For safety reasons, Rap Jumping does not operate in Strong breeze/ High Winds (Beaufort number 7)

In the event of storm conditions (Thunder, Lightning, Hail, High Winds) the session will be cancelled and we will contact you.

Our team assesses the weather an hour before each session, and if we have to cancel or postpone, you will be re-issued with a Rap Jumping Voucher, that is valid for 12 months. 

The Rap Jumping Team will contact you if these options apply.

Reference Only:

Beaufort number


Wind speed

Wave height

Sea conditions

Land conditions



< 1 km/h

0 m

Sea like a mirror

Calm. Smoke rises vertically.

< 1 mph

< 1 knot

0 ft

< 0.3 m/s


Light air

1–5 km/h

0–0.2 m

Ripples with the appearance of scales are formed, but without foam crests

Smoke drift indicates wind direction. Leaves and wind vanes are stationary.

1–3 mph

1–3 knots

0–1 ft

0.3–1.5 m/s


Light breeze

6–11 km/h

0.2–0.5 m

Small wavelets, still short but more pronounced; crests have a glassy appearance and do not break

Wind felt on exposed skin. Leaves rustle. Wind vanes begin to move.

4–7 mph

4–6 knots

1–2 ft

1.6–3.3 m/s


Gentle breeze

12–19 km/h

0.5–1 m

Large wavelets. Crests begin to break; scatteredwhitecaps

Leaves and small twigs constantly moving, light flags extended.

8–12 mph

7–10 knots

2–3.5 ft

3.4–5.5 m/s


Moderate breeze

20–28 km/h

1–2 m

Small waves with breaking crests. Fairly frequent whitecaps.

Dust and loose paper raised. Small branches begin to move.

13–18 mph

11–16 knots

3.5–6 ft

5.5–7.9 m/s


Fresh breeze

29–38 km/h

2–3 m

Moderate waves of some length. Many whitecaps. Small amounts of spray.

Branches of a moderate size move. Small trees in leaf begin to sway.

19–24 mph

17–21 knots

6–9 ft

8–10.7 m/s


Strong breeze

38–49 km/h

3–4 m

Long waves begin to form. White foam crests are very frequent. Some airborne spray is present.

Large branches in motion. Whistling heard in overhead wires. Umbrella use becomes difficult. Empty plastic bins tip over.

25–31 mph

22–27 knots

9–13 ft

10.8–13.8 m/s


High wind,
moderate gale,
near gale

50–61 km/h

4–5.5 m

Sea heaps up. Some foam from breaking waves is blown into streaks along wind direction. Moderate amounts of airborne spray.

Whole trees in motion. Effort needed to walk against the wind.

32–38 mph

28–33 knots

13–19 ft

13.9–17.1 m/s


fresh gale

62–74 km/h

5.5–7.5 m

Moderately high waves with breaking crests forming spindrift. Well-marked streaks of foam are blown along wind direction. Considerable airborne spray.

Some twigs broken from trees. Cars veer on road. Progress on foot is seriously impeded.

39–46 mph

34–40 knots

18–25 ft

17.2–20.7 m/s


Strong/severe gale

75–88 km/h

7–10 m

High waves whose crests sometimes roll over. Dense foam is blown along wind direction. Large amounts of airborne spray may begin to reduce visibility.

Some branches break off trees, and some small trees blow over. Construction/temporary signs and barricades blow over.

47-54 mph

41–47 knots

23–32 ft

20.8–24.4 m/s


whole gale

89–102 km/h

9–12.5 m

Very high waves with overhanging crests. Large patches of foam from wave crests give the sea a white appearance. Considerable tumbling of waves with heavy impact. Large amounts of airborne spray reduce visibility.

Trees are broken off or uprooted, structural damage likely.

55–63 mph

48–55 knots

29–41 ft

24.5–28.4 m/s


Violent storm

103–117 km/h

11.5–16 m

Exceptionally high waves. Very large patches of foam, driven before the wind, cover much of the sea surface. Very large amounts of airborne spray severely reduce visibility.

Widespread vegetation and structural damage likely.

64–72 mph

56–63 knots

37–52 ft

28.5–32.6 m/s


Hurricane force [7]

≥ 118 km/h

≥ 14 m

Huge waves. Sea is completely white with foam and spray. Air is filled with driving spray, greatly reducing visibility.

Severe widespread damage to vegetation and structures. Debris and unsecured objects are hurled about.