Plan a flight · Sun 8:34 pm PDT (03:34 UTC)

Boeing Fld/King County International to Baltimore/Washington International Thurgood Marshall BFI → BWI

2,023 nautical miles (2,328 statute miles) east on a straight line, true course 087°, about 072° magnetic at the departure end (variation 15E). At 120 knots that is 12 h 20 min at the quickest height in today's winds (39,000 ft, a 44-knot tailwind), arriving about 11:54 am EDT (15:54 UTC). Right now BFI is VFR, wind calm; BWI is low IFR, wind from the east-northeast (060°) 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: 7 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 1C: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 40 knots, until 9:55 pm PDT (04:55 UTC). Over the route from 767 to 767 nm out.

as issued

WSUS32 KKCI 120255
MKCC WST 120255
CONVECTIVE SIGMET 1C
VALID UNTIL 0455Z
SD ND MT WY
FROM 30WSW DIK-50NW DPR-60WNW RAP-50ENE SHR-30WSW DIK
AREA TS MOV FROM 22040KT. TOPS TO FL300.

SIGMET E11E: thunderstorms (a convective SIGMET) up to 34,000 ft, moving from the southwest at 20 knots, until 9:55 pm PDT (04:55 UTC). Over the last 110 nm of the route.

as issued

WSUS31 KKCI 120255
MKCE WST 120255
CONVECTIVE SIGMET 11E
VALID UNTIL 0455Z
NY NJ PA DE MD VA DC WV AND DE NJ NY MD CT VA CSTL WTRS
FROM 20NE JFK-90SE SIE-20NNW ORF-30ENE EKN-10S JST-20NE JFK
AREA EMBD TS MOV FROM 24020KT. TOPS TO FL340.

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 169 nm of the route.
AIRMET ZULU 2C: moderate icing up to 20,000 ft. Over the route from 60 to 488 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 239 to 548 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 259 to 458 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 917 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 987 to 1096 nm out.
AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the last 468 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the last 189 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1834 to 1973 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 BFI.

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

A320 at 33,000 ft, 7 nm south, 5:36 pm PDT (00:36 UTC): moderate turbulence above 33,000 ft, remarks: zob. 1595 nm along the route, 7 nm south of the line.
as filed, and in English
```
JXN UA /OV JXN280030/TM 0036/FL330/TP A320/TB OCNL MOD 330/RM ZOB
```
Report
a routine report filed through JXN
Where
30 nm west (280°) of JXN
Time
00:36 UTC
Height
at 33,000 ft
Aircraft
A320
Turbulence
occasional moderate at 33,000 ft
Remarks
zob
B38M at 29,000 ft, 44 nm southwest, 5:55 pm PDT (00:55 UTC): moderate turbulence above 29,000 ft, remarks: zob. 1864 nm along the route, 44 nm southwest of the line.
as filed, and in English
```
MPG UA /OV AIR120030/TM 0055/FL290/TP B38M /TB OCNL MOD 290/RM ZOB
```
Report
a routine report filed through MPG
Where
30 nm southeast (120°) of AIR
Time
00:55 UTC
Height
at 29,000 ft
Aircraft
B38M
Turbulence
occasional moderate at 29,000 ft
Remarks
zob
B752 at 30,000 ft, 29 nm northeast, 7:26 pm PDT (02:26 UTC): moderate chop turbulence, remarks: zob. At the destination end, 29 nm northeast of the line.
as filed, and in English
```
HGR UA /OV THS010020/TM 0226/FL300/TP B752/TB MOD CHOP/RM ZOB
```
Report
a routine report filed through HGR
Where
20 nm north (010°) of THS
Time
02:26 UTC
Height
at 30,000 ft
Aircraft
B752
Turbulence
moderate chop
Remarks
zob
UAL1558 at 30,000 ft, 32 nm northeast, 7:22 pm PDT (02:22 UTC): moderate turbulence, -36 °C, wind 240° at 50 knots. At the destination end, 32 nm northeast of the line.
as filed, and in English
```
ARP UAL1558 4014N 07742W 0222 F300 MS36 240/050KT TB MODERATE SK CLEAR IC NONE
```
Report
a routine report filed through ARP
B38M at 20,000 ft, 34 nm south, 8:11 pm PDT (03:11 UTC): moderate clear-air turbulence from 20,000 ft to 25,000 ft. At the destination end, 34 nm south of the line.
as filed, and in English
```
IAD UA /OV AML300020/TM 0311/FL200/TP B38M/TB MOD CAT 200-250
```
Report
a routine report filed through IAD
Where
20 nm northwest (300°) of AML
Time
03:11 UTC
Height
at 20,000 ft
Aircraft
B38M
Turbulence
moderate clear-air turbulence from 20,000 ft to 25,000 ft
A321 at 13,500 ft, 41 nm south, 6:54 pm PDT (01:54 UTC): remarks: zse. At the departure end, 41 nm south of the line.
as filed, and in English
```
SEA UA /OV SEA120045/TM 0154/FL135/TP A321/SK TOP130/RM ZSE
```
Report
a routine report filed through SEA
Where
45 nm southeast (120°) of SEA
Time
01:54 UTC
Height
at 13,500 ft
Aircraft
A321
Sky
TOP130
Remarks
zse
PC12 at 15,000 ft, 41 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 41 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL150/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 15,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse
PC12 at 13,000 ft, 41 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 41 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL130/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 13,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse
SB20 at 16,000 ft, 18 nm north, 6:52 pm PDT (01:52 UTC): remarks: zse. At the departure end, 18 nm north of the line.
as filed, and in English
```
PAE UA /OV PAE075045/TM 0152/FL160/TP SB20/SK TOP120/RM ZSE
```
Report
a routine report filed through PAE
Where
45 nm east (075°) of PAE
Time
01:52 UTC
Height
at 16,000 ft
Aircraft
SB20
Sky
TOP120
Remarks
zse
E75L descending, 48 nm north, 6:06 pm PDT (01:06 UTC): overcast above 4,000 ft. 319 nm along the route, 48 nm north of the line.
as filed, and in English
```
GPI UA /OV KGPI/TM 0106/FLDURD/TP E75L/SK OVC040
```
Report
a routine report filed through GPI
Where
over KGPI
Time
01:06 UTC
Height
during the descent
Aircraft
E75L
Sky
overcast from 4,000 ft
CL30 at 4,200 ft, 36 nm south, 8:16 pm PDT (03:16 UTC): no icing, overcast above 4,200 ft, remarks: during the descent ils runway 12. 339 nm along the route, 36 nm south of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0316/FL042/TP CL30/SK OVC042/WX 2 1/2SM/IC NEG/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
03:16 UTC
Height
at 4,200 ft
Aircraft
CL30
Sky
overcast from 4,200 ft
Weather
2, 1/2SM
Icing
none
Remarks
during the descent ils runway 12
BCS1 at 3,700 ft, 36 nm south, 6:47 pm PDT (01:47 UTC): snow, rain, remarks: during the descent ils runway 12. 339 nm along the route, 36 nm south 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, 36 nm south, 5:36 pm PDT (00:36 UTC): no icing, overcast above 4,100 ft, remarks: during the descent ils runway 12. 339 nm along the route, 36 nm south 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
B789 at 35,000 ft, 44 nm north, 6:57 pm PDT (01:57 UTC): light turbulence. 817 nm along the route, 44 nm north of the line.
as filed, and in English
```
DIK UA /OV DIK040030/TM 0157/FL350/TP B789/TB CONS LGT/ OCNL MOD CHOP/ NEG 370
```
Report
a routine report filed through DIK
Where
30 nm northeast (040°) of DIK
Time
01:57 UTC
Height
at 35,000 ft
Aircraft
B789
Turbulence
continuous light occasional moderate chop no at 37,000 ft

16 more routine reports are on the map.

Winds aloft along the route, and the time en route the forecast for use 02:00–09:00 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 18 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, BIL, MLS, DIK, ABR, AXN, MSP, LSE, GRB, MKG, FWA, CLE, AGC, PSB). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
3,500 ft	260° at 9 kt	−7 kt		127 kt	15 h 56 min	3:30 pm EDT (19:30 UTC)
5,500 ft	230° at 1 kt	−1 kt	3 °C	121 kt	16 h 43 min	4:17 pm EDT (20:17 UTC)
7,500 ft	260° at 3 kt	−3 kt	8 °C	123 kt	16 h 27 min	4:01 pm EDT (20:01 UTC)
9,500 ft	250° at 5 kt	−4 kt	3 °C	124 kt	16 h 19 min	3:53 pm EDT (19:53 UTC)
11,500 ft	240° at 9 kt	−7 kt	1 °C	127 kt	15 h 56 min	3:30 pm EDT (19:30 UTC)
13,500 ft	250° at 12 kt	−10 kt	-3 °C	130 kt	15 h 34 min	3:08 pm EDT (19:08 UTC)
15,500 ft	250° at 14 kt	−13 kt	-7 °C	133 kt	15 h 13 min	2:47 pm EDT (18:47 UTC)
17,500 ft	260° at 17 kt	−16 kt	-11 °C	136 kt	14 h 52 min	2:26 pm EDT (18:26 UTC)
18,000 ft FL180	260° at 18 kt	−17 kt	-12 °C	137 kt	14 h 46 min	2:20 pm EDT (18:20 UTC)
24,000 ft FL240	260° at 20 kt	−19 kt	-23 °C	139 kt	14 h 33 min	2:07 pm EDT (18:07 UTC)
30,000 ft FL300	260° at 24 kt	−24 kt	-37 °C	144 kt	14 h 03 min	1:37 pm EDT (17:37 UTC)
34,000 ft FL340	270° at 34 kt	−34 kt	-42 °C	154 kt	13 h 08 min	12:42 pm EDT (16:42 UTC)
39,000 ft FL390	270° at 44 kt	−44 kt	-48 °C	164 kt	12 h 20 min	11:54 am EDT (15:54 UTC)

Based on data from the 12th at 00:00 UTC; valid on the 12th at 06:00 UTC for use 02:00 to 09:00 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; 26 nm from the line	050/7	050/11 1°	050/12 -5°	030/31 -7°	010/61 -15°	010/69 -26°	360/73 -40°	360/62 -47°	330/21 -43°
YKM	used from 50 nm out; 60 nm from the line	070/10	040/15 -1°	020/27 -8°	030/25 -13°	020/48 -20°	010/83 -27°	010/77 -37°	010/49 -40°	350/14 -41°
GEG	used from 100 nm out; 69 nm from the line		080/16 -2°	050/17 -7°	080/9 -10°	190/33 -21°	180/31 -32°	L/V -35°	L/V -37°	270/8 -40°
GPI	used from 249 nm out; 69 nm from the line		070/19 -5°	100/16 -7°	080/10 -8°	130/8 -19°	170/37 -28°	200/50 -40°	210/43 -40°	220/41 -42°
GTF	used from 349 nm out; 70 nm from the line		070/11	080/15 -7°	110/19 -9°	190/25 -14°	200/34 -23°	200/54 -39°	220/66 -40°	220/77 -44°
BIL	used from 548 nm out; 80 nm from the line		080/13	180/9 -2°	210/38 0°	220/51 -11°	210/46 -22°	210/58 -35°	230/73 -39°	230/72 -45°
MLS	used from 598 nm out; 58 nm from the line		150/23 2°	190/29 4°	210/44 2°	220/32 -10°	210/36 -21°	200/48 -37°	230/63 -40°	240/71 -47°
DIK	used from 748 nm out; 29 nm from the line		150/24 7°	200/38 6°	220/53 0°	230/51 -9°	230/49 -21°	240/37 -37°	240/47 -44°	250/65 -48°
ABR	used from 897 nm out; 72 nm from the line	070/14	250/10 17°	270/16 11°	260/28 5°	260/36 -10°	260/41 -22°	270/33 -37°	260/42 -42°	260/50 -48°
AXN	used from 1047 nm out; 52 nm from the line	100/14	250/21 14°	240/24 12°	240/31 5°	260/36 -10°	260/40 -21°	250/42 -36°	260/48 -45°	260/53 -50°
MSP	used from 1146 nm out; 42 nm from the line	230/26	240/30 17°	240/24 12°	250/22 5°	250/35 -10°	260/36 -21°	250/41 -36°	250/49 -45°	260/58 -52°
LSE	used from 1246 nm out; 44 nm from the line	230/40	240/24 17°	240/13 10°	250/13 6°	280/22 -9°	250/28 -21°	250/41 -34°	260/42 -44°	270/62 -53°
GRB	used from 1395 nm out; 64 nm from the line	250/36	270/23 16°	270/14 9°	240/18 4°	280/26 -9°	280/29 -20°	290/42 -36°	290/51 -45°	290/72 -55°
MKG	used from 1445 nm out; 64 nm from the line	260/22	290/16 15°	300/11 10°	290/5 3°	300/26 -9°	300/32 -20°	320/48 -36°	320/61 -45°	310/74 -53°
FWA	used from 1595 nm out; 80 nm from the line	300/17	320/20 16°	330/20 10°	340/15 3°	310/27 -8°	320/37 -20°	330/52 -36°	330/65 -43°	330/60 -50°
CLE	used from 1645 nm out; 82 nm from the line	340/7	010/16 13°	350/18 8°	350/20 3°	340/31 -10°	340/46 -21°	340/54 -37°	330/62 -44°	340/65 -49°
AGC	used from 1794 nm out; 40 nm from the line	350/14	330/20 11°	340/18 8°	330/17 3°	340/22 -11°	340/31 -22°	330/33 -36°	300/34 -41°	300/35 -47°
PSB	used from 1894 nm out; 58 nm from the line		360/13 13°	330/14 7°	300/11 3°	290/12 -11°	240/23 -23°	270/25 -36°	250/34 -40°	250/45 -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
BFI Seattle, WA	departure	VFR	calm	10+ mi	none	21 ft	7:53 pm PDT (02:53 UTC)
GEG Spokane, WA	189 nm out, 4 nm northeast of the line, tower	VFR Sky: a broken layer at 6,000 feet, a broken layer at 11,000 feet	from the northeast (040°) at 10 knots	10+ mi	6,000 ft	2,385 ft	02:53 UTC
THM Thompson Falls, MT	289 nm out, 5 nm northwest of the line	no report just now				2,467 ft
GTF Great Falls, MT	439 nm out, 8 nm northeast of the line, tower	low IFR Sky: a few clouds at 300 feet, overcast at 700 feet Weather: light snow, mist	from the north-northeast (020°) at 10 knots	0.75 mi	700 ft	3,680 ft	02:53 UTC
DIK Dickinson, ND	797 nm out, 18 nm north of the line	low IFR Sky: overcast at 400 feet Weather: rain, mist	from the northeast (050°) at 16 knots, gusting to 23	5 mi	400 ft	2,592 ft	02:56 UTC
ASY Ashley, ND	947 nm out, 5 nm north of the line	no report just now				2,034 ft
FCM Minneapolis, MN	1206 nm out, 5 nm north of the line, tower	VFR	from the south (190°) at 8 knots	10+ mi	none	906 ft	02:53 UTC
CMY Sparta, WI	1326 nm out, 8 nm south of the line, tower	VFR	from the south (190°) at 13 knots, gusting to 19	10+ mi	none	839 ft	02:55 UTC
BTL Battle Creek, MI	1595 nm out, 9 nm southwest of the line, tower	VFR	from the south-southwest (210°) at 5 knots	9 mi	none	951 ft	02:53 UTC
JXN Jackson, MI	1625 nm out, 4 nm north of the line, tower	marginal VFR Sky: overcast at 1,000 feet	calm	10+ mi	1,000 ft	1,000 ft	02:56 UTC
HGR Hagerstown, MD	1963 nm out, 4 nm northeast of the line, tower	IFR Sky: a few clouds at 400 feet, a broken layer at 2,300 feet, overcast at 3,400 feet Weather: light rain, mist	from the north (010°) at 10 knots	2.5 mi	2,300 ft	703 ft	03:30 UTC
BWI Baltimore, MD	destination	low IFR Sky: overcast at 400 feet Weather: mist	from the east-northeast (060°) at 8 knots	5 mi	400 ft	143 ft	10:54 pm EDT (02:54 UTC)

The highest airport on this list sits at 3,680 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BWI when you get there the forecast at the estimated arrival, 11:54 am EDT (15:54 UTC)

Wind from the north-northwest at 12 knots, gusting to 21, visibility more than 6 miles, a broken layer at 1,500 feet, overcast at 2,500 feet marginal VFR

The whole forecast for BWI

From Sun 11:00 pm EDT (03:00 UTC): wind from the north-northeast at 4 knots, visibility 4 miles, light rain showers, mist, overcast at 400 feet
From Mon 1:00 am EDT (05:00 UTC): wind from the north at 7 knots, visibility 3 miles, light rain showers, mist, overcast at 600 feet
From Mon 7:00 am EDT (11:00 UTC): wind from the north-northwest at 10 knots, gusting to 18, visibility more than 6 miles, scattered clouds at 700 feet, overcast at 1,500 feet
From Mon 11:00 am EDT (15:00 UTC): wind from the north-northwest at 12 knots, gusting to 21, visibility more than 6 miles, a broken layer at 1,500 feet, overcast at 2,500 feet
From Mon 2:00 pm EDT (18:00 UTC): wind from the north-northwest at 10 knots, gusting to 17, visibility more than 6 miles, a broken layer at 3,500 feet
From Mon 6:00 pm EDT (22:00 UTC): wind from the northwest at 6 knots, visibility more than 6 miles, a few clouds at 4,500 feet, scattered clouds at 25,000 feet

The forecast for BFI, the departure

From Sun 8:00 pm PDT (03:00 UTC): wind calm, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind calm, 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 3 knots, visibility more than 6 miles, clear skies
From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 3 knots, visibility more than 6 miles, clear skies
From Mon 2:00 pm PDT (21:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, clear skies

Temporary flight restrictions on the line or within 25 nm of it

6/8587 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local on the route, 1784 nm along the route · a VIP movement · today · ZOB
6/8888 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 22 nm from the route, 1804 nm along the route · security · today · ZOB
6/8829 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 6 nm from the route, 1804 nm along the route · a VIP movement · today · ZOB
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 16 nm from the route, at the destination end · a VIP movement · today · ZDC
4/9383 WASHINGTON, DC., USA 12 nm from the route, at the destination end · security · ZDC
6/8800 Baltimore, MD, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 6 nm from the route, at the destination end · drones kept away from a public gathering · starts Saturday 17 October · ZDC

Daylight

Sunset at BFI 6:27 pm PDT (01:27 UTC), at BWI 6:32 pm EDT (22:32 UTC) (civil twilight ends 6:59 pm EDT (22:59 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 upper Mississippi valley · 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: Boeing Fld/King County International, Baltimore/Washington International Thurgood Marshall.