St. Louis Lambert International to Billings Logan International STL → BIL

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

• SIGMET C11C: thunderstorms (a convective SIGMET) up to 31,000 ft, moving from the southwest at 40 knots, until 2:55 am CDT (07:55 UTC). Over the route from 639 to 689 nm out.
  as issued

  WSUS32 KKCI 120555
  MKCC WST 120555
  CONVECTIVE SIGMET 11C
  VALID UNTIL 0755Z
  SD WY
  FROM 60WNW DPR-20SSE DPR-40SSW RAP-60W RAP-60WNW DPR
  DMSHG AREA TS MOV FROM 22040KT. TOPS TO FL310.

• AIRMET TANGO 3W: 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 90 to 439 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 419 nm of the route.
• AIRMET TANGO 1W: 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 669 to 829 nm out.
• AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Over the route from 709 to 819 nm out.
• AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 749 to 869 nm out.
• AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the last 130 nm of the route.
• AIRMET ZULU 2C: moderate icing up to 23,000 ft. Near the route, at the destination end.
• AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Near the route, at the destination end.

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 STL.

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

No pilot reports within 50 nautical miles of the line in the last three hours.

At BIL when you get there the forecast at the estimated arrival, 8:09 am MDT (14:09 UTC)

Wind light and variable, visibility more than 6 miles, showers nearby, a few clouds at 300 feet, overcast at 800 feet IFR

The whole forecast for BIL

• From Mon 12:00 am MDT (06:00 UTC): wind from the north-northwest at 10 knots, visibility 5 miles, light rain snow ice pellets, mist, a few clouds at 300 feet, overcast at 1,000 feet
• At times between Mon 12:00 am MDT (06:00 UTC) and 4:00 am MDT (10:00 UTC): visibility 2 miles, light rain snow ice pellets, mist, a broken layer at 300 feet, overcast at 800 feet
• From Mon 7:00 am MDT (13:00 UTC): wind light and variable, visibility more than 6 miles, showers nearby, a few clouds at 300 feet, overcast at 800 feet
• From Mon 12:00 pm MDT (18:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 800 feet, a broken layer at 2,000 feet
• From Mon 8:00 pm MDT (02:00 UTC): wind from the east at 8 knots, visibility 5 miles, mist, a few clouds at 300 feet, overcast at 1,500 feet

The forecast for STL, the departure

• From Mon 1:00 am CDT (06:00 UTC): wind from the south-southwest at 7 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
• From Mon 11:00 am CDT (16:00 UTC): wind from the southwest at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 25,000 feet
• From Mon 6:00 pm CDT (23:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, a few clouds at 25,000 feet

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

• 6/7634 CENTRALIA, MO, Monday, October 12, 2026 UTC 25 nm from the route, 80 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · today · ZKC

Daylight

Sunset at STL 6:27 pm CDT (23:27 UTC), at BIL 6:32 pm MDT (00:32 UTC) (civil twilight ends 7:02 pm MDT (01:02 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.