Plan a flight · Mon 7:16 am CDT (12:16 UTC)

Huntsville Intl-Carl T Jones Field to Seattle-Tacoma International HSV → SEA

1,763 nautical miles (2,029 statute miles) northwest on a straight line, true course 307°, about 311° magnetic at the departure end (variation 4W). At 120 knots that is 15 h 44 min at the quickest height in today's winds (12,500 ft, a 8-knot headwind), arriving about 9:00 pm PDT (04:00 UTC), after sunset at the destination. Right now HSV is VFR, wind from the east (100°) at 4 knots; SEA is VFR, wind calm. 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

AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Near the route, at the departure end.
AIRMET TANGO 2W: 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 route from 319 to 747 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 777 to 1465 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 route from 867 to 1026 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 route from 966 to 976 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1056 to 1574 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1096 to 1275 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 1295 to 1594 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 1435 to 1734 nm out.

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 HSV.

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

urgent B763 at 2,000 ft, 25 nm southwest, 6:57 am CDT (11:57 UTC): a routine report with nothing remarked on. 498 nm along the route, 25 nm southwest of the line.
as filed, and in English
```
FOE UUA /OV 130003/TM 1157/FL020/TP B763/WV LLWS
```
Report
an urgent report filed through FOE
Where
wind from 130° at 3 knots
Time
11:57 UTC
Height
at 2,000 ft
Aircraft
B763
Wind
low-level wind shear
PC12 at 22,000 ft, 40 nm southwest, 7:00 am CDT (12:00 UTC): light rime icing, -9 °C, remarks: no icing at FL200 zkcfdc xj. 548 nm along the route, 40 nm southwest of the line.
as filed, and in English
```
MHK UA /OV MHK/TM 1200/FL220/TP PC12/TA M09/IC LGT RIME/RM NEG ICING AT FL200 /ZKCFDC XJ
```
Report
a routine report filed through MHK
Where
over MHK
Time
12:00 UTC
Height
at 22,000 ft
Aircraft
PC12
Temperature
−9 °C
Icing
light rime
Remarks
no icing at FL200 zkcfdc xj
CRJ7 at 36,000 ft, 32 nm southwest, 7:09 am CDT (12:09 UTC): light chop turbulence, remarks: zdvwc. 767 nm along the route, 32 nm southwest of the line.
as filed, and in English
```
LBF UA /OV LBF/TM 1209/FL360/TP CRJ7/TB LGT CHOP/RM ZDVWC
```
Report
a routine report filed through LBF
Where
over LBF
Time
12:09 UTC
Height
at 36,000 ft
Aircraft
CRJ7
Turbulence
light chop
Remarks
zdvwc
BE9L at 17,000 ft, 44 nm southwest, 4:42 am CDT (09:42 UTC): light rime icing from 15,000 ft to 17,000 ft, 0 °C, remarks: zdvwc. 1056 nm along the route, 44 nm southwest 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 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 17 forecast points nearest it (HSV, MEM, CGI, SGF, COU, MKC, SLN, GRI, ONL, BFF, RAP, LND, BIL, DLN, LWS, YKM, SEA). 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	260° at 19 kt	+14 kt	21 °C	106 kt	16 h 38 min	9:54 pm PDT (04:54 UTC)
6,500 ft	260° at 17 kt	+12 kt	12 °C	108 kt	16 h 19 min	9:35 pm PDT (04:35 UTC)
8,500 ft	250° at 14 kt	+9 kt	6 °C	111 kt	15 h 53 min	9:09 pm PDT (04:09 UTC)
10,500 ft	250° at 15 kt	+9 kt	4 °C	111 kt	15 h 53 min	9:09 pm PDT (04:09 UTC)
12,500 ft	240° at 16 kt	+8 kt	0 °C	112 kt	15 h 44 min	9:00 pm PDT (04:00 UTC)
14,500 ft	240° at 16 kt	+8 kt	-4 °C	112 kt	15 h 44 min	9:00 pm PDT (04:00 UTC)
16,500 ft	240° at 16 kt	+8 kt	-8 °C	112 kt	15 h 44 min	9:00 pm PDT (04:00 UTC)
18,000 ft FL180	240° at 16 kt	+8 kt	-12 °C	112 kt	15 h 44 min	9:00 pm PDT (04:00 UTC)
24,000 ft FL240	240° at 26 kt	+12 kt	-23 °C	108 kt	16 h 19 min	9:35 pm PDT (04:35 UTC)
30,000 ft FL300	260° at 36 kt	+26 kt	-33 °C	94 kt	18 h 45 min	12:01 am PDT (07:01 UTC)
34,000 ft FL340	260° at 40 kt	+30 kt	-38 °C	90 kt	19 h 35 min	12:51 am PDT (07:51 UTC)
39,000 ft FL390	260° at 40 kt	+31 kt	-46 °C	89 kt	19 h 49 min	1:05 am PDT (08:05 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
HSV	used from 0 nm out; 25 nm from the line	300/20	310/14 16°	310/18 10°	310/15 4°	320/19 -5°	290/16 -18°	320/36 -32°	320/47 -41°	330/42 -50°
MEM	used from 100 nm out; 75 nm from the line	250/19	260/19 17°	270/20 12°	270/16 6°	270/21 -6°	290/27 -17°	300/37 -30°	300/49 -40°	310/40 -51°
CGI	used from 149 nm out; 53 nm from the line	260/22	250/15 15°	250/13 11°	250/16 6°	270/29 -7°	280/30 -18°	290/40 -31°	290/55 -40°	300/51 -51°
SGF	used from 299 nm out; 62 nm from the line	230/37	260/20 15°	250/16 13°	250/15 8°	260/28 -7°	250/31 -17°	280/59 -31°	280/59 -39°	290/55 -50°
COU	used from 349 nm out; 57 nm from the line	250/36	260/14 16°	250/5 12°	260/12 6°	260/24 -7°	260/35 -19°	280/58 -31°	280/62 -40°	290/60 -49°
MKC	used from 399 nm out; 39 nm from the line	240/49	240/21 20°	220/19 13°	230/21 6°	260/26 -7°	250/37 -19°	270/66 -31°	270/65 -38°	280/60 -48°
SLN	used from 548 nm out; 81 nm from the line	230/49	240/41 22°	230/26 15°	220/21 7°	240/38 -8°	240/44 -21°	260/77 -29°	270/70 -36°	270/63 -48°
GRI	used from 598 nm out; 46 nm from the line		230/39 23°	230/32 15°	210/29 7°	230/31 -8°	230/43 -21°	250/52 -31°	260/59 -35°	260/59 -46°
ONL	used from 747 nm out; 100 nm from the line		250/31 22°	230/27 16°	220/25 8°	230/25 -9°	220/29 -22°	250/42 -33°	250/48 -36°	250/52 -46°
BFF	used from 797 nm out; 91 nm from the line		280/28	260/39 11°	240/34 5°	210/38 -11°	210/52 -22°	230/61 -31°	230/61 -36°	240/56 -45°
RAP	used from 996 nm out; 117 nm from the line		250/28 16°	260/31 10°	240/25 4°	210/35 -10°	200/45 -23°	230/47 -31°	230/47 -36°	230/51 -46°
LND	used from 1046 nm out; 107 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°
BIL	used from 1146 nm out; 83 nm from the line		300/14	270/19 -2°	260/26 -2°	220/28 -13°	210/51 -25°	220/56 -33°	220/61 -39°	220/72 -45°
DLN	used from 1245 nm out; 69 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°
LWS	used from 1445 nm out; 68 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°
YKM	used from 1594 nm out; 71 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°
SEA	used from 1694 nm out; 45 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°

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
HSV Huntsville, AL	departure	VFR Sky: scattered clouds at 13,000 feet	from the east (100°) at 4 knots	10+ mi	none	628 ft	6:53 am CDT (11:53 UTC)
MKL Jackson, TN	120 nm out, 15 nm southwest of the line, tower	VFR	from the south-southwest (200°) at 5 knots	10+ mi	none	434 ft	11:53 UTC
TBN Fort Leonard Wood, MO	319 nm out, 3 nm north of the line, tower	VFR	from the south (180°) at 5 knots	10+ mi	none	1,159 ft	11:55 UTC
OJC Olathe, KS	458 nm out, 8 nm southwest of the line, tower	VFR	from the south (190°) at 8 knots, gusting to 18	10+ mi	none	1,096 ft	11:53 UTC
GRI Grand Island, NE	667 nm out, 17 nm northeast of the line, tower	VFR	from the south (190°) at 11 knots	10+ mi	none	1,847 ft	11:53 UTC
BBW Broken Bow, NE	727 nm out, 13 nm north of the line	VFR	calm	10+ mi	none	2,546 ft	11:53 UTC
LSK Lusk, WY	956 nm out, 14 nm southwest of the line	no report just now				4,966 ft
COD Cody, WY	1186 nm out, 3 nm east of the line	marginal VFR Sky: overcast at 1,600 feet	from the north-northeast (020°) at 6 knots	10+ mi	1,600 ft	5,102 ft	11:56 UTC
EKS Ennis, MT	1305 nm out, 3 nm northeast of the line	IFR Sky: overcast at 800 feet	calm	10+ mi	800 ft	5,432 ft	11:55 UTC
LWS Lewiston, ID	1534 nm out, 8 nm southwest of the line, tower	VFR Sky: scattered clouds at 7,000 feet, overcast at 9,500 feet	from the east-northeast (060°) at 5 knots	10+ mi	9,500 ft	1,442 ft	11:56 UTC
MWH Moses Lake, WA	1644 nm out, 15 nm northeast of the line, tower	VFR	from the north-northwest (330°) at 5 knots	10+ mi	none	1,188 ft	11:52 UTC
SEA Seattle, WA	destination	VFR	calm	10+ mi	none	432 ft	4:53 am PDT (11:53 UTC)

The highest airport on this list sits at 5,432 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At SEA when you get there the forecast at the estimated arrival, 9:00 pm PDT (04:00 UTC)

Wind from the south at 4 knots, visibility more than 6 miles, scattered clouds at 25,000 feet VFR

The whole forecast for SEA

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

The forecast for HSV, the departure

From Mon 7:00 am CDT (12:00 UTC): wind light and variable, visibility 6 miles, mist, clear skies
From Mon 10:00 am CDT (15:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, clear skies
From Mon 7:00 pm CDT (00:00 UTC): wind light and variable, visibility more than 6 miles, clear skies

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 HSV 6:16 pm CDT (23:16 UTC), at SEA 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 UTC)). At 120 knots the arrival at SEA is after sunset there (6:27 pm PDT (01:27 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 lower Mississippi valley · loop National Weather Service

Radar now, the upper Mississippi valley · loop National Weather Service

Radar now, the southern Plains · 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: Huntsville Intl-Carl T Jones Field, Seattle-Tacoma International.