Green Bay/Austin Straubel International to Great Falls International GRB → GTF
982 nautical miles (1,130 statute miles) west on a straight line, true course 289°, about 291° magnetic at the departure end (variation 2W). At 120 knots that is 8 h 32 min at the quickest height in today's winds (4,500 ft, a 5-knot headwind), arriving about 2:49 pm MDT (20:49 UTC). 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
- SIGMET C18C: thunderstorms (a convective SIGMET) up to 36,000 ft, moving from the southwest at 40 knots, until 8:55 am CDT (13:55 UTC). Over the route from 466 to 536 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 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the last 685 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 665 to 754 nm out.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the last 218 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 893 to 972 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 GRB.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 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 9 forecast points nearest it (GRB, LSE, MSP, AXN, ABR, DIK, MLS, GGW, GTF). 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 | 240° at 7 kt | +5 kt | 2 °C | 115 kt | 8 h 32 min | 2:49 pm MDT (20:49 UTC) |
| 6,500 ft | 240° at 11 kt | +8 kt | 10 °C | 112 kt | 8 h 46 min | 3:03 pm MDT (21:03 UTC) |
| 8,500 ft | 230° at 16 kt | +10 kt | 8 °C | 110 kt | 8 h 56 min | 3:13 pm MDT (21:13 UTC) |
| 10,500 ft | 240° at 19 kt | +13 kt | 4 °C | 107 kt | 9 h 11 min | 3:28 pm MDT (21:28 UTC) |
| 12,500 ft | 240° at 21 kt | +16 kt | 1 °C | 104 kt | 9 h 27 min | 3:44 pm MDT (21:44 UTC) |
| 14,500 ft | 240° at 24 kt | +18 kt | -3 °C | 102 kt | 9 h 38 min | 3:55 pm MDT (21:55 UTC) |
| 16,500 ft | 240° at 27 kt | +20 kt | -7 °C | 100 kt | 9 h 49 min | 4:06 pm MDT (22:06 UTC) |
| 18,000 ft FL180 | 240° at 28 kt | +22 kt | -11 °C | 98 kt | 10 h 01 min | 4:18 pm MDT (22:18 UTC) |
| 24,000 ft FL240 | 240° at 34 kt | +27 kt | -23 °C | 93 kt | 10 h 34 min | 4:51 pm MDT (22:51 UTC) |
| 30,000 ft FL300 | 240° at 38 kt | +29 kt | -36 °C | 91 kt | 10 h 47 min | 5:04 pm MDT (23:04 UTC) |
| 34,000 ft FL340 | 250° at 50 kt | +43 kt | -40 °C | 77 kt | 12 h 45 min | 7:02 pm MDT (01:02 UTC) |
| 39,000 ft FL390 | 250° at 60 kt | +56 kt | -47 °C | 64 kt | 15 h 21 min | 9:38 pm MDT (03:38 UTC) |
Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| GRB | used from 0 nm out; 25 nm from the line | 250/32 | 250/22 17° | 240/18 8° | 280/21 6° | 280/34 -11° | 280/35 -21° | 280/39 -37° | 270/52 -45° | 290/60 -49° |
| LSE | used from 99 nm out; 76 nm from the line | 250/25 | 240/21 17° | 240/28 11° | 250/28 5° | 280/24 -10° | 280/31 -21° | 260/35 -37° | 270/45 -43° | 280/59 -47° |
| MSP | used from 149 nm out; 58 nm from the line | 250/12 | 250/17 17° | 240/26 12° | 250/26 5° | 280/26 -9° | 280/32 -22° | 270/37 -38° | 280/47 -41° | 280/55 -48° |
| AXN | used from 248 nm out; 46 nm from the line | 110/6 | 260/10 16° | 240/17 12° | 250/20 5° | 260/29 -10° | 260/35 -22° | 260/29 -38° | 270/48 -41° | 270/61 -48° |
| ABR | used from 397 nm out; 60 nm from the line | 080/12 | 210/12 17° | 220/22 12° | 230/26 5° | 220/28 -10° | 230/41 -21° | 250/36 -36° | 260/47 -39° | 260/63 -47° |
| DIK | used from 546 nm out; 61 nm from the line | 190/12 5° | 230/29 7° | 220/33 1° | 220/43 -11° | 210/47 -23° | 220/53 -33° | 240/56 -40° | 250/72 -47° | |
| MLS | used from 695 nm out; 59 nm from the line | 290/17 -1° | 250/18 0° | 230/25 0° | 220/31 -11° | 220/32 -24° | 220/50 -32° | 220/60 -38° | 230/71 -46° | |
| GGW | used from 794 nm out; 61 nm from the line | 100/7 -1° | 070/10 -3° | 190/6 -4° | 210/34 -10° | 230/33 -24° | 210/48 -37° | 230/65 -40° | 230/71 -46° | |
| GTF | used from 893 nm out; 64 nm from the line | L/V | L/V -7° | 240/8 -8° | 240/30 -14° | 240/40 -28° | 210/52 -38° | 210/76 -38° | 220/72 -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 |
|---|---|---|---|---|---|---|---|
| GRB Green Bay, WI | departure | no report just now | 695 ft | ||||
| CWA Mosinee, WI | 69 nm out, 4 nm south of the line, tower | no report just now | 1,277 ft | ||||
| EAU Eau Claire, WI | 139 nm out, 22 nm southwest of the line, tower | no report just now | 913 ft | ||||
| STC St Cloud, MN | 258 nm out, 11 nm south of the line, tower | no report just now | 1,030 ft | ||||
| AXN Alexandria, MN | 318 nm out, 6 nm south of the line | no report just now | 1,425 ft | ||||
| GWR Gwinner, ND | 417 nm out, 7 nm south of the line | no report just now | 1,265 ft | ||||
| BIS Bismarck, ND | 546 nm out, 2 nm north of the line, tower | no report just now | 1,661 ft | ||||
| DIK Dickinson, ND | 635 nm out, 11 nm south of the line | no report just now | 2,592 ft | ||||
| GDV Glendive, MT | 714 nm out, 0 nm south of the line | no report just now | 2,458 ft | ||||
| JDN Jordan, MT | 804 nm out, 2 nm northeast of the line | no report just now | 2,667 ft | ||||
| LWT Lewistown, MT | 903 nm out, 22 nm south of the line | no report just now | 4,170 ft | ||||
| GTF Great Falls, MT | destination | no report just now | 3,680 ft |
The highest airport on this list sits at 4,170 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At GTF when you get there the forecast at the estimated arrival, 2:49 pm MDT (20:49 UTC)
GTF has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/6656 ANOKA, MN, Monday, October 5, 2026 through Monday, October 19, 2026 Local 23 nm from the route, 228 nm along the route · security · until 19 October · ZMP
Daylight
Sunset at GRB 6:13 pm CDT (23:13 UTC), at GTF 6:41 pm MDT (00:41 UTC) (civil twilight ends 7:12 pm MDT (01:12 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: Green Bay/Austin Straubel International, Great Falls International.