Seattle-Tacoma International to St. Louis Downtown Airport SEA → CPS

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

• SIGMET 8C: thunderstorms (a convective SIGMET) up to 32,000 ft, moving from the southwest at 40 knots, until 11:55 pm PDT (06:55 UTC). Over the route from 778 to 828 nm out.
  as issued

  WSUS32 KKCI 120455
  MKCC WST 120455
  CONVECTIVE SIGMET 8C
  VALID UNTIL 0655Z
  NE SD WY
  FROM 50WNW RAP-20SSW RAP-60NW BFF-40ENE DDY-50WNW RAP
  DMSHG AREA TS MOV FROM 22040KT. TOPS TO FL320.

• AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 180 nm of the route.
• AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 120 to 539 nm out.
• AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 219 to 658 nm out.
• AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 259 to 459 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 309 to 1007 nm out.
• AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 549 to 718 nm out.
• AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 588 to 758 nm out.
• AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Over the route from 608 to 828 nm out.
• 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 638 to 818 nm out.
• 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 938 to 1386 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 SEA.

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

• E75L at 1,500 ft, 48 nm south, 9:49 pm PDT (04:49 UTC): remarks: low-level wind shear loss of 8 knots on final. 140 nm along the route, 48 nm south of the line.
  as filed, and in English

  PSC UA /OV PSC120003/TM 0449/FL015/TP E75L/RM LLWS LOSS OF 8 KTS ON FINAL

  Report

  a routine report filed through PSC

  Where

  3 nm southeast (120°) of PSC

  Time

  04:49 UTC

  Height

  at 1,500 ft

  Aircraft

  E75L

  Remarks

  low-level wind shear loss of 8 knots on final

• CL30 at 4,200 ft, 38 nm north, 8:16 pm PDT (03:16 UTC): no icing, overcast above 4,200 ft, remarks: during the descent ils runway 12. 339 nm along the route, 38 nm north of the line.
  as filed, and in English

  MSO UA /OV MSO/TM 0316/FL042/TP CL30/SK OVC042/WX 2 1/2SM/IC NEG/RM DURD ILS RY 12

  Report

  a routine report filed through MSO

  Where

  over MSO

  Time

  03:16 UTC

  Height

  at 4,200 ft

  Aircraft

  CL30

  Sky

  overcast from 4,200 ft

  Weather

  2, 1/2SM

  Icing

  none

  Remarks

  during the descent ils runway 12

• GLF5 descending, 7 nm northeast, 8:46 pm PDT (03:46 UTC): remarks: broke out 100-150FT above ground. 469 nm along the route, 7 nm northeast of the line.
  as filed, and in English

  BZN UA /OV BZN/TM 0346/FLDURD/TP GLF5/RM BROKE OUT 100-150FT AGL

  Report

  a routine report filed through BZN

  Where

  over BZN

  Time

  03:46 UTC

  Height

  during the descent

  Aircraft

  GLF5

  Remarks

  broke out 100-150FT above ground

• UAL1076 at 30,000 ft, 45 nm south, 7:36 pm PDT (02:36 UTC): light turbulence, wind 225° at 60 knots. 638 nm along the route, 45 nm south of the line.
  as filed, and in English

  ARP UAL1076 4405N 10749W 0236 F300 225/060KT TB CONT LGT TURB IC

  Report

  a routine report filed through ARP

At CPS when you get there the forecast at the estimated arrival, 9:48 am CDT (14:48 UTC)

Wind from the southwest at 10 knots, visibility more than 6 miles, a few clouds at 25,000 feet VFR

The whole forecast for CPS

• From Sun 7:00 pm CDT (00:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
• From Mon 3:00 am CDT (08:00 UTC): wind light and variable, visibility 3 miles, mist, a few clouds at 25,000 feet
• At times between Mon 3:00 am CDT (08:00 UTC) and 6:00 am CDT (11:00 UTC): visibility 1 mile, mist
• From Mon 6:00 am CDT (11:00 UTC): wind from the southwest at 10 knots, visibility more than 6 miles, a few clouds at 25,000 feet

The forecast for SEA, the departure

• From Sun 8:00 pm PDT (03:00 UTC): wind from the north at 6 knots, visibility more than 6 miles, clear skies
• From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, visibility more than 6 miles, patches of fog, clear skies
• From Mon 9:00 am PDT (16:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, clear skies
• From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
• From Mon 8:00 pm PDT (03:00 UTC): wind from the northwest at 5 knots, visibility more than 6 miles, scattered 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 17 nm from the route, 1396 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · today · ZKC

Daylight

Sunset at SEA 6:27 pm PDT (01:27 UTC), at CPS 6:27 pm CDT (23:27 UTC) (civil twilight ends 6:53 pm CDT (23:53 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.