Plan a flight · Sun 8:39 pm MDT (02:39 UTC)

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 17 min at the quickest height in today's winds (24,000 ft, a 3-knot tailwind), arriving about 1:56 am PDT (08:56 UTC), after sunset at the destination. Right now HDN is VFR, wind from the west (280°) at 4 knots; SEA is VFR, wind from the north (360°) at 7 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: 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

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 198 nm of the route.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the first 476 nm of the route.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 228 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 30 to 119 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 50 to 436 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 50 to 595 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 198 to 436 nm out.
AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 456 to 674 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 139 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 HDN.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

E75L at 28,000 ft, 28 nm south, 7:31 pm MDT (01:31 UTC): moderate turbulence, remarks: ZDVWC-03. At the departure end, 28 nm south of the line.
as filed, and in English
```
EEO UA /OV EKR085036/TM 0131/FL280/TP E75L/TB MOD/RM ZDVWC-03
```
Report
a routine report filed through EEO
Where
36 nm east (085°) of EKR
Time
01:31 UTC
Height
at 28,000 ft
Aircraft
E75L
Turbulence
moderate
Remarks
ZDVWC-03
B39M at 32,000 ft, 40 nm east, 5:58 pm MDT (23:58 UTC): moderate chop turbulence, no icing, remarks: moderate mtw a 30-knot loss of airspeed ZDVWC-14. At the departure end, 40 nm east of the line.
as filed, and in English
```
EEO UA /OV EKR069073/TM 2358/FL320/TP B39M/TB OCNL MOD CHOP/IC NEG/RM MOD MTW +/-30KT ZDVWC-14
```
Report
a routine report filed through EEO
Where
73 nm east (069°) of EKR
Time
23:58 UTC
Height
at 32,000 ft
Aircraft
B39M
Turbulence
occasional moderate chop
Icing
none
Remarks
moderate mtw a 30-knot loss of airspeed ZDVWC-14
UAL796 at 30,000 ft, 39 nm southwest, 6:09 pm MDT (00:09 UTC): light chop turbulence, wind 230° at 42 knots. At the departure end, 39 nm southwest of the line.
as filed, and in English
```
ARP UAL796 4004N 10755W 0009 F300 230/042KT TB OCNL LGT CHOP IC
```
Report
a routine report filed through ARP
UAL2395 at 37,000 ft, 6 nm east, 6:58 pm MDT (00:58 UTC): no turbulence, wind 240° at 70 knots. 109 nm along the route, 6 nm east of the line.
as filed, and in English
```
ARP UAL2395 4135N 10900W 0058 F370 240/070KT TB NONE SK CLEAR IC NONE
```
Report
a routine report filed through ARP
PC12 at 15,000 ft, 33 nm northeast, 5:47 pm MDT (23:47 UTC): light rime icing above 15,000 ft. 238 nm along the route, 33 nm northeast 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
PC12 at 6,000 ft, 35 nm southwest, 7:09 pm MDT (01:09 UTC): scattered clouds up to 6,000 ft, remarks: multiple scattered layers during the descent runway 31. 367 nm along the route, 35 nm southwest of the line.
as filed, and in English
```
SUN UA /OV KSUN/TM 0109/FL060/TP PC12/SK SCT-TOP060/WX FV05SM/RM MULTIPLE SCT LAYERS DURD RY31
```
Report
a routine report filed through SUN
Where
over KSUN
Time
01:09 UTC
Height
at 6,000 ft
Aircraft
PC12
Sky
scattered clouds, tops 6,000 ft
Weather
flight visibility 5 miles
Remarks
multiple scattered layers during the descent runway 31
PC12 at 6,000 ft, 9 nm south, 6:56 pm MDT (00:56 UTC): overcast above 6,000 ft. 595 nm along the route, 9 nm south of the line.
as filed, and in English
```
ALW UA /OV ALW200015/TM 0056/FL060/TP PC12/SK OVC060
```
Report
a routine report filed through ALW
Where
15 nm south (200°) of ALW
Time
00:56 UTC
Height
at 6,000 ft
Aircraft
PC12
Sky
overcast from 6,000 ft
PC12 at 13,500 ft, 25 nm northeast, 7:08 pm MDT (01:08 UTC): no turbulence, a trace of icing, overcast from 9,000 ft to 13,500 ft, -10 °C. 634 nm along the route, 25 nm northeast of the line.
as filed, and in English
```
PSC UA /OV PSC360025/TM 0108/FL135/TP PC12/SK OVC090-TOP135/TA M10/TB NEG /IC TRACE RM 135-090
```
Report
a routine report filed through PSC
Where
25 nm north (360°) of PSC
Time
01:08 UTC
Height
at 13,500 ft
Aircraft
PC12
Sky
overcast from 9,000 ft, tops 13,500 ft
Temperature
−10 °C
Turbulence
none
Icing
trace remarks from 13,500 ft to 9,000 ft
C337 at 12,000 ft, 28 nm south, 7:18 pm MDT (01:18 UTC): light rime icing, -12 °C, remarks: zse. 674 nm along the route, 28 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM155020/TM 0118/FL120/TP C337/TA M12/IC LGT RIME/RM ZSE
```
Report
a routine report filed through YKM
Where
20 nm southeast (155°) of YKM
Time
01:18 UTC
Height
at 12,000 ft
Aircraft
C337
Temperature
−12 °C
Icing
light rime
Remarks
zse
A321 at 13,500 ft, 18 nm south, 7:54 pm MDT (01:54 UTC): remarks: zse. 733 nm along the route, 18 nm south of the line.
as filed, and in English
```
SEA UA /OV SEA120045/TM 0154/FL135/TP A321/SK TOP130/RM ZSE
```
Report
a routine report filed through SEA
Where
45 nm southeast (120°) of SEA
Time
01:54 UTC
Height
at 13,500 ft
Aircraft
A321
Sky
TOP130
Remarks
zse
PC12 at 15,000 ft, 18 nm south, 6:42 pm MDT (00:42 UTC): remarks: zse. 733 nm along the route, 18 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL150/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 15,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse
PC12 at 13,000 ft, 18 nm south, 6:42 pm MDT (00:42 UTC): remarks: zse. 733 nm along the route, 18 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL130/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 13,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse
SB20 at 16,000 ft, 43 nm northeast, 7:52 pm MDT (01:52 UTC): remarks: zse. At the destination end, 43 nm northeast of the line.
as filed, and in English
```
PAE UA /OV PAE075045/TM 0152/FL160/TP SB20/SK TOP120/RM ZSE
```
Report
a routine report filed through PAE
Where
45 nm east (075°) of PAE
Time
01:52 UTC
Height
at 16,000 ft
Aircraft
SB20
Sky
TOP120
Remarks
zse

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 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	050° at 5 kt	−1 kt	2 °C	121 kt	6 h 23 min	2:02 am PDT (09:02 UTC)
6,500 ft	030° at 6 kt	0	-1 °C	120 kt	6 h 26 min	2:05 am PDT (09:05 UTC)
8,500 ft	210° at 6 kt	−1 kt	-5 °C	121 kt	6 h 23 min	2:02 am PDT (09:02 UTC)
10,500 ft	230° at 8 kt	+1 kt	-6 °C	119 kt	6 h 30 min	2:09 am PDT (09:09 UTC)
12,500 ft	230° at 11 kt	+1 kt	-7 °C	119 kt	6 h 30 min	2:09 am PDT (09:09 UTC)
14,500 ft	220° at 14 kt	0	-10 °C	120 kt	6 h 26 min	2:05 am PDT (09:05 UTC)
16,500 ft	220° at 17 kt	−1 kt	-14 °C	121 kt	6 h 23 min	2:02 am PDT (09:02 UTC)
18,000 ft FL180	210° at 19 kt	−1 kt	-16 °C	121 kt	6 h 23 min	2:02 am PDT (09:02 UTC)
24,000 ft FL240	210° at 25 kt	−3 kt	-27 °C	123 kt	6 h 17 min	1:56 am PDT (08:56 UTC)
30,000 ft FL300	230° at 30 kt	+5 kt	-32 °C	115 kt	6 h 43 min	2:22 am PDT (09:22 UTC)
34,000 ft FL340	230° at 36 kt	+8 kt	-36 °C	112 kt	6 h 54 min	2:33 am PDT (09:33 UTC)
39,000 ft FL390	230° at 39 kt	+9 kt	-42 °C	111 kt	6 h 58 min	2:37 am PDT (09:37 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
RKS	used from 0 nm out; 82 nm from the line			200/41	220/44 1°	220/35 -11°	220/46 -24°	210/53 -27°	220/62 -35°	230/61 -44°
PIH	used from 198 nm out; 62 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°
BOI	used from 396 nm out; 78 nm from the line		300/7 2°	280/5 -4°	210/16 -9°	210/60 -20°	210/75 -29°	210/63 -32°	220/64 -32°	220/54 -39°
LWS	used from 495 nm out; 59 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°
YKM	used from 595 nm out; 66 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°
SEA	used from 743 nm out; 15 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
HDN Hayden, CO	departure	VFR Sky: a broken layer at 7,000 feet, overcast at 9,000 feet	from the west (280°) at 4 knots	10+ mi	7,000 ft	6,606 ft	7:56 pm MDT (01:56 UTC)
DWX Dixon, WY	30 nm out, 19 nm northeast of the line	VFR	from the southeast (130°) at 15 knots, gusting to 27	10+ mi	none	6,548 ft	02:15 UTC
RKS Rock Springs, WY	109 nm out, 3 nm east of the line	VFR Sky: a few clouds at 11,000 feet	from the south (190°) at 13 knots, gusting to 20	10+ mi	none	6,764 ft	01:54 UTC
AFO Afton, WY	218 nm out, 9 nm northeast of the line	marginal VFR Sky: a broken layer at 2,200 feet, a broken layer at 2,900 feet, overcast at 4,200 feet	calm	10+ mi	2,200 ft	6,220 ft	02:15 UTC
IDA Idaho Falls, ID	277 nm out, 20 nm north of the line, tower	VFR Sky: scattered clouds at 1,000 feet, overcast at 9,500 feet	from the east-northeast (060°) at 5 knots	10+ mi	9,500 ft	4,743 ft	02:29 UTC
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	marginal VFR Sky: scattered clouds at 1,900 feet, overcast at 2,800 feet Weather: light rain	from the north-northwest (340°) at 9 knots	10+ mi	2,800 ft	5,075 ft	01:55 UTC
MYL Mc Call, ID	476 nm out, 7 nm south of the line	VFR Sky: a broken layer at 3,300 feet, a broken layer at 4,000 feet, overcast at 6,000 feet	from the west-northwest (290°) at 7 knots	10+ mi	3,300 ft	5,024 ft	01:51 UTC
ALW Walla Walla, WA	585 nm out, 9 nm north of the line, tower	VFR Sky: scattered clouds at 5,500 feet, overcast at 8,000 feet	from the south-southwest (210°) at 4 knots	10+ mi	8,000 ft	1,194 ft	01:53 UTC
PSC Pasco, WA	624 nm out, 1 nm southeast of the line, tower	VFR Sky: overcast at 9,000 feet	from the north (010°) at 7 knots	10+ mi	9,000 ft	410 ft	01:53 UTC
ESW Easton, WA	723 nm out, 11 nm north of the line	no report just now				2,226 ft
SEA Seattle, WA	destination	VFR Sky: a few clouds at 3,000 feet	from the north (360°) at 7 knots	10+ mi	none	432 ft	6:53 pm PDT (01:53 UTC)

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, 1:56 am PDT (08:56 UTC)

Wind from the northeast at 6 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for SEA

From Sun 5:00 pm PDT (00:00 UTC): wind from the north at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 2,000 feet, a few clouds at 5,000 feet
From Sun 8:00 pm PDT (03:00 UTC): wind from the 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 northwest at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

The forecast for HDN, the departure

From Sun 6:00 pm MDT (00:00 UTC): wind from the southwest at 14 knots, gusting to 24, visibility more than 6 miles, a few clouds at 8,000 feet, scattered clouds at 10,000 feet
At times between Sun 6:00 pm MDT (00:00 UTC) and 8:00 pm MDT (02:00 UTC): visibility 6 miles, light rain showers, a broken layer at 8,000 feet
From Sun 8:00 pm MDT (02:00 UTC): wind from the south at 13 knots, gusting to 26, visibility more than 6 miles, low-level wind shear, a few clouds at 5,000 feet, scattered clouds at 12,000 feet
From Mon 12:00 am MDT (06:00 UTC): wind from the south at 13 knots, gusting to 28, visibility more than 6 miles, low-level wind shear, a few clouds at 5,000 feet, scattered clouds at 10,000 feet
From Mon 7:00 am MDT (13:00 UTC): wind from the south at 9 knots, visibility more than 6 miles, scattered clouds at 4,000 feet, a broken layer at 5,000 feet
30% chance between Mon 12:00 pm MDT (18:00 UTC) and 6:00 pm MDT (00:00 UTC): visibility 4 miles, light rain showers, overcast at 2,600 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 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 before sunrise there (7:23 am PDT (14:23 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

Radar now, the southern Rockies · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the Pacific Northwest · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

Forecast chart, 24 hours ahead Weather Prediction Center

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.