Plan a flight · Mon 2:05 am PDT (09:05 UTC)

Seattle-Tacoma International to Appleton International SEA → ATW

1,415 nautical miles (1,628 statute miles) east on a straight line, true course 085°, about 069° magnetic at the departure end (variation 16E). At 120 knots that is 8 h 44 min at the quickest height in today's winds (39,000 ft, a 42-knot tailwind), arriving about 12:49 pm CDT (17:49 UTC). Right now SEA is VFR, wind calm; ATW is VFR, wind from the south (190°) at 6 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 18,000 ft to 39,000 ft. Over the first 399 nm of the route.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 189 to 707 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 259 to 538 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 269 to 1126 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 717 to 767 nm out.
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 149 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 SEA.

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

BE20 at 15,000 ft, 2 nm southwest, 1:00 am PDT (08:00 UTC): light icing, 0 °C. 797 nm along the route, 2 nm southwest of the line.
as filed, and in English
```
DIK UA /OV DIK/TM 0800/FL150/TP BE20/TA 00/IC LGT CLR
```
Report
a routine report filed through DIK
Where
over DIK
Time
08:00 UTC
Height
at 15,000 ft
Aircraft
BE20
Temperature
0 °C
Icing
light clear
B39M at 35,000 ft, 42 nm north, 1:30 am PDT (08:30 UTC): light chop turbulence above 35,000 ft. 1036 nm along the route, 42 nm north of the line.
as filed, and in English
```
FAR UA /OV FAR/TM 0830/FL350/TP B39M/TB CONS LGT CHOP 350
```
Report
a routine report filed through FAR
Where
over FAR
Time
08:30 UTC
Height
at 35,000 ft
Aircraft
B39M
Turbulence
continuous light chop at 35,000 ft

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 13 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, MLS, DIK, ABR, AXN, MSP, LSE, GRB). 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	240° at 4 kt	−3 kt	-1 °C	123 kt	11 h 30 min	3:35 pm CDT (20:35 UTC)
7,500 ft	230° at 7 kt	−4 kt	5 °C	124 kt	11 h 25 min	3:30 pm CDT (20:30 UTC)
9,500 ft	230° at 10 kt	−6 kt	2 °C	126 kt	11 h 14 min	3:19 pm CDT (20:19 UTC)
11,500 ft	240° at 11 kt	−8 kt	-1 °C	128 kt	11 h 03 min	3:08 pm CDT (20:08 UTC)
13,500 ft	240° at 13 kt	−9 kt	-4 °C	129 kt	10 h 58 min	3:03 pm CDT (20:03 UTC)
15,500 ft	240° at 14 kt	−11 kt	-8 °C	131 kt	10 h 48 min	2:53 pm CDT (19:53 UTC)
17,500 ft	240° at 16 kt	−12 kt	-12 °C	132 kt	10 h 43 min	2:48 pm CDT (19:48 UTC)
18,000 ft FL180	240° at 16 kt	−12 kt	-13 °C	132 kt	10 h 43 min	2:48 pm CDT (19:48 UTC)
24,000 ft FL240	240° at 22 kt	−18 kt	-25 °C	138 kt	10 h 15 min	2:20 pm CDT (19:20 UTC)
30,000 ft FL300	240° at 25 kt	−19 kt	-37 °C	139 kt	10 h 11 min	2:16 pm CDT (19:16 UTC)
34,000 ft FL340	250° at 37 kt	−31 kt	-40 °C	151 kt	9 h 22 min	1:27 pm CDT (18:27 UTC)
39,000 ft FL390	250° at 47 kt	−42 kt	-45 °C	162 kt	8 h 44 min	12:49 pm CDT (17:49 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; 58 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 100 nm out; 69 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°
GPI	used from 249 nm out; 66 nm from the line		090/8 -4°	140/7 -7°	090/10 -8°	110/10 -19°	210/25 -30°	200/24 -40°	210/31 -39°	210/35 -42°
GTF	used from 399 nm out; 21 nm from the line		L/V	L/V -7°	240/8 -8°	240/30 -14°	240/40 -28°	210/52 -38°	210/76 -38°	220/72 -43°
GGW	used from 548 nm out; 81 nm from the line		100/7 -1°	070/10 -3°	190/6 -4°	210/34 -10°	230/33 -24°	210/48 -37°	230/65 -40°	230/71 -46°
MLS	used from 648 nm out; 46 nm from the line		290/17 -1°	250/18 0°	230/25 0°	220/31 -11°	220/32 -24°	220/50 -32°	220/60 -38°	230/71 -46°
DIK	used from 747 nm out; 24 nm from the line		190/12 5°	230/29 7°	220/33 1°	220/43 -11°	210/47 -23°	220/53 -33°	240/56 -40°	250/72 -47°
ABR	used from 897 nm out; 85 nm from the line	080/12	210/12 17°	220/22 12°	230/26 5°	220/28 -10°	230/41 -21°	250/36 -36°	260/47 -39°	260/63 -47°
AXN	used from 1046 nm out; 37 nm from the line	110/6	260/10 16°	240/17 12°	250/20 5°	260/29 -10°	260/35 -22°	260/29 -38°	270/48 -41°	270/61 -48°
MSP	used from 1146 nm out; 49 nm from the line	250/12	250/17 17°	240/26 12°	250/26 5°	280/26 -9°	280/32 -22°	270/37 -38°	280/47 -41°	280/55 -48°
LSE	used from 1295 nm out; 60 nm from the line	250/25	240/21 17°	240/28 11°	250/28 5°	280/24 -10°	280/31 -21°	260/35 -37°	270/45 -43°	280/59 -47°
GRB	used from 1345 nm out; 59 nm from the line	250/32	250/22 17°	240/18 8°	280/21 6°	280/34 -11°	280/35 -21°	280/39 -37°	270/52 -45°	290/60 -49°

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
SEA Seattle, WA	departure	VFR	calm	10+ mi	none	432 ft	1:53 am PDT (08:53 UTC)
MWH Moses Lake, WA	120 nm out, 22 nm south of the line, tower	VFR	from the north-northwest (340°) at 8 knots	10+ mi	none	1,188 ft	08:52 UTC
GEG Spokane, WA	189 nm out, 5 nm east of the line, tower	VFR Sky: a few clouds at 5,500 feet, scattered clouds at 7,000 feet, a broken layer at 9,000 feet	from the northeast (040°) at 5 knots	10+ mi	9,000 ft	2,385 ft	08:53 UTC
THM Thompson Falls, MT	289 nm out, 5 nm southwest of the line	no report just now				2,467 ft
GTF Great Falls, MT	448 nm out, 6 nm southwest of the line, tower	low IFR Sky: a broken layer at 300 feet, overcast at 1,100 feet Weather: light snow, mist	from the north-northwest (340°) at 7 knots	5 mi	300 ft	3,680 ft	08:53 UTC
GDV Glendive, MT	707 nm out, 5 nm east of the line	low IFR Sky: overcast at 400 feet Weather: light rain	from the northeast (040°) at 11 knots	10+ mi	400 ft	2,458 ft	08:56 UTC
DIK Dickinson, ND	797 nm out, 6 nm southwest of the line	low IFR Sky: sky obscured at 300 feet Weather: mist	from the east-northeast (060°) at 13 knots	0.75 mi	300 ft	2,592 ft	08:56 UTC
BIS Bismarck, ND	877 nm out, 8 nm northeast of the line, tower	IFR Sky: overcast at 800 feet	from the northeast (040°) at 8 knots	10+ mi	800 ft	1,661 ft	08:52 UTC
AXN Alexandria, MN	1106 nm out, 5 nm northeast of the line	VFR	from the northeast (040°) at 7 knots	10+ mi	none	1,425 ft	08:53 UTC
STC St Cloud, MN	1166 nm out, 2 nm northeast of the line, tower	VFR	calm	10+ mi	none	1,030 ft	08:53 UTC
EAU Eau Claire, WI	1285 nm out, 7 nm southwest of the line, tower	VFR	from the south-southwest (200°) at 3 knots	10+ mi	none	913 ft	08:56 UTC
ATW Appleton, WI	destination	VFR	from the south (190°) at 6 knots	10+ mi	none	918 ft	3:55 am CDT (08:55 UTC)

The highest airport on this list sits at 3,680 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At ATW when you get there the forecast at the estimated arrival, 12:49 pm CDT (17:49 UTC)

Wind from the southwest at 8 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for ATW

From Mon 1:00 am CDT (06:00 UTC): wind from the south-southwest at 7 knots, visibility more than 6 miles, low-level wind shear, a broken layer at 25,000 feet
From Mon 5:00 am CDT (10:00 UTC): wind from the south-southwest at 7 knots, visibility more than 6 miles, a broken layer at 20,000 feet
From Mon 11:00 am CDT (16:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, clear skies
From Mon 5:00 pm CDT (22:00 UTC): wind from the south-southwest at 5 knots, visibility more than 6 miles, scattered clouds at 6,000 feet, scattered clouds at 15,000 feet
30% chance between Mon 6:00 pm CDT (23:00 UTC) and 9:00 pm CDT (02:00 UTC): light rain showers, a broken layer at 6,000 feet
From Mon 9:00 pm CDT (02:00 UTC): wind from the south-southwest at 5 knots, visibility more than 6 miles, scattered clouds at 7,000 feet

The forecast for SEA, the departure

From Mon 2:00 am PDT (09:00 UTC): wind light and variable, visibility more than 6 miles, 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 south at 4 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

Temporary flight restrictions on the line or within 25 nm of it

6/6656 ANOKA, MN, Monday, October 5, 2026 through Monday, October 19, 2026 Local 11 nm from the route, 1196 nm along the route · security · until 19 October · ZMP

Daylight

Sunset at SEA 6:25 pm PDT (01:25 UTC), at ATW 6:15 pm CDT (23:15 UTC) (civil twilight ends 6:44 pm CDT (23:44 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 Pacific Northwest · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the upper Mississippi valley · 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: Seattle-Tacoma International, Appleton International.