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The Islander Newspaper Ascension Island
  Issue No. 2164 Online Edition Wednesday 19 June 2013 
Home | Categories | Met Office Please tell us what you think of this article. Tell a friend Print Friendly

Ascension : Met Office - Weather Report
Submitted by The Islander (Met Office) 14.04.2011 (Article Archived on 28.04.2011)

On Thursday night a suspected waterspout was observed underneath a convective cumulus cloud to the south of the Island.

  

Statistics for the week ending Monday 17-Apr-11

 

Max (Celsius)

Min (Celsius)

Rainfall (mm)

AIRHEAD

31.8

23.9

20.7

TRAVELLERS

32.7

23.1

67.1

RESIDENCY

29.3

21.1

72.6

GEORGETOWN

 

 

 

ST. HELENA

24.0

17.5

7.0

FALKLANDS

13.5

0.8

15.5

UK (Brize Norton)

20.4

4.4

1.2

UK

After an unsettled start to the week, high pressure dominated the end of the week bringing fine and settled conditions.

Falklands

Autumn has definitely arrived in the Falklands with several areas of low pressure crossing the islands during the week. This brought cloudy, gusty conditions at times with outbreaks of rain.

Ascension

A rather unsettled week with heavy showers at times, especially on Tuesday and Wednesday.

St. Helena

Mainly fine with isolated showers throughout the week. Moderate south easterly winds eased as the week progressed.

 

 At the bottom, at the bottom of the waterspout…

On Thursday night a suspected waterspout was observed underneath a convective cumulus cloud to the south of the Island. These fair weather waterspouts occur in coastal waters in the tropics and sub-tropics and form in areas of high sea temperatures and humidity. They develop rapidly from the surface and work their way upwards, with water vapour condensing to give the visible spout. By the time the spout is visible they are near full maturity and last between 10 and 15 minutes.

 

Fair weather waterspouts are generally not dangerous, unlike their potentially destructive relative, the tornadic waterspout. This type of waterspout develops in association with severe thunderstorms and has the same characteristics as land tornados. This poses a threat to ships, planes, helicopters, and swimmers as they are often accompanied by strong winds, high seas, large hail and frequent lightning. As you can imagine if you ever witness one, you are recommended to keep a considerable distance away from it.

 

Compiled by: Misty Summers

Crown Copyright 2011

 

Met Office Ascension Island base

 

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