Plan a flight · Mon 4:10 am PDT (11:10 UTC)

Oakland San Francisco Bay Airport to General Edward Lawrence Logan International OAK → BOS

2,335 nautical miles (2,687 statute miles) northeast on a straight line, true course 067°, about 053° magnetic at the departure end (variation 14E). At 120 knots that is 14 h 04 min at the quickest height in today's winds (39,000 ft, a 46-knot tailwind), arriving about 9:14 pm EDT (01:14 UTC), after sunset at the destination. Right now OAK is VFR, wind from the east (100°) at 5 knots; BOS is IFR, wind from the north (360°) at 7 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: 3 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 W21W: thunderstorms (a convective SIGMET) up to 27,000 ft, moving from the southwest at 20 knots, until 5:55 am PDT (12:55 UTC). Near the route, 469 nm along the route.
as issued
```
WSUS33 KKCI 121055
MKCW WST 121055
CONVECTIVE SIGMET 21W
VALID UNTIL 1255Z
UT ID NV
FROM 40ENE TWF-20SSE PIH-40E BVL-20WNW BVL-40ENE TWF
AREA TS MOV FROM 24020KT. TOPS TO FL270.
```
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 210 nm of the route.
AIRMET SIERRA 2E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 80 to 130 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 239 to 738 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 259 to 768 nm out.
AIRMET TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 12,000 ft. Over the route from 399 to 619 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 549 to 868 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 708 to 948 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 718 to 758 nm out.
AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the route from 728 to 828 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 908 to 1157 nm out.
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 1108 to 1397 nm out.
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). Near the route, 1716 nm along the route.
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 589 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 2095 to 2255 nm out.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 33,000 ft. Over the last 180 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 OAK.

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

A35K at 32,000 ft, 21 nm north, 1:39 am PDT (08:39 UTC): moderate chop turbulence, remarks: fdcs zoa. At the departure end, 21 nm north of the line.
as filed, and in English
```
OAK UA /OV OAK348024/TM 0839/FL320/TP A35K/TB MOD CHOP/RM FDCS ZOA
```
Report
a routine report filed through OAK
Where
24 nm north (348°) of OAK
Time
08:39 UTC
Height
at 32,000 ft
Aircraft
A35K
Turbulence
moderate chop
Remarks
fdcs zoa
A321 at 9,500 ft, 9 nm northeast, 2:05 am PDT (09:05 UTC): moderate turbulence, remarks: moderate turbulence during the descent jfund arrival from from 9,500 ft to 7,000 ft, smooth below. At the destination end, 9 nm northeast of the line.
as filed, and in English
```
BOS UA /OV BOS350010/TM 0905/FL095/TP A321/TB MOD/RM MOD TB DURD JFUND ARR FROM 095-070, SMOOTH BELOW
```
Report
a routine report filed through BOS
Where
10 nm north (350°) of BOS
Time
09:05 UTC
Height
at 9,500 ft
Aircraft
A321
Turbulence
moderate
Remarks
moderate turbulence during the descent jfund arrival from from 9,500 ft to 7,000 ft, smooth below
BCS3 at 10,000 ft, 1 nm southeast, 3:15 am PDT (10:15 UTC): moderate turbulence from 7,000 ft to 9,000 ft, remarks: during the climb ssoxs aid. At the destination end, 1 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS/TM 1015/FL100/TP BCS3/TB MOD 070-090/RM DURC SSOXS AID
```
Report
a routine report filed through BOS
Where
over BOS
Time
10:15 UTC
Height
at 10,000 ft
Aircraft
BCS3
Turbulence
moderate from 7,000 ft to 9,000 ft
Remarks
during the climb ssoxs aid
B739 at 34,000 ft, 21 nm south, 3:58 am PDT (10:58 UTC): no turbulence. 1577 nm along the route, 21 nm south of the line.
as filed, and in English
```
UES UA /OV BAE/TM 1058/FL340/TP B739/TB NEG
```
Report
a routine report filed through UES
Where
over BAE
Time
10:58 UTC
Height
at 34,000 ft
Aircraft
B739
Turbulence
none
CL35 at 6,000 ft, 47 nm south, 3:47 am PDT (10:47 UTC): overcast from 1,400 ft to 2,600 ft; clear from 2,600 ft to 60,000 ft, remarks: clear above 2,600 ft. 1786 nm along the route, 47 nm south of the line.
as filed, and in English
```
PTK UA /OV PTK270006/TM 1047/FL060/TP CL35/SK OVC014-TOP026/RM CLEAR ABOVE 026
```
Report
a routine report filed through PTK
Where
6 nm west (270°) of PTK
Time
10:47 UTC
Height
at 6,000 ft
Aircraft
CL35
Sky
overcast from 1,400 ft, tops 2,600 ft
Remarks
clear above 2,600 ft
B739 at 9,000 ft, 49 nm south, 3:33 am PDT (10:33 UTC): no turbulence, no icing, clear from 9,000 ft to 60,000 ft, wind 295° at 13 knots, remarks: during the descent. 1806 nm along the route, 49 nm south of the line.
as filed, and in English
```
DTW UA /OV DXO033026/TM 1033/FL090/TP B739/SK SKC/WV 29513KTS/TB NEG/IC NEG/RM DURD
```
Report
a routine report filed through DTW
Where
26 nm northeast (033°) of DXO
Time
10:33 UTC
Height
at 9,000 ft
Aircraft
B739
Sky
clear
Wind
from 295° at 13 knots
Turbulence
none
Icing
none
Remarks
during the descent
B738 climbing, 15 nm south, 3:20 am PDT (10:20 UTC): overcast from 2,500 ft to 4,200 ft; scattered clouds above 700 ft. 1996 nm along the route, 15 nm south of the line.
as filed, and in English
```
BUF UA /OV BUF/TM 1020/FLDURC/TP B738/SK SCT007 OVC025 TOPS042
```
Report
a routine report filed through BUF
Where
over BUF
Time
10:20 UTC
Height
during the climb
Aircraft
B738
Sky
SCT007 OVC025 TOPS042
A319 at 3,000 ft, 9 nm south, 3:17 am PDT (10:17 UTC): overcast above 3,000 ft, remarks: bases 3,000 ft tops 4,000 ft. 2036 nm along the route, 9 nm south of the line.
as filed, and in English
```
ROC UA /OV ROC220010/TM 1017/FL030/TP A319/SK 030 OVC/RM BASES 030 TOPS 040
```
Report
a routine report filed through ROC
Where
10 nm southwest (220°) of ROC
Time
10:17 UTC
Height
at 3,000 ft
Aircraft
A319
Sky
at 3,000 ft overcast
Remarks
bases 3,000 ft tops 4,000 ft
A21N at 35,000 ft, 31 nm south, 1:52 am PDT (08:52 UTC): light to moderate chop turbulence, remarks: zob. 2036 nm along the route, 31 nm south of the line.
as filed, and in English
```
ROC UA /OV GEE190015/TM 0852/FL350/TP A21N/TB LGHT-MOD CHOP/RM ZOB
```
Report
a routine report filed through ROC
Where
15 nm south (190°) of GEE
Time
08:52 UTC
Height
at 35,000 ft
Aircraft
A21N
Turbulence
lght-mod chop
Remarks
zob
CRJ9 at 2,000 ft, 12 nm north, 2:30 am PDT (09:30 UTC): a routine report with nothing remarked on. 2105 nm along the route, 12 nm north of the line.
as filed, and in English
```
SYR UA /OV 10S/TM 0930/FL020/TP CRJ9/SK B020-T060
```
Report
a routine report filed through SYR
Where
over 10S
Time
09:30 UTC
Height
at 2,000 ft
Aircraft
CRJ9
Sky
B020-T060
B738 at 38,000 ft, 9 nm north, 3:58 am PDT (10:58 UTC): light clear-air turbulence above 38,000 ft. 2145 nm along the route, 9 nm north of the line.
as filed, and in English
```
RME UA /OV UCA/TM 1058/FL380/TP B738/TB CONS LGT CAT 380
```
Report
a routine report filed through RME
Where
over UCA
Time
10:58 UTC
Height
at 38,000 ft
Aircraft
B738
Turbulence
continuous light clear-air turbulence at 38,000 ft
B737 at 6,700 ft, 4 nm east, 4:02 am PDT (11:02 UTC): a broken layer up to 6,700 ft; clear from 6,700 ft to 60,000 ft, remarks: during the climb. 2205 nm along the route, 4 nm east of the line.
as filed, and in English
```
ALB UA /OV ALB/TM 1102/FL067/TP B737/SK BKN-TOP067/SKC/RM DURC
```
Report
a routine report filed through ALB
Where
over ALB
Time
11:02 UTC
Height
at 6,700 ft
Aircraft
B737
Sky
BKN-TOP067 C
Remarks
during the climb
MULT at 36,000 ft, 19 nm north, 3:34 am PDT (10:34 UTC): light turbulence from 23,000 ft to 32,000 ft. 2225 nm along the route, 19 nm north of the line.
as filed, and in English
```
ALB UA /OV CAM/TM 1034/FL360/TP MULT/TB LGT 320-230
```
Report
a routine report filed through ALB
Where
over CAM
Time
10:34 UTC
Height
at 36,000 ft
Aircraft
MULT
Turbulence
light from 32,000 ft to 23,000 ft
B737 at 5,000 ft, 31 nm south, 4:02 am PDT (11:02 UTC): no turbulence, scattered clouds from 3,500 ft to 4,000 ft. At the destination end, 31 nm south of the line.
as filed, and in English
```
BDL UA /OV KBDL020007/TM 1102/FL050/TP B737/SK SCT 035 TOPS 040/TB SMOOTH
```
Report
a routine report filed through BDL
Where
7 nm north (020°) of KBDL
Time
11:02 UTC
Height
at 5,000 ft
Aircraft
B737
Sky
scattered clouds from 3,500 ft, tops 4,000 ft
Turbulence
smooth

7 more routine reports are on the map.

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 20 forecast points nearest it (SFO, SAC, RNO, BAM, ELY, SLC, RKS, BFF, ONL, FSD, MCW, LSE, GRB, MKG, CLE, BUF, SYR, ALB, BDL, BOS). 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	270° at 14 kt	−15 kt		135 kt	17 h 18 min	12:28 am EDT (04:28 UTC)
5,500 ft	270° at 14 kt	−14 kt	22 °C	134 kt	17 h 26 min	12:36 am EDT (04:36 UTC)
7,500 ft	260° at 15 kt	−16 kt	11 °C	136 kt	17 h 10 min	12:20 am EDT (04:20 UTC)
9,500 ft	260° at 17 kt	−18 kt	6 °C	138 kt	16 h 55 min	12:05 am EDT (04:05 UTC)
11,500 ft	250° at 20 kt	−21 kt	2 °C	141 kt	16 h 34 min	11:44 pm EDT (03:44 UTC)
13,500 ft	250° at 20 kt	−21 kt	-2 °C	141 kt	16 h 34 min	11:44 pm EDT (03:44 UTC)
15,500 ft	260° at 20 kt	−21 kt	-6 °C	141 kt	16 h 34 min	11:44 pm EDT (03:44 UTC)
17,500 ft	260° at 20 kt	−21 kt	-11 °C	141 kt	16 h 34 min	11:44 pm EDT (03:44 UTC)
18,000 ft FL180	260° at 19 kt	−21 kt	-12 °C	141 kt	16 h 34 min	11:44 pm EDT (03:44 UTC)
24,000 ft FL240	260° at 24 kt	−26 kt	-22 °C	146 kt	16 h	11:10 pm EDT (03:10 UTC)
30,000 ft FL300	260° at 33 kt	−35 kt	-34 °C	155 kt	15 h 04 min	10:14 pm EDT (02:14 UTC)
34,000 ft FL340	260° at 39 kt	−41 kt	-40 °C	161 kt	14 h 30 min	9:40 pm EDT (01:40 UTC)
39,000 ft FL390	270° at 42 kt	−46 kt	-47 °C	166 kt	14 h 04 min	9:14 pm EDT (01:14 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
SFO	used from 0 nm out; 34 nm from the line	090/9	050/12 4°	010/17 -2°	350/34 -3°	360/70 -11°	360/75 -22°	350/57 -38°	330/37 -42°	280/25 -44°
SAC	used from 50 nm out; 39 nm from the line	L/V	L/V 4°	340/9 -4°	340/22 -8°	360/71 -12°	360/82 -23°	350/58 -37°	310/30 -40°	270/25 -44°
RNO	used from 100 nm out; 59 nm from the line		010/6	270/12 -3°	220/26 -10°	280/13 -19°	350/44 -24°	320/30 -32°	260/22 -36°	240/24 -42°
BAM	used from 249 nm out; 71 nm from the line			280/9 -2°	260/18 -8°	190/47 -19°	200/50 -29°	210/56 -29°	220/54 -34°	220/45 -42°
ELY	used from 299 nm out; 49 nm from the line			210/34 1°	220/40 -4°	220/39 -17°	210/51 -24°	220/65 -30°	220/60 -37°	220/56 -44°
SLC	used from 449 nm out; 37 nm from the line		200/16	210/23 4°	220/34 -3°	210/40 -16°	220/66 -23°	220/64 -31°	220/57 -36°	220/50 -43°
RKS	used from 599 nm out; 32 nm from the line			250/9	230/21 -1°	210/43 -14°	220/59 -23°	220/55 -32°	220/53 -35°	220/48 -44°
BFF	used from 748 nm out; 121 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°
ONL	used from 998 nm out; 94 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°
FSD	used from 1147 nm out; 47 nm from the line	210/20	230/23 21°	220/25 14°	230/30 5°	230/26 -9°	240/30 -21°	270/33 -36°	260/47 -37°	270/58 -47°
MCW	used from 1297 nm out; 31 nm from the line	250/36	250/24 19°	240/26 11°	250/30 5°	270/22 -9°	260/30 -21°	260/31 -36°	280/53 -38°	280/66 -48°
LSE	used from 1397 nm out; 38 nm from the line	250/25	240/21 17°	240/28 11°	250/28 5°	280/24 -10°	280/31 -21°	260/35 -37°	270/45 -43°	280/59 -47°
GRB	used from 1547 nm out; 62 nm from the line	250/32	250/22 17°	240/18 8°	280/21 6°	280/34 -11°	280/35 -21°	280/39 -37°	270/52 -45°	290/60 -49°
MKG	used from 1597 nm out; 45 nm from the line	260/28	260/18 15°	250/16 9°	260/22 4°	280/31 -9°	270/35 -21°	270/44 -35°	270/42 -45°	290/61 -51°
CLE	used from 1796 nm out; 124 nm from the line	310/7	350/20 14°	340/16 9°	320/21 2°	320/32 -8°	330/34 -20°	330/45 -36°	320/60 -45°	320/64 -51°
BUF	used from 1896 nm out; 73 nm from the line	300/11	330/15 11°	340/26 8°	330/28 2°	340/31 -10°	340/32 -21°	340/52 -37°	340/59 -46°	330/66 -53°
SYR	used from 2046 nm out; 36 nm from the line	330/17	320/14 9°	350/18 8°	350/26 2°	340/25 -11°	360/34 -22°	350/43 -39°	330/50 -46°	350/50 -54°
ALB	used from 2145 nm out; 39 nm from the line	340/22	340/19 9°	320/16 7°	330/16 2°	330/19 -11°	320/21 -23°	320/25 -39°	280/30 -44°	270/41 -51°
BDL	used from 2245 nm out; 39 nm from the line	020/15	010/19 10°	340/10 7°	300/17 3°	280/23 -10°	250/35 -22°	250/44 -38°	250/55 -42°	250/57 -51°
BOS	used from 2295 nm out; 20 nm from the line	020/10	360/20 10°	340/19 7°	290/21 2°	270/35 -9°	260/42 -22°	250/55 -38°	240/75 -43°	250/72 -51°

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
OAK Oakland, CA	departure	VFR Sky: a few clouds at 2,000 feet	from the east (100°) at 5 knots	10+ mi	none	9 ft	3:53 am PDT (10:53 UTC)
SCK Stockton, CA	50 nm out, 9 nm south of the line, tower	VFR	from the northwest (310°) at 3 knots	10+ mi	none	32 ft	10:55 UTC
TMT Austin, NV	259 nm out, 10 nm northwest of the line	VFR Sky: overcast at 6,000 feet	calm	10+ mi	6,000 ft	5,735 ft	10:55 UTC
SLC Salt Lake City, UT	509 nm out, 8 nm north of the line, tower	VFR Sky: a few clouds at 4,000 feet, scattered clouds at 7,500 feet, a broken layer at 10,000 feet, a broken layer at 13,000 feet	from the south-southeast (150°) at 13 knots, gusting to 20	10+ mi	10,000 ft	4,230 ft	10:54 UTC
GUR Guernsey, WY	848 nm out, 11 nm north of the line, tower	VFR Sky: a broken layer at 14,000 feet, overcast at 17,000 feet	from the southeast (140°) at 3 knots	9 mi	14,000 ft	4,401 ft	10:55 UTC
ANW Ainsworth, NE	1058 nm out, 8 nm south of the line	low IFR Sky: overcast at 300 feet Weather: fog	from the north (010°) at 6 knots	0.5 mi	300 ft	2,588 ft	10:55 UTC
SPW Spencer, IA	1267 nm out, 4 nm east of the line	VFR	from the east (080°) at 4 knots	10+ mi	none	1,338 ft	10:53 UTC
MSN Madison, WI	1527 nm out, 19 nm south of the line, tower	VFR Sky: a broken layer at 22,000 feet	from the south (190°) at 7 knots	10+ mi	22,000 ft	886 ft	10:53 UTC
MBS Saginaw, MI	1756 nm out, 6 nm north of the line, tower	VFR Weather: mist	from the south-southwest (210°) at 6 knots	6 mi	none	668 ft	10:53 UTC
ROC Rochester, NY	2036 nm out, 2 nm east of the line, tower	marginal VFR Sky: a few clouds at 1,200 feet, overcast at 2,700 feet	from the southwest (230°) at 3 knots	10+ mi	2,700 ft	558 ft	10:54 UTC
ALB Albany, NY	2205 nm out, 4 nm east of the line, tower	low IFR Sky: a broken layer at 400 feet, overcast at 2,000 feet Weather: light drizzle, mist	calm	3 mi	400 ft	284 ft	10:51 UTC
BOS Boston, MA	destination	IFR Sky: overcast at 700 feet	from the north (360°) at 7 knots	10+ mi	700 ft	19 ft	6:54 am EDT (10:54 UTC)

The highest airport on this list sits at 5,735 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BOS when you get there the forecast at the estimated arrival, 9:14 pm EDT (01:14 UTC)

Wind from the northwest at 7 knots, visibility more than 6 miles, scattered clouds at 15,000 feet VFR

The whole forecast for BOS

From Mon 4:00 am EDT (08:00 UTC): wind from the north-northeast at 12 knots, visibility 6 miles, mist, overcast at 800 feet
From Mon 11:00 am EDT (15:00 UTC): wind from the north at 8 knots, visibility more than 6 miles, scattered clouds at 15,000 feet
From Mon 3:00 pm EDT (19:00 UTC): wind from the northwest at 7 knots, visibility more than 6 miles, scattered clouds at 15,000 feet
From Mon 11:00 pm EDT (03:00 UTC): wind from the northeast at 10 knots, visibility more than 6 miles, scattered clouds at 4,500 feet

The forecast for OAK, the departure

From Sun 11:00 pm PDT (06:00 UTC): wind from the south at 7 knots, visibility more than 6 miles, a few clouds at 1,500 feet
From Mon 2:00 am PDT (09:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, a few clouds at 1,500 feet
From Mon 11:00 am PDT (18:00 UTC): wind from the west at 8 knots, visibility more than 6 miles, clear skies

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

6/8802 Foxborough, MA, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 17 nm from the route, at the destination end · drones kept away from a public gathering · starts Saturday 17 October · ZBW

Daylight

Sunset at OAK 6:34 pm PDT (01:34 UTC), at BOS 6:07 pm EDT (22:07 UTC) (civil twilight ends 6:35 pm EDT (22:35 UTC)). At 120 knots the arrival at BOS is after sunset there (6:07 pm EDT (22:07 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: Oakland San Francisco Bay Airport, General Edward Lawrence Logan International.