Plan a flight · Mon 10:19 am CDT (15:19 UTC)

Green Bay/Austin Straubel International to Buffalo Niagara International GRB → BUF

418 nautical miles (481 statute miles) east on a straight line, true course 100°, about 102° 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 57-knot tailwind), arriving about 1:41 pm EDT (17:41 UTC). Right now GRB is VFR, wind from the south-southwest (210°) at 8 knots; BUF is marginal VFR, wind from the west-southwest (240°) 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 SIERRA 1E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, mist). Over the last 10 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

C25A at 24,000 ft, 39 nm north, 9:55 am CDT (14:55 UTC): light rime icing from 19,000 ft to 20,000 ft, -13 °C. 139 nm along the route, 39 nm north of the line.
as filed, and in English
```
GOV UA /OV KGOV/TM 1455/FL240/TP C25A/SK TOP200/TA M13/IC LGT RIME 190-200
```
Report
a routine report filed through GOV
Where
over KGOV
Time
14:55 UTC
Height
at 24,000 ft
Aircraft
C25A
Sky
TOP200
Temperature
−13 °C
Icing
light rime from 19,000 ft to 20,000 ft
UAL513 at 34,000 ft, 23 nm south, 7:52 am CDT (12:52 UTC): no turbulence, wind 306° at 57 knots. 279 nm along the route, 23 nm south of the line.
as filed, and in English
```
ARP UAL513 4310N 08158W 1252 F340 306/057KT TB NONE SK IC
```
Report
a routine report filed through ARP
A320 at 900 ft, 7 nm north, 9:38 am CDT (14:38 UTC): remarks: drud. At the destination end, 7 nm north of the line.
as filed, and in English
```
IAG UA /OV KIAG/TM 1438/FL009/TP A320/SK BASES 009 TOPS UNKN/RM DRUD
```
Report
a routine report filed through IAG
Where
over KIAG
Time
14:38 UTC
Height
at 900 ft
Aircraft
A320
Sky
bases 900 ft tops unknown
Remarks
drud
H25B at 500 ft, 7 nm north, 9:28 am CDT (14:28 UTC): remarks: drud. At the destination end, 7 nm north of the line.
as filed, and in English
```
IAG UA /OV KIAG/TM 1428/FL005/TP H25B/SK BASES 005 TOPS UNKN/RM DRUD
```
Report
a routine report filed through IAG
Where
over KIAG
Time
14:28 UTC
Height
at 500 ft
Aircraft
H25B
Sky
bases 500 ft tops unknown
Remarks
drud
K35R at 900 ft, 7 nm north, 8:57 am CDT (13:57 UTC): remarks: druc. At the destination end, 7 nm north of the line.
as filed, and in English
```
IAG UA /OV KIAG/TM 1357/FL009/TP K35R/SK BASES 009 TOPS UNKN/RM DRUC
```
Report
a routine report filed through IAG
Where
over KIAG
Time
13:57 UTC
Height
at 900 ft
Aircraft
K35R
Sky
bases 900 ft tops unknown
Remarks
druc
A321 at 800 ft, 48 nm east, 10:04 am CDT (15:04 UTC): remarks: B008 above ground during the descent runway 22. At the destination end, 48 nm east of the line.
as filed, and in English
```
ROC UA /OV KROC/TM 1504/FL008/TP A321/RM B008 AGL DURD RWY22
```
Report
a routine report filed through ROC
Where
over KROC
Time
15:04 UTC
Height
at 800 ft
Aircraft
A321
Remarks
B008 above ground during the descent runway 22
CRJ9 at 3,500 ft, 48 nm east, 9:23 am CDT (14:23 UTC): a routine report with nothing remarked on. At the destination end, 48 nm east of the line.
as filed, and in English
```
ROC UA /OV ROC/TM 1423/FL035/TP CRJ9/SK TOPS 035
```
Report
a routine report filed through ROC
Where
over ROC
Time
14:23 UTC
Height
at 3,500 ft
Aircraft
CRJ9
Sky
tops 3,500 ft
CRJ9 at 1,000 ft, 48 nm east, 9:23 am CDT (14:23 UTC): a routine report with nothing remarked on. At the destination end, 48 nm east of the line.
as filed, and in English
```
ROC UA /OV ROC/TM 1423/FL010/TP CRJ9/SK BASES 010
```
Report
a routine report filed through ROC
Where
over ROC
Time
14:23 UTC
Height
at 1,000 ft
Aircraft
CRJ9
Sky
bases 1,000 ft
CRJ9 at 1,100 ft, 0 nm southwest, 8:26 am CDT (13:26 UTC): remarks: during the descent, ils runway 23. At the destination end, 0 nm southwest of the line.
as filed, and in English
```
BUF UA /OV KBUF/TM 1326/FL011/TP CRJ9/SK BASES 600 AGL/RM DURD, ILS RWY 23
```
Report
a routine report filed through BUF
Where
over KBUF
Time
13:26 UTC
Height
at 1,100 ft
Aircraft
CRJ9
Sky
bases 60,000 ft above ground
Remarks
during the descent, ils runway 23
E75L at 3,500 ft, 48 nm east, 8:25 am CDT (13:25 UTC): a routine report with nothing remarked on. At the destination end, 48 nm east of the line.
as filed, and in English
```
ROC UA /OV ROC/TM 1325/FL035/TP E75L/SK TOPS 035 BASES 006
```
Report
a routine report filed through ROC
Where
over ROC
Time
13:25 UTC
Height
at 3,500 ft
Aircraft
E75L
Sky
tops 3,500 ft bases 600 ft
CRJ9 at 1,300 ft, 6 nm southwest, 8:13 am CDT (13:13 UTC): a routine report with nothing remarked on. At the destination end, 6 nm southwest of the line.
as filed, and in English
```
BUF UA /OV PLAZZ/TM 1313/FL013/TP CRJ9/SK BNK013 TOPS 033
```
Report
a routine report filed through BUF
Where
plazz
Time
13:13 UTC
Height
at 1,300 ft
Aircraft
CRJ9
Sky
BNK013 tops 3,300 ft
B737 at 1,100 ft, 0 nm southwest, 7:45 am CDT (12:45 UTC): remarks: during the descent, ils runway 23. At the destination end, 0 nm southwest of the line.
as filed, and in English
```
BUF UA /OV KBUF/TM 1245/FL011/TP B737/SK B011/RM DURD, ILS RWY 23
```
Report
a routine report filed through BUF
Where
over KBUF
Time
12:45 UTC
Height
at 1,100 ft
Aircraft
B737
Sky
B011
Remarks
during the descent, ils runway 23
B737 at 3,200 ft, 10 nm northeast, 7:40 am CDT (12:40 UTC): a routine report with nothing remarked on. At the destination end, 10 nm northeast of the line.
as filed, and in English
```
BUF UA /OV BUF050010/TM 1240/FL032/TP B737/SK BASES 011 TOPS 032
```
Report
a routine report filed through BUF
Where
10 nm northeast (050°) of BUF
Time
12:40 UTC
Height
at 3,200 ft
Aircraft
B737
Sky
bases 1,100 ft tops 3,200 ft

Winds aloft along the route, and the time en route the forecast for use 14:00–21:00 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 4 forecast points nearest it (GRB, TVC, CLE, BUF). 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	270° at 20 kt	−19 kt		139 kt	3 h	2:19 pm EDT (18:19 UTC)
5,500 ft	260° at 24 kt	−23 kt		143 kt	2 h 55 min	2:14 pm EDT (18:14 UTC)
7,500 ft	270° at 27 kt	−27 kt	12 °C	147 kt	2 h 51 min	2:10 pm EDT (18:10 UTC)
9,500 ft	270° at 29 kt	−29 kt	8 °C	149 kt	2 h 48 min	2:07 pm EDT (18:07 UTC)
11,500 ft	290° at 27 kt	−28 kt	5 °C	148 kt	2 h 49 min	2:08 pm EDT (18:08 UTC)
13,500 ft	290° at 28 kt	−28 kt	0 °C	148 kt	2 h 49 min	2:08 pm EDT (18:08 UTC)
15,500 ft	290° at 30 kt	−30 kt	-4 °C	150 kt	2 h 47 min	2:06 pm EDT (18:06 UTC)
17,500 ft	290° at 32 kt	−32 kt	-8 °C	152 kt	2 h 45 min	2:04 pm EDT (18:04 UTC)
18,000 ft FL180	290° at 32 kt	−32 kt	-9 °C	152 kt	2 h 45 min	2:04 pm EDT (18:04 UTC)
24,000 ft FL240	280° at 35 kt	−35 kt	-22 °C	155 kt	2 h 42 min	2:01 pm EDT (18:01 UTC)
30,000 ft FL300	280° at 45 kt	−45 kt	-37 °C	165 kt	2 h 32 min	1:51 pm EDT (17:51 UTC)
34,000 ft FL340	290° at 48 kt	−48 kt	-43 °C	168 kt	2 h 29 min	1:48 pm EDT (17:48 UTC)
39,000 ft FL390	300° at 60 kt	−57 kt	-49 °C	177 kt	2 h 22 min	1:41 pm EDT (17:41 UTC)

Based on data from the 12th at 12:00 UTC; valid on the 12th at 18:00 UTC for use 14:00 to 21:00 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	260/10	240/27 16°	260/31 10°	270/25 5°	280/31 -10°	280/35 -22°	270/46 -37°	290/43 -40°	300/64 -48°
TVC	used from 50 nm out; 46 nm from the line	260/18	250/30 15°	260/34 8°	280/29 5°	280/36 -10°	280/37 -22°	270/50 -37°	290/46 -42°	300/60 -49°
CLE	used from 249 nm out; 129 nm from the line	280/17	270/17 14°	280/22 10°	290/26 4°	290/25 -8°	280/31 -21°	280/35 -36°	280/43 -44°	300/53 -48°
BUF	used from 299 nm out; 95 nm from the line	270/25	300/28 14°	300/29 8°	310/29 2°	300/30 -9°	290/33 -21°	290/44 -37°	290/56 -47°	300/62 -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 8 knots	10+ mi	none	695 ft	9:53 am CDT (14:53 UTC)
MTW Manitowoc, WI	20 nm out, 18 nm south of the line	VFR	from the west-southwest (250°) at 6 knots	10+ mi	none	650 ft	14:56 UTC
MBL Manistee, MI	80 nm out, 3 nm northeast of the line	VFR	calm	10+ mi	none	621 ft	14:56 UTC
CAD Cadillac, MI	119 nm out, 9 nm north of the line	VFR	from the south-southwest (200°) at 6 knots	10+ mi	none	1,306 ft	15:15 UTC
GDW Gladwin, MI	159 nm out, 1 nm southeast of the line	VFR	from the west-southwest (240°) at 6 knots	10+ mi	none	774 ft	14:55 UTC
MBS Saginaw, MI	179 nm out, 23 nm south of the line, tower	VFR	from the southwest (230°) at 10 knots	10+ mi	none	668 ft	14:53 UTC
BAX Bad Axe, MI	229 nm out, 4 nm northwest of the line	VFR	from the west-southwest (240°) at 9 knots	10+ mi	none	763 ft	15:15 UTC
CYSN St Catharines,	398 nm out, 10 nm north of the line	marginal VFR Sky: overcast at 1,400 feet	from the southwest (230°) at 13 knots, gusting to 18	15 mi	1,400 ft	321 ft	15:00 UTC
BUF Buffalo, NY	destination	marginal VFR Sky: a few clouds at 900 feet, overcast at 1,100 feet	from the west-southwest (240°) at 12 knots	10+ mi	1,100 ft	726 ft	10:54 am EDT (14:54 UTC)

The highest airport on this list sits at 1,306 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BUF when you get there the forecast at the estimated arrival, 1:41 pm EDT (17:41 UTC)

Wind from the west-southwest at 6 knots, visibility more than 6 miles, overcast at 1,200 feet marginal VFR

The whole forecast for BUF

From Mon 8:00 am EDT (12:00 UTC): wind from the southwest at 4 knots, visibility more than 6 miles, scattered clouds at 700 feet, overcast at 1,500 feet
From Mon 11:00 am EDT (15:00 UTC): wind from the west-southwest at 6 knots, visibility more than 6 miles, overcast at 1,200 feet
From Mon 2:00 pm EDT (18:00 UTC): wind from the west-southwest at 10 knots, gusting to 18, visibility more than 6 miles, a broken layer at 3,000 feet
From Mon 7:00 pm EDT (23:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, a broken layer at 20,000 feet
From Mon 9:00 pm EDT (01:00 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 Tue 5:00 am EDT (09:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, scattered clouds at 9,000 feet
30% chance between Tue 6:00 am EDT (10:00 UTC) and 8:00 am EDT (12:00 UTC): visibility 4 miles, light rain showers, a broken layer at 7,000 feet

The forecast for GRB, the departure

From Mon 7:00 am CDT (12:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, scattered clouds at 20,000 feet
From Mon 8:00 pm CDT (01:00 UTC): wind from the east-southeast at 3 knots, visibility more than 6 miles, scattered clouds at 6,000 feet, a broken layer at 10,000 feet
30% chance between Mon 9:00 pm CDT (02:00 UTC) and 11:00 pm CDT (04:00 UTC): light rain showers, a broken layer at 6,000 feet
From Mon 11:00 pm CDT (04:00 UTC): wind from the south at 4 knots, visibility more than 6 miles, a broken layer at 2,000 feet
From Tue 3:00 am CDT (08:00 UTC): wind from the west at 5 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 BUF 6:37 pm EDT (22:37 UTC) (civil twilight ends 7:06 pm EDT (23:06 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

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

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

Radar now, the Northeast · 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, Buffalo Niagara International.