Alert archive / Montana / Tornado Watches in 2005
Tornado Watch 417
The Storm Prediction Center issued this tornado watch at Jun 6, 2005, 12:20 PM MDT for 8 counties in Montana; 7 counties in Wyoming. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 6, 2005, 12:20 PM MDT (18:20 UTC)
- Expired
- Jun 6, 2005, 6:00 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT, Yellowstone County, MT, Big Horn County, WY, Campbell County, WY, Crook County, WY, Johnson County, WY, Sheridan County, WY, Washakie County, WY, Weston County, WY
The radar
The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 18:23 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
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 1:34 PM MDT | Tornado Warning | RIW | Hot Springs, Natrona, Washakie | 49 days |
| Jun 6, 3:17 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn | 27 min |
| Jun 6, 3:19 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 57 min |
| Jun 6, 3:54 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 36 min |
| Jun 6, 4:08 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 32 min |
| Jun 6, 4:13 PM MDT | Severe Thunderstorm Warning | UNR | Weston | 35 min |
| Jun 6, 4:36 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 24 min |
| Jun 6, 4:56 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 64 min |
| Jun 6, 5:29 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 31 min |
| Jun 6, 5:43 PM MDT | Tornado Warning | BYZ | Carter, Fallon | 32 min |
| Jun 6, 5:56 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 25 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 6.3 hours before the alert went out and 299 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2339 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 061816
SEL7
SPC WW 061816
MTZ000-WYZ000-070000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 417
NWS STORM PREDICTION CENTER NORMAN OK
1220 PM MDT MON JUN 6 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST MONTANA
NORTHEAST WYOMING
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1220 PM UNTIL 600
PM MDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST NORTHWEST OF
SHERIDAN WYOMING TO 65 MILES NORTHEAST OF MOORCROFT WYOMING. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).
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.
OTHER WATCH INFORMATION...CONTINUE...WW 413...WW 414...WW 415...WW
416...
DISCUSSION...THUNDERSTORMS WILL INCREASE RAPIDLY ACROSS NRN WY AHEAD
OF DEEPENING SURFACE LOW AND APPROACH OF STRONG UPPER S/WV TROUGH.
WITH MDT INSTABILITY OF 40-50 KT OF DEEP LAYER SHEAR SUPERCELLS ARE
LIKELY. PRIMARY THREAT WILL BE LARGE HAIL AND ISOLATED TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 23030.
...HALES
464,1082 463,1035 432,1035 433,1082SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 11:29 AM MDT | Mesoscale Discussion | SPC | Big Horn, Powder River | 2 hr |
| Jun 6, 2:00 PM MDT | Tornado Watch | SPC | Carter | 8 hr |
| Jun 6, 2:15 PM MDT | Mesoscale Discussion | SPC | Dawson, Garfield, McCone, Prairie, Richland, Roosevelt and 2 more | 2 hr |
| Jun 6, 4:15 PM MDT | Tornado Watch | SPC | Dawson, Garfield, McCone, Phillips, Prairie, Richland and 3 more | 7 hr |
| Jun 6, 5:28 PM MDT | Mesoscale Discussion | SPC | Carter, Custer, Fallon, Powder River, Rosebud | 62 min |
| Jun 6, 1:22 PM MDT | Mesoscale Discussion | SPC | Goshen, Laramie, Niobrara, Platte | 113 min |
Nearby
Tornado Watches in Montana, 2005Tornado Watches in Wyoming, 2005Every tornado watch in 2005
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.