General Edward Lawrence Logan International to Bozeman Yellowstone International BOS → BZN

Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of

• SIGMET W70W: thunderstorms (a convective SIGMET) up to 32,000 ft, moving from the southwest at 40 knots, until 9:55 pm EDT (01:55 UTC). Near the route, 1516 nm along the route.
  as issued

  WSUS33 KKCI 112355
  MKCW WST 112355
  CONVECTIVE SIGMET 70W
  VALID UNTIL 0155Z
  MT WY
  FROM 30SSW MLS-60WNW BFF-40SSE OCS-10S BPI-10S BIL-30SSW MLS
  AREA TS MOV FROM 22040KT. TOPS TO FL320.

• AIRMET ZULU 1C: moderate icing up to 24,000 ft. Over the first 259 nm of the route.
• AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the first 259 nm of the route.
• AIRMET TANGO 2W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 259 nm of the route.
• AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 10 to 249 nm out.
• AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 80 to 219 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). Over the last 349 nm of the route.
• AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 329 nm of the route.
• AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 130 nm of the route.
• AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Near the route, 1636 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 BOS.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

Not fetched just now.

At BZN when you get there the forecast at the estimated arrival, 8:21 am MDT (14:21 UTC)

BZN 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 BZN 6:44 pm MDT (00:44 UTC) (civil twilight ends 7:14 pm MDT (01:14 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.