Plan a flight · Mon 8:19 am EDT (12:19 UTC)

Long Island Mac Arthur Airport to Montgomery County Airpark ISP → GAI

211 nautical miles (243 statute miles) southwest on a straight line, true course 244°, about 258° magnetic at the departure end (variation 14W). At 120 knots that is 1 h 41 min at the quickest height in today's winds (4,500 ft, a 5-knot tailwind), arriving about 10:00 am EDT (14:00 UTC). Right now ISP is IFR, wind from the north-northeast (020°) at 11 knots; GAI is VFR, 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: 2 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 E38E: thunderstorms (a convective SIGMET) up to 32,000 ft, moving from the northwest at 20 knots, until 9:55 am EDT (13:55 UTC). Near the route, 144 nm along the route.

as issued

WSUS31 KKCI 121155
MKCE WST 121155
CONVECTIVE SIGMET 38E
VALID UNTIL 1355Z
NJ DE MD VA AND CSTL WTRS
FROM 50WNW SIE-20E SIE-30NNE ORF-20NE RIC-50WNW SIE
AREA TS MOV FROM 33020KT. TOPS TO FL320.

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 whole route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 33,000 ft. Over the whole 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 ISP.

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

urgent SF50 descending, 27 nm north, 6:50 am EDT (10:50 UTC): light turbulence, overcast above 1,200 ft, remarks: during the descent runway 5. 58 nm along the route, 27 nm north of the line.
as filed, and in English
```
MMU UUA /OV MMU/TM 1050/FLDURD/TP SF50/SK OVC012/TB LGT/RM DURD RWY 5
```
Report
an urgent report filed through MMU
Where
over MMU
Time
10:50 UTC
Height
during the descent
Aircraft
SF50
Sky
overcast from 1,200 ft
Turbulence
light
Remarks
during the descent runway 5
E170 at 29,000 ft, 33 nm southeast, 6:58 am EDT (10:58 UTC): moderate turbulence from 19,000 ft to 29,000 ft. 144 nm along the route, 33 nm southeast of the line.
as filed, and in English
```
DOV UA /OV ENO/TM 1058/FLF290/TP E170/TB MOD 290-190
```
Report
a routine report filed through DOV
Where
over ENO
Time
10:58 UTC
Height
at F290
Aircraft
E170
Turbulence
moderate from 29,000 ft to 19,000 ft
E170 at 23,000 ft, 33 nm southeast, 6:28 am EDT (10:28 UTC): moderate turbulence above 23,000 ft. 144 nm along the route, 33 nm southeast of the line.
as filed, and in English
```
DOV UA /OV ENO/TM 1028/FLF230/TP E170/TB MOD 230
```
Report
a routine report filed through DOV
Where
over ENO
Time
10:28 UTC
Height
at F230
Aircraft
E170
Turbulence
moderate at 23,000 ft
E75S at 15,000 ft, 5 nm southeast, 6:35 am EDT (10:35 UTC): moderate turbulence, remarks: dca arrival from 12,000 ft to 15,000 ft during the descent. 163 nm along the route, 5 nm southeast of the line.
as filed, and in English
```
BWI UA /OV BAL060030/TM 1035/FL150/TP E75S/TB MOD/RM DCA ARRIVAL 120-150 DURD
```
Report
a routine report filed through BWI
Where
30 nm northeast (060°) of BAL
Time
10:35 UTC
Height
at 15,000 ft
Aircraft
E75S
Turbulence
moderate
Remarks
dca arrival from 12,000 ft to 15,000 ft during the descent
PC12 descending, 21 nm east, 7:55 am EDT (11:55 UTC): overcast above 800 ft. At the departure end, 21 nm east of the line.
as filed, and in English
```
FOK UA /OV FOK/TM 1155/FLDURD/TP PC12/SK OVC008
```
Report
a routine report filed through FOK
Where
over FOK
Time
11:55 UTC
Height
during the descent
Aircraft
PC12
Sky
overcast from 800 ft
PC12 at 2,500 ft, 0 nm southwest, 7:51 am EDT (11:51 UTC): remarks: dur D. At the departure end, 0 nm southwest of the line.
as filed, and in English
```
ISP UA /OV ISP 090 070/TM 1151/FL025/TP PC12/SK TOPS 025/RM DUR D
```
Report
a routine report filed through ISP
Where
isp at 9,000 ft at 7,000 ft
Time
11:51 UTC
Height
at 2,500 ft
Aircraft
PC12
Sky
tops 2,500 ft
Remarks
dur D
C172 , 39 nm northwest, 7:38 am EDT (11:38 UTC): overcast above 1,100 ft. At the departure end, 39 nm northwest of the line.
as filed, and in English
```
DXR UA /OV KDXR/TM 1138/FL000/TP C172/SK OVC011
```
Report
a routine report filed through DXR
Where
over KDXR
Time
11:38 UTC
Height
at 0 ft
Aircraft
C172
Sky
overcast from 1,100 ft
B737 climbing, 0 nm southwest, 6:05 am EDT (10:05 UTC): a routine report with nothing remarked on. At the departure end, 0 nm southwest of the line.
as filed, and in English
```
ISP UA /OV ISP/TM 1005/FLDURC/TP B737/SK BASES 009
```
Report
a routine report filed through ISP
Where
over ISP
Time
10:05 UTC
Height
during the climb
Aircraft
B737
Sky
bases 900 ft
PC12 at 2,300 ft, 22 nm northwest, 7:13 am EDT (11:13 UTC): no turbulence, overcast from 700 ft to 2,300 ft. 10 nm along the route, 22 nm northwest of the line.
as filed, and in English
```
HPN UA /OV HPN130006/TM 1113/FL023/TP PC12/SK OVC007-TOP023/TB NEG
```
Report
a routine report filed through HPN
Where
6 nm southeast (130°) of HPN
Time
11:13 UTC
Height
at 2,300 ft
Aircraft
PC12
Sky
overcast from 700 ft, tops 2,300 ft
Turbulence
none
E175 descending, 15 nm northwest, 7:50 am EDT (11:50 UTC): remarks: base 80,000 ft feet. 29 nm along the route, 15 nm northwest of the line.
as filed, and in English
```
LGA UA /OV FINAL RWY 04/TM 1150/FLDURD/TP E175/RM BASE 800 FEET
```
Report
a routine report filed through LGA
Where
final runway 04
Time
11:50 UTC
Height
during the descent
Aircraft
E175
Remarks
base 80,000 ft feet
E175 descending, 15 nm northwest, 6:51 am EDT (10:51 UTC): remarks: base 80,000 ft feet. 29 nm along the route, 15 nm northwest of the line.
as filed, and in English
```
LGA UA /OV FINAL RWY 04/TM 1051/FLDURD/TP E175/RM BASE 800 FEET
```
Report
a routine report filed through LGA
Where
final runway 04
Time
10:51 UTC
Height
during the descent
Aircraft
E175
Remarks
base 80,000 ft feet
A320 climbing, 2 nm southwest, 6:42 am EDT (10:42 UTC): a routine report with nothing remarked on. 29 nm along the route, 2 nm southwest of the line.
as filed, and in English
```
JFK UA /OV JFK150005/TM 1042/FLDURC/TP A320/SK 010-TOP024
```
Report
a routine report filed through JFK
Where
5 nm southeast (150°) of JFK
Time
10:42 UTC
Height
during the climb
Aircraft
A320
Sky
010-TOP024
A321 at 1,000 ft, 6 nm north, 7:57 am EDT (11:57 UTC): overcast above 1,000 ft. 38 nm along the route, 6 nm north of the line.
as filed, and in English
```
JFK UA /OV KJFK225003/TM 1157/FL010/TP A321/SK OVC010
```
Report
a routine report filed through JFK
Where
3 nm southwest (225°) of KJFK
Time
11:57 UTC
Height
at 1,000 ft
Aircraft
A321
Sky
overcast from 1,000 ft
CRJ9 at 3,200 ft, 11 nm southeast, 7:55 am EDT (11:55 UTC): a routine report with nothing remarked on. 38 nm along the route, 11 nm southeast of the line.
as filed, and in English
```
JFK UA /OV JFK180016/TM 1155/FL032/TP CRJ9/SK TOPS 032
```
Report
a routine report filed through JFK
Where
16 nm south (180°) of JFK
Time
11:55 UTC
Height
at 3,200 ft
Aircraft
CRJ9
Sky
tops 3,200 ft

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 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 (JFK, ACY, RIC). 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	350° at 14 kt	−5 kt		125 kt	1 h 41 min	10:00 am EDT (14:00 UTC)
6,500 ft	320° at 11 kt	+2 kt	11 °C	118 kt	1 h 47 min	10:06 am EDT (14:06 UTC)
8,500 ft	320° at 13 kt	+2 kt	8 °C	118 kt	1 h 47 min	10:06 am EDT (14:06 UTC)
10,500 ft	330° at 14 kt	+1 kt	5 °C	119 kt	1 h 46 min	10:05 am EDT (14:05 UTC)
12,500 ft	330° at 15 kt	+2 kt	2 °C	118 kt	1 h 47 min	10:06 am EDT (14:06 UTC)
14,500 ft	310° at 14 kt	+5 kt	-2 °C	115 kt	1 h 50 min	10:09 am EDT (14:09 UTC)
16,500 ft	300° at 14 kt	+8 kt	-7 °C	112 kt	1 h 53 min	10:12 am EDT (14:12 UTC)
18,000 ft FL180	290° at 15 kt	+10 kt	-10 °C	110 kt	1 h 55 min	10:14 am EDT (14:14 UTC)
24,000 ft FL240	250° at 21 kt	+21 kt	-22 °C	99 kt	2 h 08 min	10:27 am EDT (14:27 UTC)
30,000 ft FL300	240° at 42 kt	+42 kt	-34 °C	78 kt	2 h 42 min	11:01 am EDT (15:01 UTC)
34,000 ft FL340	240° at 47 kt	+47 kt	-40 °C	73 kt	2 h 53 min	11:12 am EDT (15:12 UTC)
39,000 ft FL390	240° at 47 kt	+47 kt	-49 °C	73 kt	2 h 53 min	11:12 am EDT (15:12 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
JFK	used from 0 nm out; 10 nm from the line	020/25	290/9 12°	300/12 7°	320/14 3°	290/17 -10°	240/27 -21°	240/44 -36°	240/53 -41°	240/51 -50°
ACY	used from 96 nm out; 47 nm from the line	350/12	340/12 11°	340/12 6°	340/13 2°	270/10 -10°	240/17 -23°	230/46 -33°	230/46 -40°	240/46 -49°
RIC	used from 192 nm out; 106 nm from the line	350/34	340/27 12°	340/36 8°	330/31 3°	310/32 -9°	320/34 -21°	300/37 -34°	290/37 -39°	290/42 -46°

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
ISP New York, NY	departure	IFR Sky: overcast at 700 feet	from the north-northeast (020°) at 11 knots	10+ mi	700 ft	98 ft	7:56 am EDT (11:56 UTC)
FRG Farmingdale, NY	19 nm out, 5 nm northeast of the line, tower	marginal VFR Sky: overcast at 1,000 feet	from the north-northeast (020°) at 10 knots	10+ mi	1,000 ft	81 ft	11:53 UTC
EWR Newark, NJ	48 nm out, 16 nm north of the line, tower	marginal VFR Sky: overcast at 1,100 feet	from the north (360°) at 13 knots, gusting to 19	10+ mi	1,100 ft	17 ft	11:51 UTC
PNE Philadelphia, PA	96 nm out, 2 nm west of the line, tower	marginal VFR Sky: scattered clouds at 1,100 feet, overcast at 1,600 feet	from the north-northwest (340°) at 10 knots	10+ mi	1,600 ft	119 ft	12:02 UTC
ILG Wilmington, DE	134 nm out, 8 nm southeast of the line, tower	marginal VFR Sky: overcast at 1,100 feet	from the north-northwest (330°) at 9 knots	10+ mi	1,100 ft	79 ft	11:51 UTC
MTN Baltimore, MD	173 nm out, 9 nm south of the line, tower	marginal VFR Sky: overcast at 1,100 feet	from the north (350°) at 4 knots	10+ mi	1,100 ft	22 ft	11:45 UTC
GAI Gaithersburg, MD	destination	VFR Sky: scattered clouds at 1,000 feet	calm	10+ mi	none	538 ft	7:56 am EDT (11:56 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, 10:00 am EDT (14:00 UTC)

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

The forecast for ISP, the departure

From Mon 8:00 am EDT (12:00 UTC): wind from the north at 13 knots, visibility more than 6 miles, a broken layer at 800 feet, overcast at 1,500 feet
From Mon 11:00 am EDT (15:00 UTC): wind from the north at 11 knots, visibility more than 6 miles, a broken layer at 2,500 feet
From Mon 2:00 pm EDT (18:00 UTC): wind from the north-northwest at 8 knots, visibility more than 6 miles, a few clouds at 2,500 feet, scattered clouds at 5,000 feet
From Mon 10:00 pm EDT (02:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 5,000 feet, a few clouds at 15,000 feet

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

5/2811 NEW YORK, NY, Monday, October 20, 2025 through Tuesday, October 20, 2026 Local 15 nm from the route, 38 nm along the route · security · until 20 October · ZNY
6/8800 Baltimore, MD, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 6 nm from the route, 182 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 ISP 6:17 pm EDT (22:17 UTC), at GAI 6:34 pm EDT (22:34 UTC) (civil twilight ends 7:01 pm EDT (23:01 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: Long Island Mac Arthur Airport, Montgomery County Airpark.