Yampa Valley Airport to Seattle-Tacoma International HDN → SEA
773 nautical miles (889 statute miles) northwest on a straight line, true course 308°, about 298° magnetic at the departure end (variation 10E). At 120 knots that is 6 h 11 min at the quickest height in today's winds (16,500 ft, a 5-knot tailwind), arriving about 10:59 pm PDT (05:59 UTC), after sunset at the destination. 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: 85 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
- SIGMET W66W: thunderstorms (a convective SIGMET) up to 38,000 ft, moving from the southwest at 40 knots, until 6:55 pm MDT (00:55 UTC). Over the route from 109 to 109 nm out.
as issued
WSUS33 KKCI 112255 MKCW WST 112255 CONVECTIVE SIGMET 66W VALID UNTIL 0055Z CO WY UT FROM 10NW OCS-60W CHE-50ESE MTU-50N MTU-10NW OCS AREA TS MOV FROM 21040KT. TOPS TO FL380.
- SIGMET W67W: thunderstorms (a convective SIGMET) up to 28,000 ft, moving from the south at 40 knots, until 6:55 pm MDT (00:55 UTC). Over the route from 208 to 277 nm out.
as issued
WSUS33 KKCI 112255 MKCW WST 112255 CONVECTIVE SIGMET 67W VALID UNTIL 0055Z WY UT ID NV FROM 40S DBS-40WNW BPI-50N HVE-50W DTA-50SSE TWF-40S DBS AREA EMBD TS MOV FROM 20040KT. TOPS TO FL280.
- 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 first 238 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the first 515 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 258 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the first 604 nm of the route.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 40 to 99 nm out.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 119 to 396 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 208 to 495 nm out.
- AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 466 to 654 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 HDN.
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 20:00–03:00 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 6 forecast points nearest it (RKS, PIH, BOI, LWS, YKM, 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 | 350° at 8 kt | +5 kt | 4 °C | 115 kt | 6 h 43 min | 11:31 pm PDT (06:31 UTC) |
| 6,500 ft | 350° at 9 kt | +5 kt | 0 °C | 115 kt | 6 h 43 min | 11:31 pm PDT (06:31 UTC) |
| 8,500 ft | 200° at 5 kt | −2 kt | -5 °C | 122 kt | 6 h 20 min | 11:08 pm PDT (06:08 UTC) |
| 10,500 ft | 210° at 12 kt | −3 kt | -5 °C | 123 kt | 6 h 17 min | 11:05 pm PDT (06:05 UTC) |
| 12,500 ft | 210° at 19 kt | −3 kt | -6 °C | 123 kt | 6 h 17 min | 11:05 pm PDT (06:05 UTC) |
| 14,500 ft | 210° at 22 kt | −4 kt | -9 °C | 124 kt | 6 h 14 min | 11:02 pm PDT (06:02 UTC) |
| 16,500 ft | 210° at 25 kt | −5 kt | -13 °C | 125 kt | 6 h 11 min | 10:59 pm PDT (05:59 UTC) |
| 18,000 ft FL180 | 210° at 27 kt | −5 kt | -16 °C | 125 kt | 6 h 11 min | 10:59 pm PDT (05:59 UTC) |
| 24,000 ft FL240 | 210° at 25 kt | −2 kt | -25 °C | 122 kt | 6 h 20 min | 11:08 pm PDT (06:08 UTC) |
| 30,000 ft FL300 | 210° at 31 kt | −4 kt | -34 °C | 124 kt | 6 h 14 min | 11:02 pm PDT (06:02 UTC) |
| 34,000 ft FL340 | 230° at 44 kt | +9 kt | -37 °C | 111 kt | 6 h 58 min | 11:46 pm PDT (06:46 UTC) |
| 39,000 ft FL390 | 240° at 49 kt | +18 kt | -43 °C | 102 kt | 7 h 35 min | 12:23 am PDT (07:23 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| RKS | used from 0 nm out; 82 nm from the line | 190/43 | 210/65 3° | 210/57 -9° | 210/56 -21° | 210/47 -33° | 230/63 -37° | 240/77 -46° | ||
| PIH | used from 198 nm out; 62 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° | |
| BOI | used from 396 nm out; 78 nm from the line | 330/14 4° | 230/5 -2° | 220/20 -7° | 210/37 -20° | 200/59 -26° | 200/67 -34° | 210/73 -35° | 220/62 -41° | |
| LWS | used from 495 nm out; 59 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° |
| YKM | used from 595 nm out; 66 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° |
| SEA | used from 743 nm out; 15 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° |
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 |
|---|---|---|---|---|---|---|---|
| HDN Hayden, CO | departure | no report just now | 6,606 ft | ||||
| DWX Dixon, WY | 30 nm out, 19 nm northeast of the line | no report just now | 6,548 ft | ||||
| RKS Rock Springs, WY | 109 nm out, 3 nm east of the line | no report just now | 6,764 ft | ||||
| AFO Afton, WY | 218 nm out, 9 nm northeast of the line | no report just now | 6,220 ft | ||||
| IDA Idaho Falls, ID | 277 nm out, 20 nm north of the line, tower | no report just now | 4,743 ft | ||||
| AOC Arco, ID | 327 nm out, 8 nm southwest of the line | no report just now | 5,334 ft | ||||
| LLJ Challis, ID | 396 nm out, 18 nm northeast of the line | no report just now | 5,075 ft | ||||
| MYL Mc Call, ID | 476 nm out, 7 nm south of the line | no report just now | 5,024 ft | ||||
| ALW Walla Walla, WA | 585 nm out, 9 nm north of the line, tower | no report just now | 1,194 ft | ||||
| PSC Pasco, WA | 624 nm out, 1 nm southeast of the line, tower | no report just now | 410 ft | ||||
| ESW Easton, WA | 723 nm out, 11 nm north of the line | no report just now | 2,226 ft | ||||
| SEA Seattle, WA | destination | no report just now | 432 ft |
The highest airport on this list sits at 6,764 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At SEA when you get there the forecast at the estimated arrival, 10:59 pm PDT (05:59 UTC)
SEA has no terminal forecast; use the nearest airport that does.
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 HDN 6:33 pm MDT (00:33 UTC), at SEA 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 UTC)). At 120 knots the arrival at SEA is after sunset there (6:29 pm PDT (01:29 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: Yampa Valley Airport, Seattle-Tacoma International.