Green Bay/Austin Straubel International to Detroit Metro Wayne County GRB → DTW
249 nautical miles (287 statute miles) southeast on a straight line, true course 122°, about 124° magnetic at the departure end (variation 2W). At 120 knots that is 1 h 26 min at the quickest height in today's winds (39,000 ft, a 54-knot tailwind), arriving about 11:12 pm EDT (03:12 UTC), after sunset at the destination. Right now GRB is VFR, wind from the south (190°) at 6 knots; DTW is marginal VFR, wind from the west-northwest (290°) at 4 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: 2,171 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 SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the last 20 nm of the route.
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 20:00–03:00 UTC · at 120 knots true airspeed
The eastbound cruising heights for this course (VFR: odd thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 3 forecast points nearest it (GRB, MKG, CLE). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 3,500 ft | 260° at 8 kt | −6 kt | 126 kt | 1 h 59 min | 11:45 pm EDT (03:45 UTC) | |
| 5,500 ft | 300° at 10 kt | −10 kt | 130 kt | 1 h 55 min | 11:41 pm EDT (03:41 UTC) | |
| 7,500 ft | 300° at 14 kt | −14 kt | 12 °C | 134 kt | 1 h 51 min | 11:37 pm EDT (03:37 UTC) |
| 9,500 ft | 300° at 17 kt | −17 kt | 8 °C | 137 kt | 1 h 49 min | 11:35 pm EDT (03:35 UTC) |
| 11,500 ft | 310° at 17 kt | −17 kt | 4 °C | 137 kt | 1 h 49 min | 11:35 pm EDT (03:35 UTC) |
| 13,500 ft | 310° at 18 kt | −18 kt | 0 °C | 138 kt | 1 h 48 min | 11:34 pm EDT (03:34 UTC) |
| 15,500 ft | 310° at 19 kt | −19 kt | -5 °C | 139 kt | 1 h 47 min | 11:33 pm EDT (03:33 UTC) |
| 17,500 ft | 300° at 21 kt | −21 kt | -9 °C | 141 kt | 1 h 46 min | 11:32 pm EDT (03:32 UTC) |
| 18,000 ft FL180 | 300° at 21 kt | −21 kt | -10 °C | 141 kt | 1 h 46 min | 11:32 pm EDT (03:32 UTC) |
| 24,000 ft FL240 | 320° at 31 kt | −29 kt | -22 °C | 149 kt | 1 h 40 min | 11:26 pm EDT (03:26 UTC) |
| 30,000 ft FL300 | 320° at 46 kt | −43 kt | -37 °C | 163 kt | 1 h 32 min | 11:18 pm EDT (03:18 UTC) |
| 34,000 ft FL340 | 310° at 40 kt | −40 kt | -46 °C | 160 kt | 1 h 33 min | 11:19 pm EDT (03:19 UTC) |
| 39,000 ft FL390 | 290° at 55 kt | −54 kt | -49 °C | 174 kt | 1 h 26 min | 11:12 pm EDT (03:12 UTC) |
Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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 | 240/24 | 260/18 16° | 270/20 11° | 290/14 4° | 280/24 -9° | 300/34 -21° | 310/51 -38° | 310/54 -48° | 300/71 -51° |
| MKG | used from 50 nm out; 43 nm from the line | 250/5 | 320/10 15° | 310/19 9° | 320/21 3° | 310/23 -10° | 330/37 -22° | 330/51 -38° | 320/44 -47° | 300/60 -49° |
| CLE | used from 199 nm out; 108 nm from the line | 340/5 | 320/13 14° | 300/12 8° | 310/10 2° | 310/14 -10° | 340/14 -23° | 320/27 -35° | 260/28 -40° | 250/36 -48° |
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 | VFR | from the south (190°) at 6 knots | 10+ mi | none | 695 ft | 7:53 pm CDT (00:53 UTC) |
| MTW Manitowoc, WI | 30 nm out, 8 nm southwest of the line | VFR | from the south (180°) at 7 knots | 10+ mi | none | 650 ft | 00:56 UTC |
| LDM Ludington, MI | 80 nm out, 13 nm northeast of the line | VFR | from the south-southwest (200°) at 7 knots | 10+ mi | none | 646 ft | 01:35 UTC |
| MKG Muskegon, MI | 110 nm out, 23 nm southwest of the line, tower | VFR Sky: scattered clouds at 25,000 feet | calm | 10+ mi | none | 628 ft | 00:55 UTC |
| GRR Grand Rapids, MI | 149 nm out, 21 nm southwest of the line, tower | VFR Sky: a few clouds at 25,000 feet | from the south (170°) at 5 knots | 10+ mi | none | 793 ft | 00:53 UTC |
| LAN Lansing, MI | 189 nm out, 5 nm west of the line, tower | marginal VFR Sky: overcast at 1,400 feet | from the south (190°) at 4 knots | 10+ mi | 1,400 ft | 860 ft | 01:10 UTC |
| PTK Pontiac, MI | 229 nm out, 21 nm northeast of the line, tower | IFR Sky: a broken layer at 500 feet, overcast at 1,000 feet Weather: mist | calm | 5 mi | 500 ft | 980 ft | 01:14 UTC |
| DTW Detroit, MI | destination | marginal VFR Sky: a few clouds at 500 feet, scattered clouds at 1,200 feet, overcast at 2,000 feet | from the west-northwest (290°) at 4 knots | 9 mi | 2,000 ft | 645 ft | 9:18 pm EDT (01:18 UTC) |
The highest airport on this list sits at 980 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At DTW when you get there the forecast at the estimated arrival, 11:12 pm EDT (03:12 UTC)
Wind light and variable, visibility more than 6 miles, overcast at 1,400 feet marginal VFR
The whole forecast for DTW
- From Sun 8:00 pm EDT (00:00 UTC): wind from the northeast at 4 knots, visibility more than 6 miles, a broken layer at 600 feet, overcast at 1,400 feet
- From Sun 11:00 pm EDT (03:00 UTC): wind light and variable, visibility more than 6 miles, overcast at 1,400 feet
- From Mon 3:00 am EDT (07:00 UTC): wind from the south-southwest at 4 knots, visibility more than 6 miles, a broken layer at 25,000 feet
- At times between Mon 5:00 am EDT (09:00 UTC) and 9:00 am EDT (13:00 UTC): visibility 2 miles, mist, a broken layer at 400 feet
- From Mon 10:00 am EDT (14:00 UTC): wind from the southwest at 11 knots, gusting to 22, visibility more than 6 miles, a broken layer at 25,000 feet
- From Mon 8:00 pm EDT (00:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, scattered clouds at 9,000 feet, a broken layer at 20,000 feet
The forecast for GRB, the departure
- From Sun 7:00 pm CDT (00:00 UTC): wind from the south at 7 knots, visibility more than 6 miles, clear skies
- From Sun 9:00 pm CDT (02:00 UTC): wind from the south at 7 knots, visibility more than 6 miles, low-level wind shear, clear skies
- From Mon 12:00 am CDT (05:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, low-level wind shear, scattered clouds at 20,000 feet
- From Mon 8:00 am CDT (13:00 UTC): wind from the south-southwest at 7 knots, visibility more than 6 miles, a broken layer at 25,000 feet
- From Mon 1:00 pm CDT (18:00 UTC): wind from the southwest at 6 knots, visibility more than 6 miles, scattered clouds at 4,500 feet
Temporary flight restrictions on the line or within 25 nm of it
No temporary flight restriction on or near this route right now.
Daylight
Sunset at GRB 6:13 pm CDT (23:13 UTC), at DTW 6:56 pm EDT (22:56 UTC) (civil twilight ends 7:24 pm EDT (23:24 UTC)). At 120 knots the arrival at DTW is after sunset there (6:58 pm EDT (22:58 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, Detroit Metro Wayne County.