Seattle-Tacoma International to Dubois Municipal SEA → DUB
580 nautical miles (667 statute miles) east on a straight line, true course 109°, about 093° magnetic at the departure end (variation 16E). At 120 knots that is 4 h 22 min at the quickest height in today's winds (39,000 ft, a 13-knot tailwind), arriving about 4:57 am MDT (10:57 UTC), after sunset at the destination. Right now SEA is VFR, wind from the east-southeast (110°) at 6 knots; DUB is VFR, wind from the northwest (310°) at 5 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: 507 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 180 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 120 to 340 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 380 nm of the route.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 270 to 450 nm out.
- 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 300 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the last 230 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Near the route, at the destination end.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 0 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 SEA.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- E75L at 1,500 ft, 22 nm south, 9:49 pm PDT (04:49 UTC): remarks: low-level wind shear loss of 8 knots on final. 150 nm along the route, 22 nm south of the line.
as filed, and in English
PSC UA /OV PSC120003/TM 0449/FL015/TP E75L/RM LLWS LOSS OF 8 KTS ON FINAL
- Report
- a routine report filed through PSC
- Where
- 3 nm southeast (120°) of PSC
- Time
- 04:49 UTC
- Height
- at 1,500 ft
- Aircraft
- E75L
- Remarks
- low-level wind shear loss of 8 knots on final
- E75L descending, 50 nm southwest, 9:35 pm PDT (04:35 UTC): light turbulence from 11,000 ft to 14,000 ft, light rime icing from 8,000 ft to 12,000 ft, -10 °C. 170 nm along the route, 50 nm southwest of the line.
as filed, and in English
GEG UA /OV PDT/TM 0435/FLDURD/TP E75L/TA M10/TB LT TURB 140-110/IC LT RIME 120-080
- Report
- a routine report filed through GEG
- Where
- over PDT
- Time
- 04:35 UTC
- Height
- during the descent
- Aircraft
- E75L
- Temperature
- −10 °C
- Turbulence
- lt turbulence from 14,000 ft to 11,000 ft
- Icing
- lt rime from 12,000 ft to 8,000 ft
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 6 forecast points nearest it (SEA, YKM, LWS, DLN, PIH, 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 |
|---|---|---|---|---|---|---|
| 3,500 ft | 070° at 10 kt | +7 kt | 113 kt | 5 h 08 min | 5:43 am MDT (11:43 UTC) | |
| 5,500 ft | 060° at 10 kt | +7 kt | 113 kt | 5 h 08 min | 5:43 am MDT (11:43 UTC) | |
| 7,500 ft | 050° at 8 kt | +4 kt | -4 °C | 116 kt | 5 h | 5:35 am MDT (11:35 UTC) |
| 9,500 ft | 030° at 7 kt | +1 kt | -6 °C | 119 kt | 4 h 52 min | 5:27 am MDT (11:27 UTC) |
| 11,500 ft | 350° at 3 kt | −1 kt | -7 °C | 121 kt | 4 h 48 min | 5:23 am MDT (11:23 UTC) |
| 13,500 ft | 220° at 2 kt | 0 | -10 °C | 120 kt | 4 h 50 min | 5:25 am MDT (11:25 UTC) |
| 15,500 ft | 200° at 6 kt | +2 kt | -14 °C | 118 kt | 4 h 55 min | 5:30 am MDT (11:30 UTC) |
| 17,500 ft | 190° at 10 kt | +4 kt | -17 °C | 116 kt | 5 h | 5:35 am MDT (11:35 UTC) |
| 18,000 ft FL180 | 190° at 11 kt | +4 kt | -18 °C | 116 kt | 5 h | 5:35 am MDT (11:35 UTC) |
| 24,000 ft FL240 | 190° at 16 kt | +6 kt | -28 °C | 114 kt | 5 h 05 min | 5:40 am MDT (11:40 UTC) |
| 30,000 ft FL300 | 230° at 21 kt | −7 kt | -35 °C | 127 kt | 4 h 34 min | 5:09 am MDT (11:09 UTC) |
| 34,000 ft FL340 | 230° at 27 kt | −9 kt | -37 °C | 129 kt | 4 h 30 min | 5:05 am MDT (11:05 UTC) |
| 39,000 ft FL390 | 230° at 33 kt | −13 kt | -41 °C | 133 kt | 4 h 22 min | 4:57 am MDT (10:57 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SEA | used from 0 nm out; 25 nm from the line | 050/7 | 050/11 1° | 050/12 -5° | 030/31 -7° | 010/61 -15° | 010/69 -26° | 360/73 -40° | 360/62 -47° | 330/21 -43° |
| YKM | used from 50 nm out; 27 nm from the line | 070/10 | 040/15 -1° | 020/27 -8° | 030/25 -13° | 020/48 -20° | 010/83 -27° | 010/77 -37° | 010/49 -40° | 350/14 -41° |
| LWS | used from 150 nm out; 54 nm from the line | 070/10 | 080/12 -2° | 030/12 -6° | 080/7 -10° | 170/34 -21° | 160/46 -32° | 200/33 -35° | 220/22 -35° | 230/18 -38° |
| DLN | used from 350 nm out; 60 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° | ||
| PIH | used from 500 nm out; 101 nm from the line | L/V | 240/13 1° | 240/15 -3° | 210/42 -15° | 200/70 -25° | 220/74 -29° | 220/71 -36° | 220/62 -43° | |
| LND | used from 550 nm out; 75 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 |
|---|---|---|---|---|---|---|---|
| SEA Seattle, WA | departure | VFR | from the east-southeast (110°) at 6 knots | 10+ mi | none | 432 ft | 10:53 pm PDT (05:53 UTC) |
| ESW Easton, WA | 50 nm out, 5 nm north of the line | no report just now | 2,226 ft | ||||
| ELN Ellensburg, WA | 80 nm out, 3 nm northwest of the line | VFR Sky: overcast at 9,500 feet | from the northwest (310°) at 3 knots | 10+ mi | 9,500 ft | 1,763 ft | 05:53 UTC |
| PSC Pasco, WA | 150 nm out, 21 nm southwest of the line, tower | VFR Sky: overcast at 9,000 feet | from the north-northwest (340°) at 6 knots | 10+ mi | 9,000 ft | 410 ft | 05:53 UTC |
| ALW Walla Walla, WA | 180 nm out, 18 nm south of the line, tower | VFR Sky: scattered clouds at 6,500 feet, a broken layer at 9,000 feet, overcast at 12,000 feet | from the south-southeast (150°) at 5 knots | 10+ mi | 9,000 ft | 1,194 ft | 05:53 UTC |
| GIC Grangeville, ID | 270 nm out, 9 nm northeast of the line | marginal VFR Sky: overcast at 2,900 feet | calm | 10+ mi | 2,900 ft | 3,313 ft | 06:15 UTC |
| SMN Salmon, ID | 380 nm out, 5 nm north of the line | VFR Sky: a few clouds at 900 feet, scattered clouds at 1,400 feet, overcast at 6,000 feet Weather: light rain | from the north (360°) at 7 knots | 10+ mi | 6,000 ft | 4,044 ft | 06:01 UTC |
| DIJ Driggs, ID | 520 nm out, 18 nm southwest of the line | IFR Sky: overcast at 500 feet Weather: light rain | from the north (010°) at 6 knots | 10+ mi | 500 ft | 6,257 ft | 05:56 UTC |
| JAC Jackson, WY | 540 nm out, 18 nm southwest of the line, tower | VFR Sky: overcast at 5,500 feet | from the southwest (230°) at 5 knots | 10+ mi | 5,500 ft | 6,451 ft | 05:56 UTC |
| DUB Dubois, WY | destination | VFR Sky: scattered clouds at 700 feet, a broken layer at 3,800 feet, overcast at 6,000 feet Weather: drizzle | from the northwest (310°) at 5 knots | 10+ mi | 3,800 ft | 7,298 ft | 12:15 am MDT (06:15 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, 4:57 am MDT (10:57 UTC)
DUB has no terminal forecast; use the nearest airport that does.
The forecast for SEA, the departure
- From Sun 11:00 pm PDT (06:00 UTC): wind from the east-northeast at 6 knots, visibility more than 6 miles, clear skies
- From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, visibility more than 6 miles, patches of fog, clear skies
- From Mon 9:00 am PDT (16:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, clear skies
- From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
- From Mon 8:00 pm PDT (03:00 UTC): wind from the south at 4 knots, visibility more than 6 miles, scattered clouds at 25,000 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 SEA 6:27 pm PDT (01:27 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: Seattle-Tacoma International, Dubois Municipal.