Plan a flight · Mon 6:09 am PDT (13:09 UTC)

Ontario International to General Edward Lawrence Logan International ONT → BOS

2,225 nautical miles (2,561 statute miles) northeast on a straight line, true course 063°, about 051° magnetic at the departure end (variation 12E). At 120 knots that is 12 h 30 min at the quickest height in today's winds (34,000 ft, a 58-knot tailwind), arriving about 9:39 pm EDT (01:39 UTC), after sunset at the destination. Right now ONT is marginal VFR, wind from the west-southwest (240°) at 6 knots; BOS is IFR, wind from the north (350°) at 5 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: 206 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 TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 12,000 ft. Over the first 439 nm of the route.
AIRMET SIERRA 2E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the first 40 nm of the route.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 200 to 479 nm out.
AIRMET SIERRA 2E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 210 to 309 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 279 to 738 nm out.
AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the route from 459 to 689 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 639 to 728 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 878 to 1337 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 629 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 33,000 ft. Over the last 359 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 1896 to 2135 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 ONT.

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

C172 at 9,500 ft, 27 nm north, 5:43 am PDT (12:43 UTC): moderate chop turbulence. 689 nm along the route, 27 nm north of the line.
as filed, and in English
```
COS UA /OV BRK348/005/TM 1243/FL095/TP C172/TB TB MOD CHOP
```
Report
a routine report filed through COS
Where
BRK348/005
Time
12:43 UTC
Height
at 9,500 ft
Aircraft
C172
Turbulence
turbulence moderate chop
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
A333 descending, 0 nm southwest, 4:05 am PDT (11:05 UTC): overcast from 1,500 ft to 7,000 ft, remarks: during the descent runway 26R. At the departure end, 0 nm southwest of the line.
as filed, and in English
```
ONT UA /OV ONT080/TM 1105/FLUNKN/TP A333/SK OVC015 - TOP070/RM DURD RY26R
```
Report
a routine report filed through ONT
Where
ONT080
Time
11:05 UTC
Height
height not given
Aircraft
A333
Sky
overcast from 1,500 ft, tops 7,000 ft
Remarks
during the descent runway 26R
B763 at 2,800 ft, 6 nm southwest, 5:05 am PDT (12:05 UTC): overcast from 1,500 ft to 6,000 ft, remarks: during the descent runway 26R. At the departure end, 6 nm southwest of the line.
as filed, and in English
```
ONT UA /OV ONT080006/TM 1205/FL028/TP B763/SK OVC015-TOP060/RM DURD RY26R
```
Report
a routine report filed through ONT
Where
6 nm east (080°) of ONT
Time
12:05 UTC
Height
at 2,800 ft
Aircraft
B763
Sky
overcast from 1,500 ft, tops 6,000 ft
Remarks
during the descent runway 26R
A359 at 38,000 ft, 22 nm northwest, 3:13 am PDT (10:13 UTC): light chop turbulence, remarks: ZDVWC-37. 569 nm along the route, 22 nm northwest of the line.
as filed, and in English
```
GUC UA /OV HBU185015/TM 1013/FL380/TP A359/TB CONS LGT CHOP/RM ZDVWC-37
```
Report
a routine report filed through GUC
Where
15 nm south (185°) of HBU
Time
10:13 UTC
Height
at 38,000 ft
Aircraft
A359
Turbulence
continuous light chop
Remarks
ZDVWC-37
B737 at 13,000 ft, 16 nm northwest, 6:00 am PDT (13:00 UTC): light turbulence. 689 nm along the route, 16 nm northwest of the line.
as filed, and in English
```
COS UA /OV BRK082/11/TM 1300/FL130/TP B737/TB TB LGT
```
Report
a routine report filed through COS
Where
BRK082/11
Time
13:00 UTC
Height
at 13,000 ft
Aircraft
B737
Turbulence
turbulence light
B738 at 11,000 ft, 10 nm northwest, 4:42 am PDT (11:42 UTC): light chop turbulence, remarks: during the climb. 689 nm along the route, 10 nm northwest of the line.
as filed, and in English
```
COS UA /OV BRK172014/TM 1142/FL110/TP B738/TB LGT CHOP/RM DURC
```
Report
a routine report filed through COS
Where
14 nm south (172°) of BRK
Time
11:42 UTC
Height
at 11,000 ft
Aircraft
B738
Turbulence
light chop
Remarks
during the climb
B737 at 17,000 ft, 39 nm northwest, 5:24 am PDT (12:24 UTC): no turbulence, no icing, vfr; clear up to 60,000 ft, remarks: not bad for denver. 698 nm along the route, 39 nm northwest of the line.
as filed, and in English
```
DEN UA /OV DEN170035/TM 1224/FL170/TP B737/SK VFR/WX SKC/TA UNK/TB NEG/IC NEG/RM NOT BAD FOR DENVER
```
Report
a routine report filed through DEN
Where
35 nm south (170°) of DEN
Time
12:24 UTC
Height
at 17,000 ft
Aircraft
B737
Sky
vfr
Weather
clear sky
Temperature
UNK
Turbulence
none
Icing
none
Remarks
not bad for denver
B38M at 39,000 ft, 43 nm north, 5:43 am PDT (12:43 UTC): light chop turbulence. 968 nm along the route, 43 nm north of the line.
as filed, and in English
```
HSI UA /OV HSI270030/TM 1243/FL390/TP B38M/TB CONS LGT CHOP
```
Report
a routine report filed through HSI
Where
30 nm west (270°) of HSI
Time
12:43 UTC
Height
at 39,000 ft
Aircraft
B38M
Turbulence
continuous light chop
B38M at 17,000 ft, 31 nm north, 5:41 am PDT (12:41 UTC): no turbulence, remarks: during the climb. 1068 nm along the route, 31 nm north of the line.
as filed, and in English
```
LNK UA /OV LNK/TM 1241/FL170/TP B38M/TB NEG/RM DURC
```
Report
a routine report filed through LNK
Where
over LNK
Time
12:41 UTC
Height
at 17,000 ft
Aircraft
B38M
Turbulence
none
Remarks
during the climb
B38M at 18,000 ft, 22 nm south, 6:04 am PDT (13:04 UTC): light chop turbulence. 1148 nm along the route, 22 nm south of the line.
as filed, and in English
```
EVU UA /OV EVU/TM 1304/FL180/TP B38M/TB CONS LGT CHOP
```
Report
a routine report filed through EVU
Where
over EVU
Time
13:04 UTC
Height
at 18,000 ft
Aircraft
B38M
Turbulence
continuous light chop
A321 at 32,000 ft, 48 nm north, 5:25 am PDT (12:25 UTC): light chop turbulence. 1307 nm along the route, 48 nm north of the line.
as filed, and in English
```
CID UA /OV CID360010/TM 1225/FL320/TP A321/TB INTMT LGT CHOP CONS LGT CHOP
```
Report
a routine report filed through CID
Where
10 nm north (360°) of CID
Time
12:25 UTC
Height
at 32,000 ft
Aircraft
A321
Turbulence
intermittent light chop continuous light chop
CRJ9 at 38,000 ft, 32 nm south, 4:06 am PDT (11:06 UTC): no turbulence. 1527 nm along the route, 32 nm south of the line.
as filed, and in English
```
OXI UA /OV OXI/TM 1106/FL380/TP CRJ9/TB NEG
```
Report
a routine report filed through OXI
Where
over OXI
Time
11:06 UTC
Height
at 38,000 ft
Aircraft
CRJ9
Turbulence
none
A320 at 36,000 ft, 25 nm south, 4:25 am PDT (11:25 UTC): no turbulence. 1557 nm along the route, 25 nm south of the line.
as filed, and in English
```
GSH UA /OV GSH/TM 1125/FL360/TP A320/TB NEG
```
Report
a routine report filed through GSH
Where
over GSH
Time
11:25 UTC
Height
at 36,000 ft
Aircraft
A320
Turbulence
none

16 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 21 forecast points nearest it (ONT, LAS, PRC, BCE, FMN, ALS, PUB, GLD, GRI, OMA, DSM, BRL, DBQ, JOT, FWA, 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 17 kt	−18 kt		138 kt	16 h 07 min	1:16 am EDT (05:16 UTC)
5,500 ft	270° at 17 kt	−18 kt	16 °C	138 kt	16 h 07 min	1:16 am EDT (05:16 UTC)
7,500 ft	260° at 17 kt	−18 kt	11 °C	138 kt	16 h 07 min	1:16 am EDT (05:16 UTC)
9,500 ft	260° at 16 kt	−18 kt	8 °C	138 kt	16 h 07 min	1:16 am EDT (05:16 UTC)
11,500 ft	250° at 19 kt	−21 kt	4 °C	141 kt	15 h 47 min	12:56 am EDT (04:56 UTC)
13,500 ft	250° at 22 kt	−24 kt	0 °C	144 kt	15 h 27 min	12:36 am EDT (04:36 UTC)
15,500 ft	250° at 24 kt	−26 kt	-4 °C	146 kt	15 h 14 min	12:23 am EDT (04:23 UTC)
17,500 ft	250° at 26 kt	−29 kt	-9 °C	149 kt	14 h 56 min	12:05 am EDT (04:05 UTC)
18,000 ft FL180	250° at 27 kt	−30 kt	-10 °C	150 kt	14 h 50 min	11:59 pm EDT (03:59 UTC)
24,000 ft FL240	250° at 36 kt	−39 kt	-21 °C	159 kt	14 h	11:09 pm EDT (03:09 UTC)
30,000 ft FL300	250° at 46 kt	−50 kt	-33 °C	170 kt	13 h 05 min	10:14 pm EDT (02:14 UTC)
34,000 ft FL340	260° at 55 kt	−58 kt	-39 °C	178 kt	12 h 30 min	9:39 pm EDT (01:39 UTC)
39,000 ft FL390	260° at 53 kt	−57 kt	-48 °C	177 kt	12 h 34 min	9:43 pm EDT (01:43 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
ONT	used from 0 nm out; 25 nm from the line	250/11	200/20 4°	210/27 3°	220/26 -4°	240/32 -13°	220/52 -21°	220/67 -30°	220/72 -37°	220/65 -46°
LAS	used from 100 nm out; 67 nm from the line		210/20 8°	210/29 4°	200/32 -3°	200/51 -15°	210/64 -21°	220/70 -30°	220/66 -38°	220/55 -44°
PRC	used from 200 nm out; 82 nm from the line			200/37 6°	200/35 0°	220/60 -11°	220/71 -20°	220/88 -29°	220/98 -35°	220/94 -45°
BCE	used from 299 nm out; 84 nm from the line				200/32 -2°	210/57 -15°	220/71 -22°	220/69 -30°	220/64 -38°	220/67 -44°
FMN	used from 399 nm out; 73 nm from the line			220/16 6°	220/39 1°	220/50 -10°	230/67 -23°	230/94 -29°	230/102 -35°	230/90 -46°
ALS	used from 549 nm out; 53 nm from the line				240/35 3°	230/54 -9°	240/66 -19°	230/85 -26°	240/87 -34°	240/70 -47°
PUB	used from 649 nm out; 19 nm from the line			260/45 11°	240/38 6°	230/47 -8°	230/51 -19°	240/74 -29°	240/82 -35°	250/72 -48°
GLD	used from 748 nm out; 55 nm from the line		260/37	260/25 14°	250/27 8°	230/36 -8°	230/49 -21°	250/71 -30°	260/82 -36°	250/73 -48°
GRI	used from 948 nm out; 60 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°
OMA	used from 1048 nm out; 61 nm from the line	230/47	240/33 21°	230/22 13°	220/27 5°	240/35 -8°	250/43 -21°	260/47 -33°	260/59 -36°	270/58 -46°
DSM	used from 1148 nm out; 55 nm from the line	250/47	260/25 20°	240/19 11°	240/31 5°	250/26 -9°	260/38 -20°	260/47 -34°	270/58 -37°	270/61 -47°
BRL	used from 1247 nm out; 57 nm from the line	250/32	250/19 17°	260/15 11°	270/16 3°	290/23 -7°	260/42 -20°	270/52 -34°	280/63 -39°	290/64 -48°
DBQ	used from 1347 nm out; 62 nm from the line	250/27	260/23 17°	240/26 10°	260/30 4°	280/26 -9°	280/36 -21°	270/41 -36°	280/52 -41°	290/67 -48°
JOT	used from 1397 nm out; 38 nm from the line	250/25	260/22 14°	250/17 9°	270/21 5°	280/28 -8°	280/36 -20°	270/41 -35°	280/57 -42°	290/65 -50°
FWA	used from 1547 nm out; 63 nm from the line	270/20	300/16 15°	290/14 10°	280/17 3°	290/25 -7°	280/30 -19°	280/34 -35°	290/48 -44°	300/64 -52°
CLE	used from 1646 nm out; 85 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 1796 nm out; 71 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 1946 nm out; 50 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 2046 nm out; 36 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 2145 nm out; 34 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 2195 nm out; 15 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
ONT Ontario, CA	departure	marginal VFR Sky: scattered clouds at 900 feet, a broken layer at 1,400 feet, overcast at 3,000 feet Weather: light rain	from the west-southwest (240°) at 6 knots	7 mi	1,400 ft	944 ft	5:53 am PDT (12:53 UTC)
SBD San Bernardino, CA	20 nm out, 7 nm south of the line, tower	marginal VFR Sky: overcast at 1,500 feet	calm	10+ mi	1,500 ft	1,159 ft	12:40 UTC
GCN Grand Canyon, AZ	289 nm out, 13 nm southeast of the line, tower	IFR Sky: a few clouds at 700 feet, a few clouds at 1,300 feet, overcast at 3,500 feet Weather: mist	variable at 3 knots	2.5 mi	3,500 ft	6,608 ft	12:54 UTC
CEZ Cortez, CO	479 nm out, 4 nm south of the line	VFR Sky: a broken layer at 7,000 feet	calm	10+ mi	7,000 ft	5,917 ft	12:53 UTC
COS Colorado Springs, CO	689 nm out, 16 nm northwest of the line, tower	VFR Sky: a few clouds at 10,000 feet	from the east (090°) at 6 knots	10+ mi	none	6,187 ft	12:54 UTC
AFK Nebraska City, NE	1108 nm out, 3 nm northwest of the line	VFR	from the south-southwest (200°) at 11 knots	10+ mi	none	1,165 ft	12:55 UTC
ICL Clarinda, IA	1148 nm out, 3 nm west of the line	VFR	from the south (180°) at 7 knots	10+ mi	none	995 ft	12:55 UTC
MDW Chicago, IL	1477 nm out, 3 nm northeast of the line, tower	VFR Sky: a few clouds at 20,000 feet, scattered clouds at 25,000 feet	from the south-southwest (210°) at 7 knots	10+ mi	none	619 ft	12:53 UTC
DTW Detroit, MI	1676 nm out, 3 nm north of the line, tower	low IFR Sky: overcast at 400 feet Weather: mist	from the southwest (220°) at 11 knots	2 mi	400 ft	645 ft	12:53 UTC
ITH Ithaca, NY	1986 nm out, 4 nm northwest of the line, tower	low IFR Sky: overcast at 300 feet Weather: mist	from the west-northwest (300°) at 4 knots	4 mi	300 ft	1,099 ft	12:56 UTC
ORH Worcester, MA	2185 nm out, 8 nm south of the line, tower	VFR Sky: scattered clouds at 400 feet	from the north-northeast (020°) at 8 knots	10+ mi	none	1,009 ft	12:54 UTC
BOS Boston, MA	destination	IFR Sky: overcast at 700 feet	from the north (350°) at 5 knots	10+ mi	700 ft	19 ft	9:01 am EDT (13:01 UTC)

The highest airport on this list sits at 6,608 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, 9:39 pm EDT (01:39 UTC)

Wind from the north at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 feet VFR

The whole forecast for BOS

From Mon 8:00 am EDT (12:00 UTC): wind from the north at 9 knots, visibility 6 miles, mist, overcast at 600 feet
From Mon 10:00 am EDT (14:00 UTC): wind from the north at 9 knots, visibility more than 6 miles, overcast at 1,500 feet
From Mon 1:00 pm EDT (17:00 UTC): wind from the north at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 feet
At times between Mon 1:00 pm EDT (17:00 UTC) and 3:00 pm EDT (19:00 UTC): a broken layer at 3,000 feet
From Tue 12:00 am EDT (04:00 UTC): wind from the northeast at 10 knots, visibility more than 6 miles, overcast at 3,000 feet
From Tue 6:00 am EDT (10:00 UTC): wind from the east-northeast at 10 knots, visibility more than 6 miles, light rain, overcast at 800 feet

The forecast for ONT, the departure

From Mon 5:00 am PDT (12:00 UTC): wind light and variable, visibility more than 6 miles, light rain showers, scattered clouds at 2,000 feet, a broken layer at 3,000 feet
At times between Mon 5:00 am PDT (12:00 UTC) and 9:00 am PDT (16:00 UTC): visibility 5 miles, mist, a broken layer at 1,800 feet
From Mon 9:00 am PDT (16:00 UTC): wind from the southwest at 5 knots, visibility more than 6 miles, showers nearby, scattered clouds at 2,500 feet, a broken layer at 3,500 feet
From Mon 1:00 pm PDT (20:00 UTC): wind from the west-southwest at 11 knots, visibility more than 6 miles, showers nearby, scattered clouds at 2,500 feet, a broken layer at 3,500 feet
From Mon 8:00 pm PDT (03:00 UTC): wind from the west at 8 knots, visibility more than 6 miles, scattered clouds at 3,000 feet, a broken layer at 4,000 feet
From Mon 11:00 pm PDT (06:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 3,000 feet, scattered clouds at 4,000 feet

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

4/3635 DISNEYLAND THEME PARK, ANAHEIM,, CA 19 nm from the route, at the departure end · security · ZLA
6/8891 Bullhead City, AZ, Wednesday, October 14, 2026 Local on the route, 160 nm along the route · a VIP movement · starts Wednesday 14 October · ZLA
6/8992 Monroe, MI, Thursday, October 15, 2026 Local 8 nm from the route, 1676 nm along the route · a VIP movement · starts Thursday 15 October · ZOB
6/8802 Foxborough, MA, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 16 nm from the route, at the destination end · drones kept away from a public gathering · starts Saturday 17 October · ZBW

Daylight

Sunset at ONT 6:18 pm PDT (01:18 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: Ontario International, General Edward Lawrence Logan International.