Plan a flight · Sun 8:54 pm EDT (00:54 UTC)

Nantucket Memorial to Montgomery County Airpark ACK → GAI

349 nautical miles (401 statute miles) west on a straight line, true course 251°, about 265° magnetic at the departure end (variation 14W). At 120 knots that is 3 h 05 min at the quickest height in today's winds (4,500 ft, a 7-knot headwind), arriving about 11:59 pm EDT (03:59 UTC), after sunset at the destination. Right now ACK is marginal VFR, wind from the east (090°) at 17 knots, gusting to 25; GAI is low IFR, wind calm. 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: 4 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 E16E: thunderstorms (a convective SIGMET) up to 32,000 ft, moving from the southwest at 25 knots, until 8:55 pm EDT (00:55 UTC). Over the last 179 nm of the route.

as issued

WSUS31 KKCI 112355
MKCE WST 112355
CONVECTIVE SIGMET 16E
VALID UNTIL 0155Z
NY NJ PA DE MD VA DC WV AND NJ NY CSTL WTRS
FROM SAX-30SE JFK-10N DCA-60ENE EKN-SAX
AREA EMBD TS MOV FROM 22025KT. TOPS TO FL320.

AIRMET TANGO 2W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 319 nm of 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 329 nm of the route.
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, 269 nm along the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the last 10 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 ACK.

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

urgent CL60 at 800 ft, 46 nm north, 6:44 pm EDT (22:44 UTC): moderate chop turbulence, remarks: low-level wind shear +10/-10 during the descent onf runway 16. 159 nm along the route, 46 nm north of the line.
as filed, and in English
```
HPN UUA /OV HPN/TM 2244/FL008/TP CL60/TB MOD CHOP/RM LLWS +10/-10 DURD ONF RWY16
```
Report
an urgent report filed through HPN
Where
over HPN
Time
22:44 UTC
Height
at 800 ft
Aircraft
CL60
Turbulence
moderate chop
Remarks
low-level wind shear +10/-10 during the descent onf runway 16
urgent E55P at 100 ft, 46 nm north, 6:16 pm EDT (22:16 UTC): moderate chop turbulence, remarks: low-level wind shear +10/-10 knots during the descent on final runway 16. 159 nm along the route, 46 nm north of the line.
as filed, and in English
```
HPN UUA /OV HPN/TM 2216/FL001/TP E55P/TB MOD CHOP/RM LLWS +10/-10 KTS DURD ON FINAL RWY16
```
Report
an urgent report filed through HPN
Where
over HPN
Time
22:16 UTC
Height
at 100 ft
Aircraft
E55P
Turbulence
moderate chop
Remarks
low-level wind shear +10/-10 knots during the descent on final runway 16
BCS3 at 18,000 ft, 37 nm north, 8:17 pm EDT (00:17 UTC): moderate chop turbulence, remarks: moderate CHOP180-210 smooth above 22,000 ft. 30 nm along the route, 37 nm north of the line.
as filed, and in English
```
EWB UA /OV EWB/TM 0017/FL180/TP BCS3/TB MOD CHOP/RM MOD CHOP180-210 SMOOTH ABOVE FL220
```
Report
a routine report filed through EWB
Where
over EWB
Time
00:17 UTC
Height
at 18,000 ft
Aircraft
BCS3
Turbulence
moderate chop
Remarks
moderate CHOP180-210 smooth above 22,000 ft
BCS3 at 8,000 ft, 26 nm north, 6:58 pm EDT (22:58 UTC): moderate turbulence, remarks: during the descent. 100 nm along the route, 26 nm north of the line.
as filed, and in English
```
JPX UA /OV JPX360010/TM 2258/FL080/TP BCS3/TB MOD/RM DURD
```
Report
a routine report filed through JPX
Where
10 nm north (360°) of JPX
Time
22:58 UTC
Height
at 8,000 ft
Aircraft
BCS3
Turbulence
moderate
Remarks
during the descent
BCS3 at 4,000 ft, 32 nm northwest, 8:42 pm EDT (00:42 UTC): moderate turbulence, imc. 130 nm along the route, 32 nm northwest of the line.
as filed, and in English
```
BDR UA /OV BDR180010/TM 0042/FL040/TP BCS3/WX IMC/TB MOD
```
Report
a routine report filed through BDR
Where
10 nm south (180°) of BDR
Time
00:42 UTC
Height
at 4,000 ft
Aircraft
BCS3
Weather
instrument conditions
Turbulence
moderate
TBM9 descending, 21 nm north, 7:45 pm EDT (23:45 UTC): moderate turbulence, a broken layer above 700 ft. 140 nm along the route, 21 nm north of the line.
as filed, and in English
```
ISP UA /OV ISP/TM 2345/FLDURD/TP TBM9/SK BKN007/TB MOD
```
Report
a routine report filed through ISP
Where
over ISP
Time
23:45 UTC
Height
during the descent
Aircraft
TBM9
Sky
a broken layer from 700 ft
Turbulence
moderate
TBM9 descending, 21 nm north, 6:55 pm EDT (22:55 UTC): moderate turbulence, a broken layer above 700 ft. 140 nm along the route, 21 nm north of the line.
as filed, and in English
```
ISP UA /OV ISP/TM 2255/FLDURD/TP TBM9/SK BKN007/TB MOD
```
Report
a routine report filed through ISP
Where
over ISP
Time
22:55 UTC
Height
during the descent
Aircraft
TBM9
Sky
a broken layer from 700 ft
Turbulence
moderate
A32N , 22 nm northwest, 7:01 pm EDT (23:01 UTC): moderate turbulence. 169 nm along the route, 22 nm northwest of the line.
as filed, and in English
```
JFK UA /OV JFK10008/TM 2301/FL3000/TP A32N/TB MOD TURB
```
Report
a routine report filed through JFK
Where
JFK10008
Time
23:01 UTC
Height
at 300,000 ft
Aircraft
A32N
Turbulence
moderate turbulence
A333 at 3,000 ft, 5 nm east, 7:10 pm EDT (23:10 UTC): moderate turbulence. 179 nm along the route, 5 nm east of the line.
as filed, and in English
```
JFK UA /OV JFK180025/TM 2310/FL030/TP A333/TB MOD TURB
```
Report
a routine report filed through JFK
Where
25 nm south (180°) of JFK
Time
23:10 UTC
Height
at 3,000 ft
Aircraft
A333
Turbulence
moderate turbulence
B38M at 6,000 ft, 32 nm north, 8:47 pm EDT (00:47 UTC): moderate turbulence. 189 nm along the route, 32 nm north of the line.
as filed, and in English
```
EWR UA /OV 2 NW OF EWR/TM 0047/FL60/TP B38M/TB MODERATE
```
Report
a routine report filed through EWR
Where
2 northwest of ewr
Time
00:47 UTC
Height
at 6,000 ft
Aircraft
B38M
Turbulence
moderate
CRJ7 at 15,000 ft, 12 nm north, 8:07 pm EDT (00:07 UTC): moderate chop turbulence. 199 nm along the route, 12 nm north of the line.
as filed, and in English
```
BLM UA /OV COL/TM 0007/FL150/TP CRJ7/TB MOD CHOP
```
Report
a routine report filed through BLM
Where
over COL
Time
00:07 UTC
Height
at 15,000 ft
Aircraft
CRJ7
Turbulence
moderate chop
B38M at 25,000 ft, 6 nm north, 6:25 pm EDT (22:25 UTC): moderate turbulence. 239 nm along the route, 6 nm north of the line.
as filed, and in English
```
TEB UA /OV 3958N 07457W/TM 2225/FL250/TP B38M/TB MOD
```
Report
a routine report filed through TEB
Where
3958N 07457W
Time
22:25 UTC
Height
at 25,000 ft
Aircraft
B38M
Turbulence
moderate
A21N at 18,000 ft, 30 nm north, 8:38 pm EDT (00:38 UTC): moderate clear-air turbulence. 259 nm along the route, 30 nm north of the line.
as filed, and in English
```
PTW UA /OV PTW/TM 0038/FL180/TP A21N/TB MOD CAT
```
Report
a routine report filed through PTW
Where
over PTW
Time
00:38 UTC
Height
at 18,000 ft
Aircraft
A21N
Turbulence
moderate clear-air turbulence
E75L at 20,000 ft, 1 nm west, 8:41 pm EDT (00:41 UTC): moderate turbulence above 20,000 ft. 269 nm along the route, 1 nm west of the line.
as filed, and in English
```
ILG UA /OV DQO/TM 0041/FL200/TP E75L/TB MOD 200
```
Report
a routine report filed through ILG
Where
over DQO
Time
00:41 UTC
Height
at 20,000 ft
Aircraft
E75L
Turbulence
moderate at 20,000 ft

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 westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 3 forecast points nearest it (ACK, JFK, ACY). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
4,500 ft	180° at 21 kt	+7 kt		113 kt	3 h 05 min	11:59 pm EDT (03:59 UTC)
6,500 ft	200° at 24 kt	+14 kt	12 °C	106 kt	3 h 18 min	12:12 am EDT (04:12 UTC)
8,500 ft	220° at 26 kt	+22 kt	11 °C	98 kt	3 h 34 min	12:28 am EDT (04:28 UTC)
10,500 ft	230° at 29 kt	+27 kt	7 °C	93 kt	3 h 45 min	12:39 am EDT (04:39 UTC)
12,500 ft	240° at 31 kt	+30 kt	4 °C	90 kt	3 h 53 min	12:47 am EDT (04:47 UTC)
14,500 ft	240° at 35 kt	+34 kt	0 °C	86 kt	4 h 03 min	12:57 am EDT (04:57 UTC)
16,500 ft	240° at 38 kt	+37 kt	-4 °C	83 kt	4 h 12 min	1:06 am EDT (05:06 UTC)
18,000 ft FL180	240° at 41 kt	+40 kt	-7 °C	80 kt	4 h 22 min	1:16 am EDT (05:16 UTC)
24,000 ft FL240	240° at 50 kt	+49 kt	-17 °C	71 kt	4 h 55 min	1:49 am EDT (05:49 UTC)
30,000 ft FL300	230° at 69 kt	+67 kt	-31 °C	53 kt	6 h 35 min	3:29 am EDT (07:29 UTC)
34,000 ft FL340	240° at 76 kt	+74 kt	-41 °C	46 kt	7 h 35 min	4:29 am EDT (08:29 UTC)
39,000 ft FL390	240° at 86 kt	+83 kt	-54 °C	37 kt	9 h 26 min	6:20 am EDT (10:20 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
ACK	used from 0 nm out; 25 nm from the line	150/19	170/30 8°	210/31 9°	230/42 3°	250/44 -7°	250/50 -17°	240/62 -32°	250/71 -42°	250/86 -55°
JFK	used from 100 nm out; 52 nm from the line	140/43	170/35 13°	230/18 9°	250/25 5°	240/40 -7°	230/50 -17°	230/75 -31°	230/78 -41°	230/88 -53°
ACY	used from 199 nm out; 31 nm from the line	230/15	230/22 15°	230/31 11°	230/27 6°	230/40 -7°	230/51 -17°	230/71 -31°	230/81 -41°	230/86 -53°

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
ACK Nantucket, MA	departure	marginal VFR Sky: a few clouds at 4,500 feet, overcast at 6,500 feet Weather: rain, mist	from the east (090°) at 17 knots, gusting to 25	5 mi	6,500 ft	46 ft	7:53 pm EDT (23:53 UTC)
MVY Vineyard Haven, MA	20 nm out, 16 nm north of the line, tower	IFR Sky: a broken layer at 800 feet, overcast at 1,500 feet Weather: light rain	from the east (100°) at 10 knots, gusting to 21	10+ mi	800 ft	66 ft	23:57 UTC
MTP Montauk, NY	80 nm out, 18 nm northwest of the line	reported, no category	from the east-northeast (060°) at 10 knots, gusting to 26		none	6 ft	23:54 UTC
FOK Westhampton Beach, NY	120 nm out, 16 nm north of the line, tower	IFR Sky: overcast at 700 feet Weather: light rain, mist	from the east-northeast (070°) at 8 knots, gusting to 24	2 mi	700 ft	66 ft	00:35 UTC
ISP New York, NY	140 nm out, 21 nm north of the line, tower	IFR Sky: a broken layer at 700 feet, overcast at 1,200 feet Weather: light rain, mist	from the northeast (050°) at 13 knots, gusting to 21	3 mi	700 ft	98 ft	23:56 UTC
BLM Belmar/Farmingdale, NJ	199 nm out, 5 nm northeast of the line	low IFR Sky: overcast at 400 feet Weather: light rain	from the north-northeast (030°) at 10 knots	2 mi	400 ft	153 ft	00:41 UTC
PHL Philadelphia, PA	249 nm out, 5 nm northwest of the line, tower	IFR Sky: a broken layer at 600 feet, a broken layer at 900 feet, overcast at 2,600 feet Weather: light rain, mist	from the northeast (040°) at 9 knots	3 mi	600 ft	35 ft	00:03 UTC
ILG Wilmington, DE	269 nm out, 1 nm west of the line, tower	IFR Sky: overcast at 500 feet Weather: rain	from the north-northeast (030°) at 14 knots	4 mi	500 ft	79 ft	23:51 UTC
MTN Baltimore, MD	309 nm out, 6 nm south of the line, tower	IFR Sky: overcast at 500 feet	calm	4 mi	500 ft	22 ft	00:45 UTC
GAI Gaithersburg, MD	destination	low IFR Sky: overcast at 300 feet Weather: mist	calm	6 mi	300 ft	538 ft	8:12 pm EDT (00:12 UTC)

The highest airport on this list sits at 538 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At GAI when you get there the forecast at the estimated arrival, 11:59 pm EDT (03:59 UTC)

GAI has no terminal forecast; use the nearest airport that does.

The forecast for ACK, the departure

From Sun 8:00 pm EDT (00:00 UTC): wind from the east at 11 knots, visibility more than 6 miles, light rain, a few clouds at 2,400 feet, scattered clouds at 3,500 feet and more above
From Sun 10:00 pm EDT (02:00 UTC): wind from the east at 14 knots, gusting to 24, visibility 2 miles, rain, mist, overcast at 1,000 feet
From Mon 1:00 am EDT (05:00 UTC): wind from the east at 16 knots, gusting to 23, visibility 3 miles, rain, mist, overcast at 300 feet
From Mon 3:00 am EDT (07:00 UTC): wind from the east-northeast at 15 knots, visibility 1 mile, light rain showers, mist, overcast at 300 feet
From Mon 5:00 am EDT (09:00 UTC): wind from the north-northeast at 15 knots, visibility ¾ mile, mist, overcast at 300 feet
30% chance between Mon 5:00 am EDT (09:00 UTC) and 6:00 am EDT (10:00 UTC): visibility ¾ mile, light rain showers, mist, overcast at 100 feet
From Mon 11:00 am EDT (15:00 UTC): wind from the north-northeast at 15 knots, visibility more than 6 miles, a broken layer at 800 feet
From Mon 4:00 pm EDT (20:00 UTC): wind from the north at 13 knots, gusting to 21, visibility more than 6 miles, scattered clouds at 3,000 feet

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

6/8800 Baltimore, MD, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 5 nm from the route, 319 nm along the route · drones kept away from a public gathering · starts Saturday 17 October · ZDC
4/9383 WASHINGTON, DC., USA 4 nm from the route, at the destination end · security · ZDC
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 5 nm from the route, at the destination end · a VIP movement · today · ZDC

Daylight

Sunset at ACK 6:04 pm EDT (22:04 UTC), at GAI 6:34 pm EDT (22:34 UTC) (civil twilight ends 7:01 pm EDT (23:01 UTC)). At 120 knots the arrival at GAI is before sunrise there (7:15 am EDT (11:15 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 Northeast · 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: Nantucket Memorial, Montgomery County Airpark.