Boeing Fld/King County International to Kansas City Downtown/Wheeler Field BFI → MKC
1,302 nautical miles (1,499 statute miles) east on a straight line, true course 103°, about 088° magnetic at the departure end (variation 15E). At 120 knots that is 8 h 59 min at the quickest height in today's winds (39,000 ft, a 25-knot tailwind), arriving about 1:05 pm CDT (18:05 UTC). Right now BFI is VFR, wind calm; MKC is VFR, wind from the south-southwest (200°) at 15 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: 3 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 388 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 149 to 477 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 209 to 676 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 route from 268 to 984 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 487 to 686 nm out.
- 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 route from 696 to 835 nm out.
- AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Near the route, 736 nm along the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft (due to mountain wave) from 34,000 ft to 43,000 ft. Near the route, 785 nm along the route.
- AIRMET TANGO 2W: 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 368 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
- E73L descending, 31 nm northeast, 11:20 pm PDT (06:20 UTC): remarks: breaking action good broke out about 600FT above ground. 467 nm along the route, 31 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
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 12 forecast points nearest it (SEA, YKM, GEG, LWS, DLN, BIL, LND, RAP, BFF, ONL, GRI, MKC). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 5,500 ft | 260° at 17 kt | −12 kt | 18 °C | 132 kt | 9 h 52 min | 1:58 pm CDT (18:58 UTC) |
| 7,500 ft | 250° at 15 kt | −10 kt | 6 °C | 130 kt | 10 h 01 min | 2:07 pm CDT (19:07 UTC) |
| 9,500 ft | 250° at 15 kt | −9 kt | 3 °C | 129 kt | 10 h 06 min | 2:12 pm CDT (19:12 UTC) |
| 11,500 ft | 240° at 15 kt | −7 kt | 0 °C | 127 kt | 10 h 15 min | 2:21 pm CDT (19:21 UTC) |
| 13,500 ft | 230° at 15 kt | −6 kt | -4 °C | 126 kt | 10 h 20 min | 2:26 pm CDT (19:26 UTC) |
| 15,500 ft | 230° at 15 kt | −5 kt | -8 °C | 125 kt | 10 h 25 min | 2:31 pm CDT (19:31 UTC) |
| 17,500 ft | 220° at 14 kt | −3 kt | -12 °C | 123 kt | 10 h 35 min | 2:41 pm CDT (19:41 UTC) |
| 18,000 ft FL180 | 220° at 14 kt | −3 kt | -13 °C | 123 kt | 10 h 35 min | 2:41 pm CDT (19:41 UTC) |
| 24,000 ft FL240 | 220° at 27 kt | −7 kt | -25 °C | 127 kt | 10 h 15 min | 2:21 pm CDT (19:21 UTC) |
| 30,000 ft FL300 | 240° at 34 kt | −20 kt | -33 °C | 140 kt | 9 h 18 min | 1:24 pm CDT (18:24 UTC) |
| 34,000 ft FL340 | 240° at 39 kt | −23 kt | -37 °C | 143 kt | 9 h 06 min | 1:12 pm CDT (18:12 UTC) |
| 39,000 ft FL390 | 240° at 43 kt | −25 kt | -44 °C | 145 kt | 8 h 59 min | 1:05 pm CDT (18:05 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; 25 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 50 nm out; 41 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 149 nm out; 54 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 199 nm out; 13 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 348 nm out; 56 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° | ||
| BIL | used from 497 nm out; 88 nm from the line | 300/14 | 270/19 -2° | 260/26 -2° | 220/28 -13° | 210/51 -25° | 220/56 -33° | 220/61 -39° | 220/72 -45° | |
| LND | used from 646 nm out; 104 nm from the line | 240/10 3° | 240/30 0° | 220/42 -13° | 230/52 -23° | 220/54 -33° | 220/52 -36° | 220/53 -44° | ||
| RAP | used from 696 nm out; 129 nm from the line | 250/28 16° | 260/31 10° | 240/25 4° | 210/35 -10° | 200/45 -23° | 230/47 -31° | 230/47 -36° | 230/51 -46° | |
| BFF | used from 795 nm out; 69 nm from the line | 280/28 | 260/39 11° | 240/34 5° | 210/38 -11° | 210/52 -22° | 230/61 -31° | 230/61 -36° | 240/56 -45° | |
| ONL | used from 944 nm out; 106 nm from the line | 250/31 22° | 230/27 16° | 220/25 8° | 230/25 -9° | 220/29 -22° | 250/42 -33° | 250/48 -36° | 250/52 -46° | |
| GRI | used from 994 nm out; 80 nm from the line | 230/39 23° | 230/32 15° | 210/29 7° | 230/31 -8° | 230/43 -21° | 250/52 -31° | 260/59 -35° | 260/59 -46° | |
| MKC | used from 1193 nm out; 85 nm from the line | 240/49 | 240/21 20° | 220/19 13° | 230/21 6° | 260/26 -7° | 250/37 -19° | 270/66 -31° | 270/65 -38° | 280/60 -48° |
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 | calm | 10+ mi | none | 21 ft | 1:53 am PDT (08:53 UTC) |
| MWH Moses Lake, WA | 119 nm out, 10 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 | 229 nm out, 13 nm southwest 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 | 348 nm out, 17 nm north of the line | VFR Sky: overcast at 4,500 feet | calm | 10+ mi | 4,500 ft | 3,635 ft | 08:55 UTC |
| RVF Twin Bridges, MT | 428 nm out, 2 nm east of the line | marginal VFR Sky: scattered clouds at 2,000 feet, overcast at 2,700 feet | from the north-northeast (020°) at 14 knots | 10+ mi | 2,700 ft | 4,788 ft | 08:55 UTC |
| COD Cody, WY | 577 nm out, 8 nm south of the line | marginal VFR Sky: overcast at 1,100 feet | from the north-northeast (020°) at 11 knots | 10+ mi | 1,100 ft | 5,102 ft | 08:56 UTC |
| BYG Buffalo, WY | 676 nm out, 25 nm north of the line | marginal VFR Sky: overcast at 1,600 feet | from the north-northwest (330°) at 14 knots, gusting to 26 | 10+ mi | 1,600 ft | 4,970 ft | 08:53 UTC |
| CDR Chadron, NE | 855 nm out, 8 nm northeast of the line | low IFR Sky: overcast at 200 feet Weather: mist | from the north-northeast (030°) at 10 knots | 2.5 mi | 200 ft | 3,297 ft | 08:53 UTC |
| BBW Broken Bow, NE | 1034 nm out, 4 nm north of the line | VFR | calm | 10+ mi | none | 2,546 ft | 08:53 UTC |
| GRI Grand Island, NE | 1104 nm out, 9 nm north of the line, tower | VFR | from the south (180°) at 14 knots | 10+ mi | none | 1,847 ft | 08:53 UTC |
| FLV Fort Leavenworth, KS | 1283 nm out, 5 nm northeast of the line | no report just now | 771 ft | ||||
| MKC Kansas City, MO | destination | VFR | from the south-southwest (200°) at 15 knots | 10+ mi | none | 756 ft | 3:54 am CDT (08:54 UTC) |
The highest airport on this list sits at 5,102 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At MKC when you get there the forecast at the estimated arrival, 1:05 pm CDT (18:05 UTC)
Wind from the south-southwest at 15 knots, gusting to 25, visibility more than 6 miles, scattered clouds at 25,000 feet VFR
The whole forecast for MKC
- From Mon 1:00 am CDT (06:00 UTC): wind from the south at 10 knots, gusting to 18, visibility more than 6 miles, a few clouds at 25,000 feet
- From Mon 9:00 am CDT (14:00 UTC): wind from the south-southwest at 15 knots, gusting to 25, visibility more than 6 miles, scattered clouds at 25,000 feet
- From Mon 6:00 pm CDT (23:00 UTC): wind from the south-southwest at 10 knots, gusting to 18, visibility more than 6 miles, a few clouds at 25,000 feet
The forecast for BFI, the departure
- From Mon 2:00 am PDT (09:00 UTC): wind light and variable, 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
- From Mon 7:00 pm PDT (02:00 UTC): wind calm, 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 6:25 pm PDT (01:25 UTC), at MKC 6:44 pm CDT (23:44 UTC) (civil twilight ends 7:11 pm CDT (00:11 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, Kansas City Downtown/Wheeler Field.