Boise Air Trml/Gowen Field to Napa County BOI → APC
423 nautical miles (486 statute miles) southwest on a straight line, true course 223°, about 210° magnetic at the departure end (variation 13E). At 120 knots that is 3 h 14 min at the quickest height in today's winds (24,000 ft, a 11-knot tailwind), arriving about 11:09 am PDT (18:09 UTC). Right now BOI is VFR, wind from the northwest (320°) at 8 knots; APC is VFR, wind from the north (360°) 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
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the first 10 nm of the route.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 39 to 403 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Near the route, 49 nm along 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 BOI.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
Winds aloft along the route, and the time en route the forecast for use 14:00–21:00 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 5 forecast points nearest it (BOI, BAM, LKV, RNO, SAC). 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 | 350° at 4 kt | −2 kt | 1 °C | 122 kt | 3 h 28 min | 11:23 am PDT (18:23 UTC) |
| 6,500 ft | 330° at 5 kt | −2 kt | 1 °C | 122 kt | 3 h 28 min | 11:23 am PDT (18:23 UTC) |
| 8,500 ft | 320° at 7 kt | −1 kt | -4 °C | 121 kt | 3 h 30 min | 11:25 am PDT (18:25 UTC) |
| 10,500 ft | 300° at 8 kt | +1 kt | -7 °C | 119 kt | 3 h 33 min | 11:28 am PDT (18:28 UTC) |
| 12,500 ft | 300° at 10 kt | +2 kt | -11 °C | 118 kt | 3 h 35 min | 11:30 am PDT (18:30 UTC) |
| 14,500 ft | 310° at 14 kt | 0 | -13 °C | 120 kt | 3 h 32 min | 11:27 am PDT (18:27 UTC) |
| 16,500 ft | 320° at 18 kt | −3 kt | -16 °C | 123 kt | 3 h 26 min | 11:21 am PDT (18:21 UTC) |
| 18,000 ft FL180 | 320° at 22 kt | −5 kt | -18 °C | 125 kt | 3 h 23 min | 11:18 am PDT (18:18 UTC) |
| 24,000 ft FL240 | 330° at 31 kt | −11 kt | -27 °C | 131 kt | 3 h 14 min | 11:09 am PDT (18:09 UTC) |
| 30,000 ft FL300 | 320° at 28 kt | −3 kt | -35 °C | 123 kt | 3 h 26 min | 11:21 am PDT (18:21 UTC) |
| 34,000 ft FL340 | 280° at 17 kt | +9 kt | -38 °C | 111 kt | 3 h 49 min | 11:44 am PDT (18:44 UTC) |
| 39,000 ft FL390 | 230° at 22 kt | +21 kt | -42 °C | 99 kt | 4 h 16 min | 12:11 pm PDT (19:11 UTC) |
Based on data from the 12th at 12:00 UTC; valid on the 12th at 18:00 UTC for use 14:00 to 21:00 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 | 360/9 1° | L/V -5° | 180/10 -12° | 200/58 -21° | 180/62 -31° | 200/41 -31° | 210/34 -32° | 200/29 -41° | |
| BAM | used from 98 nm out; 102 nm from the line | 270/8 -4° | 260/21 -11° | 190/44 -21° | 200/54 -28° | 210/38 -31° | 220/38 -35° | 210/35 -41° | ||
| LKV | used from 147 nm out; 84 nm from the line | 010/24 -9° | 360/21 -13° | 360/69 -18° | 360/94 -25° | 350/71 -37° | 350/31 -38° | 250/17 -41° | ||
| RNO | used from 197 nm out; 79 nm from the line | L/V | 280/12 -4° | 260/15 -10° | 340/47 -17° | 340/75 -25° | 330/47 -37° | 280/20 -40° | 240/24 -42° | |
| SAC | used from 344 nm out; 24 nm from the line | L/V | 320/8 4° | 330/12 -3° | 350/25 -6° | 350/63 -12° | 340/65 -24° | 340/60 -40° | 340/45 -45° | 290/24 -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: a broken layer at 9,500 feet | from the northwest (320°) at 8 knots | 10+ mi | 9,500 ft | 2,871 ft | 8:53 am MDT (14:53 UTC) |
| REO Rome, OR | 88 nm out, 15 nm northwest of the line | reported, no category | calm | none | 4,053 ft | 14:52 UTC | |
| SVE Susanville, CA | 275 nm out, 21 nm northwest of the line | VFR Sky: a few clouds at 7,500 feet | calm | 8 mi | none | 4,149 ft | 14:35 UTC |
| GOO Grass Valley, CA | 334 nm out, 9 nm southeast of the line | VFR Sky: a few clouds at 9,000 feet | calm | 10+ mi | none | 3,157 ft | 14:35 UTC |
| MHR Sacramento, CA | 373 nm out, 23 nm southeast of the line, tower | VFR | from the south (170°) at 4 knots | 10+ mi | none | 98 ft | 08:15 UTC |
| SMF Sacramento, CA | 383 nm out, 8 nm east of the line, tower | VFR Sky: a few clouds at 11,000 feet | calm | 10+ mi | none | 26 ft | 13:53 UTC |
| APC Napa, CA | destination | VFR | from the north (360°) at 6 knots | 8 mi | none | 35 ft | 6:54 am PDT (13:54 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 APC when you get there the forecast at the estimated arrival, 11:09 am PDT (18:09 UTC)
Wind light and variable, visibility more than 6 miles, clear skies VFR
The whole forecast for APC
- From Mon 5:00 am PDT (12:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
The forecast for BOI, the departure
- From Mon 6:00 am MDT (12:00 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
- 6/3475 BEALE AFB, CA, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local on the route, 354 nm along the route · security · until 1 November · ZOA
Daylight
Sunset at BOI 7:05 pm MDT (01:05 UTC), at APC 6:34 pm PDT (01:34 UTC) (civil twilight ends 7:00 pm PDT (02:00 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, Napa County.