South Big Horn County to Ketchikan International GEY → KTN
1,112 nautical miles (1,280 statute miles) northwest on a straight line, true course 314°, about 304° magnetic at the departure end (variation 10E). At 120 knots that is 8 h 50 min at the quickest height in today's winds (4,500 ft, a 6-knot tailwind), arriving about 3:33 am AKDT (11:33 UTC), after sunset at the destination. Right now GEY is marginal VFR, wind from the northwest (320°) at 9 knots; KTN is VFR, wind from the south-southeast (150°) 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: 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 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 308 nm of the route.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the first 79 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the first 387 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 89 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the first 377 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 179 to 397 nm out.
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 GEY.
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 02:00–09:00 UTC · at 120 knots true airspeed
The westbound cruising heights for this course (VFR: even 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 (BIL, GTF, GPI, GEG, SEA). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 4,500 ft | 070° at 12 kt | −6 kt | -3 °C | 126 kt | 8 h 50 min | 3:33 am AKDT (11:33 UTC) |
| 6,500 ft | 070° at 13 kt | −6 kt | -2 °C | 126 kt | 8 h 50 min | 3:33 am AKDT (11:33 UTC) |
| 8,500 ft | 070° at 11 kt | −6 kt | -5 °C | 126 kt | 8 h 50 min | 3:33 am AKDT (11:33 UTC) |
| 10,500 ft | 060° at 11 kt | −6 kt | -6 °C | 126 kt | 8 h 50 min | 3:33 am AKDT (11:33 UTC) |
| 12,500 ft | 050° at 11 kt | −5 kt | -8 °C | 125 kt | 8 h 54 min | 3:37 am AKDT (11:37 UTC) |
| 14,500 ft | 030° at 10 kt | −2 kt | -11 °C | 122 kt | 9 h 07 min | 3:50 am AKDT (11:50 UTC) |
| 16,500 ft | 010° at 9 kt | +1 kt | -14 °C | 119 kt | 9 h 21 min | 4:04 am AKDT (12:04 UTC) |
| 18,000 ft FL180 | 360° at 10 kt | +3 kt | -16 °C | 117 kt | 9 h 30 min | 4:13 am AKDT (12:13 UTC) |
| 24,000 ft FL240 | 010° at 9 kt | 0 | -26 °C | 120 kt | 9 h 16 min | 3:59 am AKDT (11:59 UTC) |
| 30,000 ft FL300 | 320° at 14 kt | +9 kt | -38 °C | 111 kt | 10 h 01 min | 4:44 am AKDT (12:44 UTC) |
| 34,000 ft FL340 | 300° at 18 kt | +13 kt | -42 °C | 107 kt | 10 h 24 min | 5:07 am AKDT (13:07 UTC) |
| 39,000 ft FL390 | 250° at 26 kt | +10 kt | -43 °C | 110 kt | 10 h 07 min | 4:50 am AKDT (12:50 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BIL | used from 0 nm out; 60 nm from the line | 080/13 | 180/9 -2° | 210/38 0° | 220/51 -11° | 210/46 -22° | 210/58 -35° | 230/73 -39° | 230/72 -45° | |
| GTF | used from 149 nm out; 60 nm from the line | 070/11 | 080/15 -7° | 110/19 -9° | 190/25 -14° | 200/34 -23° | 200/54 -39° | 220/66 -40° | 220/77 -44° | |
| GPI | used from 298 nm out; 19 nm from the line | 070/19 -5° | 100/16 -7° | 080/10 -8° | 130/8 -19° | 170/37 -28° | 200/50 -40° | 210/43 -40° | 220/41 -42° | |
| GEG | used from 447 nm out; 127 nm from the line | 080/16 -2° | 050/17 -7° | 080/9 -10° | 190/33 -21° | 180/31 -32° | L/V -35° | L/V -37° | 270/8 -40° | |
| SEA | used from 645 nm out; 256 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° |
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 |
|---|---|---|---|---|---|---|---|
| GEY Greybull, WY | departure | marginal VFR Sky: overcast at 1,100 feet | from the northwest (320°) at 9 knots | 10+ mi | 1,100 ft | 3,941 ft | 8:31 pm MDT (02:31 UTC) |
| POY Powell, WY | 40 nm out, 7 nm south of the line | low IFR Sky: overcast at 300 feet Weather: unknown precipitation | from the northwest (320°) at 20 knots, gusting to 24 | 3 mi | 300 ft | 5,096 ft | 02:10 UTC |
| HLN Helena, MT | 209 nm out, 20 nm southwest of the line, tower | low IFR Sky: sky obscured at 1,000 feet Weather: light snow, mist | from the west (280°) at 8 knots | 0.75 mi | 1,000 ft | 3,877 ft | 02:32 UTC |
| GPI Kalispell, MT | 338 nm out, 5 nm west of the line, tower | VFR Sky: overcast at 4,100 feet | from the north-northeast (030°) at 12 knots | 10+ mi | 4,100 ft | 2,976 ft | 01:55 UTC |
| CYXT Terrace, | 993 nm out, 2 nm northeast of the line | VFR Sky: a few clouds at 13,000 feet, a broken layer at 16,000 feet, a broken layer at 24,000 feet | from the north-northeast (020°) at 6 knots | 20 mi | 16,000 ft | 713 ft | 02:00 UTC |
| KTN Ketchikan, AK | destination | VFR Sky: overcast at 6,500 feet | from the south-southeast (150°) at 4 knots | 10+ mi | 6,500 ft | 92 ft | 5:53 pm AKDT (01:53 UTC) |
The highest airport on this list sits at 5,096 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At KTN when you get there the forecast at the estimated arrival, 3:33 am AKDT (11:33 UTC)
Wind from the southeast at 7 knots, visibility more than 6 miles, light rain, overcast at 2,000 feet marginal VFR
The whole forecast for KTN
- From Sun 4:00 pm AKDT (00:00 UTC): wind from the southeast at 4 knots, visibility more than 6 miles, light rain, scattered clouds at 6,000 feet, overcast at 9,000 feet
- From Sun 7:00 pm AKDT (03:00 UTC): wind from the southeast at 7 knots, visibility more than 6 miles, a broken layer at 4,000 feet, overcast at 7,000 feet
- 30% chance between Sun 10:00 pm AKDT (06:00 UTC) and 1:00 am AKDT (09:00 UTC): light rain, a broken layer at 3,500 feet
- From Mon 1:00 am AKDT (09:00 UTC): wind from the southeast at 7 knots, visibility more than 6 miles, light rain, overcast at 2,000 feet
- From Mon 7:00 am AKDT (15:00 UTC): wind from the southeast at 6 knots, visibility more than 6 miles, light rain, a broken layer at 2,000 feet, overcast at 5,000 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 GEY 6:33 pm MDT (00:33 UTC), at KTN 5:54 pm AKDT (01:54 UTC) (civil twilight ends 6:31 pm AKDT (02:31 UTC)). At 120 knots the arrival at KTN is before sunrise there (7:10 am AKDT (15:10 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: South Big Horn County, Ketchikan International.