St. George Regional to Boeing Fld/King County International SGU → BFI
740 nautical miles (852 statute miles) northwest on a straight line, true course 331°, about 319° magnetic at the departure end (variation 12E). At 120 knots that is 5 h 55 min at the quickest height in today's winds (39,000 ft, a 5-knot tailwind), arriving about 11:09 pm PDT (06:09 UTC), after sunset at the destination. Right now SGU is VFR, wind from the north (360°) at 4 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: 4 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 SIERRA 2E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the first 89 nm of the route.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the first 395 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the first 316 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 109 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the first 563 nm of the route.
- AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Near the route, 109 nm along the route.
- AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 503 to 612 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 SGU.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- UAL493 at 24,000 ft, 14 nm south, 4:54 pm MDT (22:54 UTC): moderate turbulence. At the departure end, 14 nm south of the line.
as filed, and in English
ARP UAL493 3648N 11330W 2254 F240 TB MODERATE SK IN CLOUDS IC LIGHT
- Report
- a routine report filed through ARP
- TBM8 at 19,000 ft, 34 nm northeast, 3:58 pm MDT (21:58 UTC): light rime icing from 10,000 ft to 18,000 ft, -20 °C. 385 nm along the route, 34 nm northeast of the line.
as filed, and in English
BOI UA /OV BOI209055/TM 2158/FL190/TP TBM8/TA M20/IC LGT RIME 180-100 /ZLC
- Report
- a routine report filed through BOI
- Where
- 55 nm southwest (209°) of BOI
- Time
- 21:58 UTC
- Height
- at 19,000 ft
- Aircraft
- TBM8
- Temperature
- −20 °C
- Icing
- light rime from 18,000 ft to 10,000 ft zlc
- E75L at 25,000 ft, 38 nm northeast, 3:19 pm MDT (21:19 UTC): light to moderate chop turbulence, -21 °C. 395 nm along the route, 38 nm northeast of the line.
as filed, and in English
BOI UA /OV BOI220050/TM 2119/FL250/TP E75L/TA M21/TB CONS LGT OCNL MOD CHOP/IC CLR /ZLC
- Report
- a routine report filed through BOI
- Where
- 50 nm southwest (220°) of BOI
- Time
- 21:19 UTC
- Height
- at 25,000 ft
- Aircraft
- E75L
- Temperature
- −21 °C
- Turbulence
- continuous light occasional moderate chop
- Icing
- clear zlc
- C210 at 9,000 ft, 15 nm northeast, 4:51 pm MDT (22:51 UTC): light rime icing, -13 °C, remarks: base 080-ZSE. 572 nm along the route, 15 nm northeast 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
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 7 forecast points nearest it (BCE, ELY, BAM, BOI, RDM, 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 | 360° at 14 kt | +11 kt | 0 °C | 109 kt | 6 h 47 min | 12:01 am PDT (07:01 UTC) |
| 6,500 ft | 010° at 14 kt | +11 kt | -1 °C | 109 kt | 6 h 47 min | 12:01 am PDT (07:01 UTC) |
| 8,500 ft | 350° at 4 kt | +3 kt | -1 °C | 117 kt | 6 h 19 min | 11:33 pm PDT (06:33 UTC) |
| 10,500 ft | 270° at 4 kt | +1 kt | -4 °C | 119 kt | 6 h 13 min | 11:27 pm PDT (06:27 UTC) |
| 12,500 ft | 260° at 7 kt | +2 kt | -8 °C | 118 kt | 6 h 16 min | 11:30 pm PDT (06:30 UTC) |
| 14,500 ft | 260° at 8 kt | +2 kt | -12 °C | 118 kt | 6 h 16 min | 11:30 pm PDT (06:30 UTC) |
| 16,500 ft | 260° at 9 kt | +2 kt | -15 °C | 118 kt | 6 h 16 min | 11:30 pm PDT (06:30 UTC) |
| 18,000 ft FL180 | 260° at 10 kt | +2 kt | -18 °C | 118 kt | 6 h 16 min | 11:30 pm PDT (06:30 UTC) |
| 24,000 ft FL240 | 270° at 8 kt | +3 kt | -26 °C | 117 kt | 6 h 19 min | 11:33 pm PDT (06:33 UTC) |
| 30,000 ft FL300 | 240° at 26 kt | +1 kt | -32 °C | 119 kt | 6 h 13 min | 11:27 pm PDT (06:27 UTC) |
| 34,000 ft FL340 | 230° at 33 kt | −3 kt | -36 °C | 123 kt | 6 h 01 min | 11:15 pm PDT (06:15 UTC) |
| 39,000 ft FL390 | 230° at 36 kt | −5 kt | -42 °C | 125 kt | 5 h 55 min | 11:09 pm PDT (06:09 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BCE | used from 0 nm out; 79 nm from the line | 210/47 0° | 200/50 -12° | 220/31 -23° | 220/56 -26° | 220/58 -35° | 230/58 -45° | |||
| ELY | used from 49 nm out; 76 nm from the line | 210/20 4° | 240/21 -1° | 230/37 -13° | 200/58 -25° | 220/73 -27° | 220/73 -36° | 220/69 -44° | ||
| BAM | used from 197 nm out; 51 nm from the line | 270/8 4° | 230/27 -4° | 220/49 -18° | 210/52 -26° | 220/77 -29° | 220/71 -33° | 220/63 -43° | ||
| BOI | used from 345 nm out; 92 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° | |
| RDM | used from 444 nm out; 109 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° | |
| YKM | used from 592 nm out; 44 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 691 nm out; 21 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 |
|---|---|---|---|---|---|---|---|
| SGU St George, UT | departure | VFR Sky: a few clouds at 3,400 feet, a broken layer at 6,000 feet, overcast at 10,000 feet Weather: light rain | from the north (360°) at 4 knots | 10+ mi | 6,000 ft | 2,883 ft | 5:56 pm MDT (23:56 UTC) |
| ELY Ely, NV | 148 nm out, 12 nm northeast of the line | VFR | from the south (190°) at 8 knots | 10+ mi | none | 6,259 ft | 23:53 UTC |
| EKO Elko, NV | 247 nm out, 20 nm northeast of the line | VFR | from the southwest (220°) at 4 knots | 10+ mi | none | 5,139 ft | 23:56 UTC |
| REO Rome, OR | 385 nm out, 8 nm west of the line | reported, no category | variable at 5 knots | none | 4,053 ft | 23:52 UTC | |
| GCD John Day, OR | 503 nm out, 12 nm northeast of the line | VFR Sky: scattered clouds at 3,000 feet, a broken layer at 6,000 feet | from the north-northwest (340°) at 12 knots, gusting to 16 | 10+ mi | 6,000 ft | 3,702 ft | 23:55 UTC |
| PLU Puyallup, WA | 720 nm out, 14 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 6,259 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, 11:09 pm PDT (06:09 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 SGU, the departure
- From Sun 6:00 pm MDT (00:00 UTC): wind light and variable, visibility more than 6 miles, light rain showers, scattered clouds at 3,000 feet, a broken layer at 6,000 feet
- From Sun 9:00 pm MDT (03:00 UTC): wind from the south-southeast at 8 knots, visibility more than 6 miles, low-level wind shear, scattered clouds at 4,000 feet, a broken layer at 8,000 feet
- 30% chance between Sun 9:00 pm MDT (03:00 UTC) and 3:00 am MDT (09:00 UTC): wind variable at 10 knots, gusting to 25, light rain showers, a broken layer at 4,000 feet
- From Mon 8:00 am MDT (14:00 UTC): wind from the south-southeast at 12 knots, gusting to 20, visibility more than 6 miles, light rain showers, scattered clouds at 3,000 feet, a broken layer at 6,000 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 SGU 7:01 pm MDT (01:01 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 after sunset there (6:29 pm PDT (01:29 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: St. George Regional, Boeing Fld/King County International.