Boeing Fld/King County International to Jackson Hole Airport BFI → JAC
539 nautical miles (621 statute miles) east on a straight line, true course 112°, about 097° magnetic at the departure end (variation 15E). At 120 knots that is 3 h 53 min at the quickest height in today's winds (39,000 ft, a 19-knot tailwind), arriving about 10:03 pm MDT (04:03 UTC), after sunset at the destination. Right now BFI is VFR, wind variable at 6 knots; JAC is VFR, wind from the northeast (040°) at 4 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 TANGO 1W: moderate turbulence above 18,000 ft from 25,000 ft to 39,000 ft. Over the first 0 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 120 to 320 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 360 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 280 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 270 nm of the route.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the last 110 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 40 nm of the route.
- AIRMET TANGO 1W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the last 20 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 BFI.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- B738 at 33,000 ft, 24 nm northeast, 4:57 pm PDT (23:57 UTC): moderate chop turbulence from 31,000 ft to 33,000 ft. 469 nm along the route, 24 nm northeast of the line.
as filed, and in English
IDA UA /OV DBS015030/TM 2357/FL330/TP B738/TB MOD CHOP 310-330 /ZLC
- Report
- a routine report filed through IDA
- Where
- 30 nm north (015°) of DBS
- Time
- 23:57 UTC
- Height
- at 33,000 ft
- Aircraft
- B738
- Turbulence
- moderate chop from 31,000 ft to 33,000 ft zlc
- C172 at 5,500 ft, 23 nm northeast, 3:17 pm PDT (22:17 UTC): a trace of rime icing, 0 °C, remarks: zse. 180 nm along the route, 23 nm northeast of the line.
as filed, and in English
PUW UA /OV PUW250030/TM 2217/FL055/TP C172/TA 00/IC TRACE RIME/RM -ZSE
- Report
- a routine report filed through PUW
- Where
- 30 nm west (250°) of PUW
- Time
- 22:17 UTC
- Height
- at 5,500 ft
- Aircraft
- C172
- Temperature
- 0 °C
- Icing
- trace rime
- Remarks
- zse
- GL7T at 40,000 ft, 47 nm southwest, 2:35 pm PDT (21:35 UTC): light to moderate turbulence from 37,500 ft to 40,000 ft, remarks: durd-zse. 200 nm along the route, 47 nm southwest of the line.
as filed, and in English
PDT UA /OV PDT100030/TM 2135/FL400/TP GL7T/TB OCNL LGT-MOD 400-375/RM DURD-ZSE
- Report
- a routine report filed through PDT
- Where
- 30 nm east (100°) of PDT
- Time
- 21:35 UTC
- Height
- at 40,000 ft
- Aircraft
- GL7T
- Turbulence
- occasional light to moderate from 40,000 ft to 37,500 ft
- Remarks
- durd-zse
- PC12 at 15,000 ft, 24 nm southwest, 4:47 pm PDT (23:47 UTC): light rime icing above 15,000 ft. At the destination end, 24 nm southwest of the line.
as filed, and in English
JAC UA /OV JAC200025/TM 2347/FL150/TP PC12/IC LGT RIME 150 /ZLC
- Report
- a routine report filed through JAC
- Where
- 25 nm south (200°) of JAC
- Time
- 23:47 UTC
- Height
- at 15,000 ft
- Aircraft
- PC12
- Icing
- light rime at 15,000 ft zlc
- CRJ7 at 17,000 ft, 29 nm south, 4:03 pm PDT (23:03 UTC): light rime icing, -6 °C. At the destination end, 29 nm south of the line.
as filed, and in English
JAC UA /OV JAC160030/TM 2303/FL170/TP CRJ7/TA M6/IC LGT RIME /ZLC
- Report
- a routine report filed through JAC
- Where
- 30 nm south (160°) of JAC
- Time
- 23:03 UTC
- Height
- at 17,000 ft
- Aircraft
- CRJ7
- Temperature
- −6 °C
- Icing
- light rime zlc
- A320 at 6,800 ft, 1 nm north, 3:08 pm PDT (22:08 UTC): scattered clouds above 6,800 ft; overcast above 8,000 ft. At the destination end, 1 nm north of the line.
as filed, and in English
JAC UA /OV JAC/TM 2208/FL068/TP A320/SK SCT068 OVC080
- Report
- a routine report filed through JAC
- Where
- over JAC
- Time
- 22:08 UTC
- Height
- at 6,800 ft
- Aircraft
- A320
- Sky
- SCT068 OVC080
Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 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, LWS, DLN, PIH). 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 | 020° at 9 kt | 0 | 120 kt | 4 h 30 min | 10:40 pm MDT (04:40 UTC) | |
| 5,500 ft | 030° at 11 kt | +1 kt | 119 kt | 4 h 32 min | 10:42 pm MDT (04:42 UTC) | |
| 7,500 ft | 040° at 11 kt | +3 kt | -4 °C | 117 kt | 4 h 36 min | 10:46 pm MDT (04:46 UTC) |
| 9,500 ft | 040° at 10 kt | +3 kt | -6 °C | 117 kt | 4 h 36 min | 10:46 pm MDT (04:46 UTC) |
| 11,500 ft | 070° at 4 kt | +4 kt | -7 °C | 116 kt | 4 h 39 min | 10:49 pm MDT (04:49 UTC) |
| 13,500 ft | 130° at 4 kt | +4 kt | -11 °C | 116 kt | 4 h 39 min | 10:49 pm MDT (04:49 UTC) |
| 15,500 ft | 160° at 6 kt | +5 kt | -14 °C | 115 kt | 4 h 41 min | 10:51 pm MDT (04:51 UTC) |
| 17,500 ft | 170° at 8 kt | +6 kt | -18 °C | 114 kt | 4 h 44 min | 10:54 pm MDT (04:54 UTC) |
| 18,000 ft FL180 | 170° at 9 kt | +6 kt | -19 °C | 114 kt | 4 h 44 min | 10:54 pm MDT (04:54 UTC) |
| 24,000 ft FL240 | 210° at 19 kt | 0 | -26 °C | 120 kt | 4 h 30 min | 10:40 pm MDT (04:40 UTC) |
| 30,000 ft FL300 | 210° at 28 kt | 0 | -36 °C | 120 kt | 4 h 30 min | 10:40 pm MDT (04:40 UTC) |
| 34,000 ft FL340 | 230° at 35 kt | −11 kt | -39 °C | 131 kt | 4 h 07 min | 10:17 pm MDT (04:17 UTC) |
| 39,000 ft FL390 | 240° at 38 kt | −19 kt | -42 °C | 139 kt | 3 h 53 min | 10:03 pm MDT (04:03 UTC) |
Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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; 24 nm from the line | 360/9 | 350/10 1° | 010/10 -5° | 030/20 -11° | 020/60 -17° | 010/86 -26° | 360/90 -40° | 010/68 -42° | 360/31 -43° |
| YKM | used from 50 nm out; 29 nm from the line | 030/16 | 020/18 0° | 030/30 -8° | 030/23 -13° | 020/40 -23° | 010/73 -29° | 010/54 -36° | 360/29 -37° | 330/16 -40° |
| LWS | used from 150 nm out; 56 nm from the line | 010/5 | 050/14 -2° | 040/12 -6° | 160/7 -10° | 190/30 -22° | 200/54 -27° | 200/48 -35° | 210/40 -37° | 230/32 -41° |
| DLN | used from 350 nm out; 69 nm from the line | 080/10 -3° | 180/8 -3° | 180/23 -14° | 200/58 -22° | 200/80 -36° | 220/85 -41° | 230/81 -45° | ||
| PIH | used from 499 nm out; 82 nm from the line | 270/10 | 270/13 1° | 210/16 -2° | 200/56 -11° | 200/51 -23° | 200/68 -33° | 220/77 -37° | 230/73 -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 |
|---|---|---|---|---|---|---|---|
| BFI Seattle, WA | departure | VFR | variable at 6 knots | 10+ mi | none | 21 ft | 4:53 pm PDT (23:53 UTC) |
| ESW Easton, WA | 50 nm out, 2 nm north of the line | no report just now | 2,226 ft | ||||
| ELN Ellensburg, WA | 80 nm out, 2 nm west of the line | VFR Sky: overcast at 8,500 feet | from the northeast (050°) at 5 knots | 10+ mi | 8,500 ft | 1,763 ft | 23:53 UTC |
| PSC Pasco, WA | 150 nm out, 19 nm southwest of the line, tower | VFR Sky: a few clouds at 7,000 feet | from the northeast (040°) at 11 knots | 10+ mi | none | 410 ft | 23:53 UTC |
| ALW Walla Walla, WA | 190 nm out, 15 nm southwest of the line, tower | VFR Sky: overcast at 4,900 feet | calm | 10+ mi | 4,900 ft | 1,194 ft | 23:53 UTC |
| LWS Lewiston, ID | 230 nm out, 23 nm north of the line, tower | VFR Sky: overcast at 6,000 feet | from the west (270°) at 7 knots | 10+ mi | 6,000 ft | 1,442 ft | 23:56 UTC |
| GIC Grangeville, ID | 270 nm out, 16 nm northeast of the line | marginal VFR Sky: overcast at 2,900 feet | from the north (360°) at 7 knots | 10+ mi | 2,900 ft | 3,313 ft | 23:55 UTC |
| SMN Salmon, ID | 380 nm out, 15 nm north of the line | marginal VFR Sky: a few clouds at 400 feet, a broken layer at 1,200 feet, overcast at 3,000 feet Weather: light rain | from the north-northwest (340°) at 9 knots | 10+ mi | 1,200 ft | 4,044 ft | 23:56 UTC |
| DIJ Driggs, ID | 519 nm out, 3 nm southeast of the line | low IFR Sky: a broken layer at 300 feet, overcast at 4,600 feet Weather: light rain | from the west-northwest (290°) at 5 knots | 10+ mi | 300 ft | 6,257 ft | 23:56 UTC |
| JAC Jackson, WY | destination | VFR Sky: a few clouds at 900 feet, a broken layer at 4,800 feet, overcast at 5,500 feet Weather: light rain | from the northeast (040°) at 4 knots | 7 mi | 4,800 ft | 6,451 ft | 5:56 pm MDT (23:56 UTC) |
The highest airport on this list sits at 6,451 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At JAC when you get there the forecast at the estimated arrival, 10:03 pm MDT (04:03 UTC)
Wind from the north-northeast at 5 knots, visibility more than 6 miles, showers nearby, scattered clouds at 1,500 feet, overcast at 2,500 feet marginal VFR
The whole forecast for JAC
- From Sun 6:00 pm MDT (00:00 UTC): wind from the west at 7 knots, visibility 6 miles, light rain showers, scattered clouds at 700 feet, a broken layer at 1,200 feet and more above
- At times between Sun 6:00 pm MDT (00:00 UTC) and 9:00 pm MDT (03:00 UTC): visibility 3 miles, rain, a broken layer at 700 feet
- From Sun 9:00 pm MDT (03:00 UTC): wind from the north-northeast at 5 knots, visibility more than 6 miles, showers nearby, scattered clouds at 1,500 feet, overcast at 2,500 feet
- From Mon 7:00 am MDT (13:00 UTC): wind from the north-northeast at 5 knots, visibility 6 miles, light rain showers, scattered clouds at 1,000 feet, overcast at 1,800 feet
- From Mon 3:00 pm MDT (21:00 UTC): wind from the southwest at 4 knots, visibility more than 6 miles, scattered clouds at 2,500 feet, overcast at 5,000 feet
The forecast for BFI, the departure
- From Sun 5:00 pm PDT (00:00 UTC): wind from the north-northwest at 8 knots, gusting to 18, visibility more than 6 miles, a few clouds at 5,000 feet
- From Sun 7:00 pm PDT (02:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
- From Mon 3:00 am PDT (10:00 UTC): wind light and variable, 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 3 knots, visibility more than 6 miles, clear skies
- From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 3 knots, visibility more than 6 miles, clear skies
- From Mon 2:00 pm PDT (21:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, clear skies
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 BFI 6:27 pm PDT (01:27 UTC), at JAC 6:44 pm MDT (00:44 UTC) (civil twilight ends 7:13 pm MDT (01:13 UTC)). At 120 knots the arrival at JAC is after sunset there (6:46 pm MDT (00:46 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: Boeing Fld/King County International, Jackson Hole Airport.