Plan a flight · Sun 5:19 pm PDT (00:19 UTC)

Jacqueline Cochran Regional to Boeing Fld/King County International TRM → BFI

880 nautical miles (1,012 statute miles) north on a straight line, true course 343°, about 330° magnetic at the departure end (variation 13E). At 120 knots that is 7 h 06 min at the quickest height in today's winds (39,000 ft, a 4-knot tailwind), arriving about 12:25 am PDT (07:25 UTC), after sunset at the destination. Right now TRM is VFR, wind from the north (350°) at 5 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: 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

SIGMET W72W: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 20 knots, until 6:55 pm PDT (01:55 UTC). Over the route from 280 to 320 nm out.
as issued
```
WSUS33 KKCI 112355
MKCW WST 112355
CONVECTIVE SIGMET 72W
VALID UNTIL 0155Z
NV
FROM 60SSW BAM-60W ELY-OAL-40WNW OAL-60SSW BAM
AREA TS MOV FROM 23020KT. TOPS TO FL300.
```
AIRMET TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 12,000 ft. Over the first 170 nm of the route.
AIRMET SIERRA 6E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Near the route, at the departure end.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 40 to 90 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 50 to 150 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Near the route, 180 nm along the route.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 640 to 690 nm out.
AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 660 to 740 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 TRM.

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

B38M at 14,000 ft, 28 nm west, 5:13 pm PDT (00:13 UTC): moderate turbulence, light rime icing, 8 °C. 50 nm along the route, 28 nm west of the line.
as filed, and in English
```
ONT UA /OV ONT053034/TM 0013/FL140/TP B38M/TA 08/TB MODERATE TURBULENCE/IC LIGHT RIME ICE 190 - 170
```
Report
a routine report filed through ONT
Where
34 nm northeast (053°) of ONT
Time
00:13 UTC
Height
at 14,000 ft
Aircraft
B38M
Temperature
8 °C
Turbulence
moderate turbulence
Icing
light rime ice at 19,000 ft at 17,000 ft
E75L at 18,000 ft, 41 nm west, 4:24 pm PDT (23:24 UTC): moderate turbulence from 18,000 ft to 22,000 ft, remarks: mountain wave a 10-knot loss of airspeed entered by zoa fdcs. 260 nm along the route, 41 nm west of the line.
as filed, and in English
```
LOL UA /OV BIH300011/TM 2324/FL 180/TP E75L/TB MOD 180-220/RM MTN WAVE /-10 ENTERED BY ZOA FDCS AWC-WEB
```
Report
a routine report filed through LOL
Where
11 nm northwest (300°) of BIH
Time
23:24 UTC
Height
at 18,000 ft
Aircraft
E75L
Turbulence
moderate from 18,000 ft to 22,000 ft
Remarks
mountain wave a 10-knot loss of airspeed entered by zoa fdcs
E75L at 10,000 ft, 38 nm southwest, 3:04 pm PDT (22:04 UTC): moderate rime icing, -9 °C, remarks: from 10,000 ft to 7,500 ft during the descent. 800 nm along the route, 38 nm southwest of the line.
as filed, and in English
```
PDX UA /OV PDX360025/TM 2204/FL100/TP E75L/TA M9/IC MOD RIME /RM 100-075 DURD
```
Report
a routine report filed through PDX
Where
25 nm north (360°) of PDX
Time
22:04 UTC
Height
at 10,000 ft
Aircraft
E75L
Temperature
−9 °C
Icing
moderate rime
Remarks
from 10,000 ft to 7,500 ft during the descent
A21N at 29,500 ft, 14 nm east, 3:50 pm PDT (22:50 UTC): remarks: mountain wave 10-15 kts/zlawc. 90 nm along the route, 14 nm east of the line.
as filed, and in English
```
DAG UA /OV DAG045010/TM 2250/FL295/TP A21N/RM MTN WAVE /- 10-15 KTS/ZLAWC AWC-WEB
```
Report
a routine report filed through DAG
Where
10 nm northeast (045°) of DAG
Time
22:50 UTC
Height
at 29,500 ft
Aircraft
A21N
Remarks
mountain wave 10-15 kts/zlawc
BCS3 at 31,000 ft, 38 nm east, 3:44 pm PDT (22:44 UTC): remarks: mountain wave 20 kts/zlawc. 100 nm along the route, 38 nm east of the line.
as filed, and in English
```
DAG UA /OV DAG030040/TM 2244/FL310/TP BCS3/RM MTN WAVE /- 20 KTS/ZLAWC AWC-WEB
```
Report
a routine report filed through DAG
Where
40 nm northeast (030°) of DAG
Time
22:44 UTC
Height
at 31,000 ft
Aircraft
BCS3
Remarks
mountain wave 20 kts/zlawc
A20N at 23,000 ft, 45 nm east, 2:37 pm PDT (21:37 UTC): light rime icing from 21,000 ft to 23,000 ft, -21 °C, remarks: during the climb zlawc. 100 nm along the route, 45 nm east of the line.
as filed, and in English
```
CDC UA /OV LAS210050/TM 2137/FL230/TP A20N/TA M21/IC LGT RIME 210-230/RM DURC ZLAWC AWC-WEB
```
Report
a routine report filed through CDC
Where
50 nm southwest (210°) of LAS
Time
21:37 UTC
Height
at 23,000 ft
Aircraft
A20N
Temperature
−21 °C
Icing
light rime from 21,000 ft to 23,000 ft
Remarks
during the climb zlawc
B38M at 37,000 ft, 21 nm east, 3:25 pm PDT (22:25 UTC): -41 °C, wind 215° at 61 knots, remarks: produced by skypath. 210 nm along the route, 21 nm east of the line.
as filed, and in English
```
TPH UA /OV BTY308020 /TM 2225 /FL370 /TP B38M /TA M41 /WV 21561KT /RM PRODUCED BY SKYPATH
```
Report
a routine report filed through TPH
Where
20 nm northwest (308°) of BTY
Time
22:25 UTC
Height
at 37,000 ft
Aircraft
B38M
Temperature
−41 °C
Wind
from 215° at 61 knots
Remarks
produced by skypath
PC24 at 40,000 ft, 40 nm east, 4:10 pm PDT (23:10 UTC): light to moderate turbulence. 490 nm along the route, 40 nm east of the line.
as filed, and in English
```
LOL UA /OV SDO291023/TM 2310/FL400/TP PC24/TB LGT OCNL MOD /ZLC
```
Report
a routine report filed through LOL
Where
23 nm west (291°) of SDO
Time
23:10 UTC
Height
at 40,000 ft
Aircraft
PC24
Turbulence
light occasional moderate zlc
E75L at 9,000 ft, 32 nm west, 4:05 pm PDT (23:05 UTC): light rime icing, -6 °C, remarks: zse. 670 nm along the route, 32 nm west of the line.
as filed, and in English
```
RDM UA /OV DSD155012/TM 2305/FL090/TP E75L/TA M06/IC LGT RIME/RM ZSE
```
Report
a routine report filed through RDM
Where
12 nm southeast (155°) of DSD
Time
23:05 UTC
Height
at 9,000 ft
Aircraft
E75L
Temperature
−6 °C
Icing
light rime
Remarks
zse
E75L at 9,500 ft, 23 nm southwest, 4:07 pm PDT (23:07 UTC): light rime icing from 7,000 ft to 9,500 ft, a broken layer above 7,300 ft, -2 °C, remarks: during the descent runway 5. 680 nm along the route, 23 nm southwest of the line.
as filed, and in English
```
RDM UA /OV RDM/TM 2307/FL095/TP E75L/SK BKN073-TOPSUNKN/TA M2/IC LGT RIME 095-070/RM DURD RWY 5
```
Report
a routine report filed through RDM
Where
over RDM
Time
23:07 UTC
Height
at 9,500 ft
Aircraft
E75L
Sky
a broken layer from 7,300 ft, tops unknown
Temperature
−2 °C
Icing
light rime from 9,500 ft to 7,000 ft
Remarks
during the descent runway 5
E170 at 10,000 ft, 23 nm southwest, 3:02 pm PDT (22:02 UTC): light rime icing from 7,000 ft to 10,000 ft. 680 nm along the route, 23 nm southwest of the line.
as filed, and in English
```
RDM UA /OV RDM/TM 2202/FL100/TP E170/SK BASE 065-TOPS UNKN/TA UNKN/IC LGT RIME 100-070
```
Report
a routine report filed through RDM
Where
over RDM
Time
22:02 UTC
Height
at 10,000 ft
Aircraft
E170
Sky
base 065-TOPS unknown
Temperature
UNKN
Icing
light rime from 10,000 ft to 7,000 ft
C182 at 8,000 ft, 36 nm west, 3:52 pm PDT (22:52 UTC): light rime icing, -2 °C. 780 nm along the route, 36 nm west of the line.
as filed, and in English
```
PDX UA /OV PDX040017/TM 2252/FL080/TP C182/TA M02/IC LGT RIME
```
Report
a routine report filed through PDX
Where
17 nm northeast (040°) of PDX
Time
22:52 UTC
Height
at 8,000 ft
Aircraft
C182
Temperature
−2 °C
Icing
light rime

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 8 forecast points nearest it (ONT, WJF, BIH, RNO, LKV, RDM, PDX, 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	310° at 3 kt	+3 kt	0 °C	117 kt	7 h 31 min	12:50 am PDT (07:50 UTC)
6,500 ft	300° at 3 kt	+2 kt	1 °C	118 kt	7 h 27 min	12:46 am PDT (07:46 UTC)
8,500 ft	310° at 4 kt	+3 kt	-3 °C	117 kt	7 h 31 min	12:50 am PDT (07:50 UTC)
10,500 ft	270° at 5 kt	+1 kt	-4 °C	119 kt	7 h 24 min	12:43 am PDT (07:43 UTC)
12,500 ft	260° at 7 kt	0	-8 °C	120 kt	7 h 20 min	12:39 am PDT (07:39 UTC)
14,500 ft	270° at 6 kt	+2 kt	-11 °C	118 kt	7 h 27 min	12:46 am PDT (07:46 UTC)
16,500 ft	290° at 6 kt	+4 kt	-15 °C	116 kt	7 h 35 min	12:54 am PDT (07:54 UTC)
18,000 ft FL180	300° at 7 kt	+5 kt	-17 °C	115 kt	7 h 39 min	12:58 am PDT (07:58 UTC)
24,000 ft FL240	310° at 15 kt	+12 kt	-25 °C	108 kt	8 h 09 min	1:28 am PDT (08:28 UTC)
30,000 ft FL300	270° at 21 kt	+7 kt	-31 °C	113 kt	7 h 47 min	1:06 am PDT (08:06 UTC)
34,000 ft FL340	250° at 23 kt	−1 kt	-35 °C	121 kt	7 h 16 min	12:35 am PDT (07:35 UTC)
39,000 ft FL390	250° at 28 kt	−4 kt	-42 °C	124 kt	7 h 06 min	12:25 am PDT (07:25 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
ONT	used from 0 nm out; 65 nm from the line	230/11	200/17 6°	230/27 4°	230/32 -2°	210/39 -12°	220/51 -20°	220/48 -29°	210/51 -34°	210/52 -44°
WJF	used from 100 nm out; 84 nm from the line		220/30 8°	240/28 5°	230/34 -2°	220/34 -13°	220/48 -20°	220/47 -29°	210/48 -34°	220/52 -44°
BIH	used from 150 nm out; 80 nm from the line		L/V	210/14 6°	210/20 -2°	230/26 -14°	220/32 -24°	220/63 -27°	220/56 -35°	230/50 -44°
RNO	used from 350 nm out; 60 nm from the line		320/7	260/13 1°	230/21 -7°	210/38 -17°	220/43 -26°	230/54 -29°	230/59 -32°	230/54 -41°
LKV	used from 450 nm out; 82 nm from the line			010/18 -6°	280/7 -11°	290/9 -22°	280/13 -27°	290/20 -31°	260/19 -34°	260/27 -39°
RDM	used from 600 nm out; 58 nm from the line		010/15 -2°	030/21 -8°	020/26 -12°	020/46 -22°	010/72 -27°	360/47 -34°	340/31 -35°	320/20 -40°
PDX	used from 750 nm out; 53 nm from the line	330/7	360/13 0°	040/22 -6°	030/23 -12°	020/64 -18°	010/93 -25°	010/91 -39°	360/62 -40°	350/41 -43°
SEA	used from 800 nm out; 51 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
TRM Palm Springs, CA	departure	VFR	from the north (350°) at 5 knots	10+ mi	none	-114 ft	4:52 pm PDT (23:52 UTC)
PSP Palm Springs, CA	20 nm out, 14 nm southwest of the line, tower	VFR Sky: a few clouds at 5,500 feet	from the north-northwest (330°) at 7 knots	10+ mi	none	476 ft	23:53 UTC
GAB Gabbs, NV	330 nm out, 10 nm east of the line	no report just now				4,699 ft
LOL Lovelock, NV	400 nm out, 6 nm northeast of the line	VFR	from the north-northeast (030°) at 15 knots	10+ mi	none	3,907 ft	23:53 UTC
RDM Redmond, OR	680 nm out, 23 nm southwest of the line, tower	VFR Sky: a few clouds at 4,000 feet, a broken layer at 4,900 feet	from the north-northwest (330°) at 12 knots	10+ mi	4,900 ft	3,081 ft	23:56 UTC
DLS The Dalles, OR	760 nm out, 6 nm east of the line	VFR Sky: overcast at 9,500 feet	from the west-southwest (240°) at 3 knots	10+ mi	9,500 ft	246 ft	23:53 UTC
PLU Puyallup, WA	860 nm out, 9 nm southwest of the line	VFR Weather: light drizzle	calm	10+ mi	none	537 ft	23:35 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 4,699 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, 12:25 am PDT (07:25 UTC)

Wind light and variable, visibility more than 6 miles, 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 TRM, the departure

From Sun 5:00 pm PDT (00:00 UTC): wind from the northwest at 10 knots, visibility more than 6 miles, scattered clouds at 10,000 feet
From Mon 1:00 am PDT (08:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 10,000 feet
From Mon 2:00 pm PDT (21:00 UTC): wind from the west at 12 knots, visibility more than 6 miles, a few clouds at 10,000 feet

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

6/8887 Indio, CA, Sunday, October 11, 2026 through Monday, October 12, 2026 Local 4 nm from the route, at the departure end · security · until 12 October · ZLA

Daylight

Sunset at TRM 6:14 pm PDT (01:14 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 Pacific Southwest · 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: Jacqueline Cochran Regional, Boeing Fld/King County International.