General Edward Lawrence Logan International to Portsmouth International AT Pease BOS → PSM
44 nautical miles (50 statute miles) north on a straight line, true course 011°, about 026° magnetic at the departure end (variation 15W). At 120 knots that is 16 min at the quickest height in today's winds (34,000 ft, a 49-knot tailwind), arriving about 5:15 am EDT (09:15 UTC), after sunset at the destination. 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: 3 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 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist, fog). Over the whole route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the whole route.
- AIRMET ZULU 1C: moderate icing from 12,000 ft to 24,000 ft. Over the last 17 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 BOS.
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 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 1 forecast point nearest it (BOS). 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 | 010° at 12 kt | +11 kt | 109 kt | 24 min | 5:23 am EDT (09:23 UTC) | |
| 5,500 ft | 360° at 18 kt | +18 kt | 102 kt | 26 min | 5:25 am EDT (09:25 UTC) | |
| 7,500 ft | 350° at 19 kt | +18 kt | 8 °C | 102 kt | 26 min | 5:25 am EDT (09:25 UTC) |
| 9,500 ft | 330° at 18 kt | +14 kt | 6 °C | 106 kt | 25 min | 5:24 am EDT (09:24 UTC) |
| 11,500 ft | 300° at 20 kt | +6 kt | 3 °C | 114 kt | 23 min | 5:22 am EDT (09:22 UTC) |
| 13,500 ft | 280° at 24 kt | +1 kt | -1 °C | 119 kt | 22 min | 5:21 am EDT (09:21 UTC) |
| 15,500 ft | 280° at 29 kt | −2 kt | -4 °C | 122 kt | 22 min | 5:21 am EDT (09:21 UTC) |
| 17,500 ft | 270° at 34 kt | −6 kt | -8 °C | 126 kt | 21 min | 5:20 am EDT (09:20 UTC) |
| 18,000 ft FL180 | 270° at 35 kt | −6 kt | -9 °C | 126 kt | 21 min | 5:20 am EDT (09:20 UTC) |
| 24,000 ft FL240 | 260° at 42 kt | −15 kt | -22 °C | 135 kt | 20 min | 5:19 am EDT (09:19 UTC) |
| 30,000 ft FL300 | 250° at 55 kt | −28 kt | -38 °C | 148 kt | 18 min | 5:17 am EDT (09:17 UTC) |
| 34,000 ft FL340 | 240° at 75 kt | −49 kt | -43 °C | 169 kt | 16 min | 5:15 am EDT (09:15 UTC) |
| 39,000 ft FL390 | 250° at 72 kt | −37 kt | -51 °C | 157 kt | 17 min | 5:16 am EDT (09:16 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BOS | used from 0 nm out; 22 nm from the line | 020/10 | 360/20 10° | 340/19 7° | 290/21 2° | 270/35 -9° | 260/42 -22° | 250/55 -38° | 240/75 -43° | 250/72 -51° |
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 |
|---|---|---|---|---|---|---|---|
| BOS Boston, MA | departure | no report just now | 19 ft | ||||
| BVY Beverly, MA | 17 nm out, 4 nm south of the line, tower | no report just now | 107 ft | ||||
| PSM Portsmouth, NH | destination | no report just now | 100 ft |
The highest airport on this list sits at 107 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At PSM when you get there the forecast at the estimated arrival, 5:15 am EDT (09:15 UTC)
PSM has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/8802 Foxborough, MA, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 19 nm from the route, at the departure end · drones kept away from a public gathering · starts Saturday 17 October · ZBW
Daylight
Sunset at BOS 6:07 pm EDT (22:07 UTC), at PSM 6:05 pm EDT (22:05 UTC) (civil twilight ends 6:34 pm EDT (22:34 UTC)). At 120 knots the arrival at PSM is before sunrise there (6:52 am EDT (10:52 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: General Edward Lawrence Logan International, Portsmouth International AT Pease.