Plan a flight · Sun 5:12 pm PDT (00:12 UTC)

Seattle-Tacoma International to Shreveport Regional SEA → SHV

1,576 nautical miles (1,814 statute miles) southeast on a straight line, true course 115°, about 099° magnetic at the departure end (variation 16E). At 120 knots that is 10 h 43 min at the quickest height in today's winds (39,000 ft, a 27-knot tailwind), arriving about 5:55 am CDT (10:55 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north-northwest (340°) at 10 knots; SHV is VFR, wind from the south (170°) at 3 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: 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 W71W: thunderstorms (a convective SIGMET) up to 27,000 ft, moving from the south at 40 knots, until 6:55 pm PDT (01:55 UTC). Near the route, 489 nm along the route.

as issued

WSUS33 KKCI 112355
MKCW WST 112355
CONVECTIVE SIGMET 71W
VALID UNTIL 0155Z
WY UT ID
FROM 40S DBS-40WNW BPI-30WSW MTU-30SSW DTA-30SE TWF-40S DBS
AREA EMBD TS MOV FROM 20040KT. TOPS TO FL270.

SIGMET W70W: thunderstorms (a convective SIGMET) up to 32,000 ft, moving from the southwest at 40 knots, until 6:55 pm PDT (01:55 UTC). Over the route from 599 to 728 nm out.

as issued

WSUS33 KKCI 112355
MKCW WST 112355
CONVECTIVE SIGMET 70W
VALID UNTIL 0155Z
MT WY
FROM 30SSW MLS-60WNW BFF-40SSE OCS-10S BPI-10S BIL-30SSW MLS
AREA TS MOV FROM 22040KT. TOPS TO FL320.

AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 120 to 309 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 180 to 808 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 259 to 958 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 269 to 589 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 399 to 639 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 509 to 918 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 529 to 788 nm out.
AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 688 to 718 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 SEA.

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

urgent E545 at 6,000 ft, 16 nm southwest, 2:49 pm PDT (21:49 UTC): remarks: low-level wind shear + 5 knots fap runway 17L. 888 nm along the route, 16 nm southwest of the line.
as filed, and in English
```
APA UUA /OV APA350002/TM 2149/FL060/TP E545/RM LLWS +/- 5 KT FAP RWY 17L
```
Report
an urgent report filed through APA
Where
2 nm north (350°) of APA
Time
21:49 UTC
Height
at 6,000 ft
Aircraft
E545
Remarks
low-level wind shear + 5 knots fap runway 17L
A21N at 33,000 ft, 37 nm southwest, 3:35 pm PDT (22:35 UTC): moderate turbulence, remarks: mountain wave +25-30KTS. 768 nm along the route, 37 nm southwest of the line.
as filed, and in English
```
HDN UA /OV CHE/TM 2235/FL330/TP A21N/TB MOD/RM MTN WAVE +25-30KTS
```
Report
a routine report filed through HDN
Where
over CHE
Time
22:35 UTC
Height
at 33,000 ft
Aircraft
A21N
Turbulence
moderate
Remarks
mountain wave +25-30KTS
B39M at 32,000 ft, 22 nm southwest, 4:58 pm PDT (23:58 UTC): moderate chop turbulence, no icing, remarks: moderate mtw a 30-knot loss of airspeed ZDVWC-14. 808 nm along the route, 22 nm southwest of the line.
as filed, and in English
```
EEO UA /OV EKR069073/TM 2358/FL320/TP B39M/TB OCNL MOD CHOP/IC NEG/RM MOD MTW +/-30KT ZDVWC-14
```
Report
a routine report filed through EEO
Where
73 nm east (069°) of EKR
Time
23:58 UTC
Height
at 32,000 ft
Aircraft
B39M
Turbulence
occasional moderate chop
Icing
none
Remarks
moderate mtw a 30-knot loss of airspeed ZDVWC-14
A319 at 22,000 ft, 13 nm northeast, 2:42 pm PDT (21:42 UTC): moderate chop turbulence, remarks: ZDVWC-13. 828 nm along the route, 13 nm northeast of the line.
as filed, and in English
```
BJC UA /OV BJC322047/TM 2142/FL220/TP A319/TB MOD CHOP/RM ZDVWC-13
```
Report
a routine report filed through BJC
Where
47 nm northwest (322°) of BJC
Time
21:42 UTC
Height
at 22,000 ft
Aircraft
A319
Turbulence
moderate chop
Remarks
ZDVWC-13
BCS3 at 24,000 ft, 16 nm northeast, 4:28 pm PDT (23:28 UTC): moderate turbulence from 22,000 ft to 24,000 ft, remarks: during the descent. 848 nm along the route, 16 nm northeast of the line.
as filed, and in English
```
DEN UA /OV DEN320045/TM 2328/FL240/TP BCS3/TB MOD 240-220/RM DURD
```
Report
a routine report filed through DEN
Where
45 nm northwest (320°) of DEN
Time
23:28 UTC
Height
at 24,000 ft
Aircraft
BCS3
Turbulence
moderate from 24,000 ft to 22,000 ft
Remarks
during the descent
A21N at 32,000 ft, 45 nm northeast, 4:42 pm PDT (23:42 UTC): moderate chop turbulence, remarks: ZDVWC-61. 908 nm along the route, 45 nm northeast of the line.
as filed, and in English
```
AKO UA /OV AKO270030/TM 2342/FL320/TP A21N/TB INTMT MOD CHOP/RM ZDVWC-61
```
Report
a routine report filed through AKO
Where
30 nm west (270°) of AKO
Time
23:42 UTC
Height
at 32,000 ft
Aircraft
A21N
Turbulence
intermittent moderate chop
Remarks
ZDVWC-61
GLF5 at 45,000 ft, 30 nm southwest, 3:44 pm PDT (22:44 UTC): moderate turbulence, remarks: ZDVWC-46. 908 nm along the route, 30 nm southwest of the line.
as filed, and in English
```
COS UA /OV COS350025/TM 2244/FL450/TP GLF5/TB MOD /RM ZDVWC-46
```
Report
a routine report filed through COS
Where
25 nm north (350°) of COS
Time
22:44 UTC
Height
at 45,000 ft
Aircraft
GLF5
Turbulence
moderate
Remarks
ZDVWC-46
UAL2199 at 35,000 ft, 44 nm northeast, 4:31 pm PDT (23:31 UTC): moderate chop turbulence, wind 247° at 79 knots. 918 nm along the route, 44 nm northeast of the line.
as filed, and in English
```
ARP UAL2199 4007N 10337W 2331 F350 247/079KT TB MOD CHOP IC
```
Report
a routine report filed through ARP
A320 at 26,500 ft, 33 nm southwest, 3:46 pm PDT (22:46 UTC): moderate clear-air turbulence, remarks: ZFW86. At the destination end, 33 nm southwest of the line.
as filed, and in English
```
GGG UA /OV GGG/TM 2246/FL265/TP A320/TB MOD CAT/RM ZFW86
```
Report
a routine report filed through GGG
Where
over GGG
Time
22:46 UTC
Height
at 26,500 ft
Aircraft
A320
Turbulence
moderate clear-air turbulence
Remarks
ZFW86
C172 at 5,500 ft, 37 nm northeast, 3:17 pm PDT (22:17 UTC): a trace of rime icing, 0 °C, remarks: zse. 180 nm along the route, 37 nm northeast of the line.
as filed, and in English
```
PUW UA /OV PUW250030/TM 2217/FL055/TP C172/TA 00/IC TRACE RIME/RM -ZSE
```
Report
a routine report filed through PUW
Where
30 nm west (250°) of PUW
Time
22:17 UTC
Height
at 5,500 ft
Aircraft
C172
Temperature
0 °C
Icing
trace rime
Remarks
zse
GL7T at 40,000 ft, 33 nm southwest, 2:35 pm PDT (21:35 UTC): light to moderate turbulence from 37,500 ft to 40,000 ft, remarks: durd-zse. 200 nm along the route, 33 nm southwest of the line.
as filed, and in English
```
PDT UA /OV PDT100030/TM 2135/FL400/TP GL7T/TB OCNL LGT-MOD 400-375/RM DURD-ZSE
```
Report
a routine report filed through PDT
Where
30 nm east (100°) of PDT
Time
21:35 UTC
Height
at 40,000 ft
Aircraft
GL7T
Turbulence
occasional light to moderate from 40,000 ft to 37,500 ft
Remarks
durd-zse
C68A at 31,000 ft, 33 nm southwest, 2:49 pm PDT (21:49 UTC): a routine report with nothing remarked on. 439 nm along the route, 33 nm southwest of the line.
as filed, and in English
```
SUN UA /OV HLE060040/TM 2149/FL310/TP C68A/SK BASE074-TOP300 /ZLC
```
Report
a routine report filed through SUN
Where
40 nm northeast (060°) of HLE
Time
21:49 UTC
Height
at 31,000 ft
Aircraft
C68A
Sky
BASE074-TOP300; zlc
PC12 at 15,000 ft, 8 nm north, 4:47 pm PDT (23:47 UTC): light rime icing above 15,000 ft. 539 nm along the route, 8 nm north of the line.
as filed, and in English
```
JAC UA /OV JAC200025/TM 2347/FL150/TP PC12/IC LGT RIME 150 /ZLC
```
Report
a routine report filed through JAC
Where
25 nm south (200°) of JAC
Time
23:47 UTC
Height
at 15,000 ft
Aircraft
PC12
Icing
light rime at 15,000 ft zlc
A320 at 6,800 ft, 33 nm northeast, 3:08 pm PDT (22:08 UTC): scattered clouds above 6,800 ft; overcast above 8,000 ft. 539 nm along the route, 33 nm northeast of the line.
as filed, and in English
```
JAC UA /OV JAC/TM 2208/FL068/TP A320/SK SCT068 OVC080
```
Report
a routine report filed through JAC
Where
over JAC
Time
22:08 UTC
Height
at 6,800 ft
Aircraft
A320
Sky
SCT068 OVC080

16 more routine reports are on the map.

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 16 forecast points nearest it (SEA, YKM, LWS, BOI, DLN, PIH, LND, RKS, DEN, PUB, GLD, GCK, GAG, OKC, DAL, SHV). 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	200° at 12 kt	+5 kt	17 °C	115 kt	13 h 42 min	8:54 am CDT (13:54 UTC)
7,500 ft	200° at 16 kt	+6 kt	9 °C	114 kt	13 h 49 min	9:01 am CDT (14:01 UTC)
9,500 ft	210° at 16 kt	+3 kt	6 °C	117 kt	13 h 28 min	8:40 am CDT (13:40 UTC)
11,500 ft	210° at 20 kt	+1 kt	2 °C	119 kt	13 h 15 min	8:27 am CDT (13:27 UTC)
13,500 ft	220° at 22 kt	0	-2 °C	120 kt	13 h 08 min	8:20 am CDT (13:20 UTC)
15,500 ft	220° at 24 kt	−2 kt	-6 °C	122 kt	12 h 55 min	8:07 am CDT (13:07 UTC)
17,500 ft	220° at 26 kt	−3 kt	-10 °C	123 kt	12 h 49 min	8:01 am CDT (13:01 UTC)
18,000 ft FL180	220° at 26 kt	−3 kt	-11 °C	123 kt	12 h 49 min	8:01 am CDT (13:01 UTC)
24,000 ft FL240	220° at 30 kt	−4 kt	-21 °C	124 kt	12 h 43 min	7:55 am CDT (12:55 UTC)
30,000 ft FL300	230° at 36 kt	−11 kt	-32 °C	131 kt	12 h 02 min	7:14 am CDT (12:14 UTC)
34,000 ft FL340	240° at 45 kt	−21 kt	-38 °C	141 kt	11 h 11 min	6:23 am CDT (11:23 UTC)
39,000 ft FL390	250° at 46 kt	−27 kt	-47 °C	147 kt	10 h 43 min	5:55 am CDT (10:55 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
SEA	used from 0 nm out; 25 nm from the line	360/9	350/10 1°	010/10 -5°	030/20 -11°	020/60 -17°	010/86 -26°	360/90 -40°	010/68 -42°	360/31 -43°
YKM	used from 50 nm out; 22 nm from the line	030/16	020/18 0°	030/30 -8°	030/23 -13°	020/40 -23°	010/73 -29°	010/54 -36°	360/29 -37°	330/16 -40°
LWS	used from 150 nm out; 62 nm from the line	010/5	050/14 -2°	040/12 -6°	160/7 -10°	190/30 -22°	200/54 -27°	200/48 -35°	210/40 -37°	230/32 -41°
BOI	used from 299 nm out; 93 nm from the line		330/14 4°	230/5 -2°	220/20 -7°	210/37 -20°	200/59 -26°	200/67 -34°	210/73 -35°	220/62 -41°
DLN	used from 349 nm out; 86 nm from the line			080/10 -3°	180/8 -3°	180/23 -14°	200/58 -22°	200/80 -36°	220/85 -41°	230/81 -45°
PIH	used from 449 nm out; 50 nm from the line		270/10	270/13 1°	210/16 -2°	200/56 -11°	200/51 -23°	200/68 -33°	220/77 -37°	230/73 -44°
LND	used from 549 nm out; 75 nm from the line			180/33 10°	190/50 3°	210/59 -9°	200/50 -21°	190/41 -34°	230/55 -39°	240/65 -47°
RKS	used from 649 nm out; 30 nm from the line			190/43	210/65 3°	210/57 -9°	210/56 -21°	210/47 -33°	230/63 -37°	240/77 -46°
DEN	used from 798 nm out; 65 nm from the line			190/31 16°	210/32 7°	240/41 -8°	230/47 -21°	240/56 -32°	250/65 -37°	250/61 -47°
PUB	used from 948 nm out; 72 nm from the line			210/24 16°	210/28 8°	230/43 -8°	240/42 -21°	240/77 -30°	240/72 -36°	250/51 -47°
GLD	used from 998 nm out; 63 nm from the line		190/29	200/30 15°	240/23 8°	250/39 -7°	230/39 -19°	230/57 -31°	240/67 -39°	250/62 -49°
GCK	used from 1048 nm out; 41 nm from the line		200/35 21°	220/34 14°	240/30 8°	240/27 -6°	240/31 -17°	240/53 -30°	250/55 -39°	250/60 -50°
GAG	used from 1147 nm out; 38 nm from the line		190/34 19°	240/27 14°	240/26 8°	240/24 -6°	240/29 -16°	250/50 -28°	250/50 -39°	260/46 -50°
OKC	used from 1247 nm out; 46 nm from the line	190/29	200/29 16°	230/22 14°	240/17 9°	240/28 -6°	250/35 -15°	270/42 -29°	270/43 -39°	280/38 -51°
DAL	used from 1397 nm out; 89 nm from the line	180/21	190/24 15°	230/20 12°	220/23 8°	240/22 -5°	230/18 -15°	280/33 -29°	280/36 -39°	300/33 -52°
SHV	used from 1497 nm out; 55 nm from the line	190/11	230/19 17°	230/26 12°	260/15 7°	280/16 -4°	300/17 -15°	300/34 -30°	300/31 -41°	310/42 -52°

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 2,000 feet, a few clouds at 5,000 feet	from the north-northwest (340°) at 10 knots	10+ mi	none	432 ft	4:53 pm PDT (23:53 UTC)
PSC Pasco, WA	150 nm out, 7 nm southwest of the line, tower	VFR Sky: a few clouds at 7,000 feet	from the northeast (040°) at 11 knots	10+ mi	none	410 ft	23:53 UTC
ALW Walla Walla, WA	180 nm out, 5 nm southeast of the line, tower	VFR Sky: overcast at 4,900 feet	calm	10+ mi	4,900 ft	1,194 ft	23:53 UTC
LLJ Challis, ID	379 nm out, 1 nm southeast of the line	VFR Sky: scattered clouds at 2,600 feet, overcast at 3,500 feet Weather: light rain	from the north-northwest (340°) at 9 knots	10+ mi	3,500 ft	5,075 ft	23:55 UTC
IDA Idaho Falls, ID	489 nm out, 5 nm south of the line, tower	marginal VFR Sky: a few clouds at 800 feet, overcast at 2,400 feet Weather: rain, mist	from the north-northwest (340°) at 9 knots	4 mi	2,400 ft	4,743 ft	00:04 UTC
DWX Dixon, WY	738 nm out, 17 nm south of the line	VFR	from the south-southeast (150°) at 16 knots, gusting to 25	10+ mi	none	6,548 ft	23:55 UTC
DEN Denver, CO	888 nm out, 2 nm northeast of the line, tower	VFR Sky: a few clouds at 11,000 feet, a few clouds at 16,000 feet, a broken layer at 22,000 feet	from the south-southeast (160°) at 17 knots, gusting to 23	10+ mi	22,000 ft	5,433 ft	23:53 UTC
LIC Limon, CO	948 nm out, 2 nm north of the line	VFR	from the south-southeast (160°) at 15 knots	10+ mi	none	5,374 ft	23:55 UTC
GCK Garden City, KS	1108 nm out, 24 nm northeast of the line, tower	VFR	from the south (190°) at 17 knots, gusting to 29	10+ mi	none	2,890 ft	23:54 UTC
OUN Norman, OK	1327 nm out, 3 nm east of the line, tower	VFR Sky: scattered clouds at 6,000 feet	from the south-southeast (150°) at 15 knots	10+ mi	none	1,181 ft	23:45 UTC
PRX Paris, TX	1467 nm out, 3 nm south of the line	VFR	from the south (180°) at 7 knots	10+ mi	none	547 ft	23:55 UTC
SHV Shreveport, LA	destination	VFR Sky: a broken layer at 30,000 feet	from the south (170°) at 3 knots	10+ mi	30,000 ft	257 ft	6:56 pm CDT (23:56 UTC)

The highest airport on this list sits at 6,548 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At SHV when you get there the forecast at the estimated arrival, 5:55 am CDT (10:55 UTC)

Wind from the south at 3 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for SHV

From Sun 7:00 pm CDT (00:00 UTC): wind from the south-southeast at 6 knots, visibility more than 6 miles, a few clouds at 20,000 feet, a broken layer at 30,000 feet
From Sun 10:00 pm CDT (03:00 UTC): wind from the south at 3 knots, visibility more than 6 miles, clear skies
From Mon 11:00 am CDT (16:00 UTC): wind from the south at 12 knots, gusting to 19, visibility more than 6 miles, scattered clouds at 25,000 feet

The forecast for SEA, the departure

From Sun 5:00 pm PDT (00:00 UTC): wind from the north at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 2,000 feet, a few clouds at 5,000 feet
From Sun 8:00 pm PDT (03:00 UTC): wind from the northeast at 6 knots, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, visibility more than 6 miles, patches of fog, clear skies
From Mon 9:00 am PDT (16:00 UTC): wind from the south-southeast at 4 knots, 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 northwest at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 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 6:27 pm PDT (01:27 UTC), at SHV 6:47 pm CDT (23:47 UTC) (civil twilight ends 7:12 pm CDT (00:12 UTC)). At 120 knots the arrival at SHV is before sunrise there (7:16 am CDT (12:16 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, Shreveport Regional.