Boise Air Trml/Gowen Field to Northern Colorado Regional BOI → FNL
533 nautical miles (614 statute miles) east on a straight line, true course 107°, about 094° magnetic at the departure end (variation 13E). At 120 knots that is 3 h 39 min at the quickest height in today's winds (39,000 ft, a 26-knot tailwind), arriving about 4:34 am MDT (10:34 UTC), after sunset at the destination. Right now BOI is VFR, wind from the west (270°) at 7 knots; FNL is VFR, wind from the south-southeast (150°) at 3 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
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the first 109 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 20 to 425 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). Near the route, 49 nm along the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 49 to 454 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Over the last 257 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 237 nm of the route.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 346 to 415 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 356 to 514 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 BOI.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- E175 at 6,300 ft, 22 nm northeast, 10:20 pm MDT (04:20 UTC): overcast above 6,300 ft, remarks: during the descent runway 31. 79 nm along the route, 22 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
- B38M at 21,500 ft, 8 nm southwest, 10:33 pm MDT (04:33 UTC): light turbulence up to 25,000 ft, remarks: during the descent flati star ZDVWC-13. 504 nm along the route, 8 nm southwest of the line.
as filed, and in English
DEN UA /OV DEN305065/TM 0433/FL215/TP B38M/TB LGT BLO 250/RM DURD FLATI STAR. ZDVWC-13
- Report
- a routine report filed through DEN
- Where
- 65 nm northwest (305°) of DEN
- Time
- 04:33 UTC
- Height
- at 21,500 ft
- Aircraft
- B38M
- Turbulence
- light below 25,000 ft
- Remarks
- during the descent flati star ZDVWC-13
- B738 descending, 42 nm southeast, 12:15 am MDT (06:15 UTC): light chop turbulence. At the destination end, 42 nm southeast of the line.
as filed, and in English
DEN UA /OV DEN/TM 0615/FLDURD/TP B738/TB LGT CHOP
- Report
- a routine report filed through DEN
- Where
- over DEN
- Time
- 06:15 UTC
- Height
- during the descent
- Aircraft
- B738
- Turbulence
- light chop
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 4 forecast points nearest it (BOI, PIH, RKS, DEN). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 7,500 ft | 210° at 20 kt | −4 kt | 6 °C | 124 kt | 4 h 18 min | 5:13 am MDT (11:13 UTC) |
| 9,500 ft | 220° at 23 kt | −7 kt | 2 °C | 127 kt | 4 h 12 min | 5:07 am MDT (11:07 UTC) |
| 11,500 ft | 230° at 28 kt | −12 kt | -1 °C | 132 kt | 4 h 02 min | 4:57 am MDT (10:57 UTC) |
| 13,500 ft | 220° at 33 kt | −13 kt | -4 °C | 133 kt | 4 h | 4:55 am MDT (10:55 UTC) |
| 15,500 ft | 220° at 38 kt | −12 kt | -8 °C | 132 kt | 4 h 02 min | 4:57 am MDT (10:57 UTC) |
| 17,500 ft | 220° at 43 kt | −11 kt | -12 °C | 131 kt | 4 h 04 min | 4:59 am MDT (10:59 UTC) |
| 18,000 ft FL180 | 210° at 44 kt | −11 kt | -13 °C | 131 kt | 4 h 04 min | 4:59 am MDT (10:59 UTC) |
| 24,000 ft FL240 | 210° at 58 kt | −11 kt | -25 °C | 131 kt | 4 h 04 min | 4:59 am MDT (10:59 UTC) |
| 30,000 ft FL300 | 220° at 60 kt | −17 kt | -29 °C | 137 kt | 3 h 53 min | 4:48 am MDT (10:48 UTC) |
| 34,000 ft FL340 | 220° at 64 kt | −25 kt | -35 °C | 145 kt | 3 h 41 min | 4:36 am MDT (10:36 UTC) |
| 39,000 ft FL390 | 230° at 58 kt | −26 kt | -43 °C | 146 kt | 3 h 39 min | 4:34 am MDT (10:34 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BOI | used from 0 nm out; 25 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 99 nm out; 41 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° | |
| RKS | used from 247 nm out; 66 nm from the line | 200/41 | 220/44 1° | 220/35 -11° | 220/46 -24° | 210/53 -27° | 220/62 -35° | 230/61 -44° | ||
| DEN | used from 445 nm out; 96 nm from the line | 240/21 14° | 250/44 6° | 220/49 -8° | 220/49 -21° | 230/54 -30° | 240/57 -35° | 240/49 -45° |
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 |
|---|---|---|---|---|---|---|---|
| BOI Boise, ID | departure | VFR Sky: overcast at 9,000 feet | from the west (270°) at 7 knots | 10+ mi | 9,000 ft | 2,871 ft | 11:53 pm MDT (05:53 UTC) |
| SUN Hailey, ID | 79 nm out, 22 nm northeast of the line, tower | low IFR Sky: overcast at 400 feet | from the south (170°) at 7 knots | 7 mi | 400 ft | 5,319 ft | 06:35 UTC |
| PIH Pocatello, ID | 168 nm out, 12 nm north of the line, tower | marginal VFR Sky: overcast at 2,600 feet | calm | 10+ mi | 2,600 ft | 4,451 ft | 06:53 UTC |
| AFO Afton, WY | 237 nm out, 25 nm north of the line | VFR Sky: scattered clouds at 2,800 feet, overcast at 3,800 feet | calm | 10+ mi | 3,800 ft | 6,220 ft | 06:35 UTC |
| EMM Kemmerer, WY | 267 nm out, 20 nm south of the line | VFR | from the west (270°) at 4 knots | 10+ mi | none | 7,288 ft | 06:35 UTC |
| RKS Rock Springs, WY | 336 nm out, 8 nm south of the line | marginal VFR Sky: a few clouds at 2,100 feet, scattered clouds at 2,700 feet, overcast at 3,200 feet Weather: light rain, mist | from the southwest (230°) at 10 knots | 5 mi | 3,200 ft | 6,764 ft | 06:31 UTC |
| DWX Dixon, WY | 415 nm out, 13 nm south of the line | VFR Sky: scattered clouds at 6,000 feet, scattered clouds at 7,000 feet, a broken layer at 10,000 feet | from the south-southeast (160°) at 13 knots, gusting to 23 | 10+ mi | 10,000 ft | 6,548 ft | 06:35 UTC |
| SAA Saratoga, WY | 435 nm out, 22 nm north of the line | reported, no category | from the south-southeast (160°) at 22 knots, gusting to 34 | 10+ mi | none | 7,014 ft | 06:30 UTC |
| FNL Fort Collins/Loveland, CO | destination | VFR | from the south-southeast (150°) at 3 knots | 10+ mi | none | 5,020 ft | 11:56 pm MDT (05:56 UTC) |
The highest airport on this list sits at 7,288 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At FNL when you get there the forecast at the estimated arrival, 4:34 am MDT (10:34 UTC)
FNL has no terminal forecast; use the nearest airport that does.
The forecast for BOI, the departure
- From Mon 12:00 am MDT (06:00 UTC): wind light and variable, visibility more than 6 miles, a broken layer at 8,000 feet
- From Mon 2:00 am MDT (08:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 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
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 BOI 7:05 pm MDT (01:05 UTC), at FNL 6:23 pm MDT (00:23 UTC) (civil twilight ends 6:50 pm MDT (00:50 UTC)). At 120 knots the arrival at FNL is before sunrise there (7:07 am MDT (13:07 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: Boise Air Trml/Gowen Field, Northern Colorado Regional.