Alert archive / Wyoming / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 12, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 23, 2011, 8:13 PM MDT for Fremont County, Wyoming. It was in force for 62 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
- Jun 23, 2011, 8:13 PM MDT (02:13 UTC)
- Expired
- Jun 23, 2011, 9:15 PM MDT
- In force
- 62 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
County Fremont County, WY
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 2.2 hours before the alert went out and 33 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.
- Mixed-layer CAPE
- 207 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 2783 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
668
WUUS55 KRIW 240213
SVRRIW
WYC013-240315-
/O.NEW.KRIW.SV.W.0012.110624T0213Z-110624T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
813 PM MDT THU JUN 23 2011
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL FREMONT COUNTY IN CENTRAL WYOMING...
* UNTIL 915 PM MDT
* AT 812 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR GAS HILLS RD MILE
MARKER 10...OR 11 MILES SOUTHEAST OF RIVERTON...AND MOVING EAST AT
55 MPH.
AT 803 PM MDT A 68 MPH WIND GUST WAS REPORTED AT RIVERTON AIRPORT
WITH THIS STORM.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
GAS HILLS RD MILE MARKER 20 AROUND 825 PM MDT.
GAS HILLS RD MILE MARKER 30 AROUND 835 PM MDT.
CASTLE GARDENS AROUND 845 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4244 10839 4271 10859 4286 10875 4332 10815
4299 10749 4297 10750
TIME...MOT...LOC 0213Z 284DEG 46KT 4297 10821
WIND...HAIL 70MPH <.75IN
$$
ALLEN1 follow-up statement
922
WWUS55 KRIW 240306
SVSRIW
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
906 PM MDT THU JUN 23 2011
WYC013-240316-
/O.EXP.KRIW.SV.W.0012.000000T0000Z-110624T0315Z/
FREMONT WY-
906 PM MDT THU JUN 23 2011
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FREMONT COUNTY WILL
EXPIRE AT 915 PM MDT...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA. HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.
REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4244 10839 4271 10859 4286 10875 4332 10815
4299 10749 4297 10750
TIME...MOT...LOC 0306Z 284DEG 46KT 4280 10731
$$
ALLENWhat forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 23, 2:54 PM MDT, 5 hours 19 minutes earlier.
Area forecast discussion, Jun 23, 2:54 PM MDT, 5 hours 19 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 254 PM MDT THU JUN 23 2011 .SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT CONVECTION THIS MORNING AND EARLY AFTERNOON WAS SIGNIFICANTLY ABOVE WHAT WAS PREVIOUSLY EXPECTED OR GENERATED IN THE MODELS. GOOD UPPER DIVERGENCE FROM A 6O KT JET TO THE SOUTH HAS BEEN THE MAIN DRIVING FORCE ACROSS LINCOLN...SUBLETTE...FREMONT AND NATRONA COUNTIES. HEATING TO THE NORTH HAS NOW DRIVEN CONVECTION OVER TETON AND PARK COUNTIES AND SHOULD SPREAD ACROSS THE BIG HORN BASIN...BIGHORN MOUNTAINS AND JOHNSON COUNTIES THROUGH THIS EVENING. EXPECT CONVECTION TO BE MORE WIDESPREAD ON FRIDAY AS WELL. SATURDAY SHOULD SEE MORE THAN THE MODELS ARE PRODUCING AS WELL AND HAVE INCREASED PRECIPITATION PROBABILITIES...ESPECIALLY IN THE MOUNTAINS AND NORTH. TEMPERATURES WERE COOLER UNDER THE AREA OF WIDESPREAD SHOWER AND EMBEDDED THUNDERSTORM ACTIVITY FROM WEST CENTRAL THROUGH EAST CENTRAL. THE AREAS NORTH AND SOUTH WARMED PRETTY MUCH AS EXPECTED. EXPECT DAYTIME CONVECTION FRIDAY AND SATURDAY WILL HAVE COOLING IMPACT AS WELL BUT THE LOCATION IS HARD TO DETERMINE AT THIS TIME. TEMPERATURE IMPACT ON SNOW MELT IS ADDRESSED BELOW IN THE HYDROLOGY SECTION. .LONG TERM...SUNDAY THROUGH THURSDAY SEASONABLY COOL AND UNSETTLED CONDITIONS WILL LINGER OVER THE NORTH THROUGH SUNDAY WHILE WARM AND DRY CONDITIONS PREVAIL OVER THE SOUTH. ABOVE NORMAL TEMPERATURES EXPECTED TUESDAY THROUGH THURSDAY. SLIGHT CHANCES OF LATE DAY THUNDERSTORMS WILL CONTINUE OVER NORTHERN WYOMING THROUGH THIS PERIOD. MEDIUM RANGE GLOBAL MODELS SHOWING LESS SPREAD THROUGH THIS PERIOD THAN PREVIOUS RUNS. AGREEMENT IN THE INITIAL PERIOD IN DRIFTING TAIL END OF TROUGH ACROSS THE NORTHERN ROCKIES INTO THE NORTHERN PLAINS SUNDAY WITH ASSOCIATED FRONTAL BOUNDARY PUSHING SOUTH INTO NORTH CENTRAL AND EASTERN WYOMING. BEST MOISTURE AND INSTABILITY WILL BE ALONG AND EAST OF THIS BOUNDARY WITH A DRIER WESTERLY FLOW ACROSS THE WEST AND SOUTH. AN UPPER RIDGE TRANSLATES THE NORTHERN ROCKIES ON MONDAY AS UPSTREAM TROUGH SHARPENS ALONG 130W. UNSEASONABLY WARM SW FLOW DEVELOPS TUESDAY AND WEDNESDAY BETWEEN THIS TROUGH AND STRENGTHENING RIDGE OF HIGH PRESSURE OVER THE SOUTHERN U.S. BOTH GFS AND ECMWF BRING SHORTWAVE IN SW FLOW ACROSS AREA TUESDAY NIGHT AND WEDNESDAY WITH GFS MUCH STRONGER WITH THIS FEATURE. FORECAST WEIGHTED TOWARD ECMWF WITH THIS ENERGY DAMPENING OUT MORE INTO STRONG EXPANDING RIDGE. ECMWF CONTINUES TO EXPAND HOT RIDGE ACROSS THE ROCKIES AND CENTRAL U.S. THROUGH THURSDAY WHILE GFS LOWER WITH HEIGHTS ACROSS NE PACIFIC AND NW U.S. FORECAST CONTINUES TO SIDE WITH ECMWF...ON WARMER SIDE OF GUIDANCE TEMPERATURES AND SLIGHT CHANCES OF LATE DAY THUNDERSTORMS CONFINED TO THE NORTH. && .AVIATION... SHOWERS AND THUNDERSTORMS ARE LIKELY THROUGH THE EVENING ACROSS THE NORTHERN HALF OF THE FORECAST AREA. THESE SHOWERS AND THUNDERSTORMS WILL BRING PERIODS OF MVFR CIGS AND MOUNTAIN OBSCURATIONS. STRONGER STORMS ARE POSSIBLE OVER THE NORTHERN THIRD OF THE STATE THROUGH 06Z. VFR CONDITIONS CAN BE EXPECTED AFTER 06Z WITH SHOWERS REDEVELOPING BY 14Z OVER WESTERN WYOMING. THUNDERSTORMS WILL DEVELOP AFTER 18Z FOR THE BIG HORN BASIN AND JOHNSON AND NATRONA COUNTIES. SOME OF THESE STORMS WILL BE STRONG WITH GUSTY WINDS AND HAIL. AIRPORTS AFFECTED FRIDAY INCLUDE KCOD...KWRL...KGEY...KBYG...AND KCPR. && .HYDROLOGY... THE WIND RIVER FROM DUBOIS TO RIVERTON CONTINUES TO RISE TO NEAR FLOOD STAGE. A FLOOD WATCH HAS BEEN ISSUED. THE GREEN RIVER FROM WARREN BRIDGE TO FONTENELLE CONTINUES TO RISE AND IS EXPECTED TO BE NEAR FLOOD STAGE BY TUESDAY. THE FORKS OF THE SHOSHONE CONTINUE TO RISE AS WELL. SMALL CREEKS AND HEADWATER STREAMS THAT ARE ALREADY FLOWING AT MODERATE TO HIGH LEVELS ARE EXPECTED TO RUN ABOVE BANKFULL FRIDAY THROUGH SUNDAY. WARMER MOUNTAIN TEMPERATURES TODAY WILL INCREASE SNOWMELT BELOW 10000 FEET. RUN OFF HAS BEEN BETWEEN 1.5 AND 2 INCHES FROM THIS SNOW PACK AND IS EXPECTED TO CONTINUE AROUND THIS RATE. SCATTERED THUNDERSTORMS ARE EXPECTED MAINLY ACROSS NORTHERN WYOMING THIS EVENING HOWEVER THESE STORMS WILL MOVE FAIRLY QUICKLY. ON FRIDAY...COOLER TEMPERATURES WILL PREVAIL ACROSS NORTHERN WYOMING WHILE TEMPERATURES WILL REMAIN WARM ACROSS THE SOUTH. THE BEST POTENTIAL FOR SIGNIFICANT RAIN PRODUCING THUNDERSTORMS WILL BE ACROSS NATRONA AND JOHNSON COUNTIES FRIDAY AFTERNOON AND EVENING. SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED TO BE MORE ISOLATED OVER THE WEEKEND WITH NEAR OR SLIGHTLY BELOW NORMAL TEMPERATURES ACROSS THE NORTHERN BASINS AND NEAR OR ABOVE NORMAL TEMPERATURES ACROSS THE SOUTH. && .RIW WATCHES/WARNINGS/ADVISORIES... FLOOD WATCH FROM MIDNIGHT MDT TONIGHT THROUGH LATE SATURDAY NIGHT WYZ016-017. && SHORT TERM...C.BAKER LONG TERM...AEM AVIATION...BERC FIRE WEATHER...TEAM RIVERTON HYDROLOGY...C.BAKER
Hazardous weather outlook, Jun 23, 3:30 PM MDT, 4 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 330 PM MDT THU JUN 23 2011 WYZ001>020-022>030-241104- 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- 330 PM MDT THU JUN 23 2011 ...FLOOD WATCH FOR THE WIND RIVER TONIGHT THROUGH SATURDAY NIGHT... ...FLOOD WARNING FOR THE WIND RIVER NEAR DUBOIS THROUGH NOON FRIDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS WESTERN AND CENTRAL WYOMING TODAY AND TONIGHT. A FEW OF THE STORMS COULD BECOME QUITE STRONG...PRODUCING GUSTY WINDS IN EXCESS OF 45 MPH... FREQUENT LIGHTNING...SMALL HAIL AND BRIEF VERY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... FRIDAY...ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE ACROSS THE BIG HORN BASIN...JOHNSON AND NATRONA COUNTIES...LESS INTENSE STORMS ARE POSSIBLE ELSEWHERE. EXCESSIVE SNOWMELT DUE TO WARM TEMPERATURES WILL CAUSE A RISE IN RIVER LEVEL ON THE WIND RIVER FROM DUBOIS THROUGH RIVERTON. FLOODING IS LIKELY THIS WEEKEND IN LOW LYING AREAS ADJACENT TO THE WIND RIVER. SATURDAY THROUGH TUESDAY...ISOLATED TO SCATTERED THUNDERSTORMS ACROSS NORTHERN WYOMING. CREEKS AND RIVERS WILL CONTINUE TO RUN HIGH AND SWIFT AS RECORD MOUNTAIN SNOWPACK BEGINS TO MELT MORE RAPIDLY WITH THE EXPECTED WARM-UP INTO THE WEEKEND. SOME LOCATIONS COULD DEVELOP OR CONTINUE TO EXPERIENCE MINOR FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE WEATHER AND FLOODING. THANK YOU. TEAM RIVERTON
In the hours before
Special weather statement, Jun 23, 7:20 PM MDT, 53 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 720 PM MDT THU JUN 23 2011 WYZ003-004-006-240400- CODY FOOTHILLS-NORTH BIG HORN BASIN-SOUTHEAST BIG HORN BASIN- 720 PM MDT THU JUN 23 2011 SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL PRODUCE GUSTY OUTFLOW WINDS OF 40 TO 50 MPH ACROSS THE BIG HORN BASIN THROUGH THIS EVENING. MOST OF THE SHOWERS AND STORMS WILL ONLY PRODUCE LIGHT RAINFALL. IF YOU ARE PLANNING TO BE OUTDOORS THIS EVENING BE PREPARED FOR GUSTY WIND THROUGH 10 PM.
Special weather statement, Jun 23, 7:21 PM MDT, 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
721 PM MDT THU JUN 23 2011
WYZ002-003-005>007-015>017-240200-
ABSAROKA MOUNTAINS WY-CODY FOOTHILLS WY-OWL CREEK AND BRIDGER
MOUNTAINS WY-SOUTHEAST BIG HORN BASIN WY-SOUTHWEST BIG HORN BASIN
WY-UPPER WIND RIVER BASIN WY-WIND RIVER BASIN WY-WIND RIVER MOUNTAINS
EAST WY-
721 PM MDT THU JUN 23 2011
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN WASHAKIE...HOT SPRINGS...
EXTREME SOUTHERN PARK AND NORTHERN FREMONT COUNTIES UNTIL 800 PM
MDT...
AT 713 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM DOUBLE CABIN
CAMPGROUND TO 6 MILES NORTHEAST OF U.S. HWY 287/26 MILE MARKER 80 TO
U.S. HWY 287/26 MILE MARKER 90 TO 12 MILES SOUTHWEST OF BULL LAKE...
AND MOVING EAST AT 50 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 55 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.
THESE STORMS WILL BE NEAR...
U.S. HWY 26 MILE MARKER 100 AND WASHAKIE NEEDLES AROUND 725 PM MDT.
PILOT BUTTE RESERVOIR...PAVILLION AND MORTON AROUND 730 PM MDT.
GRASS CREEK RD...STATE HWY 134 MILE MARKER 20...STATE HWY 132...OCEAN
LAKE...ANCHOR DAM AND KINNEAR AROUND 735 PM MDT.
OWL CREEK RD AROUND 740 PM MDT.
GRASS CREEK AND MISSOURI FLAT RD AROUND 745 PM MDT.
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
IN ADDITION...THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...
FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.
BRIEF HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES
AND UNDERPASSES...IS ALSO LIKELY. A FLOOD WARNING IS IN EFFECT FOR
PORTIONS OF THE ADVISED AREA AROUND DUBOIS...A FLOOD WATCH IS IN
EFFECT FOR THE REST OF THE AREA...FLOODING MAY BEGIN OR WORSEN
SUDDENLY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. DO NOT
ENTER FLOOD WATERS UNDER ANY CIRCUMSTANCE.
REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4404 10814 4358 10772 4344 10768 4318 10779
4302 10927 4322 10929 4336 10963 4384 10973
TIME...MOT...LOC 0117Z 261DEG 70KT 4382 10945 4344 10909
4330 10904 4312 10913
ALLENSpecial weather statement, Jun 23, 7:23 PM MDT, 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
723 PM MDT THU JUN 23 2011
WYZ024-027-240200-
SALT RIVER AND WYOMING RANGES WY-SOUTH LINCOLN COUNTY WY-
723 PM MDT THU JUN 23 2011
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LINCOLN COUNTY UNTIL 800
PM MDT...
AT 721 PM MDT...THE PUBLIC REPORTED A SEVERE THUNDERSTORM ABOUT 7
MILES EAST OF MONTPELIER IDAHO MOVING EAST AT 30 MPH. THIS STORM HAS
PRODUCED A FUNNEL CLOUD AND LARGE HAIL. A WARNING MAY BE ISSUED VERY
SOON FOR THIS STORM AS IT APPROACHES THE LINCOLN COUNTY LINE.
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4224 11105 4242 11106 4247 11061 4218 11060
4219 11106 4224 11106
TIME...MOT...LOC 0121Z 267DEG 27KT 4232 11115
JONESSpecial weather statement, Jun 23, 7:44 PM MDT, 29 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
744 PM MDT THU JUN 23 2011
WYZ015-017-018-240230-
LANDER FOOTHILLS WY-WIND RIVER BASIN WY-WIND RIVER MOUNTAINS EAST WY-
744 PM MDT THU JUN 23 2011
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FREMONT COUNTY UNTIL 830
PM MDT...
AT 742 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORM OUTFLOW ALONG A LINE EXTENDING FROM 11 MILES
NORTH OF STATE HWY 134 MILE MARKER 10 TO OCEAN LAKE TO 10 MILES WEST
OF FORT WASHAKIE...AND MOVING SOUTHEAST AT 40 MPH.
WIND GUSTS UP TO 50 MPH ARE EXPECTED.
THESE STRONG WINDS WILL BE NEAR...
STATE HWY 134 MILE MARKER 10 AND FORT WASHAKIE AROUND 755 PM MDT.
HWY JCT 287 AND 132 AND ETHETE AROUND 810 PM MDT.
U.S. HWY 26 MILE MARKER 120 AROUND 815 PM MDT.
U.S. HWY 20/26 MILE MARKER 100 AND SHOSHONI AROUND 820 PM MDT.
HIDDEN VALLEY AROUND 825 PM MDT.
U.S. HWY 26 MILE MARKER 110...U.S. HWY 26 MILE MARKER 130...
RIVERTON...FREMONT COUNTY FAIRGROUNDS...U.S. HWY 20/26 MILE MARKER 90
AND ARAPAHOE AROUND 830 PM MDT.
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4319 10777 4300 10784 4283 10853 4297 10922
4318 10866 4344 10854
TIME...MOT...LOC 0144Z 264DEG 29KT 4336 10845 4319 10853
4298 10910
ALLENSpecial weather statement, Jun 23, 7:59 PM MDT, 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
759 PM MDT THU JUN 23 2011
WYZ005>007-017-240245-
OWL CREEK AND BRIDGER MOUNTAINS WY-SOUTHEAST BIG HORN BASIN
WY-SOUTHWEST BIG HORN BASIN WY-WIND RIVER BASIN WY-
759 PM MDT THU JUN 23 2011
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WASHAKIE...EASTERN HOT
SPRINGS AND NORTHERN FREMONT COUNTIES UNTIL 845 PM MDT...
AT 755 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTH OF HWY
JCT 170 AND 120 TO 7 MILES SOUTH OF HWY JCT 170 AND 120 TO 16 MILES
NORTH OF STATE HWY 134 MILE MARKER 20...AND MOVING EAST AT 35 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 55 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.
THESE STORMS WILL BE NEAR...
KIRBY...WINCHESTER...HOT SPRINGS COUNTY FAIRGROUNDS...THERMOPOLIS
AND LUCERNE AROUND 810 PM MDT.
U.S. HWY 20/789 MILE MARKER 120 AROUND 825 PM MDT.
STATE HWY 172 MILE MARKER 10 AROUND 830 PM MDT.
BLACK MOUNTAIN RD AND BUFFALO CREEK RD AROUND 845 PM MDT.
REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4387 10762 4360 10765 4343 10787 4346 10867
4360 10846 4387 10844
TIME...MOT...LOC 0158Z 270DEG 30KT 4378 10832 4360 10834
4345 10851Special weather statement, Jun 23, 8:03 PM MDT, 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 803 PM MDT THU JUN 23 2011 WYZ007-009-017-020-240245- BIGHORN MOUNTAINS SOUTHEAST WY-NATRONA COUNTY LOWER ELEVATIONS WY-OWL CREEK AND BRIDGER MOUNTAINS WY-WIND RIVER BASIN WY- 803 PM MDT THU JUN 23 2011 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN NATRONA AND EASTERN FREMONT COUNTIES UNTIL 845 PM MDT... AT 759 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR MONETA MOVING EAST AT 35 MPH. WIND GUSTS UP TO 40 MPH...PEA SIZED HAIL...BRIEF HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING ARE ALL EXPECTED WITH THIS STORM THIS STORM WILL BE NEAR... U.S. HWY 20/26 MILE MARKER 70 AROUND 815 PM MDT. HILAND AND U.S. HWY 20/26 MILE MARKER 60 AROUND 830 PM MDT. ARMINTO AROUND 840 PM MDT. MOTORISTS ON U.S. HIGHWAY 20/26 BETWEEN MONETA AND WALTMAN SHOULD PREPARE FOR REDUCED VISIBILITIES AND PONDING OF WATER ON THE ROAD. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4340 10714 4297 10707 4298 10788 4327 10789 TIME...MOT...LOC 0201Z 255DEG 32KT 4312 10770 JONES
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 6:22 PM MDT | Special Weather Statement | RIW | Fremont | 38 min |
| Jun 23, 6:46 PM MDT | Special Weather Statement | RIW | 44 min | |
| Jun 23, 7:21 PM MDT | Special Weather Statement | RIW | Hot Springs | 39 min |
| Jun 23, 7:23 PM MDT | Special Weather Statement | RIW | Lincoln | 37 min |
| Jun 23, 7:26 PM MDT | Severe Thunderstorm Warning | RIW | Lincoln | 32 min |
| Jun 23, 7:44 PM MDT | Special Weather Statement | RIW | Fremont | 46 min |
| Jun 23, 7:59 PM MDT | Special Weather Statement | RIW | Hot Springs | 46 min |
| Jun 23, 8:03 PM MDT | Special Weather Statement | RIW | 42 min | |
| Jun 23, 8:21 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Natrona | 54 min |
| Jun 23, 8:24 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 33 min |
| Jun 23, 8:37 PM MDT | Special Weather Statement | RIW | Natrona | 38 min |
| Jun 23, 8:53 PM MDT | Special Weather Statement | RIW | 37 min | |
| Jun 23, 9:19 PM MDT | Special Weather Statement | RIW | Natrona | 41 min |
| Jun 24, 10:09 AM MDT | Special Weather Statement | RIW | 51 min | |
| Jun 24, 10:58 AM MDT | Special Weather Statement | RIW | 47 min | |
| Jun 24, 10:59 AM MDT | Flood Watch | RIW | Big Horn, Fremont, Hot Springs, Johnson, Lincoln, Natrona and 4 more | 9 hr |
| Jun 24, 11:02 AM MDT | Special Weather Statement | RIW | Park | 43 min |
| Jun 24, 11:49 AM MDT | Special Weather Statement | RIW | 41 min | |
| Jun 24, 12:06 PM MDT | Special Weather Statement | RIW | Park | 39 min |
| Jun 24, 12:31 PM MDT | Special Weather Statement | RIW | Natrona | 44 min |
| Jun 24, 12:33 PM MDT | Special Weather Statement | RIW | 42 min | |
| Jun 24, 12:45 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Park | 30 min |
| Jun 24, 1:12 PM MDT | Special Weather Statement | RIW | Natrona | 48 min |
| Jun 24, 1:16 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn | 44 min |
| Jun 24, 1:25 PM MDT | River Flood Warning | RIW | Fremont | 35 hr |
| Jun 24, 1:25 PM MDT | River Flood Warning | RIW | Fremont | 17 days |
| Jun 24, 1:45 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 17 min |
| Jun 24, 2:01 PM MDT | Special Weather Statement | RIW | Big Horn | 29 min |
| Jun 24, 2:19 PM MDT | Flash Flood Warning | RIW | Big Horn | 3 hr |
| Jun 24, 2:24 PM MDT | Special Weather Statement | RIW | Fremont | 51 min |
| Jun 24, 2:46 PM MDT | Special Weather Statement | RIW | Fremont | 44 min |
| Jun 24, 3:12 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 48 min |
| Jun 24, 3:14 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 61 min |
| Jun 24, 3:42 PM MDT | Special Weather Statement | RIW | Fremont | 63 min |
| Jun 24, 3:52 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Natrona | 38 min |
| Jun 24, 4:13 PM MDT | Special Weather Statement | RIW | Natrona | 32 min |
| Jun 24, 4:31 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 44 min |
| Jun 24, 4:38 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 37 min |
| Jun 24, 5:02 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 43 min |
| Jun 24, 5:12 PM MDT | Special Weather Statement | RIW | Sweetwater | 48 min |
| Jun 24, 5:17 PM MDT | Areal Flood Advisory | RIW | Natrona | 63 min |
| Jun 24, 5:38 PM MDT | Areal Flood Warning | RIW | Big Horn | 8 days |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2011Every severe thunderstorm warning in 2011
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.