Plan a flight · Mon 7:06 am PDT (14:06 UTC)

Seattle-Tacoma International to Northern Colorado Regional SEA → FNL

855 nautical miles (984 statute miles) southeast on a straight line, true course 113°, about 097° magnetic at the departure end (variation 16E). At 120 knots that is 6 h 35 min at the quickest height in today's winds (39,000 ft, a 10-knot tailwind), arriving about 2:41 pm MDT (20:41 UTC). Right now SEA is VFR, wind from the southeast (130°) at 7 knots; FNL is VFR, wind from the southeast (140°) 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: 2 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 W27W: thunderstorms (a convective SIGMET) up to 27,000 ft, moving from the west at 45 knots, until 8:55 am PDT (15:55 UTC). Near the route, 577 nm along the route.

as issued

WSUS33 KKCI 121355
MKCW WST 121355
CONVECTIVE SIGMET 27W
VALID UNTIL 1555Z
WY UT ID
FROM 40E PIH-20NW BPI-50E SLC-20SW SLC-40E PIH
DMSHG AREA TS MOV FROM 26045KT. TOPS TO FL270.

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 50 to 318 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 169 to 348 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 169 to 785 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 358 to 746 nm out.
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 368 to 616 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft (due to mountain wave) from 34,000 ft to 43,000 ft. Over the last 159 nm of the route.
AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the last 109 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 SEA.

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

B738 descending, 10 nm southwest, 6:01 am PDT (13:01 UTC): moderate turbulence from 11,000 ft to 20,000 ft. At the destination end, 10 nm southwest of the line.
as filed, and in English
```
DEN UA /OV 40NW DEN/TM 1301/FLDURD/TP B738/TB MOD 200-110
```
Report
a routine report filed through DEN
Where
40NW den
Time
13:01 UTC
Height
during the descent
Aircraft
B738
Turbulence
moderate from 20,000 ft to 11,000 ft
B737 at 16,000 ft, 7 nm southwest, 5:23 am PDT (12:23 UTC): moderate turbulence, remarks: during the descent. At the destination end, 7 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN320040/TM 1223/FL160/TP B737/TB MOD/RM DURD
```
Report
a routine report filed through DEN
Where
40 nm northwest (320°) of DEN
Time
12:23 UTC
Height
at 16,000 ft
Aircraft
B737
Turbulence
moderate
Remarks
during the descent
CRJ2 at 19,000 ft, 14 nm southwest, 4:49 am PDT (11:49 UTC): no turbulence, remarks: ZDVWC-13. 815 nm along the route, 14 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN304074/TM 1149/FL190/TP CRJ2/TB NEG/RM ZDVWC-13
```
Report
a routine report filed through DEN
Where
74 nm northwest (304°) of DEN
Time
11:49 UTC
Height
at 19,000 ft
Aircraft
CRJ2
Turbulence
none
Remarks
ZDVWC-13
CRJ2 at 24,000 ft, 6 nm southwest, 4:45 am PDT (11:45 UTC): no turbulence, remarks: ZDVWC-13. At the destination end, 6 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN314057/TM 1145/FL240/TP CRJ2/TB NEG/RM ZDVWC-13
```
Report
a routine report filed through DEN
Where
57 nm northwest (314°) of DEN
Time
11:45 UTC
Height
at 24,000 ft
Aircraft
CRJ2
Turbulence
none
Remarks
ZDVWC-13
B737 at 18,000 ft, 24 nm southeast, 6:50 am PDT (13:50 UTC): light to moderate turbulence, remarks: from the surface to 18,000 ft. At the destination end, 24 nm southeast of the line.
as filed, and in English
```
DEN UA /OV DEN350020/TM 1350/FL180/TP B737/TB LGT-MOD/RM SFC-180
```
Report
a routine report filed through DEN
Where
20 nm north (350°) of DEN
Time
13:50 UTC
Height
at 18,000 ft
Aircraft
B737
Turbulence
light to moderate
Remarks
from the surface to 18,000 ft
CRJ2 at 7,000 ft, 42 nm southeast, 6:30 am PDT (13:30 UTC): no turbulence. At the destination end, 42 nm southeast of the line.
as filed, and in English
```
DEN UA /OV 5N/TM 1330/FL070/TP CRJ2/TB NEG
```
Report
a routine report filed through DEN
Where
5N
Time
13:30 UTC
Height
at 7,000 ft
Aircraft
CRJ2
Turbulence
none
B738 at 5,500 ft, 39 nm southeast, 5:28 am PDT (12:28 UTC): no turbulence. At the destination end, 39 nm southeast of the line.
as filed, and in English
```
DEN UA /OV KDEN/TM 1228/FLSFC/TP B738/TB NEG
```
Report
a routine report filed through DEN
Where
over KDEN
Time
12:28 UTC
Height
at the surface
Aircraft
B738
Turbulence
none
B38M at 21,000 ft, 36 nm southwest, 4:24 am PDT (11:24 UTC): light to moderate chop turbulence, remarks: during the climb zdvwc. At the destination end, 36 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN277039/TM 1124/FL210/TP B38M/TB LGT-MOD CHOP BLO 180 NEG ABV 180/RM DURC. ZDVWC
```
Report
a routine report filed through DEN
Where
39 nm west (277°) of DEN
Time
11:24 UTC
Height
at 21,000 ft
Aircraft
B38M
Turbulence
light to moderate chop below 18,000 ft no above 18,000 ft
Remarks
during the climb 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 9 forecast points nearest it (SEA, YKM, LWS, BOI, DLN, PIH, LND, RKS, DEN). 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	360° at 6 kt	−2 kt	1 °C	122 kt	7 h	3:06 pm MDT (21:06 UTC)
7,500 ft	260° at 3 kt	−2 kt	-1 °C	122 kt	7 h	3:06 pm MDT (21:06 UTC)
9,500 ft	230° at 4 kt	−1 kt	-2 °C	121 kt	7 h 04 min	3:10 pm MDT (21:10 UTC)
11,500 ft	230° at 8 kt	−1 kt	-5 °C	121 kt	7 h 04 min	3:10 pm MDT (21:10 UTC)
13,500 ft	220° at 11 kt	−1 kt	-8 °C	121 kt	7 h 04 min	3:10 pm MDT (21:10 UTC)
15,500 ft	210° at 13 kt	0	-12 °C	120 kt	7 h 08 min	3:14 pm MDT (21:14 UTC)
17,500 ft	210° at 15 kt	+1 kt	-15 °C	119 kt	7 h 11 min	3:17 pm MDT (21:17 UTC)
18,000 ft FL180	210° at 16 kt	+2 kt	-16 °C	118 kt	7 h 15 min	3:21 pm MDT (21:21 UTC)
24,000 ft FL240	230° at 25 kt	−5 kt	-26 °C	125 kt	6 h 50 min	2:56 pm MDT (20:56 UTC)
30,000 ft FL300	230° at 29 kt	−6 kt	-34 °C	126 kt	6 h 47 min	2:53 pm MDT (20:53 UTC)
34,000 ft FL340	230° at 35 kt	−9 kt	-37 °C	129 kt	6 h 38 min	2:44 pm MDT (20:44 UTC)
39,000 ft FL390	230° at 39 kt	−10 kt	-43 °C	130 kt	6 h 35 min	2:41 pm MDT (20:41 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
SEA	used from 0 nm out; 25 nm from the line	350/5	010/6 0°	010/9 -4°	010/27 -6°	010/51 -15°	360/58 -26°	360/60 -41°	350/55 -48°	340/30 -45°
YKM	used from 50 nm out; 23 nm from the line	360/6	360/11 -1°	030/20 -7°	040/21 -11°	020/55 -18°	010/84 -26°	010/79 -40°	010/45 -42°	350/23 -42°
LWS	used from 149 nm out; 60 nm from the line	L/V	340/5 -3°	L/V -6°	040/7 -10°	100/23 -22°	180/30 -31°	190/11 -34°	200/11 -36°	220/23 -40°
BOI	used from 298 nm out; 101 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°
DLN	used from 348 nm out; 79 nm from the line			190/10 -4°	220/23 -4°	210/21 -18°	210/43 -28°	210/60 -33°	210/72 -37°	210/67 -44°
PIH	used from 447 nm out; 62 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 547 nm out; 70 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°
RKS	used from 696 nm out; 72 nm from the line			250/9	230/21 -1°	210/43 -14°	220/59 -23°	220/55 -32°	220/53 -35°	220/48 -44°
DEN	used from 795 nm out; 71 nm from the line			270/24 11°	230/13 5°	230/48 -8°	230/46 -20°	230/63 -30°	240/78 -36°	240/78 -48°

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
SEA Seattle, WA	departure	VFR Sky: a few clouds at 8,000 feet	from the southeast (130°) at 7 knots	10+ mi	none	432 ft	6:53 am PDT (13:53 UTC)
ELN Ellensburg, WA	80 nm out, 7 nm north of the line	VFR	calm	10+ mi	none	1,763 ft	13:53 UTC
PSC Pasco, WA	149 nm out, 11 nm southwest of the line, tower	VFR Sky: overcast at 9,000 feet	from the north-northwest (340°) at 5 knots	10+ mi	9,000 ft	410 ft	13:53 UTC
ALW Walla Walla, WA	189 nm out, 7 nm southwest of the line, tower	VFR Sky: overcast at 6,000 feet	from the south (190°) at 7 knots	10+ mi	6,000 ft	1,194 ft	13:53 UTC
LLJ Challis, ID	378 nm out, 10 nm south of the line	VFR Sky: scattered clouds at 1,500 feet, a broken layer at 3,100 feet, overcast at 5,000 feet	from the north (350°) at 6 knots	10+ mi	3,100 ft	5,075 ft	13:55 UTC
IDA Idaho Falls, ID	487 nm out, 17 nm south of the line, tower	IFR Sky: overcast at 800 feet Weather: rain, mist	from the west-southwest (250°) at 6 knots	6 mi	800 ft	4,743 ft	13:53 UTC
JAC Jackson, WY	537 nm out, 18 nm northeast of the line, tower	VFR Sky: overcast at 5,000 feet	from the north-northeast (020°) at 7 knots	10+ mi	5,000 ft	6,451 ft	13:56 UTC
LND Lander, WY	636 nm out, 25 nm northeast of the line	IFR Sky: a broken layer at 500 feet, overcast at 1,400 feet Weather: mist	from the north-northwest (330°) at 5 knots	4 mi	500 ft	5,588 ft	14:00 UTC
SAA Saratoga, WY	756 nm out, 3 nm north of the line	VFR Sky: scattered clouds at 4,500 feet, scattered clouds at 6,500 feet, a broken layer at 7,500 feet	from the south-southwest (200°) at 4 knots	10+ mi	7,500 ft	7,014 ft	13:50 UTC
FNL Fort Collins/Loveland, CO	destination	VFR	from the southeast (140°) at 8 knots	8 mi	none	5,020 ft	7:56 am MDT (13:56 UTC)

The highest airport on this list sits at 7,014 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At FNL when you get there the forecast at the estimated arrival, 2:41 pm MDT (20:41 UTC)

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

The forecast for SEA, the departure

From Mon 5:00 am PDT (12:00 UTC): wind from the southeast at 5 knots, visibility more than 6 miles, clear skies
From Mon 9:00 am PDT (16:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind from the south at 4 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
From Tue 4:00 am PDT (11:00 UTC): wind from the south 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

No temporary flight restriction on or near this route right now.

Daylight

Sunset at SEA 6:25 pm PDT (01:25 UTC), at FNL 6:23 pm MDT (00:23 UTC) (civil twilight ends 6:50 pm MDT (00:50 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 Pacific Northwest · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the southern Rockies · 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: Seattle-Tacoma International, Northern Colorado Regional.