Washington Dulles International to Lehigh Valley International IAD → ABE
138 nautical miles (159 statute miles) northeast on a straight line, true course 042°, about 052° magnetic at the departure end (variation 10W). At 120 knots that is 41 min at the quickest height in today's winds (34,000 ft, a 83-knot tailwind), arriving about 3:14 am EDT (07:14 UTC), after sunset at the destination. Right now IAD is IFR, wind from the north (350°) at 15 knots, gusting to 27; ABE is marginal VFR, wind from the northeast (040°) 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: 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 E22E: thunderstorms (a convective SIGMET) up to 40,000 ft, moving from the southwest at 20 knots, until 3:55 am EDT (07:55 UTC). Over the first 89 nm of the route.
as issued
WSUS31 KKCI 120555 MKCE WST 120555 CONVECTIVE SIGMET 22E VALID UNTIL 0755Z NY NJ PA DE MD VA DC WV AND MA RI DE NJ NY CSTL WTRS FROM 40E HTO-80SSW ACK-100ESE SIE-30SW CSN-40SSE JST-40E HTO AREA EMBD TS MOV FROM 24020KT. TOPS TO FL400.
- 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 21,000 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 IAD.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
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 3 forecast points nearest it (RIC, ACY, AVP). 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 | 250° at 13 kt | −12 kt | 132 kt | 1 h 03 min | 3:36 am EDT (07:36 UTC) | |
| 5,500 ft | 260° at 12 kt | −9 kt | 129 kt | 1 h 04 min | 3:37 am EDT (07:37 UTC) | |
| 7,500 ft | 250° at 16 kt | −14 kt | 11 °C | 134 kt | 1 h 02 min | 3:35 am EDT (07:35 UTC) |
| 9,500 ft | 240° at 22 kt | −21 kt | 7 °C | 141 kt | 59 min | 3:32 am EDT (07:32 UTC) |
| 11,500 ft | 230° at 23 kt | −23 kt | 5 °C | 143 kt | 58 min | 3:31 am EDT (07:31 UTC) |
| 13,500 ft | 230° at 26 kt | −26 kt | 1 °C | 146 kt | 57 min | 3:30 am EDT (07:30 UTC) |
| 15,500 ft | 230° at 29 kt | −29 kt | -3 °C | 149 kt | 56 min | 3:29 am EDT (07:29 UTC) |
| 17,500 ft | 230° at 32 kt | −32 kt | -8 °C | 152 kt | 54 min | 3:27 am EDT (07:27 UTC) |
| 18,000 ft FL180 | 230° at 33 kt | −32 kt | -8 °C | 152 kt | 54 min | 3:27 am EDT (07:27 UTC) |
| 24,000 ft FL240 | 230° at 45 kt | −45 kt | -20 °C | 165 kt | 50 min | 3:23 am EDT (07:23 UTC) |
| 30,000 ft FL300 | 220° at 74 kt | −74 kt | -32 °C | 194 kt | 43 min | 3:16 am EDT (07:16 UTC) |
| 34,000 ft FL340 | 230° at 84 kt | −83 kt | -40 °C | 203 kt | 41 min | 3:14 am EDT (07:14 UTC) |
| 39,000 ft FL390 | 230° at 67 kt | −66 kt | -50 °C | 186 kt | 45 min | 3:18 am EDT (07:18 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| RIC | used from 0 nm out; 105 nm from the line | 270/23 | 280/19 11° | 270/18 8° | 240/22 4° | 230/39 -7° | 220/55 -18° | 220/75 -30° | 230/83 -39° | 230/64 -50° |
| ACY | used from 49 nm out; 87 nm from the line | 220/19 | 220/18 14° | 210/36 9° | 210/35 5° | 220/36 -8° | 240/49 -21° | 220/90 -31° | 230/103 -40° | 230/81 -50° |
| AVP | used from 99 nm out; 56 nm from the line | 150/5 | 350/13 12° | 270/20 8° | 260/17 4° | 260/25 -11° | 240/31 -22° | 240/54 -35° | 230/61 -41° | 240/55 -49° |
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 |
|---|---|---|---|---|---|---|---|
| IAD Washington, DC | departure | IFR Sky: a broken layer at 800 feet, overcast at 1,800 feet Weather: light rain, mist | from the north (350°) at 15 knots, gusting to 27 | 4 mi | 800 ft | 312 ft | 1:52 am EDT (05:52 UTC) |
| FDK Frederick, MD | 20 nm out, 16 nm northwest of the line, tower | IFR Sky: overcast at 900 feet | from the north (350°) at 8 knots | 10+ mi | 900 ft | 308 ft | 06:15 UTC |
| LNS Lancaster, PA | 89 nm out, 7 nm northwest of the line, tower | IFR Sky: overcast at 600 feet | from the north-northeast (030°) at 8 knots | 10+ mi | 600 ft | 402 ft | 05:53 UTC |
| RDG Reading, PA | 109 nm out, 7 nm northwest of the line, tower | marginal VFR Sky: overcast at 1,000 feet | from the northeast (040°) at 6 knots | 10+ mi | 1,000 ft | 343 ft | 06:22 UTC |
| ABE Allentown, PA | destination | marginal VFR Sky: overcast at 1,900 feet | from the northeast (040°) at 10 knots | 10+ mi | 1,900 ft | 393 ft | 1:51 am EDT (05:51 UTC) |
The highest airport on this list sits at 402 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At ABE when you get there the forecast at the estimated arrival, 3:14 am EDT (07:14 UTC)
Wind from the northeast at 8 knots, visibility 6 miles, mist, showers nearby, overcast at 1,000 feet marginal VFR
At times between Mon 2:00 am EDT (06:00 UTC) and 5:00 am EDT (09:00 UTC): visibility 5 miles, light rain showers, mist, a broken layer at 900 feet IFR
The whole forecast for ABE
- From Mon 2:00 am EDT (06:00 UTC): wind from the northeast at 8 knots, visibility 6 miles, mist, showers nearby, overcast at 1,000 feet
- At times between Mon 2:00 am EDT (06:00 UTC) and 5:00 am EDT (09:00 UTC): visibility 5 miles, light rain showers, mist, a broken layer at 900 feet
- From Mon 7:00 am EDT (11:00 UTC): wind from the north at 6 knots, visibility 6 miles, mist, a broken layer at 2,000 feet
- From Mon 11:00 am EDT (15:00 UTC): wind from the north-northwest at 10 knots, visibility more than 6 miles, scattered clouds at 3,500 feet
- From Mon 6:00 pm EDT (22:00 UTC): wind from the west-northwest at 8 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
- From Mon 9:00 pm EDT (01:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 25,000 feet
The forecast for IAD, the departure
- From Mon 2:00 am EDT (06:00 UTC): wind from the north-northwest at 12 knots, visibility 5 miles, light rain, mist, overcast at 600 feet
- From Mon 8:00 am EDT (12:00 UTC): wind from the north-northwest at 10 knots, gusting to 18, visibility more than 6 miles, overcast at 1,000 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, scattered clouds at 1,500 feet, overcast at 2,500 feet
- From Mon 2:00 pm EDT (18:00 UTC): wind from the north-northwest at 11 knots, gusting to 18, visibility more than 6 miles, scattered clouds at 2,500 feet, overcast at 3,500 feet
- From Mon 5:00 pm EDT (21:00 UTC): wind from the northwest at 7 knots, visibility more than 6 miles, a broken layer at 3,500 feet
- From Mon 8:00 pm EDT (00:00 UTC): wind from the west-northwest at 3 knots, visibility more than 6 miles, scattered clouds at 4,000 feet
Temporary flight restrictions on the line or within 25 nm of it
- 4/9383 WASHINGTON, DC., USA 3 nm from the route, 10 nm along the route · security · ZDC
- 6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local on the route, 10 nm along the route · a VIP movement · today · ZDC
- 6/8800 Baltimore, MD, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 15 nm from the route, 40 nm along the route · drones kept away from a public gathering · starts Saturday 17 October · ZDC
Daylight
Sunset at IAD 6:36 pm EDT (22:36 UTC), at ABE 6:26 pm EDT (22:26 UTC) (civil twilight ends 6:53 pm EDT (22:53 UTC)). At 120 knots the arrival at ABE is before sunrise there (7:09 am EDT (11:09 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
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: Washington Dulles International, Lehigh Valley International.