Plan a flight · Mon 7:26 am EDT (11:26 UTC)

The Florida Keys Marathon International to Springfield Robertson County MTH → M91

771 nautical miles (887 statute miles) north on a straight line, true course 338°, about 342° magnetic at the departure end (variation 4W). At 120 knots that is 7 h 04 min at the quickest height in today's winds (12,500 ft, a 11-knot headwind), arriving about 1:30 pm CDT (18:30 UTC). Right now MTH is VFR, wind from the northeast (050°) at 6 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: 6 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 2W: moderate turbulence above 18,000 ft from 30,000 ft to 41,000 ft. Near the route, 277 nm along the route.
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 79 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 MTH.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

B38M at 21,000 ft, 4 nm southwest, 6:51 am EDT (10:51 UTC): no turbulence, remarks: during the descent. 99 nm along the route, 4 nm southwest of the line.
as filed, and in English
```
RSW UA /OV RSW180020/TM 1051/FL210/TP B38M/TB NEG/RM DURD
```
Report
a routine report filed through RSW
Where
20 nm south (180°) of RSW
Time
10:51 UTC
Height
at 21,000 ft
Aircraft
B38M
Turbulence
none
Remarks
during the descent
B737 at 21,000 ft, 18 nm northeast, 7:07 am EDT (11:07 UTC): no chop turbulence from 12,000 ft to 21,000 ft, clear from 21,000 ft to 60,000 ft. 257 nm along the route, 18 nm northeast of the line.
as filed, and in English
```
CGC UA /OV CGC/TM 1107/FL210/TP B737/SK SKC/TB NEG CHOP 120-210
```
Report
a routine report filed through CGC
Where
over CGC
Time
11:07 UTC
Height
at 21,000 ft
Aircraft
B737
Sky
clear
Turbulence
no chop from 12,000 ft to 21,000 ft
B738 at 38,000 ft, 42 nm northeast, 7:09 am EDT (11:09 UTC): no turbulence. 267 nm along the route, 42 nm northeast of the line.
as filed, and in English
```
OCF UA /OV OCF/TM 1109/FL380/TP B738/TB NEG
```
Report
a routine report filed through OCF
Where
over OCF
Time
11:09 UTC
Height
at 38,000 ft
Aircraft
B738
Turbulence
none
E55P at 25,000 ft, 35 nm southwest, 6:45 am EDT (10:45 UTC): light to moderate chop turbulence. 336 nm along the route, 35 nm southwest of the line.
as filed, and in English
```
TLH UA /OV TLH165050/TM 1045/FL250/TP E55P/TB CONS LGT-MOD CHOP
```
Report
a routine report filed through TLH
Where
50 nm south (165°) of TLH
Time
10:45 UTC
Height
at 25,000 ft
Aircraft
E55P
Turbulence
continuous light to moderate chop
B739 at 34,000 ft, 4 nm northwest, 6:53 am EDT (10:53 UTC): light to moderate turbulence. 346 nm along the route, 4 nm northwest of the line.
as filed, and in English
```
TLH UA /OV SZW120050/TM 1053/FL340/TP B739/TB CONS LGT OCNL MOD
```
Report
a routine report filed through TLH
Where
50 nm southeast (120°) of SZW
Time
10:53 UTC
Height
at 34,000 ft
Aircraft
B739
Turbulence
continuous light occasional moderate
E55P at 1,000 ft, 32 nm southwest, 7:04 am EDT (11:04 UTC): clear, remarks: fog. 385 nm along the route, 32 nm southwest of the line.
as filed, and in English
```
TLH UA /OV TLH/TM 1104/FL010/TP E55P/SK CLR/RM FG
```
Report
a routine report filed through TLH
Where
over TLH
Time
11:04 UTC
Height
at 1,000 ft
Aircraft
E55P
Sky
clear
Remarks
fog
E170 at 2,000 ft, 32 nm southwest, 6:05 am EDT (10:05 UTC): clear, remarks: ground fog. 385 nm along the route, 32 nm southwest of the line.
as filed, and in English
```
TLH UA /OV TLH/TM 1005/FL20/TP E170/SK CLR/RM GROUND FOG
```
Report
a routine report filed through TLH
Where
over TLH
Time
10:05 UTC
Height
at 2,000 ft
Aircraft
E170
Sky
clear
Remarks
ground fog
C56X at 1,000 ft, 39 nm northeast, 7:04 am EDT (11:04 UTC): remarks: during the climb runway 20 departure. 652 nm along the route, 39 nm northeast of the line.
as filed, and in English
```
CHA UA /OV CHA/TM 1104/FL010/TP C56X/SK TOP010/RM DURC. RY 20 DEPARTURE
```
Report
a routine report filed through CHA
Where
over CHA
Time
11:04 UTC
Height
at 1,000 ft
Aircraft
C56X
Sky
TOP010
Remarks
during the climb runway 20 departure
CRJ9 at 1,000 ft, 39 nm northeast, 6:15 am EDT (10:15 UTC): remarks: during the climb runway 20 departure. 652 nm along the route, 39 nm northeast of the line.
as filed, and in English
```
CHA UA /OV CHA/TM 1015/FL010/TP CRJ9/SK TOP010/RM DURC. RY 20 DEPARTURE
```
Report
a routine report filed through CHA
Where
over CHA
Time
10:15 UTC
Height
at 1,000 ft
Aircraft
CRJ9
Sky
TOP010
Remarks
during the climb runway 20 departure
E75L at 33,000 ft, 37 nm east, 7:09 am EDT (11:09 UTC): no turbulence, remarks: ZME62. At the destination end, 37 nm east of the line.
as filed, and in English
```
BNA UA /OV BNA045040/TM 1109/FL330/TP E75L/TB NEG/RM ZME62
```
Report
a routine report filed through BNA
Where
40 nm northeast (045°) of BNA
Time
11:09 UTC
Height
at 33,000 ft
Aircraft
E75L
Turbulence
none
Remarks
ZME62

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 8 forecast points nearest it (EYW, MIA, PIE, TLH, CSG, ATL, HSV, BNA). 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	330° at 16 kt	+16 kt		104 kt	7 h 25 min	1:51 pm CDT (18:51 UTC)
6,500 ft	340° at 16 kt	+16 kt	16 °C	104 kt	7 h 25 min	1:51 pm CDT (18:51 UTC)
8,500 ft	340° at 15 kt	+15 kt	12 °C	105 kt	7 h 21 min	1:47 pm CDT (18:47 UTC)
10,500 ft	330° at 13 kt	+13 kt	9 °C	107 kt	7 h 12 min	1:38 pm CDT (18:38 UTC)
12,500 ft	310° at 12 kt	+11 kt	5 °C	109 kt	7 h 04 min	1:30 pm CDT (18:30 UTC)
14,500 ft	310° at 14 kt	+13 kt	1 °C	107 kt	7 h 12 min	1:38 pm CDT (18:38 UTC)
16,500 ft	310° at 16 kt	+14 kt	-3 °C	106 kt	7 h 16 min	1:42 pm CDT (18:42 UTC)
18,000 ft FL180	310° at 18 kt	+15 kt	-6 °C	105 kt	7 h 21 min	1:47 pm CDT (18:47 UTC)
24,000 ft FL240	320° at 20 kt	+19 kt	-17 °C	101 kt	7 h 38 min	2:04 pm CDT (19:04 UTC)
30,000 ft FL300	320° at 28 kt	+26 kt	-32 °C	94 kt	8 h 12 min	2:38 pm CDT (19:38 UTC)
34,000 ft FL340	320° at 31 kt	+29 kt	-41 °C	91 kt	8 h 28 min	2:54 pm CDT (19:54 UTC)
39,000 ft FL390	320° at 24 kt	+23 kt	-51 °C	97 kt	7 h 57 min	2:23 pm CDT (19:23 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
EYW	used from 0 nm out; 44 nm from the line	080/9	050/5 18°	070/5 13°	060/6 9°	L/V -6°	280/11 -17°	260/18 -32°	250/21 -41°	260/21 -52°
MIA	used from 49 nm out; 69 nm from the line	L/V	L/V 17°	L/V 13°	L/V 8°	270/6 -6°	250/9 -17°	290/17 -32°	280/25 -41°	280/21 -52°
PIE	used from 99 nm out; 87 nm from the line	360/10	340/12 18°	330/9 13°	290/12 8°	260/21 -7°	280/18 -18°	250/20 -33°	250/26 -41°	250/20 -51°
TLH	used from 296 nm out; 69 nm from the line	340/23	350/26 17°	350/21 11°	300/13 6°	320/25 -6°	340/35 -16°	350/44 -32°	360/51 -42°	350/33 -52°
CSG	used from 445 nm out; 42 nm from the line	330/27	340/28 16°	350/28 11°	330/17 6°	340/25 -6°	350/33 -18°	330/46 -32°	340/45 -41°	350/31 -52°
ATL	used from 543 nm out; 42 nm from the line	330/32	340/36 17°	350/34 10°	340/25 6°	330/27 -6°	350/35 -18°	330/49 -32°	340/47 -41°	340/27 -51°
HSV	used from 593 nm out; 62 nm from the line	300/20	310/14 16°	310/18 10°	310/15 4°	320/19 -5°	290/16 -18°	320/36 -32°	320/47 -41°	330/42 -50°
BNA	used from 692 nm out; 27 nm from the line	300/20	300/14 15°	300/14 10°	300/13 4°	310/22 -5°	280/24 -18°	310/37 -33°	310/50 -41°	320/49 -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
MTH Marathon, FL	departure	VFR Sky: a few clouds at 2,700 feet, a few clouds at 8,000 feet	from the northeast (050°) at 6 knots	10+ mi	none	7 ft	6:53 am EDT (10:53 UTC)
FMY Fort Myers, FL	119 nm out, 2 nm north of the line, tower	VFR Sky: scattered clouds at 1,500 feet	from the north-northeast (030°) at 7 knots	10+ mi	none	17 ft	11:21 UTC
TPA Tampa, FL	208 nm out, 3 nm northwest of the line, tower	VFR Sky: a few clouds at 18,000 feet, scattered clouds at 25,000 feet	from the north (360°) at 5 knots	10+ mi	none	26 ft	10:53 UTC
BKV Brooksville, FL	237 nm out, 14 nm east of the line, tower	VFR	from the north (350°) at 3 knots	8 mi	none	76 ft	10:53 UTC
FPY Perry, FL	346 nm out, 4 nm west of the line	low IFR Sky: overcast at 300 feet Weather: mist	calm	0.75 mi	300 ft	44 ft	11:15 UTC
ABY Albany, GA	445 nm out, 4 nm southeast of the line, tower	VFR	from the west (280°) at 6 knots	10+ mi	none	196 ft	22:53 UTC
CSG Columbus, GA	514 nm out, 10 nm southwest of the line, tower	VFR	calm	10+ mi	none	397 ft	10:51 UTC
PYP Centre, AL	613 nm out, 3 nm south of the line	no report just now				594 ft
THA Tullahoma, TN	692 nm out, 2 nm north of the line	marginal VFR Weather: mist	calm	3 mi	none	1,084 ft	11:15 UTC
BNA Nashville, TN	741 nm out, 2 nm north of the line, tower	VFR	calm	9 mi	none	599 ft	10:53 UTC
M91 Springfield, TN	destination	no report just now				706 ft

The highest airport on this list sits at 1,084 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At M91 when you get there the forecast at the estimated arrival, 1:30 pm CDT (18:30 UTC)

M91 has no terminal forecast; use the nearest airport that does.

The forecast for MTH, the departure

From Mon 8:00 am EDT (12:00 UTC): wind from the east-northeast at 5 knots, visibility more than 6 miles, a few clouds at 2,000 feet
From Mon 10:00 pm EDT (02:00 UTC): wind from the northeast at 6 knots, visibility more than 6 miles, showers nearby, scattered clouds at 2,000 feet

Temporary flight restrictions on the line or within 25 nm of it

6/0708 Goodlettsville, TN, Saturday, August 1, 2026 through Sunday, August 1, 2027 UTC 6 nm from the route, at the destination end · security · until 1 August · ZME

Daylight

Sunset at MTH 7:00 pm EDT (23:00 UTC), at M91 6:15 pm CDT (23:15 UTC) (civil twilight ends 6:41 pm CDT (23:41 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 Southeast · loop National Weather Service

Radar now, the lower Mississippi valley · 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: The Florida Keys Marathon International, Springfield Robertson County.