Plan a flight · Sun 5:20 pm PDT (00:20 UTC)

Seattle-Tacoma International to Green Bay/Austin Straubel International SEA → GRB

1,426 nautical miles (1,641 statute miles) east on a straight line, true course 084°, about 068° magnetic at the departure end (variation 16E). At 120 knots that is 8 h 17 min at the quickest height in today's winds (39,000 ft, a 52-knot tailwind), arriving about 3:37 am CDT (08:37 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north-northwest (340°) at 10 knots; GRB is VFR, wind from the south (170°) 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: 2 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 ZULU 2C: moderate icing up to 14,000 ft. Over the route from 120 to 359 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 209 to 528 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 269 to 768 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 339 to 808 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 SEA.

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

B739 at 3,700 ft, 48 nm south, 2:58 pm PDT (21:58 UTC): overcast above 3,700 ft, remarks: during the descent ils runway 12. 329 nm along the route, 48 nm south of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 2158/FL037/TP B739/SK OVC037/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
21:58 UTC
Height
at 3,700 ft
Aircraft
B739
Sky
overcast from 3,700 ft
Remarks
during the descent ils runway 12
B38M at 32,000 ft, 40 nm north, 4:12 pm PDT (23:12 UTC): light chop turbulence. 798 nm along the route, 40 nm north of the line.
as filed, and in English
```
MOT UA /OV MOT225061/TM 2312/FL320/TP B38M/TB CONS LGT CHOP
```
Report
a routine report filed through MOT
Where
61 nm southwest (225°) of MOT
Time
23:12 UTC
Height
at 32,000 ft
Aircraft
B38M
Turbulence
continuous light chop
BE20 at 3,000 ft, 12 nm south, 3:56 pm PDT (22:56 UTC): no turbulence, no icing. 798 nm along the route, 12 nm south of the line.
as filed, and in English
```
DIK UA /OV DIK/TM 2256/FL030/TP BE20/SK BASE031/TB NEG/IC NEG
```
Report
a routine report filed through DIK
Where
over DIK
Time
22:56 UTC
Height
at 3,000 ft
Aircraft
BE20
Sky
BASE031
Turbulence
none
Icing
none
TBM7 at 3,000 ft, 12 nm south, 2:55 pm PDT (21:55 UTC): no turbulence, no icing, 5 °C. 798 nm along the route, 12 nm south of the line.
as filed, and in English
```
DIK UA /OV DIK/TM 2155/FL030/TP TBM7/SK BASE030-TOP043/ BASE060-TOP081/TA 05/TB NEG/IC NEG
```
Report
a routine report filed through DIK
Where
over DIK
Time
21:55 UTC
Height
at 3,000 ft
Aircraft
TBM7
Sky
BASE030-TOP043; BASE060-TOP081
Temperature
5 °C
Turbulence
none
Icing
none
C56X at 1,300 ft, 38 nm north, 4:17 pm PDT (23:17 UTC): overcast above 1,300 ft. 1037 nm along the route, 38 nm north of the line.
as filed, and in English
```
FAR UA /OV KFAR/TM 2317/FL013/TP C56X/SK OVC013
```
Report
a routine report filed through FAR
Where
over KFAR
Time
23:17 UTC
Height
at 1,300 ft
Aircraft
C56X
Sky
overcast from 1,300 ft
E170 at 6,000 ft, 28 nm north, 3:18 pm PDT (22:18 UTC): remarks: during the descent runway 36. 1037 nm along the route, 28 nm north of the line.
as filed, and in English
```
FAR UA /OV FAR/TM 2218/FL060/TP E170/SK TOP060-OVC014/RM DURD RWY 36
```
Report
a routine report filed through FAR
Where
over FAR
Time
22:18 UTC
Height
at 6,000 ft
Aircraft
E170
Sky
TOP060-OVC014
Remarks
during the descent runway 36
E170 descending, 38 nm north, 2:37 pm PDT (21:37 UTC): remarks: during the descent runway 36. 1037 nm along the route, 38 nm north of the line.
as filed, and in English
```
FAR UA /OV KFAR/TM 2137/FLUNKN/TP E170/SK TOP030-OVC016/RM DURD RWY 36
```
Report
a routine report filed through FAR
Where
over KFAR
Time
21:37 UTC
Height
height not given
Aircraft
E170
Sky
TOP030-OVC016
Remarks
during the descent runway 36
CRJ7 at 18,000 ft, 32 nm north, 4:41 pm PDT (23:41 UTC): light rime icing from 18,000 ft to 20,000 ft, -13 °C, remarks: during the descent. 1087 nm along the route, 32 nm north of the line.
as filed, and in English
```
FAR UA /OV FAR090050/TM 2341/FL180/TP CRJ7/SK BASE180-TOP200/TA M13/IC LGT RIME 180-200/RM DURD
```
Report
a routine report filed through FAR
Where
50 nm east (090°) of FAR
Time
23:41 UTC
Height
at 18,000 ft
Aircraft
CRJ7
Sky
BASE180-TOP200
Temperature
−13 °C
Icing
light rime from 18,000 ft to 20,000 ft
Remarks
during the descent

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 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	100° at 4 kt	+5 kt	1 °C	115 kt	12 h 24 min	7:44 am CDT (12:44 UTC)
7,500 ft	160° at 3 kt	+2 kt	5 °C	118 kt	12 h 05 min	7:25 am CDT (12:25 UTC)
9,500 ft	210° at 6 kt	−1 kt	2 °C	121 kt	11 h 47 min	7:07 am CDT (12:07 UTC)
11,500 ft	220° at 10 kt	−5 kt	-1 °C	125 kt	11 h 24 min	6:44 am CDT (11:44 UTC)
13,500 ft	230° at 14 kt	−9 kt	-5 °C	129 kt	11 h 03 min	6:23 am CDT (11:23 UTC)
15,500 ft	230° at 18 kt	−12 kt	-9 °C	132 kt	10 h 48 min	6:08 am CDT (11:08 UTC)
17,500 ft	230° at 22 kt	−15 kt	-13 °C	135 kt	10 h 34 min	5:54 am CDT (10:54 UTC)
18,000 ft FL180	230° at 22 kt	−16 kt	-14 °C	136 kt	10 h 29 min	5:49 am CDT (10:49 UTC)
24,000 ft FL240	240° at 30 kt	−24 kt	-23 °C	144 kt	9 h 54 min	5:14 am CDT (10:14 UTC)
30,000 ft FL300	240° at 41 kt	−33 kt	-36 °C	153 kt	9 h 19 min	4:39 am CDT (09:39 UTC)
34,000 ft FL340	250° at 46 kt	−42 kt	-44 °C	162 kt	8 h 48 min	4:08 am CDT (09:08 UTC)
39,000 ft FL390	260° at 54 kt	−52 kt	-48 °C	172 kt	8 h 17 min	3:37 am CDT (08:37 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
SEA	used from 0 nm out; 25 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°
YKM	used from 50 nm out; 59 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°
GEG	used from 100 nm out; 69 nm from the line		050/18 -2°	060/19 -8°	L/V -11°	160/11 -24°	190/17 -31°	200/19 -35°	220/14 -37°	250/11 -41°
GPI	used from 249 nm out; 64 nm from the line		060/19 -3°	110/11 -8°	130/6 -8°	200/40 -19°	190/58 -28°	200/101 -39°	220/73 -43°	230/41 -43°
GTF	used from 399 nm out; 22 nm from the line		070/21	080/18 -6°	120/5 -5°	180/30 -14°	200/53 -24°	210/80 -38°	220/83 -44°	230/68 -46°
GGW	used from 548 nm out; 75 nm from the line		090/18 0°	140/12 -2°	150/13 -3°	200/35 -12°	230/56 -22°	240/75 -37°	240/81 -46°	240/78 -49°
MLS	used from 648 nm out; 55 nm from the line		120/22 5°	170/18 4°	200/33 1°	230/49 -10°	230/58 -21°	220/54 -37°	230/64 -44°	250/74 -49°
DIK	used from 698 nm out; 74 nm from the line		110/15 6°	200/17 5°	230/31 1°	240/47 -10°	240/52 -20°	230/52 -36°	240/57 -45°	250/67 -51°
ABR	used from 897 nm out; 92 nm from the line	030/24	220/5 16°	230/18 12°	230/32 5°	240/38 -10°	250/37 -20°	240/40 -35°	240/56 -44°	250/72 -52°
AXN	used from 1047 nm out; 37 nm from the line	L/V	220/23 17°	230/24 12°	240/25 5°	260/32 -11°	260/40 -21°	270/50 -35°	270/57 -45°	270/81 -55°
MSP	used from 1147 nm out; 59 nm from the line	200/28	240/30 19°	240/24 12°	240/17 5°	270/24 -10°	270/33 -20°	280/48 -35°	290/55 -45°	280/84 -54°
LSE	used from 1296 nm out; 78 nm from the line	220/33	250/29 17°	250/15 9°	260/12 6°	280/21 -9°	280/33 -20°	300/43 -36°	310/56 -45°	300/79 -53°
GRB	used from 1346 nm out; 55 nm from the line	240/24	260/18 16°	270/20 11°	290/14 4°	280/24 -9°	300/34 -21°	310/51 -38°	310/54 -48°	300/71 -51°

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 Sky: a few clouds at 2,000 feet, a few clouds at 5,000 feet	from the north-northwest (340°) at 10 knots	10+ mi	none	432 ft	4:53 pm PDT (23:53 UTC)
MWH Moses Lake, WA	120 nm out, 24 nm south of the line, tower	VFR Sky: a broken layer at 10,000 feet	from the east-northeast (070°) at 14 knots	10+ mi	10,000 ft	1,188 ft	23:52 UTC
SFF Spokane, WA	199 nm out, 3 nm east of the line, tower	VFR Sky: a broken layer at 6,500 feet, a broken layer at 8,000 feet, overcast at 11,000 feet	from the east-northeast (060°) at 15 knots, gusting to 20	10+ mi	6,500 ft	1,956 ft	23:53 UTC
THM Thompson Falls, MT	289 nm out, 8 nm southwest of the line	no report just now				2,467 ft
GTF Great Falls, MT	439 nm out, 11 nm southeast of the line, tower	low IFR Sky: a broken layer at 400 feet, overcast at 900 feet Weather: light snow, mist	from the north-northeast (030°) at 11 knots	0.75 mi	400 ft	3,680 ft	23:53 UTC
GDV Glendive, MT	708 nm out, 8 nm south of the line	IFR Sky: overcast at 600 feet Weather: light rain, mist	from the northeast (050°) at 17 knots, gusting to 23	4 mi	600 ft	2,458 ft	23:56 UTC
DIK Dickinson, ND	798 nm out, 16 nm south of the line	IFR Sky: overcast at 500 feet Weather: light rain	from the northeast (050°) at 17 knots, gusting to 24	8 mi	500 ft	2,592 ft	23:56 UTC
BIS Bismarck, ND	877 nm out, 4 nm south of the line, tower	marginal VFR Sky: overcast at 1,400 feet	from the north-northeast (020°) at 14 knots, gusting to 25	10+ mi	1,400 ft	1,661 ft	23:52 UTC
BWP Wahpeton, ND	1057 nm out, 4 nm west of the line	VFR	from the north (360°) at 16 knots, gusting to 23	10+ mi	none	968 ft	23:35 UTC
STC St Cloud, MN	1167 nm out, 14 nm south of the line, tower	VFR	from the northeast (050°) at 5 knots	10+ mi	none	1,030 ft	23:53 UTC
CWA Mosinee, WI	1356 nm out, 5 nm south of the line, tower	VFR	from the south (180°) at 5 knots	10+ mi	none	1,277 ft	23:50 UTC
GRB Green Bay, WI	destination	VFR	from the south (170°) at 6 knots	10+ mi	none	695 ft	6:53 pm CDT (23:53 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 GRB when you get there the forecast at the estimated arrival, 3:37 am CDT (08:37 UTC)

Wind from the south-southwest at 6 knots, visibility more than 6 miles, low-level wind shear, scattered clouds at 20,000 feet VFR

The whole forecast for GRB

From Sun 7:00 pm CDT (00:00 UTC): wind from the south at 7 knots, visibility more than 6 miles, clear skies
From Sun 9:00 pm CDT (02:00 UTC): wind from the south at 7 knots, visibility more than 6 miles, low-level wind shear, clear skies
From Mon 12:00 am CDT (05:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, low-level wind shear, scattered clouds at 20,000 feet
From Mon 8:00 am CDT (13:00 UTC): wind from the south-southwest at 7 knots, visibility more than 6 miles, a broken layer at 25,000 feet
From Mon 1:00 pm CDT (18:00 UTC): wind from the southwest at 6 knots, visibility more than 6 miles, scattered clouds at 4,500 feet

The forecast for SEA, the departure

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

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 SEA 6:27 pm PDT (01:27 UTC), at GRB 6:13 pm CDT (23:13 UTC) (civil twilight ends 6:42 pm CDT (23:42 UTC)). At 120 knots the arrival at GRB is before sunrise there (7:03 am CDT (12:03 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, Green Bay/Austin Straubel International.