Plan a flight · Sun 7:29 pm CDT (00:29 UTC)

Robert Gray Army Airfield to Boeing Fld/King County International GRK → BFI

1,495 nautical miles (1,720 statute miles) northwest on a straight line, true course 318°, about 314° magnetic at the departure end (variation 4E). At 120 knots that is 12 h 03 min at the quickest height in today's winds (4,500 ft, a 4-knot tailwind), arriving about 5:32 am PDT (12:32 UTC), after sunset at the destination. Right now GRK is VFR, wind from the south-southeast (150°) at 7 knots; BFI is VFR, wind variable 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: 3 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 W68W: thunderstorms (a convective SIGMET) up to 36,000 ft, moving from the southwest at 40 knots, until 8:55 pm CDT (01:55 UTC). Over the route from 478 to 767 nm out.

as issued

WSUS33 KKCI 112355
MKCW WST 112355
CONVECTIVE SIGMET 68W
VALID UNTIL 0155Z
CO NM AZ UT
FROM 30W CHE-20NNW TBE-60SE ABQ-40N SJN-30SW MTU-30W CHE
AREA TS MOV FROM 23040KT. TOPS TO FL360.

SIGMET W71W: thunderstorms (a convective SIGMET) up to 27,000 ft, moving from the south at 40 knots, until 8:55 pm CDT (01:55 UTC). Over the route from 887 to 1007 nm out.

as issued

WSUS33 KKCI 112355
MKCW WST 112355
CONVECTIVE SIGMET 71W
VALID UNTIL 0155Z
WY UT ID
FROM 40S DBS-40WNW BPI-30WSW MTU-30SSW DTA-30SE TWF-40S DBS
AREA EMBD TS MOV FROM 20040KT. TOPS TO FL270.

AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 449 to 967 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 558 to 1216 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 608 to 1326 nm out.
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 route from 628 to 947 nm out.
AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 738 to 767 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 797 to 1136 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 937 to 1126 nm out.
AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 1196 to 1375 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 25,000 ft to 39,000 ft. Over the last 0 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 GRK.

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

urgent PC12 at 13,000 ft, 49 nm southwest, 4:48 pm CDT (21:48 UTC): severe turbulence from 13,000 ft to 14,000 ft, remarks: lots of moderate, moments of severe. 927 nm along the route, 49 nm southwest of the line.
as filed, and in English
```
SLC UUA /OV OGD280010/TM 2148/FL130/TP PC12/TB SEV 140-130/RM LOTS OF MODERATE, MOMENTS OF SEV
```
Report
an urgent report filed through SLC
Where
10 nm west (280°) of OGD
Time
21:48 UTC
Height
at 13,000 ft
Aircraft
PC12
Turbulence
severe from 14,000 ft to 13,000 ft
Remarks
lots of moderate, moments of severe
GLF5 at 10,000 ft, 46 nm southwest, 5:06 pm CDT (22:06 UTC): moderate turbulence. At the departure end, 46 nm southwest of the line.
as filed, and in English
```
TEB UA /OV MUGSY/TM 2206/FL100/TP GLF5/TB MODERATE FROM 100 TO 50
```
Report
a routine report filed through TEB
Where
mugsy
Time
22:06 UTC
Height
at 10,000 ft
Aircraft
GLF5
Turbulence
moderate from 10,000 ft to 50
UAL2238 at 38,000 ft, 25 nm southwest, 6:44 pm CDT (23:44 UTC): moderate turbulence, wind 244° at 64 knots. 608 nm along the route, 25 nm southwest of the line.
as filed, and in English
```
ARP UAL2238 3807N 10649W 2344 F380 244/064KT TB CONT MOD TURB IC
```
Report
a routine report filed through ARP
C680A at 16,000 ft, 23 nm northeast, 5:59 pm CDT (22:59 UTC): moderate turbulence, scattered clouds above 16,000 ft, remarks: during the descent. 658 nm along the route, 23 nm northeast of the line.
as filed, and in English
```
ASE UA /OV HAERI/TM 2259/FL160/TP C680A/SK SCT160/TB CONS MOD/RM DURD
```
Report
a routine report filed through ASE
Where
haeri
Time
22:59 UTC
Height
at 16,000 ft
Aircraft
C680A
Sky
scattered clouds from 16,000 ft
Turbulence
continuous moderate
Remarks
during the descent
C650 at 40,000 ft, 31 nm northeast, 6:48 pm CDT (23:48 UTC): moderate turbulence, remarks: ZDVWC-03. 668 nm along the route, 31 nm northeast of the line.
as filed, and in English
```
ASE UA /OV DBL/TM 2348/FL400/TP C650/TB MOD /RM ZDVWC-03
```
Report
a routine report filed through ASE
Where
over DBL
Time
23:48 UTC
Height
at 40,000 ft
Aircraft
C650
Turbulence
moderate
Remarks
ZDVWC-03
C680 at 18,000 ft, 4 nm east, 5:35 pm CDT (22:35 UTC): moderate turbulence, remarks: from 18,000 ft to 10,000 ft. 668 nm along the route, 4 nm east of the line.
as filed, and in English
```
ASE UA /OV ASE230020/TM 2235/FL180/TP C680/TB MOD/RM 180-100
```
Report
a routine report filed through ASE
Where
20 nm southwest (230°) of ASE
Time
22:35 UTC
Height
at 18,000 ft
Aircraft
C680
Turbulence
moderate
Remarks
from 18,000 ft to 10,000 ft
C700 at 16,000 ft, 43 nm northeast, 4:55 pm CDT (21:55 UTC): moderate turbulence. 668 nm along the route, 43 nm northeast of the line.
as filed, and in English
```
ASE UA /OV WERNR/TM 2155/FL160/TP C700/TB MOD
```
Report
a routine report filed through ASE
Where
wernr
Time
21:55 UTC
Height
at 16,000 ft
Aircraft
C700
Turbulence
moderate
LJ40 at 19,000 ft, 14 nm northeast, 4:32 pm CDT (21:32 UTC): moderate turbulence. 668 nm along the route, 14 nm northeast of the line.
as filed, and in English
```
ASE UA /OV ASE240010/TM 2132/FL190/TP LJ40/TB MOD
```
Report
a routine report filed through ASE
Where
10 nm southwest (240°) of ASE
Time
21:32 UTC
Height
at 19,000 ft
Aircraft
LJ40
Turbulence
moderate
E170 at 10,000 ft, 38 nm southwest, 6:41 pm CDT (23:41 UTC): moderate turbulence up to 10,000 ft, remarks: during the climb. 708 nm along the route, 38 nm southwest of the line.
as filed, and in English
```
GJT UA /OV GJT144009/TM 2341/FL100/TP E170/TB MOD SFC-100/RM DURC
```
Report
a routine report filed through GJT
Where
9 nm southeast (144°) of GJT
Time
23:41 UTC
Height
at 10,000 ft
Aircraft
E170
Turbulence
moderate from the surface to 10,000 ft
Remarks
during the climb
A339 at 16,000 ft, 37 nm southwest, 6:35 pm CDT (23:35 UTC): moderate chop turbulence up to 16,000 ft, remarks: during the climb zlc. 907 nm along the route, 37 nm southwest of the line.
as filed, and in English
```
OGD UA /OV OGD063012/TM 2335/FL160/TP A339/TB MOD CHOP 160 BLO/RM DURC /ZLC
```
Report
a routine report filed through OGD
Where
12 nm northeast (063°) of OGD
Time
23:35 UTC
Height
at 16,000 ft
Aircraft
A339
Turbulence
moderate chop at 16,000 ft below
Remarks
during the climb zlc
E75L at 14,500 ft, 43 nm southwest, 6:05 pm CDT (23:05 UTC): moderate turbulence up to 15,800 ft, heavy rain, remarks: during the climb zlc. 907 nm along the route, 43 nm southwest of the line.
as filed, and in English
```
OGD UA /OV OGD086008/TM 2305/FL145/TP E75L/WX +RA/TB MOD 158 BLO/RM DURC /ZLC
```
Report
a routine report filed through OGD
Where
8 nm east (086°) of OGD
Time
23:05 UTC
Height
at 14,500 ft
Aircraft
E75L
Weather
heavy rain
Turbulence
moderate at 15,800 ft below
Remarks
during the climb zlc
E75L at 12,500 ft, 46 nm southwest, 5:25 pm CDT (22:25 UTC): moderate turbulence. 907 nm along the route, 46 nm southwest of the line.
as filed, and in English
```
HIF UA /OV HIF103005/TM 2225/FL125/TP E75L/TB MOD /ZLC
```
Report
a routine report filed through HIF
Where
5 nm east (103°) of HIF
Time
22:25 UTC
Height
at 12,500 ft
Aircraft
E75L
Turbulence
moderate zlc
GLEX at 47,000 ft, 15 nm southwest, 4:38 pm CDT (21:38 UTC): remarks: mountain wave a 10-knot loss of airspeed or 150FT zab fdcs. 449 nm along the route, 15 nm southwest of the line.
as filed, and in English
```
RTN UA /OV CIM090030/TM 2138/FL470/TP GLEX/RM MTN WAVE +/-10KTS OR 150FT ZAB FDCS
```
Report
a routine report filed through RTN
Where
30 nm east (090°) of CIM
Time
21:38 UTC
Height
at 47,000 ft
Aircraft
GLEX
Remarks
mountain wave a 10-knot loss of airspeed or 150FT zab fdcs
E145 at 7,400 ft, 23 nm southwest, 7:15 pm CDT (00:15 UTC): remarks: base reported below minimums 1/2 miles visibility ZDVWC-41. 548 nm along the route, 23 nm southwest of the line.
as filed, and in English
```
ALS UA /OV KALS/TM 0015/FL074/TP E145/RM BASE REPORTED BELOW MINIMUMS 1/2 SM VIS ZDVWC-41
```
Report
a routine report filed through ALS
Where
over KALS
Time
00:15 UTC
Height
at 7,400 ft
Aircraft
E145
Remarks
base reported below minimums 1/2 miles visibility ZDVWC-41

16 more routine reports are on the map.

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 13 forecast points nearest it (ABI, LBB, AMA, TCC, ALS, GJT, RKS, SLC, 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	200° at 7 kt	−4 kt	14 °C	124 kt	12 h 03 min	5:32 am PDT (12:32 UTC)
6,500 ft	200° at 7 kt	−3 kt	7 °C	123 kt	12 h 09 min	5:38 am PDT (12:38 UTC)
8,500 ft	210° at 13 kt	−3 kt	5 °C	123 kt	12 h 09 min	5:38 am PDT (12:38 UTC)
10,500 ft	210° at 19 kt	−4 kt	3 °C	124 kt	12 h 03 min	5:32 am PDT (12:32 UTC)
12,500 ft	220° at 23 kt	−4 kt	-1 °C	124 kt	12 h 03 min	5:32 am PDT (12:32 UTC)
14,500 ft	220° at 26 kt	−4 kt	-4 °C	124 kt	12 h 03 min	5:32 am PDT (12:32 UTC)
16,500 ft	220° at 29 kt	−3 kt	-9 °C	123 kt	12 h 09 min	5:38 am PDT (12:38 UTC)
18,000 ft FL180	220° at 31 kt	−3 kt	-12 °C	123 kt	12 h 09 min	5:38 am PDT (12:38 UTC)
24,000 ft FL240	220° at 34 kt	−1 kt	-21 °C	121 kt	12 h 21 min	5:50 am PDT (12:50 UTC)
30,000 ft FL300	230° at 44 kt	+3 kt	-31 °C	117 kt	12 h 47 min	6:16 am PDT (13:16 UTC)
34,000 ft FL340	240° at 48 kt	+13 kt	-37 °C	107 kt	13 h 58 min	7:27 am PDT (14:27 UTC)
39,000 ft FL390	240° at 48 kt	+17 kt	-46 °C	103 kt	14 h 31 min	8:00 am PDT (15:00 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
ABI	used from 0 nm out; 100 nm from the line		180/26 17°	220/18 12°	230/25 8°	230/28 -5°	240/29 -14°	250/35 -28°	270/37 -39°	280/37 -51°
LBB	used from 199 nm out; 51 nm from the line		180/26 20°	210/21 13°	230/21 7°	250/25 -5°	250/34 -16°	250/52 -28°	260/47 -38°	260/49 -50°
AMA	used from 299 nm out; 27 nm from the line		190/28	220/26 14°	230/27 7°	250/24 -6°	250/32 -16°	240/51 -28°	250/52 -38°	250/51 -50°
TCC	used from 349 nm out; 43 nm from the line		200/26	200/28 14°	220/25 7°	230/28 -7°	240/41 -19°	240/62 -28°	250/61 -37°	250/49 -49°
ALS	used from 449 nm out; 81 nm from the line				210/32 5°	230/48 -8°	230/49 -20°	230/78 -30°	240/74 -36°	240/61 -47°
GJT	used from 648 nm out; 52 nm from the line			210/40 11°	210/46 3°	210/61 -10°	210/68 -22°	220/57 -29°	230/59 -36°	240/66 -46°
RKS	used from 797 nm out; 60 nm from the line			190/43	210/65 3°	210/57 -9°	210/56 -21°	210/47 -33°	230/63 -37°	240/77 -46°
SLC	used from 847 nm out; 68 nm from the line		280/8	210/39 5°	210/52 -1°	200/50 -11°	200/56 -23°	220/61 -28°	230/73 -37°	230/73 -45°
PIH	used from 947 nm out; 34 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 1096 nm out; 57 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 1196 nm out; 86 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 1346 nm out; 34 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 1445 nm out; 23 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
GRK Fort Hood (Killeen), TX	departure	VFR	from the south-southeast (150°) at 7 knots	10+ mi	none	1,015 ft	6:55 pm CDT (23:55 UTC)
ABI Abilene, TX	120 nm out, 16 nm southwest of the line, tower	VFR	from the south-southeast (160°) at 16 knots, gusting to 25	10+ mi	none	1,790 ft	23:52 UTC
PVW Plainview, TX	269 nm out, 18 nm southwest of the line	VFR	from the south (170°) at 13 knots	10+ mi	none	3,374 ft	00:15 UTC
HRX Hereford, TX	319 nm out, 11 nm southwest of the line	reported, no category	from the south-southwest (200°) at 12 knots	10+ mi	none	3,787 ft	00:10 UTC
RTN Raton, NM	478 nm out, 7 nm southwest of the line	VFR Sky: a broken layer at 11,000 feet	from the south-southwest (210°) at 23 knots, gusting to 32	10+ mi	11,000 ft	6,352 ft	23:53 UTC
ASE Aspen, CO	658 nm out, 23 nm northeast of the line, tower	VFR Sky: a few clouds at 9,500 feet	from the north-northwest (330°) at 3 knots	10+ mi	none	7,837 ft	23:53 UTC
VEL Vernal, UT	797 nm out, 6 nm southwest of the line	VFR Sky: scattered clouds at 9,000 feet	variable at 3 knots	10+ mi	none	5,274 ft	23:53 UTC
PIH Pocatello, ID	997 nm out, 18 nm northeast of the line, tower	IFR Sky: a broken layer at 700 feet, overcast at 1,300 feet Weather: light rain	from the southwest (230°) at 15 knots	7 mi	700 ft	4,451 ft	23:53 UTC
SUN Hailey, ID	1076 nm out, 5 nm west of the line, tower	marginal VFR Sky: scattered clouds at 300 feet, a broken layer at 1,300 feet, overcast at 2,200 feet Weather: light rain	from the east-southeast (120°) at 5 knots	7 mi	1,300 ft	5,319 ft	23:47 UTC
PDT Pendleton, OR	1316 nm out, 12 nm southwest of the line, tower	VFR Sky: overcast at 6,000 feet	from the north (360°) at 7 knots	10+ mi	6,000 ft	1,494 ft	23:53 UTC
PSC Pasco, WA	1346 nm out, 9 nm northeast of the line, tower	VFR Sky: a few clouds at 7,000 feet	from the northeast (040°) at 11 knots	10+ mi	none	410 ft	23:53 UTC
BFI Seattle, WA	destination	VFR	variable at 6 knots	10+ mi	none	21 ft	4:53 pm PDT (23:53 UTC)

The highest airport on this list sits at 7,837 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BFI when you get there the forecast at the estimated arrival, 5:32 am PDT (12:32 UTC)

Wind light and variable, visibility more than 6 miles, patches of fog, clear skies VFR

The whole forecast for BFI

From Sun 5:00 pm PDT (00:00 UTC): wind from the north-northwest at 8 knots, gusting to 18, visibility more than 6 miles, a few clouds at 5,000 feet
From Sun 7:00 pm PDT (02:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind light and variable, 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 3 knots, 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

The forecast for GRK, the departure

From Sun 7:00 pm CDT (00:00 UTC): wind from the south-southeast at 9 knots, scattered clouds at 6,000 feet
Changing between Mon 3:00 am CDT (08:00 UTC) and 4:00 am CDT (09:00 UTC) to: wind from the southeast at 6 knots, a broken layer at 1,500 feet
Changing between Mon 4:00 pm CDT (21:00 UTC) and 5:00 pm CDT (22:00 UTC) to: wind from the south-southeast at 12 knots, a broken layer at 5,000 feet
Changing between Mon 10:00 pm CDT (03:00 UTC) and 11:00 pm CDT (04:00 UTC) to: wind from the south-southeast at 9 knots, a broken layer at 1,500 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 GRK 7:03 pm CDT (00:03 UTC), at BFI 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 UTC)). At 120 knots the arrival at BFI 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 Plains · loop National Weather Service

Radar now, the southern 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: Robert Gray Army Airfield, Boeing Fld/King County International.