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 12 min at the quickest height in today's winds (16,500 ft, a 13-knot headwind), arriving about 7:53 am CDT (12:53 UTC). Right now MTH is VFR, wind from the east-northeast (070°) 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: 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 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 148 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
- B738 at 37,000 ft, 25 nm west, 12:27 am EDT (04:27 UTC): light chop turbulence. 415 nm along the route, 25 nm west of the line.
as filed, and in English
TLH UA /OV TLH353039/TM 0427/FL370/TP B738/TB OCNL LGT CHOP
- Report
- a routine report filed through TLH
- Where
- 39 nm north (353°) of TLH
- Time
- 04:27 UTC
- Height
- at 37,000 ft
- Aircraft
- B738
- Turbulence
- occasional light chop
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 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 15 kt | +15 kt | 105 kt | 7 h 21 min | 8:02 am CDT (13:02 UTC) | |
| 6,500 ft | 340° at 17 kt | +17 kt | 16 °C | 103 kt | 7 h 29 min | 8:10 am CDT (13:10 UTC) |
| 8,500 ft | 330° at 18 kt | +18 kt | 13 °C | 102 kt | 7 h 34 min | 8:15 am CDT (13:15 UTC) |
| 10,500 ft | 330° at 17 kt | +16 kt | 10 °C | 104 kt | 7 h 25 min | 8:06 am CDT (13:06 UTC) |
| 12,500 ft | 320° at 15 kt | +14 kt | 7 °C | 106 kt | 7 h 16 min | 7:57 am CDT (12:57 UTC) |
| 14,500 ft | 310° at 16 kt | +14 kt | 2 °C | 106 kt | 7 h 16 min | 7:57 am CDT (12:57 UTC) |
| 16,500 ft | 300° at 17 kt | +13 kt | -3 °C | 107 kt | 7 h 12 min | 7:53 am CDT (12:53 UTC) |
| 18,000 ft FL180 | 290° at 18 kt | +13 kt | -6 °C | 107 kt | 7 h 12 min | 7:53 am CDT (12:53 UTC) |
| 24,000 ft FL240 | 300° at 21 kt | +15 kt | -17 °C | 105 kt | 7 h 21 min | 8:02 am CDT (13:02 UTC) |
| 30,000 ft FL300 | 310° at 29 kt | +26 kt | -32 °C | 94 kt | 8 h 12 min | 8:53 am CDT (13:53 UTC) |
| 34,000 ft FL340 | 310° at 27 kt | +24 kt | -41 °C | 96 kt | 8 h 02 min | 8:43 am CDT (13:43 UTC) |
| 39,000 ft FL390 | 300° at 19 kt | +16 kt | -51 °C | 104 kt | 7 h 25 min | 8:06 am CDT (13:06 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| EYW | used from 0 nm out; 44 nm from the line | 110/11 | 110/10 17° | 110/7 14° | 080/6 9° | L/V -5° | 260/7 -16° | 280/12 -32° | 300/16 -42° | 270/12 -52° |
| MIA | used from 49 nm out; 69 nm from the line | 150/7 | 140/5 17° | 160/5 14° | L/V 9° | 230/8 -5° | 230/8 -17° | 150/11 -32° | 150/25 -41° | 180/29 -51° |
| PIE | used from 99 nm out; 87 nm from the line | 350/6 | L/V 18° | 290/6 14° | 280/9 9° | 250/18 -6° | 250/23 -17° | 240/30 -31° | 220/31 -41° | 220/30 -52° |
| TLH | used from 296 nm out; 69 nm from the line | 320/18 | 350/31 18° | 340/24 13° | 310/17 8° | 280/22 -7° | 300/25 -17° | 320/28 -33° | 320/24 -41° | 320/25 -50° |
| CSG | used from 445 nm out; 42 nm from the line | 310/24 | 340/35 17° | 340/37 12° | 330/22 8° | 310/30 -7° | 290/30 -18° | 340/57 -32° | 340/55 -41° | 320/33 -49° |
| ATL | used from 543 nm out; 42 nm from the line | 320/30 | 330/37 16° | 340/44 11° | 330/35 7° | 310/33 -6° | 300/38 -18° | 330/58 -33° | 330/48 -40° | 320/34 -49° |
| HSV | used from 593 nm out; 62 nm from the line | 310/20 | 330/20 16° | 320/27 11° | 340/23 5° | 320/23 -7° | 340/30 -17° | 320/50 -33° | 330/61 -41° | 340/41 -50° |
| BNA | used from 692 nm out; 27 nm from the line | 310/20 | 340/20 17° | 330/24 10° | 340/22 5° | 330/26 -6° | 340/29 -18° | 330/52 -33° | 320/62 -41° | 340/45 -50° |
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 2,000 feet | from the east-northeast (070°) at 4 knots | 10+ mi | none | 7 ft | 12:53 am EDT (04:53 UTC) |
| FMY Fort Myers, FL | 119 nm out, 2 nm north of the line, tower | VFR | from the southeast (130°) at 3 knots | 10+ mi | none | 17 ft | 04:53 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 | calm | 10+ mi | none | 26 ft | 04:53 UTC |
| BKV Brooksville, FL | 237 nm out, 14 nm east of the line, tower | low IFR Weather: fog | calm | 0.5 mi | none | 76 ft | 05:35 UTC |
| FPY Perry, FL | 346 nm out, 4 nm west of the line | VFR | calm | 10+ mi | none | 44 ft | 05:35 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 | 04:51 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 | low IFR Sky: overcast at 200 feet Weather: fog | calm | 0.25 mi | 200 ft | 1,084 ft | 05:15 UTC |
| BNA Nashville, TN | 741 nm out, 2 nm north of the line, tower | VFR | from the south (180°) at 4 knots | 7 mi | none | 599 ft | 04:53 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, 7:53 am CDT (12:53 UTC)
M91 has no terminal forecast; use the nearest airport that does.
The forecast for MTH, the departure
- From Mon 2:00 am EDT (06:00 UTC): wind from the east-northeast at 5 knots, visibility more than 6 miles, a few 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
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.