Seattle-Tacoma International to Boise Air Trml/Gowen Field SEA → BOI
346 nautical miles (399 statute miles) southeast on a straight line, true course 130°, about 114° magnetic at the departure end (variation 16E). At 120 knots that is 2 h 36 min at the quickest height in today's winds (24,000 ft, a 13-knot tailwind), arriving about 9:57 pm MDT (03:57 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north (350°) at 11 knots; BOI is VFR, wind from the east-southeast (120°) at 9 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: 10,638 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 119 to 267 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 168 to 237 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 40 nm of the route.
- AIRMET ZULU 3C: moderate icing up to 22,000 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 SEA.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- PC12 at 13,000 ft, 8 nm west, 5:42 pm PDT (00:42 UTC): remarks: zse. 49 nm along the route, 8 nm west of the line.
as filed, and in English
YKM UA /OV YKM270050/TM 0042/FL130/TP PC12/SK TOP130/RM -ZSE
- Report
- a routine report filed through YKM
- Where
- 50 nm west (270°) of YKM
- Time
- 00:42 UTC
- Height
- at 13,000 ft
- Aircraft
- PC12
- Sky
- TOP130
- Remarks
- zse
- PC12 at 15,000 ft, 8 nm west, 5:42 pm PDT (00:42 UTC): remarks: zse. 49 nm along the route, 8 nm west of the line.
as filed, and in English
YKM UA /OV YKM270050/TM 0042/FL150/TP PC12/SK TOP130/RM -ZSE
- Report
- a routine report filed through YKM
- Where
- 50 nm west (270°) of YKM
- Time
- 00:42 UTC
- Height
- at 15,000 ft
- Aircraft
- PC12
- Sky
- TOP130
- Remarks
- zse
- C210 at 9,000 ft, 24 nm southwest, 3:51 pm PDT (22:51 UTC): light rime icing, -13 °C, remarks: base 080-ZSE. 158 nm along the route, 24 nm southwest of the line.
as filed, and in English
PDT UA /OV PDT230040/TM 2251/FL090/TP C210/TA M13/IC LGT RIME/RM BASE 080-ZSE
- Report
- a routine report filed through PDT
- Where
- 40 nm southwest (230°) of PDT
- Time
- 22:51 UTC
- Height
- at 9,000 ft
- Aircraft
- C210
- Temperature
- −13 °C
- Icing
- light rime
- Remarks
- base 080-ZSE
- PC12 at 6,000 ft, 34 nm northeast, 5:56 pm PDT (00:56 UTC): overcast above 6,000 ft. 178 nm along the route, 34 nm northeast of the line.
as filed, and in English
ALW UA /OV ALW200015/TM 0056/FL060/TP PC12/SK OVC060
- Report
- a routine report filed through ALW
- Where
- 15 nm south (200°) of ALW
- Time
- 00:56 UTC
- Height
- at 6,000 ft
- Aircraft
- PC12
- Sky
- overcast from 6,000 ft
- CL60 descending, 2 nm southeast, 4:00 pm PDT (23:00 UTC): remarks: + 10 knots on final. At the destination end, 2 nm southeast of the line.
as filed, and in English
BOI UA /OV BOI/TM 2300/FLDURD/TP CL60/RM +/- 10 KTS ON FINAL
- Report
- a routine report filed through BOI
- Where
- over BOI
- Time
- 23:00 UTC
- Height
- during the descent
- Aircraft
- CL60
- Remarks
- + 10 knots on final
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 4 forecast points nearest it (SEA, YKM, LWS, BOI). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 3,500 ft | 020° at 13 kt | −4 kt | 124 kt | 2 h 47 min | 10:08 pm MDT (04:08 UTC) | |
| 5,500 ft | 010° at 13 kt | −7 kt | 4 °C | 127 kt | 2 h 43 min | 10:04 pm MDT (04:04 UTC) |
| 7,500 ft | 020° at 14 kt | −6 kt | -2 °C | 126 kt | 2 h 45 min | 10:06 pm MDT (04:06 UTC) |
| 9,500 ft | 030° at 13 kt | −3 kt | -7 °C | 123 kt | 2 h 49 min | 10:10 pm MDT (04:10 UTC) |
| 11,500 ft | 030° at 8 kt | −2 kt | -10 °C | 122 kt | 2 h 50 min | 10:11 pm MDT (04:11 UTC) |
| 13,500 ft | 020° at 8 kt | −2 kt | -13 °C | 122 kt | 2 h 50 min | 10:11 pm MDT (04:11 UTC) |
| 15,500 ft | 020° at 9 kt | −3 kt | -17 °C | 123 kt | 2 h 49 min | 10:10 pm MDT (04:10 UTC) |
| 17,500 ft | 020° at 11 kt | −4 kt | -20 °C | 124 kt | 2 h 47 min | 10:08 pm MDT (04:08 UTC) |
| 18,000 ft FL180 | 010° at 11 kt | −4 kt | -21 °C | 124 kt | 2 h 47 min | 10:08 pm MDT (04:08 UTC) |
| 24,000 ft FL240 | 360° at 20 kt | −13 kt | -27 °C | 133 kt | 2 h 36 min | 9:57 pm MDT (03:57 UTC) |
| 30,000 ft FL300 | 340° at 12 kt | −10 kt | -36 °C | 130 kt | 2 h 40 min | 10:01 pm MDT (04:01 UTC) |
| 34,000 ft FL340 | 260° at 12 kt | −7 kt | -37 °C | 127 kt | 2 h 43 min | 10:04 pm MDT (04:04 UTC) |
| 39,000 ft FL390 | 250° at 19 kt | −9 kt | -41 °C | 129 kt | 2 h 41 min | 10:02 pm MDT (04:02 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 49 nm out; 17 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° |
| LWS | used from 198 nm out; 99 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° |
| BOI | used from 247 nm out; 74 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° |
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 5,000 feet | from the north (350°) at 11 knots | 10+ mi | none | 432 ft | 5:53 pm PDT (00:53 UTC) |
| ESW Easton, WA | 40 nm out, 21 nm northeast of the line | no report just now | 2,226 ft | ||||
| YKM Yakima, WA | 89 nm out, 7 nm northeast of the line, tower | VFR Sky: overcast at 9,000 feet | calm | 10+ mi | 9,000 ft | 1,098 ft | 00:53 UTC |
| HRI Hermiston, OR | 158 nm out, 10 nm northeast of the line | VFR Sky: a few clouds at 10,000 feet | calm | 10+ mi | none | 644 ft | 00:53 UTC |
| PDT Pendleton, OR | 178 nm out, 16 nm northeast of the line, tower | VFR Sky: overcast at 6,000 feet | from the north-northeast (030°) at 3 knots | 10+ mi | 6,000 ft | 1,494 ft | 00:53 UTC |
| BKE Baker City, OR | 247 nm out, 8 nm north of the line | VFR Sky: a broken layer at 7,000 feet | from the northwest (310°) at 16 knots, gusting to 24 | 10+ mi | 7,000 ft | 3,373 ft | 00:53 UTC |
| ONO Ontario, OR | 307 nm out, 6 nm west of the line | VFR | from the northwest (310°) at 19 knots, gusting to 29 | 10+ mi | none | 2,193 ft | 00:53 UTC |
| BOI Boise, ID | destination | VFR Sky: scattered clouds at 7,000 feet, overcast at 9,000 feet | from the east-southeast (120°) at 9 knots | 10+ mi | 9,000 ft | 2,871 ft | 6:53 pm MDT (00:53 UTC) |
The highest airport on this list sits at 3,373 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At BOI when you get there the forecast at the estimated arrival, 9:57 pm MDT (03:57 UTC)
Wind from the northwest at 11 knots, visibility more than 6 miles, showers nearby, scattered clouds at 5,000 feet, overcast at 7,000 feet VFR
At times between Sun 7:00 pm MDT (01:00 UTC) and 10:00 pm MDT (04:00 UTC): wind variable at 10 knots, light rain showers, overcast at 5,000 feet VFR
The whole forecast for BOI
- From Sun 7:00 pm MDT (01:00 UTC): wind from the northwest at 11 knots, visibility more than 6 miles, showers nearby, scattered clouds at 5,000 feet, overcast at 7,000 feet
- At times between Sun 7:00 pm MDT (01:00 UTC) and 10:00 pm MDT (04:00 UTC): wind variable at 10 knots, light rain showers, overcast at 5,000 feet
- From Mon 12:00 am MDT (06:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, a few clouds at 5,000 feet, a broken layer at 8,000 feet
- From Mon 12:00 pm MDT (18:00 UTC): wind from the northwest at 10 knots, visibility more than 6 miles, a broken layer at 10,000 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 BOI 7:06 pm MDT (01:06 UTC) (civil twilight ends 7:35 pm MDT (01:35 UTC)). At 120 knots the arrival at BOI is after sunset there (7:08 pm MDT (01:08 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
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, Boise Air Trml/Gowen Field.