Tacoma Narrows Airport to Bozeman Yellowstone International TIW → BZN
480 nautical miles (552 statute miles) east on a straight line, true course 097°, about 077° magnetic at the departure end (variation 20E). At 120 knots that is 3 h 38 min at the quickest height in today's winds (39,000 ft, a 12-knot tailwind), arriving about 7:21 am MDT (13:21 UTC), after sunset at the destination. Right now TIW is VFR, wind calm; BZN is low IFR, wind calm. 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 TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 392 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the last 323 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 265 nm of the route.
- 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 last 206 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 TIW.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 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 5 forecast points nearest it (SEA, YKM, GEG, LWS, DLN). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 3,500 ft | 360° at 4 kt | −1 kt | 121 kt | 3 h 58 min | 7:41 am MDT (13:41 UTC) | |
| 5,500 ft | 360° at 6 kt | −1 kt | -2 °C | 121 kt | 3 h 58 min | 7:41 am MDT (13:41 UTC) |
| 7,500 ft | 030° at 2 kt | +1 kt | -4 °C | 119 kt | 4 h 02 min | 7:45 am MDT (13:45 UTC) |
| 9,500 ft | 050° at 3 kt | +3 kt | -6 °C | 117 kt | 4 h 06 min | 7:49 am MDT (13:49 UTC) |
| 11,500 ft | 020° at 3 kt | +1 kt | -7 °C | 119 kt | 4 h 02 min | 7:45 am MDT (13:45 UTC) |
| 13,500 ft | 040° at 6 kt | +3 kt | -11 °C | 117 kt | 4 h 06 min | 7:49 am MDT (13:49 UTC) |
| 15,500 ft | 040° at 9 kt | +6 kt | -14 °C | 114 kt | 4 h 13 min | 7:56 am MDT (13:56 UTC) |
| 17,500 ft | 050° at 12 kt | +8 kt | -18 °C | 112 kt | 4 h 17 min | 8:00 am MDT (14:00 UTC) |
| 18,000 ft FL180 | 050° at 13 kt | +9 kt | -19 °C | 111 kt | 4 h 19 min | 8:02 am MDT (14:02 UTC) |
| 24,000 ft FL240 | 330° at 3 kt | 0 | -29 °C | 120 kt | 4 h | 7:43 am MDT (13:43 UTC) |
| 30,000 ft FL300 | 320° at 8 kt | −4 kt | -36 °C | 124 kt | 3 h 52 min | 7:35 am MDT (13:35 UTC) |
| 34,000 ft FL340 | 240° at 12 kt | −7 kt | -39 °C | 127 kt | 3 h 47 min | 7:30 am MDT (13:30 UTC) |
| 39,000 ft FL390 | 230° at 22 kt | −12 kt | -42 °C | 132 kt | 3 h 38 min | 7:21 am MDT (13:21 UTC) |
Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SEA | used from 0 nm out; 19 nm from the line | 350/5 | 010/6 0° | 010/9 -4° | 010/27 -6° | 010/51 -15° | 360/58 -26° | 360/60 -41° | 350/55 -48° | 340/30 -45° |
| YKM | used from 49 nm out; 34 nm from the line | 360/6 | 360/11 -1° | 030/20 -7° | 040/21 -11° | 020/55 -18° | 010/84 -26° | 010/79 -40° | 010/45 -42° | 350/23 -42° |
| GEG | used from 147 nm out; 58 nm from the line | 060/7 -2° | 070/12 -6° | 050/8 -8° | 120/11 -21° | 110/18 -33° | 030/22 -37° | 040/6 -38° | 240/7 -41° | |
| LWS | used from 196 nm out; 23 nm from the line | L/V | 340/5 -3° | L/V -6° | 040/7 -10° | 100/23 -22° | 180/30 -31° | 190/11 -34° | 200/11 -36° | 220/23 -40° |
| DLN | used from 343 nm out; 78 nm from the line | 190/10 -4° | 220/23 -4° | 210/21 -18° | 210/43 -28° | 210/60 -33° | 210/72 -37° | 210/67 -44° |
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 |
|---|---|---|---|---|---|---|---|
| TIW Tacoma, WA | departure | VFR | calm | 10+ mi | none | 294 ft | 1:53 am PDT (08:53 UTC) |
| ELN Ellensburg, WA | 88 nm out, 5 nm southwest of the line | VFR Sky: overcast at 8,500 feet | from the east-northeast (070°) at 3 knots | 10+ mi | 8,500 ft | 1,763 ft | 08:53 UTC |
| MWH Moses Lake, WA | 127 nm out, 15 nm northeast of the line, tower | VFR | from the north-northwest (340°) at 8 knots | 10+ mi | none | 1,188 ft | 08:52 UTC |
| LWS Lewiston, ID | 235 nm out, 19 nm south of the line, tower | VFR Sky: scattered clouds at 6,000 feet, overcast at 8,000 feet | calm | 10+ mi | 8,000 ft | 1,442 ft | 08:56 UTC |
| HRF Hamilton, MT | 353 nm out, 2 nm south of the line | VFR Sky: a few clouds at 4,300 feet, a few clouds at 4,800 feet, overcast at 7,000 feet | from the southeast (140°) at 5 knots | 10+ mi | 7,000 ft | 3,635 ft | 09:35 UTC |
| BTM Butte, MT | 421 nm out, 4 nm south of the line | marginal VFR Sky: a few clouds at 600 feet, overcast at 1,200 feet Weather: mist | calm | 6 mi | 1,200 ft | 5,550 ft | 09:01 UTC |
| BZN Bozeman, MT | destination | low IFR Sky: overcast at 300 feet | calm | 10+ mi | 300 ft | 4,473 ft | 2:56 am MDT (08:56 UTC) |
The highest airport on this list sits at 5,550 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At BZN when you get there the forecast at the estimated arrival, 7:21 am MDT (13:21 UTC)
Wind light and variable, visibility 6 miles, mist, scattered clouds at 800 feet VFR
The whole forecast for BZN
- From Mon 1:00 am MDT (07:00 UTC): wind light and variable, visibility 6 miles, mist, scattered clouds at 800 feet
- At times between Mon 1:00 am MDT (07:00 UTC) and 5:00 am MDT (11:00 UTC): overcast at 600 feet
- From Mon 10:00 am MDT (16:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 800 feet, overcast at 1,000 feet
- From Mon 2:00 pm MDT (20:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 800 feet, a broken layer at 1,500 feet
- From Mon 6:00 pm MDT (00:00 UTC): wind light and variable, visibility 6 miles, mist, scattered clouds at 800 feet, a broken layer at 2,000 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 TIW 6:26 pm PDT (01:26 UTC), at BZN 6:42 pm MDT (00:42 UTC) (civil twilight ends 7:12 pm MDT (01:12 UTC)). At 120 knots the arrival at BZN is before sunrise there (7:36 am MDT (13:36 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: Tacoma Narrows Airport, Bozeman Yellowstone International.