Missoula Montana Airport to Dubois Municipal MSO → DUB
275 nautical miles (316 statute miles) southeast on a straight line, true course 136°, about 123° magnetic at the departure end (variation 13E). At 120 knots that is 2 h 15 min at the quickest height in today's winds (11,500 ft, a 2-knot tailwind), arriving about 4:35 am MDT (10:35 UTC), after sunset at the destination. Right now MSO is VFR, wind from the west-southwest (250°) at 5 knots; DUB is VFR, wind from the west-northwest (300°) at 8 knots. For planning, not a briefing: the legal preflight briefing comes from Flight Service (1-800-WX-BRIEF) or the FAA's own tools. Airlines fly this pair: 1 flights in the DOT's last twelve reported months, the route's page.
The route the straight line, the warnings crossed, restrictions, pilot reports and the airports along the way · click a mark for its words
Green, blue, red and purple airport dots are the flying conditions reported there now (VFR, marginal VFR, IFR, low IFR); grey means no report. Red areas are SIGMETs, orange areas AIRMETs, hatched red areas temporary flight restrictions. Map tiles: OpenFreeMap, data © OpenStreetMap contributors.
Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of
- AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the first 255 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the first 78 nm of the route.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 98 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the first 186 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the last 39 nm of the route.
A SIGMET warns of weather hazardous to all aircraft; an AIRMET of weather that matters to small aircraft and to flying without instruments. "From 60 to 180 nm out" is measured along the route from MSO.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- E73L descending, 43 nm northeast, 12:20 am MDT (06:20 UTC): remarks: breaking action good broke out about 600FT above ground. 137 nm along the route, 43 nm northeast of the line.
as filed, and in English
BZN UA /OV BZN/TM 0620/FLDURD/TP E73L/RM BREAKING ACTION GOOD. BROKE OUT ABOUT 600FT AGL
- Report
- a routine report filed through BZN
- Where
- over BZN
- Time
- 06:20 UTC
- Height
- during the descent
- Aircraft
- E73L
- Remarks
- breaking action good broke out about 600FT above ground
- B737 , 43 nm northeast, 11:31 pm MDT (05:31 UTC): remarks: saw the light at 500FT braking good no icing. 137 nm along the route, 43 nm northeast of the line.
as filed, and in English
BZN UA /OV BZN/TM 0531/FLBURD/TP B737/RM SAW THE LIGHT AT 500FT. BRAKING GOOD. NEG ICING
- Report
- a routine report filed through BZN
- Where
- over BZN
- Time
- 05:31 UTC
- Height
- at BURD
- Aircraft
- B737
- Remarks
- saw the light at 500FT braking good no icing
Winds aloft along the route, and the time en route the forecast for use 02:00–09:00 UTC · at 120 knots true airspeed
The eastbound cruising heights for this course (VFR: odd thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 2 forecast points nearest it (DLN, LND). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 7,500 ft | 120° at 5 kt | +5 kt | -5 °C | 115 kt | 2 h 23 min | 4:43 am MDT (10:43 UTC) |
| 9,500 ft | 170° at 4 kt | +3 kt | -5 °C | 117 kt | 2 h 21 min | 4:41 am MDT (10:41 UTC) |
| 11,500 ft | 230° at 19 kt | −2 kt | -3 °C | 122 kt | 2 h 15 min | 4:35 am MDT (10:35 UTC) |
| 13,500 ft | 230° at 25 kt | −1 kt | -6 °C | 121 kt | 2 h 16 min | 4:36 am MDT (10:36 UTC) |
| 15,500 ft | 220° at 29 kt | +4 kt | -10 °C | 116 kt | 2 h 22 min | 4:42 am MDT (10:42 UTC) |
| 17,500 ft | 210° at 33 kt | +8 kt | -14 °C | 112 kt | 2 h 27 min | 4:47 am MDT (10:47 UTC) |
| 18,000 ft FL180 | 210° at 34 kt | +9 kt | -15 °C | 111 kt | 2 h 29 min | 4:49 am MDT (10:49 UTC) |
| 24,000 ft FL240 | 210° at 59 kt | +16 kt | -25 °C | 104 kt | 2 h 39 min | 4:59 am MDT (10:59 UTC) |
| 30,000 ft FL300 | 210° at 64 kt | +18 kt | -33 °C | 102 kt | 2 h 42 min | 5:02 am MDT (11:02 UTC) |
| 34,000 ft FL340 | 210° at 80 kt | +22 kt | -36 °C | 98 kt | 2 h 48 min | 5:08 am MDT (11:08 UTC) |
| 39,000 ft FL390 | 220° at 76 kt | +8 kt | -42 °C | 112 kt | 2 h 27 min | 4:47 am MDT (10:47 UTC) |
Based on data from the 12th at 00:00 UTC; valid on the 12th at 06:00 UTC for use 02:00 to 09:00 UTC; temperatures above 24,000 ft are below zero. Heights are above sea level; a height is left out when the forecast has no wind for it over most of the line (the ground is higher). Ground speed is the airspeed less the headwind; the time en route is for the straight line and ignores climb, descent and routing around weather.
The forecast points as issued
| Point | From | 3,000 | 6,000 | 9,000 | 12,000 | 18,000 | 24,000 | 30,000 | 34,000 | 39,000 |
|---|---|---|---|---|---|---|---|---|---|---|
| DLN | used from 0 nm out; 95 nm from the line | 090/6 -6° | 240/22 -4° | 210/34 -16° | 210/62 -25° | 210/66 -34° | 210/82 -36° | 220/77 -42° | ||
| LND | used from 245 nm out; 76 nm from the line | 200/23 6° | 220/31 1° | 220/39 -11° | 230/39 -23° | 220/51 -28° | 220/66 -37° | 230/68 -45° |
The weather now: both ends and the airports along the way public airports with a weather report within 25 nm of the line, one for each stretch
| Airport | Where | Conditions | Wind | Visibility | Ceiling | Elevation | Reported |
|---|---|---|---|---|---|---|---|
| MSO Missoula, MT | departure | VFR Sky: a few clouds at 3,600 feet, overcast at 8,000 feet | from the west-southwest (250°) at 5 knots | 8 mi | 8,000 ft | 3,205 ft | 2:02 am MDT (08:02 UTC) |
| BTM Butte, MT | 88 nm out, 8 nm northeast of the line | marginal VFR Sky: a few clouds at 900 feet, a broken layer at 1,200 feet, overcast at 2,600 feet | variable at 3 knots | 10+ mi | 1,200 ft | 5,550 ft | 08:02 UTC |
| RVF Twin Bridges, MT | 108 nm out, 5 nm south of the line | marginal VFR Sky: overcast at 2,700 feet | from the north-northeast (030°) at 20 knots | 8 mi | 2,700 ft | 4,788 ft | 07:55 UTC |
| WYS West Yellowstone, MT | 186 nm out, 4 nm northwest of the line | marginal VFR Sky: overcast at 2,600 feet | from the northwest (310°) at 3 knots | 10+ mi | 2,600 ft | 6,649 ft | 08:10 UTC |
| DUB Dubois, WY | destination | VFR Sky: overcast at 4,600 feet | from the west-northwest (300°) at 8 knots | 10+ mi | 4,600 ft | 7,298 ft | 2:15 am MDT (08:15 UTC) |
The highest airport on this list sits at 7,298 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At DUB when you get there the forecast at the estimated arrival, 4:35 am MDT (10:35 UTC)
DUB has no terminal forecast; use the nearest airport that does.
The forecast for MSO, the departure
- From Mon 1:00 am MDT (07:00 UTC): wind from the east at 2 knots, visibility more than 6 miles, showers nearby, scattered clouds at 1,500 feet, a broken layer at 4,000 feet
- From Mon 2:00 am MDT (08:00 UTC): wind from the east at 4 knots, visibility 4 miles, light snow, mist, overcast at 1,500 feet
- From Mon 8:00 am MDT (14:00 UTC): wind from the east-southeast at 4 knots, visibility more than 6 miles, overcast at 5,000 feet
- From Mon 2:00 pm MDT (20:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, overcast at 10,000 feet
Temporary flight restrictions on the line or within 25 nm of it
No temporary flight restriction on or near this route right now.
Daylight
Sunset at MSO 6:53 pm MDT (00:53 UTC), at DUB 6:39 pm MDT (00:39 UTC) (civil twilight ends 7:07 pm MDT (01:07 UTC)). At 120 knots the arrival at DUB is before sunrise there (7:29 am MDT (13:29 UTC)).
Each restriction opens the FAA's own page with the exact area, heights and times. Ordinary notices to air missions (closed runways, lights out) are not shown: the FAA's notice search is not open to sites like this one at this time.
Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads
Sources: the Aviation Weather Center's data service (SIGMETs, AIRMETs, graphical AIRMETs, pilot reports, winds and temperatures aloft, observations and terminal forecasts), the National Weather Service radar, the Weather Prediction Center's charts, the FAA's temporary flight restriction list and shapes, and the FAA's airport file for the positions, elevations and magnetic variation. Fetched when the page is viewed and kept a few minutes. Each leg is the straight line between its two airports; airways, terrain and airspace are not considered. The airports in detail: Missoula Montana Airport, Dubois Municipal.