Plan a flight · Mon 8:10 am MDT (14:10 UTC)

Missoula Montana Airport to Tweed/New Haven Airport MSO → HVN

1,788 nautical miles (2,057 statute miles) east on a straight line, true course 086°, about 073° magnetic at the departure end (variation 13E). At 120 knots that is 10 h 20 min at the quickest height in today's winds (39,000 ft, a 53-knot tailwind), arriving about 8:30 pm EDT (00:30 UTC), after sunset at the destination. Right now MSO is VFR, wind from the north (350°) at 3 knots; HVN is VFR, wind from the north (350°) at 9 knots, gusting to 19. 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

SIGMET C20C: thunderstorms (a convective SIGMET) up to 37,000 ft, moving from the southwest at 40 knots, until 9:55 am MDT (15:55 UTC). Over the route from 579 to 649 nm out.
as issued
```
WSUS32 KKCI 121355
MKCC WST 121355
CONVECTIVE SIGMET 20C
VALID UNTIL 1555Z
SD ND
FROM 80W GFK-40WNW FAR-40W ABR-50ENE DPR-30S BIS-80W GFK
AREA TS MOV FROM 21040KT. TOPS TO FL370.
```
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the first 320 nm of the route.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 10 nm of the route.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the first 210 nm of the route.
AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 40 to 889 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 330 to 639 nm out.
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 route from 1488 to 1658 nm out.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 1568 to 1718 nm out.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 40,000 ft. Over the last 60 nm of 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 20 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 MSO.

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

A321 at 35,000 ft, 50 nm north, 5:16 am MDT (11:16 UTC): moderate chop turbulence above 35,000 ft. 1588 nm along the route, 50 nm north of the line.
as filed, and in English
```
SYR UA /OV SYR320020/TM 1116/FL350/TP A321/TB OCNL MOD CHOP 350
```
Report
a routine report filed through SYR
Where
20 nm northwest (320°) of SYR
Time
11:16 UTC
Height
at 35,000 ft
Aircraft
A321
Turbulence
occasional moderate chop at 35,000 ft
E75L at 33,000 ft, 40 nm northeast, 7:25 am MDT (13:25 UTC): moderate turbulence. 1618 nm along the route, 40 nm northeast of the line.
as filed, and in English
```
SYR UA /OV SYR140015/TM 1325/FL330/TP E75L/TB CONS MOD 350 CONS LGT 330
```
Report
a routine report filed through SYR
Where
15 nm southeast (140°) of SYR
Time
13:25 UTC
Height
at 33,000 ft
Aircraft
E75L
Turbulence
continuous moderate at 35,000 ft continuous light at 33,000 ft
CL30 at 34,000 ft, 29 nm northeast, 7:56 am MDT (13:56 UTC): moderate turbulence. 1668 nm along the route, 29 nm northeast of the line.
as filed, and in English
```
OIC UA /OV N66/TM 1356/FL340/TP CL30/TB MOD
```
Report
a routine report filed through OIC
Where
over N66
Time
13:56 UTC
Height
at 34,000 ft
Aircraft
CL30
Turbulence
moderate
BE9L at 7,500 ft, 31 nm south, 6:45 am MDT (12:45 UTC): no turbulence, light rime icing, overcast from 7,500 ft to 9,000 ft, -6 °C, remarks: during the climb. 90 nm along the route, 31 nm south of the line.
as filed, and in English
```
HLN UA /OV HLN120010/TM 1245/FL075/TP BE9L/SK OVC075-TOPS090/TA M06/TB NEG/IC LGT RIME/RM DURC
```
Report
a routine report filed through HLN
Where
10 nm southeast (120°) of HLN
Time
12:45 UTC
Height
at 7,500 ft
Aircraft
BE9L
Sky
overcast from 7,500 ft, tops 9,000 ft
Temperature
−6 °C
Turbulence
none
Icing
light rime
Remarks
during the climb
B752 at 41,000 ft, 15 nm south, 6:31 am MDT (12:31 UTC): light to moderate turbulence above 41,000 ft. 90 nm along the route, 15 nm south of the line.
as filed, and in English
```
HLN UA /OV HLN009010/TM 1231/FL410/TP B752/TB CONS LGT OCNL MOD 410/ZLC
```
Report
a routine report filed through HLN
Where
10 nm north (009°) of HLN
Time
12:31 UTC
Height
at 41,000 ft
Aircraft
B752
Turbulence
continuous light occasional moderate 410/ZLC
A319 at 7,500 ft, 26 nm north, 7:41 am MDT (13:41 UTC): overcast from 30,000 ft to 7,500 ft. 110 nm along the route, 26 nm north of the line.
as filed, and in English
```
GTF UA /OV 180010/TM 1341/FL075/TP A319/SK OVC003-TOPS075
```
Report
a routine report filed through GTF
Where
wind from 180° at 10 knots
Time
13:41 UTC
Height
at 7,500 ft
Aircraft
A319
Sky
overcast from 300 ft, tops 7,500 ft
CRJ7 at 29,500 ft, 5 nm west, 6:45 am MDT (12:45 UTC): light chop turbulence. 439 nm along the route, 5 nm west of the line.
as filed, and in English
```
DIK UA /OV DIK270030/TM 1245/FL295/TP CRJ7/SK TOP 295/TB LGT CHOP/ZLC
```
Report
a routine report filed through DIK
Where
30 nm west (270°) of DIK
Time
12:45 UTC
Height
at 29,500 ft
Aircraft
CRJ7
Sky
top 29,500 ft
Turbulence
light chop/zlc
C525 at 3,500 ft, 4 nm south, 7:43 am MDT (13:43 UTC): a trace of rime icing, 3 °C, remarks: during the descent. 549 nm along the route, 4 nm south of the line.
as filed, and in English
```
BIS UA /OV BIS/TM 1343/FL035/TP C525/SK BASES 020 TOPS 055/TA 03/IC TR RIME/RM DURD
```
Report
a routine report filed through BIS
Where
over BIS
Time
13:43 UTC
Height
at 3,500 ft
Aircraft
C525
Sky
bases 2,000 ft tops 5,500 ft
Temperature
3 °C
Icing
tr rime
Remarks
during the descent
SR22 at 7,000 ft, 34 nm south, 7:37 am MDT (13:37 UTC): no turbulence, no icing, clear from 7,000 ft to 60,000 ft. 549 nm along the route, 34 nm south of the line.
as filed, and in English
```
BIS UA /OV BIS170030/TM 1337/FL070/TP SR22/SK SKC/TB NEG/IC NEG
```
Report
a routine report filed through BIS
Where
30 nm south (170°) of BIS
Time
13:37 UTC
Height
at 7,000 ft
Aircraft
SR22
Sky
clear
Turbulence
none
Icing
none
PA46 at 7,000 ft, 4 nm south, 7:11 am MDT (13:11 UTC): remarks: during the climb. 549 nm along the route, 4 nm south of the line.
as filed, and in English
```
BIS UA /OV BIS/TM 1311/FL070/TP PA46/SK TOPS 062/RM DURC
```
Report
a routine report filed through BIS
Where
over BIS
Time
13:11 UTC
Height
at 7,000 ft
Aircraft
PA46
Sky
tops 6,200 ft
Remarks
during the climb
P46T descending, 4 nm southwest, 6:41 am MDT (12:41 UTC): overcast from 2,000 ft to 5,600 ft. 549 nm along the route, 4 nm southwest of the line.
as filed, and in English
```
BIS UA /OV KBIS/TM 1241/FLDURD/TP P46T/SK OVC020-TOP056
```
Report
a routine report filed through BIS
Where
over KBIS
Time
12:41 UTC
Height
during the descent
Aircraft
P46T
Sky
overcast from 2,000 ft, tops 5,600 ft
PC12 at 3,500 ft, 25 nm north, 7:39 am MDT (13:39 UTC): overcast from 1,200 ft to 3,500 ft, 10 °C. 699 nm along the route, 25 nm north of the line.
as filed, and in English
```
FAR UA /OV KFAR270005/TM 1339/FL035/TP PC12/SK OVC012-TOP035/TA 10
```
Report
a routine report filed through FAR
Where
5 nm west (270°) of KFAR
Time
13:39 UTC
Height
at 3,500 ft
Aircraft
PC12
Sky
overcast from 1,200 ft, tops 3,500 ft
Temperature
10 °C
TBM8 at 2,700 ft, 25 nm north, 7:03 am MDT (13:03 UTC): overcast from 1,300 ft to 2,700 ft. 709 nm along the route, 25 nm north of the line.
as filed, and in English
```
FAR UA /OV KFAR/TM 1303/FL027/TP TBM8/SK OVC013-TOP027
```
Report
a routine report filed through FAR
Where
over KFAR
Time
13:03 UTC
Height
at 2,700 ft
Aircraft
TBM8
Sky
overcast from 1,300 ft, tops 2,700 ft
M600 at 2,800 ft, 25 nm north, 6:36 am MDT (12:36 UTC): overcast up to 2,800 ft. 709 nm along the route, 25 nm north of the line.
as filed, and in English
```
FAR UA /OV KFAR270002/TM 1236/FL028/TP M600/SK OVCUNKN-TOP028
```
Report
a routine report filed through FAR
Where
2 nm west (270°) of KFAR
Time
12:36 UTC
Height
at 2,800 ft
Aircraft
M600
Sky
overcast, tops 2,800 ft

16 more routine reports are on the map.

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 16 forecast points nearest it (GPI, GTF, BIL, MLS, DIK, MOT, ABR, AXN, DLH, GRB, TVC, BUF, SYR, AVP, ALB, BDL). 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	280° at 7 kt	−7 kt		127 kt	14 h 05 min	12:15 am EDT (04:15 UTC)
5,500 ft	280° at 11 kt	−11 kt	-1 °C	131 kt	13 h 39 min	11:49 pm EDT (03:49 UTC)
7,500 ft	270° at 14 kt	−14 kt	9 °C	134 kt	13 h 21 min	11:31 pm EDT (03:31 UTC)
9,500 ft	270° at 17 kt	−17 kt	6 °C	137 kt	13 h 03 min	11:13 pm EDT (03:13 UTC)
11,500 ft	270° at 18 kt	−19 kt	3 °C	139 kt	12 h 52 min	11:02 pm EDT (03:02 UTC)
13,500 ft	270° at 20 kt	−21 kt	-1 °C	141 kt	12 h 41 min	10:51 pm EDT (02:51 UTC)
15,500 ft	260° at 22 kt	−23 kt	-6 °C	143 kt	12 h 30 min	10:40 pm EDT (02:40 UTC)
17,500 ft	260° at 24 kt	−25 kt	-10 °C	145 kt	12 h 20 min	10:30 pm EDT (02:30 UTC)
18,000 ft FL180	260° at 25 kt	−25 kt	-11 °C	145 kt	12 h 20 min	10:30 pm EDT (02:30 UTC)
24,000 ft FL240	260° at 29 kt	−29 kt	-23 °C	149 kt	12 h	10:10 pm EDT (02:10 UTC)
30,000 ft FL300	260° at 36 kt	−36 kt	-36 °C	156 kt	11 h 28 min	9:38 pm EDT (01:38 UTC)
34,000 ft FL340	260° at 42 kt	−43 kt	-41 °C	163 kt	10 h 58 min	9:08 pm EDT (01:08 UTC)
39,000 ft FL390	270° at 49 kt	−53 kt	-47 °C	173 kt	10 h 20 min	8:30 pm EDT (00:30 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
GPI	used from 0 nm out; 88 nm from the line		L/V -3°	L/V -4°	L/V -6°	210/19 -17°	220/26 -32°	190/23 -40°	220/25 -39°	220/34 -42°
GTF	used from 50 nm out; 47 nm from the line		L/V	L/V -4°	230/12 -3°	210/12 -17°	190/23 -29°	200/48 -39°	210/69 -39°	220/66 -42°
BIL	used from 200 nm out; 76 nm from the line		L/V	250/11 -1°	240/20 -2°	230/28 -15°	220/28 -28°	220/53 -34°	220/55 -39°	220/63 -44°
MLS	used from 250 nm out; 73 nm from the line		320/9 -2°	270/14 0°	260/22 -1°	220/30 -14°	210/43 -26°	230/53 -34°	230/54 -38°	230/59 -44°
DIK	used from 399 nm out; 39 nm from the line		330/11 1°	230/20 4°	220/22 0°	230/29 -12°	240/27 -25°	240/40 -34°	230/49 -37°	240/55 -44°
MOT	used from 549 nm out; 101 nm from the line		L/V 2°	220/12 2°	220/27 0°	220/36 -12°	230/33 -24°	230/39 -34°	230/50 -39°	250/63 -46°
ABR	used from 599 nm out; 77 nm from the line	020/9	230/5 12°	190/14 11°	200/25 5°	230/37 -11°	230/50 -23°	240/39 -34°	240/49 -38°	240/55 -46°
AXN	used from 699 nm out; 58 nm from the line	110/18	200/12 17°	220/22 12°	230/26 4°	240/31 -10°	240/45 -21°	240/38 -36°	250/49 -38°	260/56 -47°
DLH	used from 849 nm out; 57 nm from the line	090/34	210/13 14°	240/14 11°	250/20 4°	250/38 -10°	260/39 -22°	250/41 -37°	270/53 -41°	280/68 -48°
GRB	used from 999 nm out; 83 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 1148 nm out; 20 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°
BUF	used from 1348 nm out; 136 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°
SYR	used from 1548 nm out; 58 nm from the line	290/24	310/27 13°	310/34 8°	320/32 2°	300/32 -10°	300/40 -21°	300/45 -37°	310/58 -47°	310/64 -54°
AVP	used from 1648 nm out; 48 nm from the line	330/21	340/24 14°	350/27 9°	350/25 3°	330/29 -8°	310/31 -20°	330/41 -36°	330/57 -46°	320/55 -51°
ALB	used from 1698 nm out; 65 nm from the line	310/19	330/25 12°	330/29 8°	330/29 3°	320/34 -10°	310/42 -21°	320/43 -37°	330/55 -47°	320/52 -54°
BDL	used from 1748 nm out; 42 nm from the line	330/20	340/23 12°	340/25 8°	340/27 3°	330/30 -9°	330/39 -21°	340/48 -37°	340/53 -46°	320/33 -55°

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
MSO Missoula, MT	departure	VFR Sky: overcast at 6,500 feet	from the north (350°) at 3 knots	10+ mi	6,500 ft	3,205 ft	7:53 am MDT (13:53 UTC)
HLN Helena, MT	90 nm out, 24 nm south of the line, tower	marginal VFR Sky: a broken layer at 2,000 feet, overcast at 4,300 feet	from the west (270°) at 6 knots	10+ mi	2,000 ft	3,877 ft	13:53 UTC
LWT Lewistown, MT	190 nm out, 1 nm south of the line	no report just now				4,170 ft
GDV Glendive, MT	379 nm out, 7 nm north of the line	low IFR Sky: overcast at 400 feet Weather: light rain	from the northeast (040°) at 7 knots	10+ mi	400 ft	2,458 ft	13:56 UTC
BIS Bismarck, ND	549 nm out, 4 nm southwest of the line, tower	marginal VFR Sky: scattered clouds at 600 feet, overcast at 1,100 feet Weather: mist	from the north (360°) at 7 knots	4 mi	1,100 ft	1,661 ft	13:52 UTC
SAZ Staples, MN	789 nm out, 7 nm northeast of the line	marginal VFR Sky: a broken layer at 1,100 feet	from the east-northeast (060°) at 9 knots	9 mi	1,100 ft	1,287 ft	13:55 UTC
PBH Phillips, WI	979 nm out, 4 nm northeast of the line	VFR	from the north (360°) at 4 knots	10+ mi	none	1,497 ft	13:55 UTC
GOV Grayling, MI	1228 nm out, 5 nm northeast of the line, tower	VFR Sky: a broken layer at 20,000 feet Weather: mist	calm	6 mi	20,000 ft	1,158 ft	13:55 UTC
OSC Oscoda, MI	1288 nm out, 9 nm north of the line	VFR	from the southwest (220°) at 8 knots	10+ mi	none	633 ft	13:55 UTC
IAG Niagara Falls, NY	1498 nm out, 4 nm southwest of the line, tower	IFR Sky: a broken layer at 800 feet, overcast at 1,400 feet	from the southwest (230°) at 8 knots	8 mi	800 ft	592 ft	13:53 UTC
POU Poughkeepsie, NY	1738 nm out, 1 nm northeast of the line, tower	IFR Sky: overcast at 600 feet	from the northwest (320°) at 5 knots	10+ mi	600 ft	163 ft	14:06 UTC
HVN New Haven, CT	destination	VFR Sky: scattered clouds at 2,700 feet, a broken layer at 3,400 feet	from the north (350°) at 9 knots, gusting to 19	10+ mi	3,400 ft	12 ft	9:53 am EDT (13:53 UTC)

The highest airport on this list sits at 4,170 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At HVN when you get there the forecast at the estimated arrival, 8:30 pm EDT (00:30 UTC)

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

The forecast for MSO, the departure

From Mon 6:00 am MDT (12:00 UTC): wind from the east at 2 knots, visibility more than 6 miles, showers nearby, scattered clouds at 1,500 feet, a broken layer at 4,000 feet
From Mon 8:00 am MDT (14:00 UTC): wind from the east-southeast at 4 knots, visibility more than 6 miles, overcast at 5,000 feet
From Mon 2:00 pm MDT (20:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, overcast at 10,000 feet

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

6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, at the departure end · a VIP movement · starts Wednesday 14 October · ZSE
6/8923 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, at the departure end · a VIP movement · starts Wednesday 14 October · ZLC

Daylight

Sunset at MSO 6:53 pm MDT (00:53 UTC), at HVN 6:15 pm EDT (22:15 UTC) (civil twilight ends 6:43 pm EDT (22:43 UTC)). At 120 knots the arrival at HVN is after sunset there (6:15 pm EDT (22:15 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 northern Rockies · loop National Weather Service

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: Missoula Montana Airport, Tweed/New Haven Airport.