Plan a flight · Sun 8:33 pm PDT (03:33 UTC)

San Francisco International to Washington Dulles International SFO → IAD

2,097 nautical miles (2,413 statute miles) east on a straight line, true course 074°, about 060° magnetic at the departure end (variation 14E). At 120 knots that is 12 h 38 min at the quickest height in today's winds (34,000 ft, a 46-knot tailwind), arriving about 12:11 pm EDT (16:11 UTC). Right now SFO is VFR, wind from the southwest (220°) at 6 knots; IAD is IFR, wind from the north-northwest (340°) at 10 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: 5,463 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 W12W: thunderstorms (a convective SIGMET) up to 31,000 ft, moving from the southwest at 20 knots, until 9:55 pm PDT (04:55 UTC). Over the route from 220 to 329 nm out.
as issued
```
WSUS33 KKCI 120255
MKCW WST 120255
CONVECTIVE SIGMET 12W
VALID UNTIL 0455Z
NV
FROM 40SSE TWF-10W ELY-30SE OAL-30W OAL-70WSW TWF-40SSE TWF
AREA TS MOV FROM 24020KT. TOPS TO FL310.
```

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 90 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 110 nm of the route.
AIRMET TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Over the route from 160 to 310 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 200 to 669 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 240 to 669 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 319 to 899 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 489 to 939 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 589 to 809 nm out.
AIRMET TANGO 3W: 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 929 to 1348 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 409 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1917 to 2067 nm out.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the last 150 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 SFO.

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

E75L at 22,000 ft, 15 nm north, 6:04 pm PDT (01:04 UTC): moderate turbulence. 549 nm along the route, 15 nm north of the line.
as filed, and in English
```
PUC UA /OV PUC320020/TM 0104/FL220/TP E75L/TB MOD /ZLC
```
Report
a routine report filed through PUC
Where
20 nm northwest (320°) of PUC
Time
01:04 UTC
Height
at 22,000 ft
Aircraft
E75L
Turbulence
moderate zlc
S22T at 14,000 ft, 10 nm north, 6:23 pm PDT (01:23 UTC): moderate rime icing, -16 °C. 559 nm along the route, 10 nm north of the line.
as filed, and in English
```
PUC UA /OV PUC360015/TM 0123/FL140/TP S22T/TA M16/IC MOD RIME /ZLC
```
Report
a routine report filed through PUC
Where
15 nm north (360°) of PUC
Time
01:23 UTC
Height
at 14,000 ft
Aircraft
S22T
Temperature
−16 °C
Icing
moderate rime zlc
E75L at 28,000 ft, 4 nm southwest, 6:31 pm PDT (01:31 UTC): moderate turbulence, remarks: ZDVWC-03. 729 nm along the route, 4 nm southwest of the line.
as filed, and in English
```
EEO UA /OV EKR085036/TM 0131/FL280/TP E75L/TB MOD/RM ZDVWC-03
```
Report
a routine report filed through EEO
Where
36 nm east (085°) of EKR
Time
01:31 UTC
Height
at 28,000 ft
Aircraft
E75L
Turbulence
moderate
Remarks
ZDVWC-03
CRJ2 at 19,000 ft, 37 nm north, 5:47 pm PDT (00:47 UTC): moderate chop turbulence, remarks: ZDVWC-13. 789 nm along the route, 37 nm north of the line.
as filed, and in English
```
EGE UA /OV RLG010052/TM 0047/FL190/TP CRJ2/TB COSN MOD CHOP/RM ZDVWC-13
```
Report
a routine report filed through EGE
Where
52 nm north (010°) of RLG
Time
00:47 UTC
Height
at 19,000 ft
Aircraft
CRJ2
Turbulence
cosn moderate chop
Remarks
ZDVWC-13
GLF4 at 25,000 ft, 38 nm south, 7:05 pm PDT (02:05 UTC): moderate turbulence, remarks: during the climb ZDVWC-05. 799 nm along the route, 38 nm south of the line.
as filed, and in English
```
DEN UA /OV FQF250040/TM 0205/FL250/TP GLF4/TB MOD /RM DURC ZDVWC-05
```
Report
a routine report filed through DEN
Where
40 nm west (250°) of FQF
Time
02:05 UTC
Height
at 25,000 ft
Aircraft
GLF4
Turbulence
moderate
Remarks
during the climb ZDVWC-05
B738 at 23,000 ft, 16 nm south, 7:34 pm PDT (02:34 UTC): moderate turbulence, remarks: during the climb ZDVWC-05. 809 nm along the route, 16 nm south of the line.
as filed, and in English
```
DEN UA /OV DVV270030/TM 0234/FL230/TP B738/TB MOD /RM DURC ZDVWC-05
```
Report
a routine report filed through DEN
Where
30 nm west (270°) of DVV
Time
02:34 UTC
Height
at 23,000 ft
Aircraft
B738
Turbulence
moderate
Remarks
during the climb ZDVWC-05
BCS1 at 24,000 ft, 16 nm south, 6:30 pm PDT (01:30 UTC): moderate turbulence from 22,000 ft to 24,000 ft, remarks: during the climb ZDVWC-05. 809 nm along the route, 16 nm south of the line.
as filed, and in English
```
DEN UA /OV DVV270030/TM 0130/FL240/TP BCS1/TB MOD 220-240/RM DURC ZDVWC-05
```
Report
a routine report filed through DEN
Where
30 nm west (270°) of DVV
Time
01:30 UTC
Height
at 24,000 ft
Aircraft
BCS1
Turbulence
moderate from 22,000 ft to 24,000 ft
Remarks
during the climb ZDVWC-05
B38M at 29,000 ft, 26 nm north, 5:55 pm PDT (00:55 UTC): moderate turbulence above 29,000 ft, remarks: zob. 1957 nm along the route, 26 nm north 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
B38M at 20,000 ft, 3 nm north, 8:11 pm PDT (03:11 UTC): moderate clear-air turbulence from 20,000 ft to 25,000 ft. At the destination end, 3 nm north 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
PC12 at 25,000 ft, 0 nm west, 6:35 pm PDT (01:35 UTC): light rime icing, -16 °C, remarks: during the descent zlc. 479 nm along the route, 0 nm west of the line.
as filed, and in English
```
DTA UA /OV DTA360010/TM 0135/FL250/TP PC12/TA M16/IC LGT RIME /RM DURD /ZLC
```
Report
a routine report filed through DTA
Where
10 nm north (360°) of DTA
Time
01:35 UTC
Height
at 25,000 ft
Aircraft
PC12
Temperature
−16 °C
Icing
light rime
Remarks
during the descent zlc
PRM1 at 21,000 ft, 22 nm north, 6:03 pm PDT (01:03 UTC): light rime icing, -15 °C. 499 nm along the route, 22 nm north of the line.
as filed, and in English
```
PVU UA /OV FFU180025/TM 0103/FL210/TP PRM1/TA M15/IC LGT RIME /ZLC
```
Report
a routine report filed through PVU
Where
25 nm south (180°) of FFU
Time
01:03 UTC
Height
at 21,000 ft
Aircraft
PRM1
Temperature
−15 °C
Icing
light rime zlc
GLF6 at 45,000 ft, 5 nm south, 7:24 pm PDT (02:24 UTC): light chop turbulence, remarks: ZDVWC-03. 559 nm along the route, 5 nm south of the line.
as filed, and in English
```
PUC UA /OV PUC1130028/TM 0224/FL450/TP GLF6/TB CONS LGT CHOP/RM ZDVWC-03
```
Report
a routine report filed through PUC
Where
28 nm southeast (130°) of PUC1
Time
02:24 UTC
Height
at 45,000 ft
Aircraft
GLF6
Turbulence
continuous light chop
Remarks
ZDVWC-03
UAL2479 at 36,000 ft, 50 nm south, 8:11 pm PDT (03:11 UTC): no turbulence, wind 231° at 49 knots. 689 nm along the route, 50 nm south of the line.
as filed, and in English
```
ARP UAL2479 3910N 10753W 0311 F360 231/049KT TB SMTH IC
```
Report
a routine report filed through ARP
CL35 at 41,000 ft, 8 nm south, 7:40 pm PDT (02:40 UTC): remarks: mtw +/-50FT a 15-knot loss of airspeed ZDVWC-05. 759 nm along the route, 8 nm south of the line.
as filed, and in English
```
EGE UA /OV RLG/TM 0240/FL410/TP CL35/RM MTW +/-50FT +/-15KT ZDVWC-05
```
Report
a routine report filed through EGE
Where
over RLG
Time
02:40 UTC
Height
at 41,000 ft
Aircraft
CL35
Remarks
mtw +/-50FT a 15-knot loss of airspeed ZDVWC-05

12 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 (SFO, SAC, RNO, BIH, ELY, SLC, GJT, DEN, GLD, GRI, OMA, DSM, BRL, SPI, IND, CVG, CMH, EKN). 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	260° at 16 kt	−17 kt	16 °C	137 kt	15 h 18 min	2:51 pm EDT (18:51 UTC)
7,500 ft	240° at 18 kt	−18 kt	11 °C	138 kt	15 h 12 min	2:45 pm EDT (18:45 UTC)
9,500 ft	250° at 16 kt	−17 kt	7 °C	137 kt	15 h 18 min	2:51 pm EDT (18:51 UTC)
11,500 ft	250° at 16 kt	−17 kt	3 °C	137 kt	15 h 18 min	2:51 pm EDT (18:51 UTC)
13,500 ft	250° at 18 kt	−18 kt	-1 °C	138 kt	15 h 12 min	2:45 pm EDT (18:45 UTC)
15,500 ft	250° at 20 kt	−20 kt	-5 °C	140 kt	14 h 59 min	2:32 pm EDT (18:32 UTC)
17,500 ft	250° at 22 kt	−23 kt	-9 °C	143 kt	14 h 40 min	2:13 pm EDT (18:13 UTC)
18,000 ft FL180	250° at 22 kt	−23 kt	-10 °C	143 kt	14 h 40 min	2:13 pm EDT (18:13 UTC)
24,000 ft FL240	250° at 28 kt	−29 kt	-21 °C	149 kt	14 h 04 min	1:37 pm EDT (17:37 UTC)
30,000 ft FL300	250° at 35 kt	−37 kt	-32 °C	157 kt	13 h 21 min	12:54 pm EDT (16:54 UTC)
34,000 ft FL340	260° at 43 kt	−46 kt	-37 °C	166 kt	12 h 38 min	12:11 pm EDT (16:11 UTC)
39,000 ft FL390	260° at 42 kt	−45 kt	-47 °C	165 kt	12 h 43 min	12:16 pm EDT (16:16 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
SFO	used from 0 nm out; 25 nm from the line	120/13	090/14 5°	040/14 -1°	350/17 -5°	360/42 -14°	360/64 -23°	350/38 -32°	300/19 -37°	250/18 -44°
SAC	used from 50 nm out; 45 nm from the line	110/6	L/V 4°	010/11 -2°	350/11 -7°	340/24 -16°	360/44 -23°	330/24 -30°	270/21 -35°	230/23 -43°
RNO	used from 100 nm out; 79 nm from the line		010/9	320/10 -2°	210/23 -9°	210/34 -19°	220/36 -25°	230/31 -29°	230/41 -33°	230/38 -42°
BIH	used from 150 nm out; 64 nm from the line		L/V	240/7 1°	190/13 -3°	200/26 -16°	210/43 -26°	220/54 -28°	220/51 -35°	220/47 -43°
ELY	used from 250 nm out; 94 nm from the line			200/39 3°	210/27 -2°	210/45 -15°	220/56 -24°	210/60 -28°	210/63 -34°	220/61 -43°
SLC	used from 449 nm out; 85 nm from the line		200/5	230/8 2°	220/20 -2°	210/40 -12°	190/53 -25°	210/62 -30°	220/69 -34°	220/64 -43°
GJT	used from 549 nm out; 95 nm from the line			210/43 7°	230/45 1°	220/49 -12°	220/62 -22°	220/59 -28°	230/60 -33°	220/55 -45°
DEN	used from 749 nm out; 69 nm from the line			240/21 14°	250/44 6°	220/49 -8°	220/49 -21°	230/54 -30°	240/57 -35°	240/49 -45°
GLD	used from 899 nm out; 81 nm from the line		230/49	230/42 15°	220/26 8°	240/18 -7°	230/27 -21°	240/62 -30°	240/61 -35°	250/57 -47°
GRI	used from 1048 nm out; 64 nm from the line		230/35 21°	230/23 13°	220/20 7°	240/25 -8°	240/37 -20°	250/49 -33°	260/57 -38°	260/58 -47°
OMA	used from 1198 nm out; 49 nm from the line	220/47	240/33 19°	250/18 11°	230/17 6°	260/29 -8°	250/33 -19°	250/51 -33°	260/61 -40°	270/62 -49°
DSM	used from 1298 nm out; 64 nm from the line	230/40	250/33 17°	250/18 12°	240/17 5°	260/28 -8°	270/34 -19°	260/41 -33°	260/55 -41°	270/62 -51°
BRL	used from 1398 nm out; 42 nm from the line	230/24	240/29 15°	290/16 10°	280/15 4°	260/23 -7°	260/32 -19°	260/36 -33°	280/48 -41°	280/59 -52°
SPI	used from 1498 nm out; 30 nm from the line	220/21	250/23 16°	260/27 9°	270/14 6°	270/23 -7°	270/31 -19°	270/28 -33°	290/48 -42°	300/55 -52°
IND	used from 1597 nm out; 66 nm from the line	290/16	310/20 16°	320/21 10°	330/13 3°	300/25 -7°	320/32 -19°	330/46 -34°	320/61 -43°	320/63 -50°
CVG	used from 1747 nm out; 53 nm from the line	320/18	350/32 16°	350/35 10°	350/30 3°	330/30 -7°	340/44 -20°	340/58 -35°	330/72 -41°	320/36 -49°
CMH	used from 1797 nm out; 22 nm from the line	330/15	340/22 14°	340/24 9°	340/23 4°	340/35 -9°	340/49 -20°	340/58 -37°	330/70 -42°	340/55 -47°
EKN	used from 1897 nm out; 71 nm from the line		330/21 12°	330/25 7°	350/22 2°	330/24 -10°	310/27 -21°	320/33 -35°	290/31 -39°	290/34 -47°

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
SFO San Francisco, CA	departure	VFR Sky: a few clouds at 2,000 feet	from the southwest (220°) at 6 knots	10+ mi	none	13 ft	7:56 pm PDT (02:56 UTC)
SCK Stockton, CA	60 nm out, 4 nm west of the line, tower	VFR Sky: a broken layer at 9,000 feet	from the west (270°) at 7 knots	10+ mi	9,000 ft	32 ft	02:55 UTC
ELY Ely, NV	369 nm out, 12 nm north of the line	VFR Sky: scattered clouds at 4,100 feet, a broken layer at 5,000 feet, overcast at 6,000 feet Weather: light rain	from the south (170°) at 10 knots	10+ mi	5,000 ft	6,259 ft	02:53 UTC
PUC Price, UT	559 nm out, 4 nm south of the line	VFR Sky: a broken layer at 5,500 feet, overcast at 7,000 feet	from the south (180°) at 7 knots	10+ mi	5,500 ft	5,957 ft	02:53 UTC
FNL Fort Collins/Loveland, CO	829 nm out, 13 nm north of the line, tower	VFR	from the northeast (050°) at 5 knots	10+ mi	none	5,020 ft	02:56 UTC
DEN Denver, CO	839 nm out, 25 nm south of the line, tower	VFR Sky: a few clouds at 14,000 feet, a broken layer at 22,000 feet	from the south-southwest (200°) at 16 knots	10+ mi	22,000 ft	5,433 ft	02:53 UTC
LNK Lincoln, NE	1198 nm out, 18 nm north of the line, tower	VFR	from the south-southeast (160°) at 8 knots	10+ mi	none	1,218 ft	02:54 UTC
EOK Keokuk, IA	1448 nm out, 2 nm northwest of the line	reported, no category	from the south-southeast (160°) at 6 knots	10+ mi	none	671 ft	03:15 UTC
BMI Bloomington/Normal, IL	1558 nm out, 11 nm north of the line, tower	VFR	from the south (180°) at 5 knots	10+ mi	none	871 ft	02:56 UTC
DAY Dayton, OH	1777 nm out, 1 nm northeast of the line, tower	marginal VFR Sky: overcast at 1,200 feet	from the west-northwest (290°) at 7 knots	8 mi	1,200 ft	1,009 ft	02:56 UTC
CKB Clarksburg, WV	1967 nm out, 5 nm south of the line, tower	marginal VFR Sky: a few clouds at 500 feet, a broken layer at 1,100 feet, overcast at 5,000 feet	from the west (280°) at 3 knots	10+ mi	1,100 ft	1,223 ft	03:12 UTC
IAD Washington, DC	destination	IFR Sky: overcast at 600 feet Weather: light rain	from the north-northwest (340°) at 10 knots	10+ mi	600 ft	312 ft	10:52 pm EDT (02:52 UTC)

The highest airport on this list sits at 6,259 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At IAD when you get there the forecast at the estimated arrival, 12:11 pm EDT (16:11 UTC)

Wind from the north-northwest at 13 knots, gusting to 21, visibility more than 6 miles, overcast at 2,100 feet marginal VFR

The whole forecast for IAD

From Sun 11:00 pm EDT (03:00 UTC): wind from the north-northwest at 10 knots, visibility 3 miles, light rain showers, mist, overcast at 600 feet
From Mon 6:00 am EDT (10:00 UTC): wind from the north-northwest at 11 knots, gusting to 19, visibility more than 6 miles, overcast at 1,400 feet
From Mon 12:00 pm EDT (16:00 UTC): wind from the north-northwest at 13 knots, gusting to 21, visibility more than 6 miles, overcast at 2,100 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 4,000 feet
From Mon 7:00 pm EDT (23:00 UTC): wind from the northwest at 6 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

The forecast for SFO, the departure

From Sun 8:00 pm PDT (03:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, a few clouds at 2,000 feet
From Mon 1:00 am PDT (08:00 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 east-northeast at 5 knots, visibility more than 6 miles, clear skies
From Mon 3:00 pm PDT (22:00 UTC): wind from the west at 10 knots, visibility more than 6 miles, clear skies

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

6/7231 Santa Clara, CA, Sunday, October 11, 2026 through Monday, October 12, 2026 UTC 18 nm from the route, at the departure end · drones kept away from a public gathering · until 12 October · ZOA
4/9383 WASHINGTON, DC., USA 8 nm from the route, at the destination end · security · ZDC
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 4 nm from the route, at the destination end · a VIP movement · today · ZDC

Daylight

Sunset at SFO 6:36 pm PDT (01:36 UTC), at IAD 6:36 pm EDT (22:36 UTC) (civil twilight ends 7:02 pm EDT (23:02 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 Southwest · loop National Weather Service

Radar now, the southern Rockies · loop National Weather Service

Radar now, the northern 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: San Francisco International, Washington Dulles International.