Republic Airport to Boeing Fld/King County International FRG → BFI

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

• SIGMET C18C: thunderstorms (a convective SIGMET) up to 36,000 ft, moving from the southwest at 40 knots, until 9:55 am EDT (13:55 UTC). Over the route from 1190 to 1200 nm out.
  as issued

  WSUS32 KKCI 121155
  MKCC WST 121155
  CONVECTIVE SIGMET 18C
  VALID UNTIL 1355Z
  SD ND
  FROM 50NE BIS-70W FAR-40N PIR-40N DPR-50NE BIS
  AREA TS MOV FROM 22040KT. TOPS TO FL360.

• 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 first 520 nm of the route.
• AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 33,000 ft. Over the first 270 nm of the route.
• AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 80 to 230 nm out.
• AIRMET TANGO 2W: 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 470 to 610 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 route from 900 to 1750 nm out.
• AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1320 to 1420 nm out.
• AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 1430 to 1900 nm out.
• AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1590 to 1830 nm out.
• AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 1710 to 2080 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 FRG.

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

Not fetched just now.

At BFI when you get there the forecast at the estimated arrival, 11:14 pm PDT (06:14 UTC)

Wind calm, visibility more than 6 miles, scattered clouds at 25,000 feet VFR

The whole forecast for BFI

• From Mon 5:00 am PDT (12:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
• From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 4 knots, visibility more than 6 miles, clear skies
• From Mon 2:00 pm PDT (21:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, clear skies
• From Mon 8:00 pm PDT (03:00 UTC): wind calm, visibility more than 6 miles, scattered clouds at 25,000 feet
• From Tue 4:00 am PDT (11:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, overcast at 10,000 feet

Temporary flight restrictions on the line or within 25 nm of it

• 5/2811 NEW YORK, NY, Monday, October 20, 2025 through Tuesday, October 20, 2026 Local 10 nm from the route, at the departure end · security · until 20 October · ZNY
• 6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local 10 nm from the route, 1790 nm along the route · a VIP movement · starts Wednesday 14 October · ZSE
• 6/8923 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local 10 nm from the route, 1790 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC

Daylight

Sunset at FRG 6:18 pm EDT (22:18 UTC), at BFI 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 UTC)). At 120 knots the arrival at BFI is after sunset there (6:27 pm PDT (01:27 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.