St. Louis Lambert International to Joslin Fld/Magic Valley Regional STL → TWF
1,118 nautical miles (1,286 statute miles) west on a straight line, true course 289°, about 290° magnetic at the departure end (variation 1W). At 120 knots that is 10 h 15 min at the quickest height in today's winds (4,500 ft, a 11-knot headwind), arriving about 12:36 pm MDT (18:36 UTC). Right now STL is VFR, wind from the southwest (220°) at 6 knots; TWF is VFR, wind from the south-southwest (200°) at 12 knots. 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: 1 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 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 70 to 529 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 42,000 ft. Over the route from 629 to 888 nm out.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 649 to 938 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 659 to 828 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 359 nm of the route.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 768 to 808 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the last 309 nm of the route.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. 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
- B38M at 30,000 ft, 29 nm north, 12:45 am CDT (05:45 UTC): moderate chop turbulence. 798 nm along the route, 29 nm north of the line.
as filed, and in English
RIW UA /OV BOY126080/TM 0545/FL300/TP B38M/TB CONS MOD CHOP /ZLC
- Report
- a routine report filed through RIW
- Where
- 80 nm southeast (126°) of BOY
- Time
- 05:45 UTC
- Height
- at 30,000 ft
- Aircraft
- B38M
- Turbulence
- continuous moderate chop zlc
Winds aloft along the route, and the time en route the forecast for use 02:00–09:00 UTC · at 120 knots true airspeed
The westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 10 forecast points nearest it (STL, COU, MKC, OMA, GRI, GLD, BFF, LND, RKS, PIH). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 4,500 ft | 220° at 25 kt | +11 kt | 21 °C | 109 kt | 10 h 15 min | 12:36 pm MDT (18:36 UTC) |
| 6,500 ft | 220° at 23 kt | +12 kt | 18 °C | 108 kt | 10 h 21 min | 12:42 pm MDT (18:42 UTC) |
| 8,500 ft | 220° at 24 kt | +13 kt | 12 °C | 107 kt | 10 h 27 min | 12:48 pm MDT (18:48 UTC) |
| 10,500 ft | 230° at 23 kt | +13 kt | 8 °C | 107 kt | 10 h 27 min | 12:48 pm MDT (18:48 UTC) |
| 12,500 ft | 230° at 23 kt | +13 kt | 3 °C | 107 kt | 10 h 27 min | 12:48 pm MDT (18:48 UTC) |
| 14,500 ft | 230° at 25 kt | +16 kt | -1 °C | 104 kt | 10 h 45 min | 1:06 pm MDT (19:06 UTC) |
| 16,500 ft | 230° at 27 kt | +18 kt | -6 °C | 102 kt | 10 h 58 min | 1:19 pm MDT (19:19 UTC) |
| 18,000 ft FL180 | 230° at 29 kt | +20 kt | -9 °C | 100 kt | 11 h 11 min | 1:32 pm MDT (19:32 UTC) |
| 24,000 ft FL240 | 230° at 39 kt | +23 kt | -21 °C | 97 kt | 11 h 32 min | 1:53 pm MDT (19:53 UTC) |
| 30,000 ft FL300 | 230° at 47 kt | +33 kt | -31 °C | 87 kt | 12 h 51 min | 3:12 pm MDT (21:12 UTC) |
| 34,000 ft FL340 | 240° at 53 kt | +43 kt | -37 °C | 77 kt | 14 h 31 min | 4:52 pm MDT (22:52 UTC) |
| 39,000 ft FL390 | 250° at 54 kt | +48 kt | -47 °C | 72 kt | 15 h 32 min | 5:53 pm MDT (23:53 UTC) |
Based on data from the 12th at 00:00 UTC; valid on the 12th at 06:00 UTC for use 02:00 to 09:00 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| STL | used from 0 nm out; 25 nm from the line | 250/24 | 250/24 16° | 260/23 9° | 270/16 6° | 260/25 -6° | 270/29 -19° | 290/34 -33° | 290/48 -41° | 290/54 -51° |
| COU | used from 50 nm out; 25 nm from the line | 230/31 | 230/30 15° | 260/16 11° | 270/14 6° | 260/24 -6° | 270/27 -18° | 270/37 -32° | 280/49 -41° | 290/56 -51° |
| MKC | used from 150 nm out; 44 nm from the line | 220/44 | 250/28 18° | 250/18 13° | 240/12 6° | 280/24 -6° | 240/34 -18° | 260/47 -30° | 260/51 -40° | 270/58 -50° |
| OMA | used from 250 nm out; 71 nm from the line | 220/47 | 240/33 19° | 250/18 11° | 230/17 6° | 260/29 -8° | 250/33 -19° | 250/51 -33° | 260/61 -40° | 270/62 -49° |
| GRI | used from 299 nm out; 68 nm from the line | 230/35 21° | 230/23 13° | 220/20 7° | 240/25 -8° | 240/37 -20° | 250/49 -33° | 260/57 -38° | 260/58 -47° | |
| GLD | used from 499 nm out; 107 nm from the line | 230/49 | 230/42 15° | 220/26 8° | 240/18 -7° | 230/27 -21° | 240/62 -30° | 240/61 -35° | 250/57 -47° | |
| BFF | used from 549 nm out; 63 nm from the line | 180/28 | 220/33 15° | 210/31 7° | 230/32 -9° | 220/41 -21° | 220/40 -33° | 240/47 -36° | 250/54 -46° | |
| LND | used from 749 nm out; 103 nm from the line | 200/23 6° | 220/31 1° | 220/39 -11° | 230/39 -23° | 220/51 -28° | 220/66 -37° | 230/68 -45° | ||
| RKS | used from 798 nm out; 58 nm from the line | 200/41 | 220/44 1° | 220/35 -11° | 220/46 -24° | 210/53 -27° | 220/62 -35° | 230/61 -44° | ||
| PIH | used from 948 nm out; 71 nm from the line | L/V | 240/13 1° | 240/15 -3° | 210/42 -15° | 200/70 -25° | 220/74 -29° | 220/71 -36° | 220/62 -43° |
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 |
|---|---|---|---|---|---|---|---|
| STL St Louis, MO | departure | VFR Sky: a few clouds at 25,000 feet | from the southwest (220°) at 6 knots | 10+ mi | none | 617 ft | 2:51 am CDT (07:51 UTC) |
| COU Columbia, MO | 80 nm out, 24 nm southwest of the line, tower | VFR | from the south (190°) at 7 knots | 10+ mi | none | 889 ft | 07:54 UTC |
| STJ St Joseph, MO | 220 nm out, 6 nm south of the line, tower | VFR | from the south (180°) at 9 knots | 10+ mi | none | 826 ft | 07:53 UTC |
| BIE Beatrice, NE | 309 nm out, 1 nm north of the line | VFR | from the south (180°) at 10 knots, gusting to 16 | 10+ mi | none | 1,323 ft | 08:15 UTC |
| GRI Grand Island, NE | 389 nm out, 22 nm north of the line, tower | VFR | from the south (180°) at 12 knots | 10+ mi | none | 1,847 ft | 07:53 UTC |
| GTE Gothenburg, NE | 469 nm out, 0 nm southeast of the line | no report just now | 2,558 ft | ||||
| OKS Oshkosh, NE | 569 nm out, 8 nm north of the line | no report just now | 3,394 ft | ||||
| EAN Wheatland, WY | 689 nm out, 24 nm north of the line | VFR | from the southeast (130°) at 5 knots | 10+ mi | none | 4,779 ft | 07:50 UTC |
| RWL Rawlins, WY | 788 nm out, 8 nm southwest of the line | VFR | from the south (180°) at 5 knots | 10+ mi | none | 6,816 ft | 13:53 UTC |
| BPI Big Piney, WY | 928 nm out, 23 nm north of the line | VFR Sky: a broken layer at 3,300 feet | from the southeast (140°) at 4 knots | 10+ mi | 3,300 ft | 6,993 ft | 07:53 UTC |
| BYI Burley, ID | 1088 nm out, 6 nm north of the line | VFR Sky: overcast at 4,200 feet Weather: light rain | from the west-northwest (290°) at 8 knots | 8 mi | 4,200 ft | 4,153 ft | 07:53 UTC |
| TWF Twin Falls, ID | destination | VFR Sky: overcast at 3,900 feet Weather: light rain | from the south-southwest (200°) at 12 knots | 9 mi | 3,900 ft | 4,153 ft | 1:53 am MDT (07:53 UTC) |
The highest airport on this list sits at 6,993 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At TWF when you get there the forecast at the estimated arrival, 12:36 pm MDT (18:36 UTC)
Wind from the west-northwest at 6 knots, visibility more than 6 miles, showers nearby, scattered clouds at 4,000 feet, overcast at 8,000 feet VFR
The whole forecast for TWF
- From Mon 12:00 am MDT (06:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, light rain, a broken layer at 4,000 feet
- From Mon 1:00 am MDT (07:00 UTC): wind from the southwest at 7 knots, visibility 5 miles, light rain, mist, scattered clouds at 1,500 feet, overcast at 2,500 feet
- From Mon 10:00 am MDT (16:00 UTC): wind from the west at 7 knots, visibility 6 miles, light rain showers, mist, scattered clouds at 1,500 feet, a broken layer at 3,500 feet
- From Mon 12:00 pm MDT (18:00 UTC): wind from the west-northwest at 6 knots, visibility more than 6 miles, showers nearby, scattered clouds at 4,000 feet, overcast at 8,000 feet
- From Mon 8:00 pm MDT (02:00 UTC): wind from the west-southwest at 8 knots, visibility more than 6 miles, showers nearby, overcast at 4,000 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 5 nm from the route, 90 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 TWF 6:59 pm MDT (00:59 UTC) (civil twilight ends 7:27 pm MDT (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.
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: St. Louis Lambert International, Joslin Fld/Magic Valley Regional.