Alert archive / Wyoming / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 16, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 26, 2001, 7:13 PM MDT for Big Horn County, Wyoming. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 26, 2001, 7:13 PM MDT (01:13 UTC)
- Expired
- Jun 26, 2001, 8:00 PM MDT
- In force
- 47 min
- Issued by
- NWS Riverton, WY
- Area
- Whole counties
County Big Horn County, WY
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 26, 5:00 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 1.2 hours before the alert went out and 165 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
- 145 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 3130 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KRIW 270115 SVRRIW WYC003-270200- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE RIVERTON WY 713 PM MDT TUE JUN 26 2001 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN BIG HORN COUNTY IN NORTH CENTRAL WYOMING * UNTIL 800 PM MDT * AT 713 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES SOUTHEAST OF GREYBULL...MOVING NORTH AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE... 6 MILES EAST OF GREYBULL AROUND 720 PM MDT THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING... HAIL UP TO THE SIZE OF NICKELS. DAMAGING WINDS GREATER THAN 60 MILES AN HOUR. FREQUENT CLOUD-TO-GROUND LIGHTNING. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN RIVERTON. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER... SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS. $$ LAT...LON 4432 10845 4432 10783 4496 1x0790 4498 10853 SULLIVAN
What 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 26, 1:00 PM MDT, 6 hours 13 minutes earlier.
Area forecast discussion, Jun 26, 1:00 PM MDT, 6 hours 13 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 1 PM MDT TUE JUN 26 2001 ISOLD CNVCTN FIRING UP AT 1230 PM THIS AFTN WITH AN OTHERWISE FAIR SKY. ETA/AVN MDLS IN AGRMNT WITH MAIN FTRS THIS RUN...BUT THE ETA HNDLG SHORT TERM DETAILS BTR. LOW LVL CNVRGNC ZONE OVR CNTRL FCST AREA THIS AFTN WITH SHT/WVS MOVG UP FM THE SOUTH WILL KICK OFF CNVCTN THIS AFTN. DWPTS ARE RISING WITH LOW LVL MSTR FLUX FM THE SE...SO THESE STRMS SHOULD HAVE SOME HEAVY SHWRS AND HAIL. THETA-E RDG THRU THIS EVG AT H8 RUNS OVR MAINLY THE FAR E AND STRETCHES TO THE NRN AND NE FCST AREAS. WITH THE RMNTS OF THE SRN CA UPR LOW MOVG INTO THE SW LT TNGHT WILL KEEP TSTMS GOING ALL NIGHT. WITH A SFC LOW DVLPG OVR SW WY THIS AFTN THEN INTO CNTRL WY BY THIS EVG XCPT INCRS SW WNDS BHND THE LOW ESPCLY ON WED AS THE LOW REACHS THE XTRM N-NE BY 12Z. MAIN CHG TO FCST WILL BE TO BUMP UP POPS INTO HIGH SCT RNG FOR THIS EVG. FOR WED THE UPR RDG STARTS BLDG FM THE SW AND WILL GO WITH ONLY ISOLD SHWRS OVR THE CNTRL-SW WITH SCT TSTMS OVR THE N-NE-E AND SCT SHWRS NW. FOR THUR THE RDG CONTS TO BLD OVR THE FCST AREA AND WILL GO WITH ONLY ISOLD PM TSTMS HIGHER TRRN. AS FOR TMPS WED WILL UNDERCUT GUICDANCE SM AND CONT TMPS SMLR TO TODAY OR A LTL WARMER...AND THEN FOR THUR A FEW DEGS WARMER. XTNDD FCST ON TRAK WITH HOT AND DRY WITH SLGHT CHC PM TSTMS MAINLY HIGHER TRRN AS RDG CONTS TO BLD OVR THE CNTRL RCKYS. RWM .RIW...NONE.
In the hours before
Special weather statement, Jun 26, 5:00 PM MDT, 2 hours 13 minutes before
WYZ002-004-005-008-009-013-015-026>028-270000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 500 PM MDT TUE JUN 26 2001 ...A TORNADO WATCH HAS BEEN ISSUED FOR PARTS OF CENTRAL AND NORTHERN WYOMING UNTIL 1100 PM MDT... ...STRONG THUNDERSTORMS OVER CENTRAL NATRONA AND NORTHEAST FREMONT COUNTY... AT 455 PM MDT...RIVERTON DOPPLER RADAR SHOWED STRONG THUNDERSTORMS OVER CENTRAL NATRONA COUNTY NEAR THE COMMUNITY OF NATRONA...AND OVER NORTHEAST FREMONT COUNTY NEAR BOYSEN RESERVOIR. THESE STORMS WERE MOVING NORTH AT BETWEEN 15 AND 20 MPH. FREQUENT LIGHTNING... GUSTY WINDS...BRIEF HEAVY RAIN...AND HAIL MAY ACCOMPANY THESE STORMS. THE AIRMASS OVER CENTRAL AND NORTHERN WYOMING IS VERY MOIST AND UNSTABLE THIS EVENING...AND THE STORMS OVER NATRONA AND NORTHEAST FREMONT COUNTY WILL LIKELY INTENSIFY AS THEY MOVE NORTH INTO NORTHERN WYOMING. THE COUNTIES IN THE TORNADO WATCH AREA INCLUDE EASTERN PARK...BIG HORN...HOT SPRINGS...WASHAKIE...JOHNSON AND NATRONA. CONTINUE TO LISTEN TO THIS STATION FOR LATER STATEMENTS AND POSSIBLE WARNINGS. DN WCJIN-WYNW-WYNE
Local storm report, Jun 26, 5:20 PM MDT, 1 hour 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON, WY
520 PM MDT TUE JUN 26 2001
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0316 PM ALCOVA WY FUNNEL CLOUD
06/26/01 NATRONA REPORTED BY PUBLIC
0320 PM 5 N ALCOVA WY FUNNEL CLOUD
06/26/01 NATRONA
0322 PM 3 N ALCOVA WY FUNNEL CLOUD
06/26/01 NATRONA REPORTED BY SPOTTERS
0324 PM 3 NW ALCOVA WY FUNNEL CLOUD
06/26/01 NATRONA
0325 PM 3 N ALCOVA WY FUNNEL CLOUD
06/26/01 NATRONA REPORTED BY SPOTTERS
0343 PM 13-18 WSW CASPER WY FUNNEL CLOUD
06/26/01 NATRONA
0345 PM 40 SW CASPER WY .75 INCH HAIL
06/26/01 NATRONA
MLCLocal storm report, Jun 26, 6:23 PM MDT, 50 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON, WY
623 PM MDT TUE JUN 26 2001
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0545 PM 6 SE THERMOPOLIS WY WIND DAMAGE
06/26/01 HOT SPRINGS 1"-2" TREE BRANCHES
DOWN FROM WIND.
ESTIMATED WIND GUST
| OF 60 MPH.
MLCLocal storm report, Jun 26, 6:57 PM MDT, 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON, WY
657 PM MDT TUE JUN 26 2001
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0655 PM 1 S GREYBULL WY TORNADO
06/26/01 BIG HORN
0656 PM 1 W GREYBULL WY TORNADO
06/26/01 BIG HORN
MLCLocal storm report, Jun 26, 7:05 PM MDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON, WY
705 PM MDT TUE JUN 26 2001
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0702 PM 1/2 S GREYBULL WY .75 INCH HAIL
06/26/01 BIG HORNLocal storm report, Jun 26, 7:13 PM MDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON, WY
713 PM MDT TUE JUN 26 2001
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0653 PM 1 W GREYBULL WY TORNADO
06/26/01 BIG HORN
0707 PM 1 E GREYBULL WY FUNNEL CLOUD
06/26/01 BIG HORN
0642 PM 10 SW BASIN WY FUNNEL CLOUD
06/26/01 BIG HORN
MLCThe office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 6:50 PM MDT | Tornado Warning | RIW | Big Horn | 25 min |
| Jun 26, 7:15 PM MDT | Tornado Warning | RIW | Big Horn | 45 min |
| Jun 27, 2:05 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Washakie | 40 min |
| Jun 27, 2:28 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs, Washakie | 32 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2001Every severe thunderstorm warning in 2001
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.