Plan a flight · Mon 12:08 am PDT (07:08 UTC)

Boeing Fld/King County International to Valley International BFI → HRL

1,728 nautical miles (1,988 statute miles) southeast on a straight line, true course 129°, about 114° magnetic at the departure end (variation 15E). At 120 knots that is 13 h 36 min at the quickest height in today's winds (34,000 ft, a 7-knot tailwind), arriving about 3:44 pm CDT (20:44 UTC). Right now BFI is VFR, wind from the south-southeast (160°) at 4 knots; HRL is VFR, wind from the southeast (130°) 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

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 220 nm of the route.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 130 to 270 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 190 to 859 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 310 to 459 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 360 to 759 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 599 to 1119 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Over the route from 639 to 859 nm out.
AIRMET TANGO 2W: moderate turbulence above 18,000 ft from 35,000 ft to 45,000 ft. Over the route from 869 to 1059 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 BFI.

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

PC12 at 14,000 ft, 38 nm northeast, 11:06 pm PDT (06:06 UTC): moderate turbulence, remarks: zab fdcs. 1129 nm along the route, 38 nm northeast of the line.
as filed, and in English
```
CVN UA /OV TXO260060/TM 0606/FL140/TP PC12/TB MOD/RM ZAB FDCS
```
Report
a routine report filed through CVN
Where
60 nm west (260°) of TXO
Time
06:06 UTC
Height
at 14,000 ft
Aircraft
PC12
Turbulence
moderate
Remarks
zab fdcs
E75L at 1,500 ft, 26 nm northeast, 9:49 pm PDT (04:49 UTC): remarks: low-level wind shear loss of 8 knots on final. 150 nm along the route, 26 nm northeast of the line.
as filed, and in English
```
PSC UA /OV PSC120003/TM 0449/FL015/TP E75L/RM LLWS LOSS OF 8 KTS ON FINAL
```
Report
a routine report filed through PSC
Where
3 nm southeast (120°) of PSC
Time
04:49 UTC
Height
at 1,500 ft
Aircraft
E75L
Remarks
low-level wind shear loss of 8 knots on final
E75L descending, 6 nm north, 9:35 pm PDT (04:35 UTC): light turbulence from 11,000 ft to 14,000 ft, light rime icing from 8,000 ft to 12,000 ft, -10 °C. 180 nm along the route, 6 nm north of the line.
as filed, and in English
```
GEG UA /OV PDT/TM 0435/FLDURD/TP E75L/TA M10/TB LT TURB 140-110/IC LT RIME 120-080
```
Report
a routine report filed through GEG
Where
over PDT
Time
04:35 UTC
Height
during the descent
Aircraft
E75L
Temperature
−10 °C
Turbulence
lt turbulence from 14,000 ft to 11,000 ft
Icing
lt rime from 12,000 ft to 8,000 ft
E175 at 6,300 ft, 45 nm northeast, 9:20 pm PDT (04:20 UTC): overcast above 6,300 ft, remarks: during the descent runway 31. 409 nm along the route, 45 nm northeast of the line.
as filed, and in English
```
SUN UA /OV KSUN/TM 0420/FL063/TP E175/SK OVC063-TOPUNKN/RM DURD RY31
```
Report
a routine report filed through SUN
Where
over KSUN
Time
04:20 UTC
Height
at 6,300 ft
Aircraft
E175
Sky
overcast from 6,300 ft, tops unknown
Remarks
during the descent runway 31
A321 at 31,000 ft, 42 nm southwest, 11:15 pm PDT (06:15 UTC): light to moderate chop turbulence, remarks: mountain wave zlc. 729 nm along the route, 42 nm southwest of the line.
as filed, and in English
```
CNY UA /OV HVE340015/TM 0615/FL310/TP A321/TB OCNL LGT-MOD CHOP /RM MTN WAVE /ZLC
```
Report
a routine report filed through CNY
Where
15 nm north (340°) of HVE
Time
06:15 UTC
Height
at 31,000 ft
Aircraft
A321
Turbulence
occasional light to moderate chop
Remarks
mountain wave zlc
PC12 at 11,000 ft, 5 nm north, 11:58 pm PDT (06:58 UTC): light turbulence, no icing, remarks: during the descent arrival KFMN ZDVWC-36. 899 nm along the route, 5 nm north of the line.
as filed, and in English
```
DRO UA /OV DRO/TM 0658/FL110/TP PC12/SK BASE117/TB CONS LGT/IC NEG/RM DURD ARR KFMN. ZDVWC-36
```
Report
a routine report filed through DRO
Where
over DRO
Time
06:58 UTC
Height
at 11,000 ft
Aircraft
PC12
Sky
BASE117
Turbulence
continuous light
Icing
none
Remarks
during the descent arrival KFMN ZDVWC-36

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 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 15 forecast points nearest it (SEA, YKM, LWS, BOI, PIH, SLC, GJT, FMN, ABQ, ROW, INK, DRT, LRD, CRP, BRO). 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	180° at 11 kt	+9 kt	10 °C	111 kt	15 h 34 min	5:42 pm CDT (22:42 UTC)
7,500 ft	200° at 14 kt	+6 kt	8 °C	114 kt	15 h 09 min	5:17 pm CDT (22:17 UTC)
9,500 ft	210° at 13 kt	+4 kt	5 °C	116 kt	14 h 54 min	5:02 pm CDT (22:02 UTC)
11,500 ft	220° at 16 kt	+3 kt	2 °C	117 kt	14 h 46 min	4:54 pm CDT (21:54 UTC)
13,500 ft	220° at 19 kt	+3 kt	-2 °C	117 kt	14 h 46 min	4:54 pm CDT (21:54 UTC)
15,500 ft	220° at 22 kt	+3 kt	-6 °C	117 kt	14 h 46 min	4:54 pm CDT (21:54 UTC)
17,500 ft	220° at 26 kt	+4 kt	-10 °C	116 kt	14 h 54 min	5:02 pm CDT (22:02 UTC)
18,000 ft FL180	220° at 26 kt	+4 kt	-11 °C	116 kt	14 h 54 min	5:02 pm CDT (22:02 UTC)
24,000 ft FL240	220° at 32 kt	+4 kt	-21 °C	116 kt	14 h 54 min	5:02 pm CDT (22:02 UTC)
30,000 ft FL300	230° at 37 kt	−1 kt	-30 °C	121 kt	14 h 17 min	4:25 pm CDT (21:25 UTC)
34,000 ft FL340	240° at 39 kt	−7 kt	-36 °C	127 kt	13 h 36 min	3:44 pm CDT (20:44 UTC)
39,000 ft FL390	240° at 35 kt	−7 kt	-45 °C	127 kt	13 h 36 min	3:44 pm CDT (20:44 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
SEA	used from 0 nm out; 23 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°
YKM	used from 50 nm out; 17 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°
LWS	used from 200 nm out; 91 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°
BOI	used from 250 nm out; 75 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°
PIH	used from 449 nm out; 74 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°
SLC	used from 499 nm out; 76 nm from the line		200/5	230/8 2°	220/20 -2°	210/40 -12°	190/53 -25°	210/62 -30°	220/69 -34°	220/64 -43°
GJT	used from 699 nm out; 78 nm from the line			210/43 7°	230/45 1°	220/49 -12°	220/62 -22°	220/59 -28°	230/60 -33°	220/55 -45°
FMN	used from 849 nm out; 39 nm from the line			220/28 9°	220/40 2°	220/53 -10°	220/62 -22°	230/79 -28°	240/91 -34°	230/71 -45°
ABQ	used from 949 nm out; 65 nm from the line			220/27 11°	210/35 5°	220/46 -9°	230/62 -20°	240/78 -25°	240/80 -35°	240/56 -47°
ROW	used from 1099 nm out; 56 nm from the line		190/33	210/27 14°	220/28 6°	230/36 -6°	230/56 -15°	230/63 -27°	250/59 -37°	260/57 -49°
INK	used from 1248 nm out; 34 nm from the line		190/23 20°	200/18 15°	230/18 8°	240/23 -4°	240/37 -14°	240/46 -27°	250/42 -38°	260/36 -50°
DRT	used from 1398 nm out; 56 nm from the line	160/31	170/28 16°	200/14 16°	210/15 9°	210/15 -4°	240/12 -12°	240/18 -28°	300/11 -38°	320/18 -50°
LRD	used from 1548 nm out; 46 nm from the line	150/27	170/24 17°	170/20 14°	180/12 10°	230/19 -4°	160/10 -14°	130/10 -28°	110/7 -39°	010/22 -51°
CRP	used from 1648 nm out; 63 nm from the line	150/24	180/19 19°	190/13 14°	200/14 9°	230/5 -4°	170/6 -14°	360/6 -29°	L/V -40°	350/18 -52°
BRO	used from 1698 nm out; 38 nm from the line	150/22	160/18 18°	160/13 14°	150/9 10°	050/5 -3°	L/V -15°	100/13 -29°	120/15 -40°	080/9 -52°

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	from the south-southeast (160°) at 4 knots	10+ mi	none	21 ft	11:53 pm PDT (06:53 UTC)
YKM Yakima, WA	90 nm out, 3 nm east of the line, tower	VFR Sky: overcast at 10,000 feet	from the west-northwest (300°) at 3 knots	10+ mi	10,000 ft	1,098 ft	06:53 UTC
PDT Pendleton, OR	180 nm out, 8 nm northeast of the line, tower	VFR Sky: overcast at 6,500 feet	from the south (180°) at 3 knots	10+ mi	6,500 ft	1,494 ft	06:53 UTC
TWF Twin Falls, ID	449 nm out, 5 nm southwest of the line, tower	VFR Sky: overcast at 3,600 feet Weather: light rain	from the south-southwest (200°) at 9 knots	7 mi	3,600 ft	4,153 ft	06:53 UTC
SLC Salt Lake City, UT	599 nm out, 4 nm northeast of the line, tower	VFR Sky: a few clouds at 4,300 feet, scattered clouds at 6,500 feet, a broken layer at 13,000 feet, overcast at 17,000 feet	from the east-southeast (120°) at 5 knots	10+ mi	13,000 ft	4,230 ft	06:54 UTC
CNY Moab, UT	759 nm out, 4 nm southwest of the line	VFR Sky: overcast at 11,000 feet	from the south (190°) at 15 knots, gusting to 21	10+ mi	11,000 ft	4,579 ft	06:53 UTC
SAF Santa Fe, NM	1019 nm out, 4 nm north of the line, tower	VFR Sky: a few clouds at 4,400 feet, scattered clouds at 6,000 feet, a broken layer at 9,500 feet	variable at 3 knots	10+ mi	9,500 ft	6,348 ft	06:53 UTC
HOB Hobbs, NM	1238 nm out, 5 nm southeast of the line, tower	VFR	from the south (170°) at 10 knots	10+ mi	none	3,660 ft	06:55 UTC
OZA Ozona, TX	1398 nm out, 11 nm northeast of the line	VFR	from the south (170°) at 10 knots, gusting to 14	10+ mi	none	2,376 ft	06:55 UTC
HBV Hebbronville, TX	1638 nm out, 7 nm southwest of the line	VFR	from the east (100°) at 4 knots	10+ mi	none	662 ft	06:15 UTC
HRL Harlingen, TX	destination	VFR	from the southeast (130°) at 5 knots	10+ mi	none	36 ft	1:52 am CDT (06:52 UTC)

The highest airport on this list sits at 6,348 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At HRL when you get there the forecast at the estimated arrival, 3:44 pm CDT (20:44 UTC)

Wind from the south-southeast at 12 knots, gusting to 20, visibility more than 6 miles, scattered clouds at 7,000 feet VFR

The whole forecast for HRL

From Mon 1:00 am CDT (06:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 2,500 feet
From Mon 9:00 am CDT (14:00 UTC): wind from the south-southeast at 7 knots, visibility more than 6 miles, a few clouds at 25,000 feet
From Mon 1:00 pm CDT (18:00 UTC): wind from the south-southeast at 12 knots, gusting to 20, visibility more than 6 miles, scattered clouds at 7,000 feet
From Mon 9:00 pm CDT (02:00 UTC): wind from the southeast at 9 knots, visibility more than 6 miles, a few clouds at 7,000 feet

The forecast for BFI, the departure

From Sun 11:00 pm PDT (06:00 UTC): wind calm, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind calm, 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
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

No temporary flight restriction on or near this route right now.

Daylight

Sunset at BFI 6:25 pm PDT (01:25 UTC), at HRL 7:04 pm CDT (00:04 UTC) (civil twilight ends 7:28 pm CDT (00:28 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 southern Rockies · loop National Weather Service

Radar now, the southern Plains · 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, Valley International.