Missoula Montana Airport to Helena Regional MSO → HLN
89 nautical miles (102 statute miles) east on a straight line, true course 101°, about 088° magnetic at the departure end (variation 13E). At 120 knots that is 34 min at the quickest height in today's winds (34,000 ft, a 37-knot tailwind), arriving about 8:46 pm MDT (02:46 UTC), after sunset at the destination. Right now MSO is marginal VFR, wind calm; HLN is IFR, wind from the west (280°) at 8 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: 4 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 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the whole route.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the whole route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the whole route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the whole 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
- E75L at 14,000 ft, 23 nm south, 5:22 pm MDT (23:22 UTC): moderate turbulence from 14,000 ft to 21,000 ft, remarks: during the climb zlc. 10 nm along the route, 23 nm south of the line.
as filed, and in English
MSO UA /OV 32S/TM 2322/FL140/TP E75L/TB MOD 140-210/RM DURC /ZLC
- Report
- a routine report filed through MSO
- Where
- over 32S
- Time
- 23:22 UTC
- Height
- at 14,000 ft
- Aircraft
- E75L
- Turbulence
- moderate from 14,000 ft to 21,000 ft
- Remarks
- during the climb zlc
- BCS1 at 3,700 ft, 1 nm southeast, 7:47 pm MDT (01:47 UTC): snow, rain, remarks: during the descent ils runway 12. At the departure end, 1 nm southeast of the line.
as filed, and in English
MSO UA /OV MSO/TM 0147/FL037/TP BCS1/SK 037/WX SN RA/RM DURD ILS RY 12
- Report
- a routine report filed through MSO
- Where
- over MSO
- Time
- 01:47 UTC
- Height
- at 3,700 ft
- Aircraft
- BCS1
- Sky
- at 3,700 ft
- Weather
- snow, rain
- Remarks
- during the descent ils runway 12
- C25B at 4,100 ft, 1 nm southeast, 6:36 pm MDT (00:36 UTC): no icing, overcast above 4,100 ft, remarks: during the descent ils runway 12. At the departure end, 1 nm southeast of the line.
as filed, and in English
MSO UA /OV MSO/TM 0036/FL041/TP C25B/SK OVC041/IC NEG/RM DURD ILS RY 12
- Report
- a routine report filed through MSO
- Where
- over MSO
- Time
- 00:36 UTC
- Height
- at 4,100 ft
- Aircraft
- C25B
- Sky
- overcast from 4,100 ft
- Icing
- none
- Remarks
- during the descent ils runway 12
- B738 at 24,000 ft, 41 nm south, 5:13 pm MDT (23:13 UTC): remarks: snow top flight level at 24,000 ft zlc. At the destination end, 41 nm south of the line.
as filed, and in English
BZN UA /OV BZN270030/TM 2313/FL240/TP B738/RM SN TOP FL 240 /ZLC
- Report
- a routine report filed through BZN
- Where
- 30 nm west (270°) of BZN
- Time
- 23:13 UTC
- Height
- at 24,000 ft
- Aircraft
- B738
- Remarks
- snow top flight level at 24,000 ft zlc
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 2 forecast points nearest it (GPI, GTF). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 5,500 ft | 060° at 20 kt | +16 kt | -3 °C | 104 kt | 51 min | 9:03 pm MDT (03:03 UTC) |
| 7,500 ft | 080° at 16 kt | +15 kt | -6 °C | 105 kt | 51 min | 9:03 pm MDT (03:03 UTC) |
| 9,500 ft | 100° at 12 kt | +12 kt | -7 °C | 108 kt | 49 min | 9:01 pm MDT (03:01 UTC) |
| 11,500 ft | 120° at 7 kt | +6 kt | -7 °C | 114 kt | 47 min | 8:59 pm MDT (02:59 UTC) |
| 13,500 ft | 170° at 11 kt | +4 kt | -9 °C | 116 kt | 46 min | 8:58 pm MDT (02:58 UTC) |
| 15,500 ft | 190° at 21 kt | +2 kt | -12 °C | 118 kt | 45 min | 8:57 pm MDT (02:57 UTC) |
| 17,500 ft | 190° at 32 kt | 0 | -16 °C | 120 kt | 44 min | 8:56 pm MDT (02:56 UTC) |
| 18,000 ft FL180 | 190° at 35 kt | −1 kt | -17 °C | 121 kt | 44 min | 8:56 pm MDT (02:56 UTC) |
| 24,000 ft FL240 | 190° at 56 kt | −2 kt | -26 °C | 122 kt | 44 min | 8:56 pm MDT (02:56 UTC) |
| 30,000 ft FL300 | 200° at 91 kt | −19 kt | -39 °C | 139 kt | 38 min | 8:50 pm MDT (02:50 UTC) |
| 34,000 ft FL340 | 220° at 77 kt | −37 kt | -43 °C | 157 kt | 34 min | 8:46 pm MDT (02:46 UTC) |
| 39,000 ft FL390 | 230° at 53 kt | −33 kt | -44 °C | 153 kt | 35 min | 8:47 pm MDT (02:47 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| GPI | used from 0 nm out; 94 nm from the line | 060/19 -3° | 110/11 -8° | 130/6 -8° | 200/40 -19° | 190/58 -28° | 200/101 -39° | 220/73 -43° | 230/41 -43° | |
| GTF | used from 49 nm out; 65 nm from the line | 070/21 | 080/18 -6° | 120/5 -5° | 180/30 -14° | 200/53 -24° | 210/80 -38° | 220/83 -44° | 230/68 -46° |
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 | marginal VFR Sky: overcast at 2,300 feet Weather: light snow, mist | calm | 6 mi | 2,300 ft | 3,205 ft | 7:53 pm MDT (01:53 UTC) |
| HLN Helena, MT | destination | IFR Sky: scattered clouds at 700 feet, overcast at 1,400 feet Weather: light snow, mist | from the west (280°) at 8 knots | 1.25 mi | 1,400 ft | 3,877 ft | 7:53 pm MDT (01:53 UTC) |
The highest airport on this list sits at 3,877 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At HLN when you get there the forecast at the estimated arrival, 8:46 pm MDT (02:46 UTC)
Wind from the north-northwest at 12 knots, gusting to 24, visibility ¾ mile, light snow, mist, scattered clouds at 800 feet, overcast at 1,600 feet low IFR
The whole forecast for HLN
- From Sun 6:00 pm MDT (00:00 UTC): wind from the north-northwest at 12 knots, gusting to 24, visibility ¾ mile, light snow, mist, scattered clouds at 800 feet, overcast at 1,600 feet
- From Mon 12:00 am MDT (06:00 UTC): wind from the northwest at 14 knots, gusting to 30, visibility 1½ miles, light snow, mist, scattered clouds at 800 feet, overcast at 1,500 feet
- From Mon 4:00 am MDT (10:00 UTC): wind from the west-northwest at 10 knots, visibility 3 miles, light snow, mist, scattered clouds at 1,000 feet, overcast at 2,500 feet
- From Mon 7:00 am MDT (13:00 UTC): wind light and variable, visibility more than 6 miles, overcast at 2,500 feet
- From Mon 1:00 pm MDT (19:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 3,500 feet
The forecast for MSO, the departure
- From Sun 6:00 pm MDT (00:00 UTC): wind from the south-southeast at 5 knots, visibility 6 miles, light rain, overcast at 2,500 feet
- At times between Sun 7:00 pm MDT (01:00 UTC) and 11:00 pm MDT (05:00 UTC): visibility 5 miles, light rain snow, mist, overcast at 1,500 feet
- From Mon 12:00 am MDT (06:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, showers nearby, overcast at 2,500 feet
- 30% chance between Mon 3:00 am MDT (09:00 UTC) and 6:00 am MDT (12:00 UTC): visibility 6 miles, light snow, overcast at 2,500 feet
- From Mon 6:00 am MDT (12:00 UTC): wind from the east-southeast at 8 knots, visibility more than 6 miles, overcast at 5,000 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 MSO 6:54 pm MDT (00:54 UTC), at HLN 6:46 pm MDT (00:46 UTC) (civil twilight ends 7:17 pm MDT (01:17 UTC)). At 120 knots the arrival at HLN is after sunset there (6:48 pm MDT (00:48 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
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, Helena Regional.