Boise Air Trml/Gowen Field to Casper/Natrona County International BOI → CPR
428 nautical miles (493 statute miles) east on a straight line, true course 092°, about 079° magnetic at the departure end (variation 13E). At 120 knots that is 2 h 48 min at the quickest height in today's winds (34,000 ft, a 33-knot tailwind), arriving about 7:30 am MDT (13:30 UTC). Right now BOI is VFR, wind from the west-northwest (290°) at 6 knots; CPR is VFR, wind from the west-southwest (240°) at 20 knots, gusting to 26. 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: 287 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 route from 40 to 209 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 40 to 379 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 60 to 279 nm out.
- AIRMET TANGO 1W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the last 20 nm of the route.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Near the route, 409 nm along the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft (due to mountain wave) from 34,000 ft to 43,000 ft. Over the last 10 nm of the route.
- AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Near the route, at the destination end.
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 BOI.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- BE9L at 17,000 ft, 6 nm northeast, 3:42 am MDT (09:42 UTC): light rime icing from 15,000 ft to 17,000 ft, 0 °C, remarks: zdvwc. 409 nm along the route, 6 nm northeast of the line.
as filed, and in English
CPR UA /OV DDY250025/TM 0942/FL170/TP BE9L/TA 00/IC LGT RIME 150-170/RM ZDVWC
- Report
- a routine report filed through CPR
- Where
- 25 nm west (250°) of DDY
- Time
- 09:42 UTC
- Height
- at 17,000 ft
- Aircraft
- BE9L
- Temperature
- 0 °C
- Icing
- light rime from 15,000 ft to 17,000 ft
- Remarks
- zdvwc
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 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 3 forecast points nearest it (BOI, PIH, LND). 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 | 020° at 5 kt | +1 kt | 1 °C | 119 kt | 3 h 36 min | 8:18 am MDT (14:18 UTC) |
| 7,500 ft | 220° at 4 kt | −2 kt | 1 °C | 122 kt | 3 h 30 min | 8:12 am MDT (14:12 UTC) |
| 9,500 ft | 200° at 10 kt | −3 kt | -1 °C | 123 kt | 3 h 29 min | 8:11 am MDT (14:11 UTC) |
| 11,500 ft | 210° at 21 kt | −10 kt | -3 °C | 130 kt | 3 h 18 min | 8:00 am MDT (14:00 UTC) |
| 13,500 ft | 210° at 29 kt | −14 kt | -7 °C | 134 kt | 3 h 12 min | 7:54 am MDT (13:54 UTC) |
| 15,500 ft | 210° at 37 kt | −17 kt | -11 °C | 137 kt | 3 h 07 min | 7:49 am MDT (13:49 UTC) |
| 17,500 ft | 210° at 45 kt | −20 kt | -15 °C | 140 kt | 3 h 03 min | 7:45 am MDT (13:45 UTC) |
| 18,000 ft FL180 | 210° at 46 kt | −20 kt | -16 °C | 140 kt | 3 h 03 min | 7:45 am MDT (13:45 UTC) |
| 24,000 ft FL240 | 210° at 48 kt | −23 kt | -27 °C | 143 kt | 3 h | 7:42 am MDT (13:42 UTC) |
| 30,000 ft FL300 | 210° at 59 kt | −29 kt | -32 °C | 149 kt | 2 h 52 min | 7:34 am MDT (13:34 UTC) |
| 34,000 ft FL340 | 220° at 57 kt | −33 kt | -35 °C | 153 kt | 2 h 48 min | 7:30 am MDT (13:30 UTC) |
| 39,000 ft FL390 | 220° at 53 kt | −30 kt | -42 °C | 150 kt | 2 h 51 min | 7:33 am MDT (13:33 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BOI | used from 0 nm out; 25 nm from the line | 320/11 1° | 280/8 -5° | 220/14 -11° | 200/60 -19° | 190/66 -31° | 210/46 -32° | 220/50 -33° | 220/43 -39° | |
| PIH | used from 100 nm out; 47 nm from the line | 070/8 | 150/19 1° | 180/32 -4° | 210/44 -17° | 210/37 -28° | 210/74 -31° | 220/68 -35° | 220/60 -43° | |
| LND | used from 249 nm out; 60 nm from the line | 240/10 3° | 240/30 0° | 220/42 -13° | 230/52 -23° | 220/54 -33° | 220/52 -36° | 220/53 -44° |
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 |
|---|---|---|---|---|---|---|---|
| BOI Boise, ID | departure | VFR Sky: a broken layer at 10,000 feet | from the west-northwest (290°) at 6 knots | 10+ mi | 10,000 ft | 2,871 ft | 3:53 am MDT (09:53 UTC) |
| SUN Hailey, ID | 80 nm out, 4 nm east of the line, tower | VFR Sky: scattered clouds at 2,500 feet, a broken layer at 3,600 feet, overcast at 4,300 feet Weather: light rain | calm | 7 mi | 3,600 ft | 5,319 ft | 10:35 UTC |
| AOC Arco, ID | 130 nm out, 10 nm north of the line | no report just now | 5,334 ft | ||||
| IDA Idaho Falls, ID | 179 nm out, 8 nm north of the line, tower | VFR Sky: scattered clouds at 2,300 feet, overcast at 3,600 feet | from the north-northeast (030°) at 7 knots | 10+ mi | 3,600 ft | 4,743 ft | 10:13 UTC |
| JAC Jackson, WY | 239 nm out, 19 nm north of the line, tower | VFR Sky: a broken layer at 3,800 feet, overcast at 5,000 feet Weather: light rain | calm | 10+ mi | 3,800 ft | 6,451 ft | 09:56 UTC |
| DUB Dubois, WY | 279 nm out, 20 nm north of the line | VFR Sky: scattered clouds at 4,300 feet, scattered clouds at 5,000 feet | from the west-northwest (290°) at 10 knots | 10+ mi | none | 7,298 ft | 10:35 UTC |
| RIW Riverton, WY | 339 nm out, 3 nm south of the line | marginal VFR Sky: a broken layer at 2,000 feet | from the north (360°) at 15 knots, gusting to 21 | 10+ mi | 2,000 ft | 5,516 ft | 10:36 UTC |
| CPR Casper, WY | destination | VFR Sky: overcast at 6,000 feet | from the west-southwest (240°) at 20 knots, gusting to 26 | 10+ mi | 6,000 ft | 5,344 ft | 3:53 am MDT (09:53 UTC) |
The highest airport on this list sits at 7,298 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At CPR when you get there the forecast at the estimated arrival, 7:30 am MDT (13:30 UTC)
Wind from the south-southwest at 11 knots, visibility more than 6 miles, a broken layer at 10,000 feet VFR
The whole forecast for CPR
- From Mon 12:00 am MDT (06:00 UTC): wind from the south-southwest at 11 knots, visibility more than 6 miles, a broken layer at 10,000 feet
- 30% chance between Mon 12:00 am MDT (06:00 UTC) and 4:00 am MDT (10:00 UTC): visibility 5 miles, light rain showers, a broken layer at 3,000 feet
- From Mon 9:00 am MDT (15:00 UTC): wind from the north at 8 knots, visibility more than 6 miles, scattered clouds at 2,000 feet, a broken layer at 3,500 feet
- From Mon 3:00 pm MDT (21:00 UTC): wind from the north-northeast at 10 knots, visibility more than 6 miles, light rain showers, scattered clouds at 1,500 feet, a broken layer at 5,000 feet and more above
- From Mon 6:00 pm MDT (00:00 UTC): wind from the northeast at 10 knots, visibility 6 miles, light rain showers, scattered clouds at 1,000 feet, a broken layer at 2,000 feet and more above
- 30% chance between Mon 6:00 pm MDT (00:00 UTC) and 12:00 am MDT (06:00 UTC): visibility 4 miles, rain, a broken layer at 1,200 feet
The forecast for BOI, the departure
- From Mon 12:00 am MDT (06:00 UTC): wind light and variable, visibility more than 6 miles, a broken layer at 8,000 feet
- From Mon 2:00 am MDT (08:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 feet, a broken layer at 8,000 feet
- From Mon 12:00 pm MDT (18:00 UTC): wind from the northwest at 10 knots, visibility more than 6 miles, a broken layer at 10,000 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 BOI 7:05 pm MDT (01:05 UTC), at CPR 6:26 pm MDT (00:26 UTC) (civil twilight ends 6:55 pm MDT (00:55 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: Boise Air Trml/Gowen Field, Casper/Natrona County International.