Alert archive / Wyoming / Tornado Watches in 2001

Tornado Watch 472

June 26, 2001Big Horn County, Yellowstone County, Montana; 12 counties in Wyoming

The Storm Prediction Center issued this tornado watch at Jun 26, 2001, 5:00 PM MDT for Big Horn County, Yellowstone County, Montana; 12 counties in Wyoming. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 26, 2001, 5:00 PM MDT (23:00 UTC)
Expired: Jun 26, 2001, 11:00 PM MDT
In force: 6 hr
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Yellowstone County, MT, Big Horn County, WY, Campbell County, WY, Converse County, WY, Goshen County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Niobrara County, WY, Platte County, WY, Sheridan County, WY, Washakie County, WY, Weston County, WY

The radar

The Riverton/Lander radar (KRIW), 190 km from the middle of the area, began a volume at 22:59 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.

Warnings issued inside it

13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 26, 5:03 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	27 min
Jun 26, 5:11 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Hot Springs	49 min
Jun 26, 6:50 PM MDT	Tornado Warning	RIW	Big Horn	25 min
Jun 26, 7:13 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	47 min
Jun 26, 7:15 PM MDT	Tornado Warning	RIW	Big Horn	45 min
Jun 26, 7:28 PM MDT	Severe Thunderstorm Warning	BYZ	Yellowstone	62 min
Jun 26, 7:53 PM MDT	Tornado Warning	BYZ	Yellowstone	37 min
Jun 26, 8:25 PM MDT	Tornado Warning	BYZ	Musselshell, Yellowstone	35 min
Jun 26, 9:00 PM MDT	Tornado Warning	BYZ	Yellowstone	45 min
Jun 26, 9:10 PM MDT	Flash Flood Warning	BYZ	Yellowstone	2 hr
Jun 26, 9:25 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	65 min
Jun 26, 9:45 PM MDT	Tornado Warning	BYZ	Yellowstone	45 min
Jun 26, 9:58 PM MDT	Severe Thunderstorm Warning	BYZ	Yellowstone	62 min

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 11.0 hours before the alert went out and 186 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1851 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS9 KMKC 262251
SEL2  

SEL2  
MKC WW 262244
MTZ000-WYZ000-270500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 472
STORM PREDICTION CENTER NORMAN OK
444 PM MDT TUE JUN 26 2001

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   SOUTHERN MONTANA                            
   NORTHERN AND EASTERN WYOMING                            

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 500 PM UNTIL 1100
PM MDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO
60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 105 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 60 MILES SOUTH SOUTHWEST OF BILLINGS MONTANA
TO 70 MILES EAST OF DOUGLAS WYOMING.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

DISCUSSION...AREA PROFILER AND VWP DATA SHOW 2-3 KM DEEP LAYER OF
MOIST SSELY LOW LEVEL FLOW CONTINUING FROM SE WY NWWD INTO SRN MT. 
THIS JET APPEARS TO BE INDUCED BY UPPER LEVEL IMPULSE ATTM LIFTING
NNEWD OVER SRN UT.  LARGE SCALE ASCENT DOWNSTREAM FROM THIS FEATURE
...COUPLED WITH SUSTAINED MOIST UPSLOPE FLOW AND LOW LEVEL VEERING
...SUGGEST POTENTIAL FOR A FEW STRONG STORMS/POSSIBLE SUPERCELLS
WITH ISOLATED TORNADOES AND SOME HAIL.  

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH...EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. 
MEAN STORM MOTI}ON VECTOR 21025.

...CORFIDI

;463,1090 441,1035 411,1035 432,1090;

Nearby

Tornado Watches in Wyoming, 2001 Tornado Watches in Montana, 2001 Every tornado watch 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; radar from the NEXRAD Level II archive.