SNOW AROUND CASPER AND THE LOWER ELEVATIONS OF NATRONA COUNTY. EARLY INDICATIONS POINT TO BETWEEN 3 AND 6 INCHES TUESDAY INTO WEDNESDAY WITH LOCALLY HIGHER AMOUNTS NEAR CASPER MOUNTAIN AND TOWARDS HILAND AND WALTMAN. EVEN HIGHER AMOUNTS ARE POSSIBLE AROUND THE REGION SO STAY TUNED FOR MORE UPDATES ON THIS NEXT MAJOR STORM SYSTEM. WYZ017-261000- WIND RIVER BASIN- INCLUDING THE CITIES OF...RIVERTON...SHOSHONI 225 PM MDT MON APR 25 2016 WIDESPREAD RAIN IS EXPECTED TO DEVELOP TONIGHT AND AS COLDER AIR FILTERS IN...THE RAIN WILL LIKELY CHANGE TO SNOW IN MOST AREAS AROUND SUNRISE TUESDAY MORNING. THUNDERSTORMS WITH SMALL HAIL ARE ALSO EXPECTED THROUGH THIS EVENING. IT COULD THEN SNOW OFF AND ON THROUGH TUESDAY EVENING...POSSIBLY MIXED WITH RAIN AT TIMES. THERE IS SOME UNCERTAINTY TO WHEN THE RAIN MAY CHANGE OVER TO SNOW AND HOW LONG IT WILL LAST. EARLY INDICATIONS POINT TO BETWEEN 2 AND 5 INCHES OF SNOW ON TUESDAY WITH LOCALLY HIGHER AMOUNTS. STAY TUNED FOR MORE UPDATES ON THIS NEXT STORM SYSTEM. WYZ010-011-261000- NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY- INCLUDING THE CITIES OF...BUFFALO...KAYCEE 225 PM MDT MON APR 25 2016 WIDESPREAD RAIN IS EXPECTED TO DEVELOP TONIGHT AND AS COLDER AIR FILTERS IN...THE RAIN MAY CHANGE TO SNOW TUESDAY MORNING. THUNDERSTORMS WITH SMALL HAIL CAN ALSO BE EXPECTED THROUGH THIS EVENING. IT COULD THEN SNOW OFF AND ON THROUGH TUESDAY NIGHT OR EVEN WEDNESDAY...POSSIBLY MIXED WITH RAIN AT TIMES. THERE IS SOME UNCERTAINTY TO WHEN THE RAIN MAY CHANGE OVER TO SNOW AND HOW LONG IT WILL LAST. THERE IS STILL THE POTENTIAL FOR SIGNIFICANT SNOW AROUND THE LOWER ELEVATIONS OF JOHNSON COUNTY. EARLY INDICATIONS POINT TO BETWEEN 3 AND 5 INCHES OF SNOW TUESDAY INTO WEDNESDAY WITH LOCALLY HIGHER AMOUNTS NEAR THE MOUNTAINS. STAY TUNED FOR MORE UPDATES ON THIS NEXT MAJOR STORM SYSTEM. WYZ007-261000- OWL CREEK AND BRIDGER MOUNTAINS- 225 PM MDT MON APR 25 2016 WIDESPREAD RAIN IS EXPECTED TO DEVELOP TONIGHT AND AS COLDER AIR FILTERS IN...THE RAIN WILL CHANGE TO SNOW OVERNIGHT. THUNDERSTORMS WITH SMALL HAIL CAN ALSO BE EXPECTED THROUGH THIS EVENING. IT COULD THEN SNOW OFF AND ON THROUGH TUESDAY NIGHT OR EVEN WEDNESDAY. EARLY INDICATIONS POINT TO BETWEEN 5 AND 9 INCHES OF SNOW EARLY TUESDAY MORNING THROUGH TUESDAY NIGHT WITH SOME SNOW STILL POSSIBLE ON WEDNESDAY ACROSS THE OWL CREEK AND BRIDGER MOUNTAINS. STAY TUNED FOR MORE UPDATES ON THIS NEXT STORM SYSTEM. WYZ030-261000- EAST SWEETWATER COUNTY- INCLUDING THE CITY OF...WAMSUTTER 225 PM MDT MON APR 25 2016 WIDESPREAD SHOWERS WITH SOME THUNDERSTORMS WITH SMALL HAIL WILL CONTINUE THROUGH THIS EVENING WITH RAIN POSSIBLY CHANGING OVER TO SNOW BY TUESDAY MORNING. SNOW WILL LIKELY CONTINUE AT TIMES THROUGH THE DAY TUESDAY BEFORE DECREASING. THERE IS STILL SOME UNCERTAINTY ON HOW MUCH SNOWFALL WILL OCCUR BUT EARLY INDICATIONS POINT TO BETWEEN 2 AND 4 INCHES WITH SOME OF THE HIGHER ELEVATIONS AND NORTHERN PORTIONS RECEIVING 5 INCHES OR MORE. STAY TUNED FOR MORE UPDATES ON THIS NEXT STORM SYSTEM. TEAM RIVERTON
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
250 PM MDT MON APR 25 2016
WYZ014-025-252130-
WIND RIVER MOUNTAINS WEST-UPPER GREEN RIVER BASIN FOOTHILLS-
250 PM MDT MON APR 25 2016
...SPECIAL WEATHER STATEMENT...
AT 247 PM MDT...DOPPLER RADAR WAS TRACKING A THUNDERSTORM NEAR
PINEDALE...MOVING NORTH AT 15 MPH.
PEA SIZE HAIL AND BRIEF HEAVY RAINFALL WILL BE POSSIBLE WITH THIS
STORM.
THIS STRONG THUNDERSTORM WILL BE NEAR...
DANIEL AROUND 255 PM MDT.
CORA AROUND 305 PM MDT.
WILLOW LAKE AROUND 320 PM MDT.
NEW FORK LAKE AND WARREN BRIDGE AROUND 330 PM MDT.
OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE THE NARROWS
CAMPGROUND...WILLOW LAKE CAMPGROUND... RENDEZVOUS MEADOWS GOLF
COURSE...NEW FORK LAKES CAMPGROUND AND NEW FORK CAMPGROUND.
LAT...LON 4308 11021 4315 10985 4283 10979 4279 10999
4284 11007
TIME...MOT...LOC 2047Z 164DEG 13KT 4288 10994
LIPSONSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 307 PM MDT MON APR 25 2016 WYZ007-009-017-019-020-252145- GREEN MOUNTAINS AND RATTLESNAKE RANGE-OWL CREEK AND BRIDGER MOUNTAINS-WIND RIVER BASIN-NATRONA COUNTY LOWER ELEVATIONS-BIGHORN MOUNTAINS SOUTHEAST- 307 PM MDT MON APR 25 2016 ...SPECIAL WEATHER STATEMENT... AT 304 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR MONETA TO 10 MILES NORTH OF ICE SLOUGH...AND MOVING EAST AT 15 MPH. PEA SIZE HAIL AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH THESE STORMS. THESE STORMS WILL REMAIN OVER MAINLY RURAL AREAS OF EAST CENTRAL FREMONT AND NORTHWESTERN NATRONA COUNTIES. THESE STORMS WILL AFFECT HIGHWAY 20/26 FROM A FEW MILES WEST OF MONETA EAST TO HIGHLAND THROUGH 245 PM. LAT...LON 4338 10714 4266 10773 4266 10810 4334 10803 TIME...MOT...LOC 2104Z 297DEG 13KT 4312 10765 4266 10801 LIPSON
The national radar mosaic for the moment the first event began.
6 winter storm. Local standard time, as filed.
Heavy snow fell throughout the eastern slopes of the Wind River Range. The highest snowfall amount was 20 inches at the Townsend Creek SNOTEL. Snowfall in Sinks Canyon was around 15 inches.
Heavy snow fell throughout the Green and Rattlesnake Ranges. Some of the highest snowfall amounts included 19.7 inches at Sweetwater Station and 12 inches at Jeffrey City.
Anywhere from 4 to 7 inches of new snow fell around Rock Springs, with snowfall over one foot south-southeast of town. The heavy, wet snow caused limbs to break off of trees and caused power outages for some locations during the storm.
Trained spotters measured snowfall of around 12 inches on Casper Mountain.
While heavy snow did not fall in the town of Lander, there were amounts topping six inches in areas along the Middle Fork of the Popo Agie River toward Sinks Canyon.
Snowfall of 10.1 inches was measured near the airport in Casper. Around the city of Casper, amounts ranged from 6 to 10 inches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2016Every state in 2016This day in weather historyWarnings in Wyoming, April 2016
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 624005, 624006, 624011, 624007, 624008, 624009.