Plan a flight · Sun 9:08 pm CDT (02:08 UTC)

Green Bay/Austin Straubel International to Louisville Muhammad Ali International GRB → SDF

394 nautical miles (453 statute miles) south on a straight line, true course 163°, about 165° magnetic at the departure end (variation 2W). At 120 knots that is 2 h 22 min at the quickest height in today's winds (39,000 ft, a 46-knot tailwind), arriving about 12:30 am EDT (04:30 UTC), after sunset at the destination. Right now GRB is VFR, wind from the south (190°) at 6 knots; SDF is VFR, wind from the south-southwest (200°) 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: 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

No SIGMET or AIRMET covers any part of this route right now.

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

E295 at 37,000 ft, 30 nm west, 7:53 pm CDT (00:53 UTC): light chop turbulence. 79 nm along the route, 30 nm west of the line.
as filed, and in English
```
UES UA /OV BAE/TM 0053/FL370/TP E295/TB OCNL LGT CHOP
```
Report
a routine report filed through UES
Where
over BAE
Time
00:53 UTC
Height
at 37,000 ft
Aircraft
E295
Turbulence
occasional light chop
CRJ7 at 17,000 ft, 7 nm east, 7:04 pm CDT (00:04 UTC): no turbulence. 148 nm along the route, 7 nm east of the line.
as filed, and in English
```
BEH UA /OV ELX270040/TM 0004/FL170/TP CRJ7/TB NEG
```
Report
a routine report filed through BEH
Where
40 nm west (270°) of ELX
Time
00:04 UTC
Height
at 17,000 ft
Aircraft
CRJ7
Turbulence
none
B39M at 35,000 ft, 27 nm west, 7:29 pm CDT (00:29 UTC): no turbulence, remarks: smooth. 177 nm along the route, 27 nm west of the line.
as filed, and in English
```
IKK UA /OV CGT/TM 0029/FL350/TP B39M/TB NEG/RM SMOOTH
```
Report
a routine report filed through IKK
Where
over CGT
Time
00:29 UTC
Height
at 35,000 ft
Aircraft
B39M
Turbulence
none
Remarks
smooth
E170 at 23,000 ft, 12 nm west, 6:14 pm CDT (23:14 UTC): light turbulence. 276 nm along the route, 12 nm west of the line.
as filed, and in English
```
IND UA /OV VHP315020/TM 2314/FL230/TP E170/TB LGT
```
Report
a routine report filed through IND
Where
20 nm northwest (315°) of VHP
Time
23:14 UTC
Height
at 23,000 ft
Aircraft
E170
Turbulence
light
A21N at 17,000 ft, 12 nm west, 8:28 pm CDT (01:28 UTC): no icing, clear from 17,000 ft to 60,000 ft, remarks: clear since departing KIND southbound. 345 nm along the route, 12 nm west of the line.
as filed, and in English
```
IND UA /OV IND183045/TM 0128/FL170/TP A21N/SK SKC/IC NEG/RM CLR SINCE DEPARTING KIND SOUTHBOUND
```
Report
a routine report filed through IND
Where
45 nm south (183°) of IND
Time
01:28 UTC
Height
at 17,000 ft
Aircraft
A21N
Sky
clear
Icing
none
Remarks
clear since departing KIND southbound
B38M at 21,000 ft, 9 nm southeast, 8:09 pm CDT (01:09 UTC): no turbulence, no icing. At the destination end, 9 nm southeast of the line.
as filed, and in English
```
SDF UA /OV IIU/TM 0109/FL210/TP B38M/TB NEG/IC NEG
```
Report
a routine report filed through SDF
Where
over IIU
Time
01:09 UTC
Height
at 21,000 ft
Aircraft
B38M
Turbulence
none
Icing
none

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 6 forecast points nearest it (GRB, MKG, JOT, FWA, IND, LOU). 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	300° at 9 kt	−6 kt		126 kt	3 h 08 min	1:16 am EDT (05:16 UTC)
5,500 ft	330° at 15 kt	−15 kt		135 kt	2 h 55 min	1:03 am EDT (05:03 UTC)
7,500 ft	330° at 19 kt	−19 kt	13 °C	139 kt	2 h 50 min	12:58 am EDT (04:58 UTC)
9,500 ft	330° at 22 kt	−21 kt	9 °C	141 kt	2 h 48 min	12:56 am EDT (04:56 UTC)
11,500 ft	340° at 23 kt	−23 kt	5 °C	143 kt	2 h 45 min	12:53 am EDT (04:53 UTC)
13,500 ft	330° at 24 kt	−23 kt	0 °C	143 kt	2 h 45 min	12:53 am EDT (04:53 UTC)
15,500 ft	330° at 24 kt	−24 kt	-4 °C	144 kt	2 h 44 min	12:52 am EDT (04:52 UTC)
17,500 ft	330° at 25 kt	−24 kt	-9 °C	144 kt	2 h 44 min	12:52 am EDT (04:52 UTC)
18,000 ft FL180	330° at 25 kt	−24 kt	-10 °C	144 kt	2 h 44 min	12:52 am EDT (04:52 UTC)
24,000 ft FL240	330° at 37 kt	−36 kt	-21 °C	156 kt	2 h 32 min	12:40 am EDT (04:40 UTC)
30,000 ft FL300	330° at 47 kt	−45 kt	-37 °C	165 kt	2 h 23 min	12:31 am EDT (04:31 UTC)
34,000 ft FL340	320° at 46 kt	−42 kt	-44 °C	162 kt	2 h 26 min	12:34 am EDT (04:34 UTC)
39,000 ft FL390	310° at 54 kt	−46 kt	-48 °C	166 kt	2 h 22 min	12:30 am EDT (04:30 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 49 nm out; 62 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°
JOT	used from 148 nm out; 53 nm from the line	230/11	290/12 16°	300/19 10°	320/19 4°	300/17 -9°	330/31 -20°	320/49 -37°	320/53 -45°	320/67 -49°
FWA	used from 197 nm out; 70 nm from the line	350/9	350/24 15°	360/25 9°	360/29 4°	350/31 -10°	340/39 -22°	330/40 -37°	320/38 -43°	320/48 -48°
IND	used from 246 nm out; 27 nm from the line	320/10	350/30 16°	350/32 10°	350/30 4°	340/31 -10°	340/42 -21°	340/49 -37°	320/46 -41°	320/47 -47°
LOU	used from 345 nm out; 23 nm from the line	320/15	340/24 14°	330/28 9°	340/34 4°	340/37 -9°	340/42 -20°	320/39 -35°	320/45 -39°	330/40 -47°

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	8:53 pm CDT (01:53 UTC)
MTW Manitowoc, WI	30 nm out, 13 nm northeast of the line	VFR	from the south (170°) at 6 knots	10+ mi	none	650 ft	01:56 UTC
MWC Milwaukee, WI	79 nm out, 20 nm west of the line, tower	VFR	from the south (190°) at 4 knots	10+ mi	none	744 ft	01:55 UTC
MKE Milwaukee, WI	89 nm out, 17 nm southwest of the line, tower	VFR	from the south (190°) at 7 knots	10+ mi	none	728 ft	01:52 UTC
GYY Gary/Chicago, IN	177 nm out, 19 nm west of the line, tower	VFR	calm	9 mi	none	596 ft	01:50 UTC
LAF Lafayette, IN	246 nm out, 18 nm southwest of the line, tower	VFR	calm	10+ mi	none	605 ft	01:54 UTC
IND Indianapolis, IN	295 nm out, 2 nm south of the line, tower	VFR	calm	10+ mi	none	796 ft	01:54 UTC
BAK Columbus, IN	325 nm out, 11 nm east of the line, tower	VFR	calm	10+ mi	none	656 ft	01:45 UTC
IMS Madison, IN	364 nm out, 21 nm east of the line	marginal VFR Sky: overcast at 1,900 feet	calm	10+ mi	1,900 ft	819 ft	22:15 UTC
SDF Louisville, KY	destination	VFR	from the south-southwest (200°) at 4 knots	10+ mi	none	500 ft	9:56 pm EDT (01:56 UTC)

The highest airport on this list sits at 819 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At SDF when you get there the forecast at the estimated arrival, 12:30 am EDT (04:30 UTC)

Wind from the southwest at 3 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for SDF

From Sun 8:00 pm EDT (00:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, a broken layer at 2,500 feet
From Sun 8:30 pm EDT (00:30 UTC): wind from the southwest at 3 knots, visibility more than 6 miles, clear skies
From Mon 6:00 am EDT (10:00 UTC): wind from the south-southeast at 3 knots, visibility 4 miles, mist, clear skies
From Mon 9:00 am EDT (13:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, clear skies

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 SDF 7:09 pm EDT (23:09 UTC) (civil twilight ends 7:36 pm EDT (23:36 UTC)). At 120 knots the arrival at SDF is before sunrise there (7:48 am EDT (11:48 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

Radar now, the upper Mississippi valley · loop National Weather Service

Radar now, the central Great Lakes · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

Forecast chart, 24 hours ahead Weather Prediction Center

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, Louisville Muhammad Ali International.