A slow-moving thunderstorm developed over the Bighorn Range and stalled across central Johnson County for a few hours on the evening of Friday, April 24. Hail up to penny size accumulated to a depth of several inches, including on Interstate 25 where travel was slowed to a crawl.
Every event with a place to put it. 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 thunderstorm developed over the Bighorn Range and stalled across central Johnson County for a few hours on the evening of Friday, April 24. Hail up to penny size accumulated to a depth of several inches, including on Interstate 25 where travel was slowed to a crawl.
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 24, 1:36 PM MST, 5 hours 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 236 PM MDT FRI APR 24 2015 .SHORT TERM...TONIGHT THROUGH SATURDAY GENTLE RIDGING OVR WY...WITH PRE-TROF DIVERGENCE BEGINNING TO SPREAD INTO THE SWRN PORTION OF THE STATE WITH A WEAK DISTURBANCE...JUST AHEAD OF ANOTHER SW (OVR NRN NV ATTM) TROF EJECTING OUT AHEAD OF MAIN TROF ORIENTED ALONG THE W CST...WITH CLOSED LOW CENTERED OVR SRN BC. SFC SHOWS BROAD AREA OF LOW P AND A WEAK TROF E OF THE ROCKIES AND OVR THE HIGH PLAINS OF WY...CO...AND INTO WRN SD AND NE. FRONTS STRETCH FROM SWRN SD TO NERN WY AND ON UP INTO CNTRL MT...WITH A COLD FRONT EXTENDING FROM CNTRL MT TO THE SW AND INTO NV. CURRENTLY BEST LIFT AND INSTABILITY OCCURRING OVR THE SWRN FA...WITH SHOWERS AND ISOLATED THUNDER BEGINNING ONCE AGAIN ACROSS SRN LINCOLN AND WRN SWEETWATER COUNTIES. COVERAGE OF STORMS WILL INCREASE THIS AFTERNOON WITH LOW-TOPPED -TSRA MIXING WITH SCATTERED SHRA. GENERALLY A LITTLE LOWER BUOYANCY TODAY...WITH CAPE VALUES REMAINING BELOW 400 J/KG. ALSO...MOST UNSTABLE AXIS WILL BE LOCATED E OF THE FA. STRONGER STORMS OF THE DAY LIKELY IN NORTHERN JOHNSON COUNTY. HOWEVER...BETTER MOISTURE OVR THE SWRN FA WILL CONTINUE FEED THIS AREA THRU THE AFTERNOON AND INTO THIS EVENING. THE DEW POINT SPREAD DOES NOT LOOK AS GOOD AS YESTERDAY FOR MOST LOCATIONS...WITH GUST POTENTIAL HOPEFULLY REMAINING ON THE LOWER SIDE AT LESS THAN 30 MPH. THE NEXT DISTURBANCE ARRIVES LATER THIS EVENING...INCREASING SHOWERS WITH SNOWFALL BEGINNING ABOVE 10000 FT BY MID EVENING...DECREASING TO AROUND 7500 FEET AFTER MID-NIGHT. AFTER A RESPITE FROM MOST PRECIP THRU THE REST OF THE MORNING HRS FOR MOST LOCATIONS SAVE THE SW AND NW FA...THE FIRST OF A COUPLE OF FRONTS WILL BEGIN TO PUSH SWD SAT MORNING E OF THE DIVIDE...AS MODERATELY MOIST MID/UPR FLOW STARTS TO OVER-RIDE THE FRONT FROM THE SOUTH AND BETTER MID/UPR DYNAMICS FEED INTO THE REGION ALONG WITH A WEAK JET STREAK BY SAT AFTERNOON. AT THE SAME TIME...THERE ARE HINTS AT SOME FORM OF CYCLOGENESIS GOING ON ACROSS SERN WY...WHICH MAY EFFECT THE ERN CWA LATER. OTHERWISE...WIDELY SCATTERED TO SCATTERED AREAS OF PRECIP WITH RAIN SHOWERS AND ISOLATED THUNDER WILL OCCUR AGAIN ACROSS MOST OF THE SRN HALF OF THE FA...IN ADDITION TO THOSE OVR THE WRN MOUNTAINS. WHILE MOISTURE WILL BE DECENT OVERALL...WARM TEMPS TO BEGIN WITH AND THE TIME IT TAKES TO LOWER TEMPS AND SLOW LEVELS WILL KEEP OVERNIGHT CONVECTIVE MOUNTAIN SNOWFALL RANGING FROM 1 TO 3 INCHES WITH ISOLATED PEAKS ABOVE 95000 FEET RECEIVING 4 TO 5 INCHES. SATURDAY. ONLY ANOTHER INCH OR SO WILL BE ADDED TO THIS TOTAL THRU THE DAY. .LONG TERM...SATURDAY NIGHT THROUGH FRIDAY A DIGGING TROUGH STARTS OFF THE FORECAST PERIOD...WITH PRECIPITATION SPREADING ACROSS MUCH OF CENTRAL AND WESTERN WYOMING. MODELS INDICATE SOME MODEST INSTABILITY SATURDAY EVENING...WITH PERHAPS AN ISOLATED THUNDERSTORM OR TWO LINGERING INTO THE EVENING HOURS. PRECIPITATION ASSOCIATED WITH THIS TROUGH WILL LINGER ACROSS THE STATE AS THE SYSTEM PROGRESSES EASTWARD ON SUNDAY...WITH MOST ACTIVITY EXPECTED TO BE FOUND OVER THE EASTERN HALF OF THE STATE. CONDITIONS WILL BEGIN TO IMPROVE MONDAY AFTERNOON AND ESPECIALLY MONDAY NIGHT AS A RIDGE WORKS TO BUILD OVER THE AREA. THE RIDGE WILL CONTINUE TO AMPLIFY TUESDAY WITH WIDESPREAD DRY CONDITIONS EXPECTED ACROSS THE FORECAST AREA. DRY CONDITIONS WILL GENERALLY PERSIST THROUGH WEDNESDAY...THOUGH A WEAK DISTURBANCE ACROSS NORTHWESTERN WYOMING MAY INTRODUCE A FEW SHOWERS ACROSS THE IMPACTED AREA. SHOWER COVERAGE WILL INCREASE THURSDAY...AS CONTINUED MOISTURE AND INSTABILITY REMAINS OVER PORTIONS OF WESTERN WYOMING. SOME THUNDERSTORM ACTIVITY WILL BE POSSIBLE. MODELS AT THIS TIME VARY CONCERNING THE PLACEMENT OF THE OFFENDING LOW PRESSURE SYSTEM...AND CONSEQUENTLY THE COVERAGE OF ASSOCIATED SHOWER ACTIVITY. THE ECMWF SPREADS PRECIPITATION ACROSS MUCH OF THE FORECAST AREA BY FRIDAY AFTERNOON. THE GFS...MEANWHILE...REMAINS MORE CONSERVATIVE...WITH SHOWERS PRIMARILY OVER THE NORTHWESTERN CORNER OF THE STATE. && .AVIATION.../00Z ISSUANCE/ EAST OF THE DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL ROUTES VFR CONDITIONS WILL PREVAIL THROUGH THE FORECAST PERIOD. HOWEVER...TERMINALS LOCATED ADJACENT TO MOUNTAINS THIS EVENING WILL SEE VCNTY SHRA/TSRA ALONG WITH GUSTY VARIABLE WINDS TO G25KTS AT TIMES. AFTER 21Z...-SHRA AND -TSRA WILL OCCUR ONCE AGAIN. EXPECT OCCASIONAL TO WIDESPREAD MOUNTAIN OBSCURATIONS TO ACCOMPANY THE SHOWER ACTIVITY. WEATHER GENERALLY BECOMING INCREASINGLY MOIST AND UNSTABLE THROUGH THE REST OF THE WEEKEND. WEST OF THE DIVIDE...KBPI/KJAC/KPNA/KRKS ROUTES NEAR MVFR TO MVFR IN LOW CIGS AS SHOWERS AND ISOLATED THUNDERSTORMS MOVE ACROSS THE AREA...LASTING THROUGH EARLY THIS EVENING. LIGHT SNOW SHOWERS WILL BE POSSIBLE AFTER MIDNIGHT OVR THE MOUNTAINS NEAR KJAC AND KPNA AFTER 06Z. AFTER 09Z...VCNTY FOG POSSIBLE NEAR KPNA...BUT IMPROVING CONDITIONS LASTING THROUGH MOST OF THE REST OF THE FORECAST PERIOD AT THE OTHER TERMINALS...WITH INCREASING CHANCES FOR VCNTY SHRA/TSRA AFTER 21Z...ESPECIALLY IN THE MOUNTAINS. EXPECT OCCASIONAL TO WIDESPREAD MOUNTAIN OBSCURATIONS TO ACCOMPANY THE SHOWER ACTIVITY. WEATHER GENERALLY BECOMING INCREASINGLY MOIST AND UNSTABLE THROUGH THE REST OF THE WEEKEND. && .FIRE WEATHER... FIRE DANGER RELATIVELY LOW TODAY...REMAINING LOW THROUGH THE WEEKEND AS SEASONALLY COOL AND AND MOIST WEATHER TAKES OVER THE NEXT SEVERAL DAYS. WIDELY SCATTERED TO SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL OCCUR THIS AFTERNOON AND EVENING...THEN AGAIN LATE SATURDAY. BETTER CHANCES FOR A WETTING RAIN OR SNOW WILL BE ON SUNDAY FOR MOST AREAS AS THE MAIN DISTURBANCE ROLLS OVER THE FORECAST AREA. A WARMING AND DRYING TREND BEGINS ON MONDAY AND COULD LAST THE ENTIRE WEEK. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...BRAUN LONG TERM...BRANHAM AVIATION...BRAUN FIRE WEATHER...BRAUN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 500 AM MDT FRI APR 24 2015 WYZ001>020-022>030-251100- 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- 500 AM MDT FRI APR 24 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS POSSIBLE. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SATURDAY AND SATURDAY NIGHT...SHOWERS INCREASING FROM THE SOUTH AND WEST WITH POSSIBLY A FEW THUNDERSTORMS. HEAVY WET SNOW POSSIBLE ON MOUNTAIN PASSES ABOVE 8000 FEET IN THE WEST. SUNDAY AND SUNDAY NIGHT...WIDESPREAD RAIN AND SNOW POSSIBLE ACROSS CENTRAL AND SOUTHERN WYOMING WITH SNOW LEVELS LOWERING TO BETWEEN 6500 AND 7500 FEET. HIGHER ELEVATIONS OF INTERSTATE 80...MOUNTAIN PASSES AND FOOTHILLS MAY SEE PERIODS OF WET SNOW...SLUSHY SLICK ROADS AND LIMITED VISIBILITY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 227 PM MDT FRI APR 24 2015 WYZ012-014-015-023>027-242200- SALT RIVER AND WYOMING RANGES-SOUTH LINCOLN COUNTY-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-WIND RIVER MOUNTAINS EAST- WIND RIVER MOUNTAINS WEST- 227 PM MDT FRI APR 24 2015 THROUGH 4 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 10 TO 20 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. SNOW IS EXPECTED ABOVE 10000 FEET. WYZ018-019-028>030-242200- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-LANDER FOOTHILLS- ROCK SPRINGS AND GREEN RIVER- 227 PM MDT FRI APR 24 2015 THROUGH 4 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 15 TO 25 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 40 MPH. WYZ002-003-242200- ABSAROKA MOUNTAINS-CODY FOOTHILLS- 227 PM MDT FRI APR 24 2015 THROUGH 4 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ARE DEVELOPING. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 15 TO 25 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. SNOW IS EXPECTED ABOVE 9500 FEET. WYZ010-011-242200- NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY- 227 PM MDT FRI APR 24 2015 THROUGH 4 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 10 TO 20 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. JB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 351 PM MDT FRI APR 24 2015 WYZ012>015-023>027-250000- JACKSON HOLE-SALT RIVER AND WYOMING RANGES-SOUTH LINCOLN COUNTY- STAR VALLEY-TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-WIND RIVER MOUNTAINS EAST- WIND RIVER MOUNTAINS WEST- 351 PM MDT FRI APR 24 2015 THROUGH 6 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 10 TO 20 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...VERY SMALL HAIL...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. SNOW IS EXPECTED ABOVE 10000 FEET. WYZ018-019-028>030-250000- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-LANDER FOOTHILLS- ROCK SPRINGS AND GREEN RIVER- 351 PM MDT FRI APR 24 2015 THROUGH 6 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 15 TO 25 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 40 MPH. WYZ001>003-007-250000- ABSAROKA MOUNTAINS-CODY FOOTHILLS-OWL CREEK AND BRIDGER MOUNTAINS- YELLOWSTONE NATIONAL PARK- 351 PM MDT FRI APR 24 2015 THROUGH 6 PM...ISOLATED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 15 TO 25 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...VERY SMALL HAIL...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. SNOW IS EXPECTED ABOVE 9500 FEET. WYZ009>011-020-022-250000- BIGHORN MOUNTAINS SOUTHEAST-CASPER MOUNTAIN- NATRONA COUNTY LOWER ELEVATIONS-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- 351 PM MDT FRI APR 24 2015 THROUGH 6 PM...ISOLATED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 10 TO 20 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN... VERY SMALL HAIL...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. WYZ016-017-250000- UPPER WIND RIVER BASIN-WIND RIVER BASIN- 351 PM MDT FRI APR 24 2015 THROUGH 6 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 10 TO 20 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. JB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 507 PM MDT FRI APR 24 2015 WYZ001-012>015-023>027-250010- JACKSON HOLE-SALT RIVER AND WYOMING RANGES-SOUTH LINCOLN COUNTY- STAR VALLEY-TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-WIND RIVER MOUNTAINS EAST- WIND RIVER MOUNTAINS WEST-YELLOWSTONE NATIONAL PARK- 507 PM MDT FRI APR 24 2015 THROUGH 6 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 10 TO 20 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...VERY SMALL HAIL...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 45 MPH. SNOW IS EXPECTED ABOVE 8000 FEET. HOWEVER...ROADS OVER MOUNTAIN PASSES ARE EXPECTED TO REMAIN MAINLY WET THIS EVENING. WYZ018-019-028>030-250010- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-LANDER FOOTHILLS- ROCK SPRINGS AND GREEN RIVER- 507 PM MDT FRI APR 24 2015 THROUGH 6 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE EAST NORTHEAST AT 10 TO 15 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 40 MPH. WYZ002-003-007-250010- ABSAROKA MOUNTAINS-CODY FOOTHILLS-OWL CREEK AND BRIDGER MOUNTAINS- 507 PM MDT FRI APR 24 2015 THROUGH 6 PM...ISOLATED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 15 TO 25 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...VERY SMALL HAIL...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 40 MPH. SNOW IS EXPECTED ABOVE 9000 FEET. WYZ009>011-020-022-250010- BIGHORN MOUNTAINS SOUTHEAST-CASPER MOUNTAIN- NATRONA COUNTY LOWER ELEVATIONS-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- 507 PM MDT FRI APR 24 2015 THROUGH 6 PM...ISOLATED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE EAST AT AROUND 10 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN... VERY SMALL HAIL...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 40 MPH. WYZ016-017-250010- UPPER WIND RIVER BASIN-WIND RIVER BASIN- 507 PM MDT FRI APR 24 2015 THROUGH 6 PM...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED. THESE SHOWERS AND STORMS WILL MOVE NORTHEAST AT 10 TO 20 MPH...AND THE STRONGEST STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...OCCASIONAL LIGHTNING...AND ERRATIC WINDS GUSTING TO 30 MPH. 21
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 601 PM MDT FRI APR 24 2015 WYZ001-012>015-023>025-250130- JACKSON HOLE-SALT RIVER AND WYOMING RANGES-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN FOOTHILLS- WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 601 PM MDT FRI APR 24 2015 THROUGH 8 PM...SCATTERED RAIN AND SNOW SHOWERS WITH VERY ISOLATED THUNDERSTORMS WILL CONTINUE IMPACT WESTERN WYOMING THIS EVENING. SNOW IS EXPECTED ABOVE 8000 FEET. ROADS OVER MOUNTAIN PASSES WILL REMAIN MAINLY WET...BUT THE TOP OF TOGWOTEE PASS COULD SEE SOME SLICK AREAS. WYZ009>011-250130- BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- 601 PM MDT FRI APR 24 2015 THROUGH 8 PM...ISOLATED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED ACROSS JOHNSON COUNTY. THE STRONGEST ACTIVITY IS EXPECTED TO OCCUR ACROSS NORTHEAST JOHNSON COUNTY...NORTHEAST OF INTERSTATE 90. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO MOVE VERY SLOWLY EAST ONCE THEY DEVELOP. THE STRONGEST STORMS WILL BE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...SMALL HAIL...OCCASIONAL LIGHTNING AND WIND GUSTS TO 45 MPH. 21
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 727 PM MDT FRI APR 24 2015 WYZ009>011-250300- BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- 727 PM MDT FRI APR 24 2015 THROUGH 9 PM...ISOLATED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED ACROSS JOHNSON COUNTY. THIS ACTIVITY WILL BE MOVING VERY SLOWLY EASTWARD AT 5 TO 10 MPH. THE STRONGEST ACTIVITY WILL BE ABLE TO PRODUCE BRIEF HEAVY RAINFALL...A BUNCH OF SMALL HAIL...OCCASIONAL LIGHTNING AND WIND GUSTS TO 45 MPH. 21
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 743 PM MDT FRI APR 24 2015 WYZ011-250230- SOUTHEAST JOHNSON COUNTY WY- 743 PM MDT FRI APR 24 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL JOHNSON COUNTY UNTIL 830 PM MDT... AT 739 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A THUNDERSTORM NEAR I25 MILE MARKER 270...WHICH IS 16 MILES NORTH OF KAYCEE. THIS STORM WAS NEARLY STATIONARY. THIS STORM IS CAPABLE OF PRODUCING A PLETHORA OF SMALL SIZE HAIL...WHICH COULD ACCUMULATE ON AREA ROADWAYS INCLUDING INTERSTATE 25. THIS COULD CAUSE THE ROAD TO BECOME QUITE SLIPPERY. ALSO WINDS OF 45 MPH...INFREQUENT LIGHTNING...AND BRIEF HEAVY RAINFALL IS EXPECTED. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 271 AND 281. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4387 10676 4401 10676 4402 10654 4388 10653 TIME...MOT...LOC 0140Z 271DEG 1KT 4394 10662 MURRELL
The Riverton/Lander radar (KRIW), 177 km away, was scanning. The volume nearest the first event began at 01:45 UTC.
1 hail. Local standard time, as filed.
Penny sized hail fell across a swath of I-25 between mileposts 262 and 267. The hail accumulated to a depth of several inches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2015Every state in 2015This day in weather historyWarnings in Wyoming, April 2015
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: 566846.