Green Bay/Austin Straubel International to St. Louis Downtown Airport GRB → CPS
367 nautical miles (422 statute miles) south on a straight line, true course 195°, about 197° magnetic at the departure end (variation 2W). At 120 knots that is 2 h 46 min at the quickest height in today's winds (39,000 ft, a 13-knot tailwind), arriving about 5:34 am CDT (10:34 UTC), after sunset at the destination. Right now GRB is VFR, wind from the south-southwest (210°) at 6 knots; CPS is VFR, wind from the south (170°) at 3 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), from 1:00 am CDT (06:00 UTC). Near the route, at the departure 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 GRB.
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.
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 4 forecast points nearest it (GRB, JOT, SPI, STL). 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 | 250° at 23 kt | +13 kt | 107 kt | 3 h 26 min | 6:14 am CDT (11:14 UTC) | |
| 6,500 ft | 260° at 22 kt | +9 kt | 15 °C | 111 kt | 3 h 18 min | 6:06 am CDT (11:06 UTC) |
| 8,500 ft | 260° at 21 kt | +9 kt | 10 °C | 111 kt | 3 h 18 min | 6:06 am CDT (11:06 UTC) |
| 10,500 ft | 260° at 17 kt | +8 kt | 7 °C | 112 kt | 3 h 17 min | 6:05 am CDT (11:05 UTC) |
| 12,500 ft | 260° at 14 kt | +6 kt | 4 °C | 114 kt | 3 h 13 min | 6:01 am CDT (11:01 UTC) |
| 14,500 ft | 270° at 17 kt | +6 kt | 0 °C | 114 kt | 3 h 13 min | 6:01 am CDT (11:01 UTC) |
| 16,500 ft | 270° at 21 kt | +5 kt | -4 °C | 115 kt | 3 h 11 min | 5:59 am CDT (10:59 UTC) |
| 18,000 ft FL180 | 270° at 24 kt | +4 kt | -7 °C | 116 kt | 3 h 10 min | 5:58 am CDT (10:58 UTC) |
| 24,000 ft FL240 | 280° at 30 kt | +5 kt | -19 °C | 115 kt | 3 h 11 min | 5:59 am CDT (10:59 UTC) |
| 30,000 ft FL300 | 290° at 32 kt | −1 kt | -34 °C | 121 kt | 3 h 02 min | 5:50 am CDT (10:50 UTC) |
| 34,000 ft FL340 | 290° at 49 kt | −5 kt | -43 °C | 125 kt | 2 h 56 min | 5:44 am CDT (10:44 UTC) |
| 39,000 ft FL390 | 300° at 62 kt | −13 kt | -53 °C | 133 kt | 2 h 46 min | 5:34 am CDT (10:34 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| GRB | used from 0 nm out; 25 nm from the line | 250/36 | 270/23 16° | 270/14 9° | 240/18 4° | 280/26 -9° | 280/29 -20° | 290/42 -36° | 290/51 -45° | 290/72 -55° |
| JOT | used from 99 nm out; 66 nm from the line | 250/23 | 270/22 15° | 250/16 10° | 240/9 4° | 280/22 -7° | 280/29 -19° | 300/29 -34° | 290/50 -43° | 300/64 -52° |
| SPI | used from 198 nm out; 64 nm from the line | 220/21 | 250/23 16° | 260/27 9° | 270/14 6° | 270/23 -7° | 270/31 -19° | 270/28 -33° | 290/48 -42° | 300/55 -52° |
| STL | used from 347 nm out; 12 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° |
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-southwest (210°) at 6 knots | 10+ mi | none | 695 ft | 1:53 am CDT (06:53 UTC) |
| OSH Oshkosh, WI | 30 nm out, 11 nm west of the line, tower | VFR | from the south-southwest (200°) at 10 knots | 10+ mi | none | 808 ft | 06:53 UTC |
| RYV Watertown, WI | 79 nm out, 6 nm southwest of the line | VFR | from the south (170°) at 3 knots | 10+ mi | none | 832 ft | 07:35 UTC |
| JVL Janesville, WI | 119 nm out, 10 nm west of the line, tower | VFR | calm | 10+ mi | none | 807 ft | 07:35 UTC |
| RFD Chicago/Rockford, IL | 149 nm out, 8 nm northwest of the line, tower | VFR Sky: a broken layer at 25,000 feet | from the south (170°) at 3 knots | 10+ mi | 25,000 ft | 742 ft | 06:54 UTC |
| VYS Peru, IL | 198 nm out, 6 nm northeast of the line | VFR | from the south-southwest (200°) at 5 knots | 10+ mi | none | 654 ft | 06:35 UTC |
| PIA Peoria, IL | 238 nm out, 10 nm west of the line, tower | VFR | calm | 10+ mi | none | 660 ft | 06:54 UTC |
| AAA Lincoln, IL | 267 nm out, 14 nm east of the line | VFR | calm | 10+ mi | none | 594 ft | 18:15 UTC |
| SPI Springfield, IL | 287 nm out, 3 nm east of the line, tower | VFR | from the south (190°) at 6 knots | 10+ mi | none | 597 ft | 06:52 UTC |
| ALN Alton/St Louis, IL | 347 nm out, 0 nm east of the line, tower | VFR | from the south (190°) at 5 knots | 10+ mi | none | 543 ft | 07:35 UTC |
| CPS Cahokia/St Louis, IL | destination | VFR | from the south (170°) at 3 knots | 10+ mi | none | 412 ft | 1:53 am CDT (06:53 UTC) |
The highest airport on this list sits at 832 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At CPS when you get there the forecast at the estimated arrival, 5:34 am CDT (10:34 UTC)
Wind from the south at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet VFR
The whole forecast for CPS
- From Mon 1:00 am CDT (06:00 UTC): wind from the south at 5 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 10 knots, visibility more than 6 miles, clear skies
The forecast for GRB, the departure
- From Mon 1:00 am CDT (06:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, low-level wind shear, a broken layer at 25,000 feet
- From Mon 5:00 am CDT (10:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, a broken layer at 20,000 feet
- From Mon 11:00 am CDT (16:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, clear skies
- From Mon 5:00 pm CDT (22:00 UTC): wind from the south at 4 knots, visibility more than 6 miles, scattered clouds at 6,000 feet, scattered clouds at 15,000 feet
- 30% chance between Mon 6:00 pm CDT (23:00 UTC) and 10:00 pm CDT (03:00 UTC): light rain showers, a broken layer at 6,000 feet
- From Mon 10:00 pm CDT (03:00 UTC): wind from the east-southeast at 4 knots, visibility more than 6 miles, scattered clouds at 2,000 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 CPS 6:27 pm CDT (23:27 UTC) (civil twilight ends 6:53 pm CDT (23:53 UTC)). At 120 knots the arrival at CPS is before sunrise there (7:06 am CDT (12:06 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, St. Louis Downtown Airport.