Plan a flight · Mon 2:06 am PDT (09:06 UTC)

Boeing Fld/King County International to Gerald R Ford International BFI → GRR

1,566 nautical miles (1,802 statute miles) east on a straight line, true course 087°, about 072° magnetic at the departure end (variation 15E). At 120 knots that is 9 h 36 min at the quickest height in today's winds (39,000 ft, a 43-knot tailwind), arriving about 2:42 pm EDT (18:42 UTC). Right now BFI is VFR, wind calm; GRR is marginal VFR, wind from the south-southeast (160°) at 5 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

SIGMET C15C: thunderstorms (a convective SIGMET) up to 35,000 ft, moving from the southwest at 40 knots, until 3:55 am PDT (10:55 UTC). Near the route, 838 nm along the route.
as issued
```
WSUS32 KKCI 120855
MKCC WST 120855
CONVECTIVE SIGMET 15C
VALID UNTIL 1055Z
SD ND
FROM 50SE DIK-50ENE DPR-40ENE RAP-50NNW RAP-50SE DIK
AREA TS MOV FROM 22040KT. TOPS TO FL350.
```
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 179 to 698 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 259 to 1127 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 ZULU 2C: moderate icing up to 23,000 ft. Over the route from 708 to 758 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 route from 1256 to 1436 nm out.
AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist, fog). Near the route, at the destination end.

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 BFI.

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

BE20 at 15,000 ft, 12 nm north, 1:00 am PDT (08:00 UTC): light icing, 0 °C. 798 nm along the route, 12 nm north 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
B77W at 30,000 ft, 33 nm south, 1:00 am PDT (08:00 UTC): light to moderate chop turbulence. 997 nm along the route, 33 nm south of the line.
as filed, and in English
```
ABR UA /OV ABR/TM 0800/FL300/TP B77W/TB LGT-MOD CHOP
```
Report
a routine report filed through ABR
Where
over ABR
Time
08:00 UTC
Height
at 30,000 ft
Aircraft
B77W
Turbulence
light to moderate chop

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 14 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, MLS, DIK, ABR, AXN, MSP, LSE, GRB, MKG). 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	250° at 6 kt	−5 kt	-1 °C	125 kt	12 h 32 min	5:38 pm EDT (21:38 UTC)
7,500 ft	240° at 9 kt	−6 kt	6 °C	126 kt	12 h 26 min	5:32 pm EDT (21:32 UTC)
9,500 ft	240° at 12 kt	−7 kt	2 °C	127 kt	12 h 20 min	5:26 pm EDT (21:26 UTC)
11,500 ft	240° at 13 kt	−9 kt	0 °C	129 kt	12 h 08 min	5:14 pm EDT (21:14 UTC)
13,500 ft	240° at 14 kt	−11 kt	-4 °C	131 kt	11 h 57 min	5:03 pm EDT (21:03 UTC)
15,500 ft	250° at 16 kt	−12 kt	-8 °C	132 kt	11 h 52 min	4:58 pm EDT (20:58 UTC)
17,500 ft	250° at 17 kt	−13 kt	-12 °C	133 kt	11 h 46 min	4:52 pm EDT (20:52 UTC)
18,000 ft FL180	250° at 17 kt	−14 kt	-13 °C	134 kt	11 h 41 min	4:47 pm EDT (20:47 UTC)
24,000 ft FL240	250° at 23 kt	−19 kt	-25 °C	139 kt	11 h 16 min	4:22 pm EDT (20:22 UTC)
30,000 ft FL300	250° at 27 kt	−21 kt	-37 °C	141 kt	11 h 06 min	4:12 pm EDT (20:12 UTC)
34,000 ft FL340	250° at 37 kt	−31 kt	-41 °C	151 kt	10 h 22 min	3:28 pm EDT (19:28 UTC)
39,000 ft FL390	250° at 47 kt	−43 kt	-46 °C	163 kt	9 h 36 min	2:42 pm EDT (18:42 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; 26 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; 61 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; 68 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; 67 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; 19 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; 86 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 598 nm out; 61 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 748 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; 75 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 1047 nm out; 43 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 1147 nm out; 40 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 1246 nm out; 52 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 1396 nm out; 47 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°
MKG	used from 1446 nm out; 59 nm from the line	260/28	260/18 15°	250/16 9°	260/22 4°	280/31 -9°	270/35 -21°	270/44 -35°	270/42 -45°	290/61 -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
BFI Seattle, WA	departure	VFR	calm	10+ mi	none	21 ft	1:53 am PDT (08:53 UTC)
MWH Moses Lake, WA	120 nm out, 24 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, 4 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
GTF Great Falls, MT	439 nm out, 5 nm east 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
JDN Jordan, MT	618 nm out, 13 nm northeast of the line	reported, no category	from the north (360°) at 9 knots		none	2,667 ft	08:48 UTC
GDV Glendive, MT	708 nm out, 14 nm north 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
BIS Bismarck, ND	877 nm out, 24 nm north 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
MOX Morris, MN	1087 nm out, 2 nm northeast of the line	low IFR Sky: overcast at 200 feet Weather: mist	from the northwest (320°) at 7 knots	0.75 mi	200 ft	1,135 ft	08:40 UTC
STP St Paul, MN	1217 nm out, 1 nm northeast of the line, tower	VFR	calm	10+ mi	none	705 ft	08:53 UTC
EAU Eau Claire, WI	1286 nm out, 19 nm north of the line, tower	VFR	from the south-southwest (200°) at 3 knots	10+ mi	none	913 ft	08:56 UTC
MKG Muskegon, MI	1526 nm out, 6 nm east of the line, tower	reported, no category	from the south (180°) at 6 knots	10+ mi	none	628 ft	08:55 UTC
GRR Grand Rapids, MI	destination	marginal VFR Weather: mist	from the south-southeast (160°) at 5 knots	5 mi	none	793 ft	4:53 am EDT (08:53 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 GRR when you get there the forecast at the estimated arrival, 2:42 pm EDT (18:42 UTC)

Wind from the southwest at 12 knots, gusting to 20, visibility more than 6 miles, a broken layer at 20,000 feet VFR

The whole forecast for GRR

From Mon 2:00 am EDT (06:00 UTC): wind from the south at 3 knots, visibility 4 miles, mist, scattered clouds at 25,000 feet
At times between Mon 2:00 am EDT (06:00 UTC) and 4:00 am EDT (08:00 UTC): visibility ½ mile, fog
From Mon 5:00 am EDT (09:00 UTC): wind from the south at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 1:00 pm EDT (17:00 UTC): wind from the southwest at 12 knots, gusting to 20, visibility more than 6 miles, a broken layer at 20,000 feet
From Mon 6:00 pm EDT (22:00 UTC): wind from the south-southwest at 10 knots, visibility more than 6 miles, scattered clouds at 8,000 feet
From Mon 10:00 pm EDT (02:00 UTC): wind from the south at 8 knots, visibility 4 miles, light rain showers, mist, scattered clouds at 5,000 feet, overcast at 8,000 feet
30% chance between Mon 10:00 pm EDT (02:00 UTC) and 2:00 am EDT (06:00 UTC): visibility 2 miles, light thunderstorms with rain, mist, overcast at 3,500 feet (thunderheads)

The forecast for BFI, the departure

From Mon 2:00 am PDT (09:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 3 knots, visibility more than 6 miles, clear skies
From Mon 2:00 pm PDT (21:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, clear skies
From Mon 7:00 pm PDT (02:00 UTC): wind calm, visibility more than 6 miles, clear skies

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 12 nm from the route, 1197 nm along the route · security · until 19 October · ZMP

Daylight

Sunset at BFI 6:25 pm PDT (01:25 UTC), at GRR 7:04 pm EDT (23:04 UTC) (civil twilight ends 7:33 pm EDT (23:33 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: Boeing Fld/King County International, Gerald R Ford International.