Napa County to Boise Air Trml/Gowen Field APC → BOI
423 nautical miles (486 statute miles) northeast on a straight line, true course 039°, about 024° magnetic at the departure end (variation 15E). At 120 knots that is 2 h 51 min at the quickest height in today's winds (39,000 ft, a 28-knot tailwind), arriving about 7:52 am MDT (13:52 UTC), after sunset at the destination. Right now APC is VFR, wind calm; BOI is VFR, wind from the west-northwest (290°) at 4 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 39,000 ft. Over the first 334 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 APC.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- A35K at 32,000 ft, 7 nm southeast, 1:39 am PDT (08:39 UTC): moderate chop turbulence, remarks: fdcs zoa. At the departure end, 7 nm southeast of the line.
as filed, and in English
OAK UA /OV OAK348024/TM 0839/FL320/TP A35K/TB MOD CHOP/RM FDCS ZOA
- Report
- a routine report filed through OAK
- Where
- 24 nm north (348°) of OAK
- Time
- 08:39 UTC
- Height
- at 32,000 ft
- Aircraft
- A35K
- Turbulence
- moderate chop
- Remarks
- fdcs zoa
Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 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 (SAC, RNO, LKV, 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 |
|---|---|---|---|---|---|---|
| 5,500 ft | 330° at 6 kt | +2 kt | 1 °C | 118 kt | 3 h 35 min | 8:36 am MDT (14:36 UTC) |
| 7,500 ft | 330° at 6 kt | +2 kt | -3 °C | 118 kt | 3 h 35 min | 8:36 am MDT (14:36 UTC) |
| 9,500 ft | 300° at 7 kt | −1 kt | -6 °C | 121 kt | 3 h 30 min | 8:31 am MDT (14:31 UTC) |
| 11,500 ft | 280° at 8 kt | −3 kt | -9 °C | 123 kt | 3 h 26 min | 8:27 am MDT (14:27 UTC) |
| 13,500 ft | 300° at 10 kt | −2 kt | -12 °C | 122 kt | 3 h 28 min | 8:29 am MDT (14:29 UTC) |
| 15,500 ft | 310° at 12 kt | +1 kt | -14 °C | 119 kt | 3 h 33 min | 8:34 am MDT (14:34 UTC) |
| 17,500 ft | 320° at 15 kt | +4 kt | -17 °C | 116 kt | 3 h 39 min | 8:40 am MDT (14:40 UTC) |
| 18,000 ft FL180 | 330° at 16 kt | +5 kt | -17 °C | 115 kt | 3 h 41 min | 8:42 am MDT (14:42 UTC) |
| 24,000 ft FL240 | 350° at 31 kt | +21 kt | -26 °C | 99 kt | 4 h 16 min | 9:17 am MDT (15:17 UTC) |
| 30,000 ft FL300 | 320° at 28 kt | +7 kt | -34 °C | 113 kt | 3 h 45 min | 8:46 am MDT (14:46 UTC) |
| 34,000 ft FL340 | 260° at 26 kt | −19 kt | -36 °C | 139 kt | 3 h 03 min | 8:04 am MDT (14:04 UTC) |
| 39,000 ft FL390 | 240° at 29 kt | −28 kt | -41 °C | 148 kt | 2 h 51 min | 7:52 am MDT (13:52 UTC) |
Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SAC | used from 0 nm out; 22 nm from the line | L/V | L/V 4° | 340/9 -4° | 340/22 -8° | 360/71 -12° | 360/82 -23° | 350/58 -37° | 310/30 -40° | 270/25 -44° |
| RNO | used from 98 nm out; 43 nm from the line | 010/6 | 270/12 -3° | 220/26 -10° | 280/13 -19° | 350/44 -24° | 320/30 -32° | 260/22 -36° | 240/24 -42° | |
| LKV | used from 197 nm out; 85 nm from the line | 010/10 -8° | 360/20 -11° | 360/58 -19° | 360/92 -25° | 350/69 -37° | 310/34 -37° | 240/26 -41° | ||
| BOI | used from 295 nm out; 103 nm from the line | 320/11 1° | 280/8 -5° | 220/14 -11° | 200/60 -19° | 190/66 -31° | 210/46 -32° | 220/50 -33° | 220/43 -39° |
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 |
|---|---|---|---|---|---|---|---|
| APC Napa, CA | departure | VFR | calm | 10+ mi | none | 35 ft | 3:54 am PDT (10:54 UTC) |
| SMF Sacramento, CA | 39 nm out, 8 nm east of the line, tower | VFR Sky: a few clouds at 11,000 feet | from the south (190°) at 4 knots | 10+ mi | none | 26 ft | 10:53 UTC |
| MHR Sacramento, CA | 49 nm out, 23 nm southeast of the line, tower | VFR | from the southeast (140°) at 4 knots | 10+ mi | none | 98 ft | 07:35 UTC |
| GOO Grass Valley, CA | 88 nm out, 9 nm southeast of the line | VFR Sky: a broken layer at 8,000 feet | calm | 10+ mi | 8,000 ft | 3,157 ft | 10:55 UTC |
| SVE Susanville, CA | 147 nm out, 21 nm northwest of the line | VFR Sky: a broken layer at 9,000 feet | from the southwest (230°) at 5 knots | 10+ mi | 9,000 ft | 4,149 ft | 10:55 UTC |
| REO Rome, OR | 334 nm out, 15 nm northwest of the line | reported, no category | from the southeast (140°) at 8 knots | none | 4,053 ft | 10:52 UTC | |
| BOI Boise, ID | destination | VFR Sky: scattered clouds at 9,000 feet | from the west-northwest (290°) at 4 knots | 10+ mi | none | 2,871 ft | 4:53 am MDT (10:53 UTC) |
The highest airport on this list sits at 4,149 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, 7:52 am MDT (13:52 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 VFR
The whole forecast for BOI
- 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
The forecast for APC, the departure
- From Sun 11:00 pm PDT (06:00 UTC): wind from the northeast at 3 knots, visibility more than 6 miles, clear skies
- From Mon 12:00 pm PDT (19:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, clear skies
Temporary flight restrictions on the line or within 25 nm of it
- 6/3475 BEALE AFB, CA, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local on the route, 59 nm along the route · security · until 1 November · ZOA
Daylight
Sunset at APC 6:34 pm PDT (01:34 UTC), at BOI 7:05 pm MDT (01:05 UTC) (civil twilight ends 7:33 pm MDT (01:33 UTC)). At 120 knots the arrival at BOI is before sunrise there (7:55 am MDT (13:55 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: Napa County, Boise Air Trml/Gowen Field.