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| September 2000 Monthly Assessment
issued 2/10/2000 |
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Monthly summaries available for: England
and Wales | Scotland | Northern
Ireland
Homogenous time series based upon selected station data:
CET | England and Wales
rainfall
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| Very unsettled with frequent
outbreaks of rain, heavy and thundery at times. Short hot
sunny spell second week. Local flooding in places. |
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Diary of highlights
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1st - 9th Mostly unsettled conditions
prevailed as a series of lows passed close by. Some places
had thundery rain at first, while the 3rd and 4th were mainly
dry and sunny under a transient ridge of high pressure,
but rain affected north-west areas later. Further rain broke
out in most parts, with thunder reported in south-east England
on the 5th. Over north Wales the rain was heavy at times,
however England stayed mainly dry on the 7th. It became
quite windy in places on the 6th and 7th with a deep depression
south of Iceland. Temperatures were generally near normal
with sunny periods between the wet spells.
10th - 13th A mainly dry quiet period with some sunny
and very warm or hot weather over much of the region. Hawarden
near Chester touched 29 °C on the 11th. Northern England
was cloudier and cooler with outbreaks of rain, the lower
temperatures moving south by the 13th.
14th - 19th Apart from a mainly dry day on the 16th,
a very wet period ensued with frequent outbreaks of rain,
heavy and thundery in many places. Yorkshire, Cornwall and
the Channel coast counties were particularly affected. Walderton
in West Sussex collected 84 mm during the 15th, while many
locations in south-east England experienced local flooding
from thunderstorms.
20th - 23rd Rather cool with sunny periods and some
thundery rain, heavy at times in the north, was followed
by drier weather on the 22nd. The 23rd became very warm
and sunny.
24th - 27th Another very wet spell with frequent outbreaks
of rain, heavy and thundery at times, as frontal systems
crossed the region from the south-west. The 27th became
windy especially over western parts as a vigorous Atlantic
low became centred off south-west Ireland.
28th - 30th More sunny periods and showers [some thundery]
as the low over southern Ireland drifted slowly south-east
to south-west England and filled. Some showers on the 30th
were quite heavy in places, notably over north-west London
around midday moving into the Midlands later. A waterspout
was spotted near Brighton, with a funnel cloud reported
from Lincolnshire. Some parts were affected by mist and
fog patches early in the morning and later in the evening.
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| Statistical details (using best available
data/estimates): updated 2003 |
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England & Wales Mean Temperature Series ( series
began in 1961 ). The value for the month was 14.4 °C, which
is 1.3 °C above the 1961-1990 average, which is in the well
above average category. 3rd warmest in series, warmest
was 1999 with 15.2 °C.
England & Wales Rainfall Series ( series began
in 1961 ). The total for the month was 121.5 mm, which is
155 % of the 1961-1990 average, which is in the well above
average category. Wettest since 1981, when 140.9 mm was
recorded.
England & Wales Sunshine Series ( series began
in 1961 ). The total for the month was 115.2 hours, which
is 87 % of the 1961-1990 average, which is in the below
average category.
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| Scotland |
| Anticyclonic and northerly spells of weather
occurred briefly at the start of September, but otherwise
were notable for their absence. Winds blew mainly from west
through south to east, and changeable weather, with bands
of rain separating bright and showery conditions, were common.
However, there were also some cyclonic spells bringing some
longer periods of rain. |
| Diary of Highlights |
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1st Cyclonic, with low in Irish Sea
and showery conditions predominating.
2nd - 4th Cool northerly outbreak followed by anticyclonic
conditions. This gave fine weather with cold nights and
on the 4th the temperature fell to -1.8 °C at Corgarff and
-0.8 °C at Kinbrace.
5th - 9th Changeable westerly weather type with a mixture
of bands of rain and sunny periods and showers. A deep depression
passing between Iceland and Scotland brought the first gales
of the autumn, with gusts reaching 55 m.p.h. at Prestwick
on the 6th and 60 m.p.h. at Lerwick and Stornoway on the
7th.
10th - 12th A low pressure centre forming on a slow
moving front brought substantial rainfall to southern and
central parts of the country. There was 32 mm of rain at
Eskdalemuir on the 10th and 34 mm at Inverbervie on the
11th.
13th - 17th Return to changeable westerly regime, but
with light winds.
18th - 22nd The main low pressure area was located to
the west of Ireland, turning the winds into the south. The
changeable weather continued, and on the 19th the temperature
fell to -1.3 °C at Corgarff and -0.6 °C at Aboyne. Later
that day there was 31 mm of rain at East Kilbride.
23rd - 24th A warm and humid south-easterly airstream
spread north, with temperatures reaching 21.9 °C at Prestwick
on the 23rd and 22.5 °C at Loch Carron on the 24th.
25th - 27th Frequent bands of rain as fronts pushed
up from the south-west.
28th - 30th Showery regime with light southerly winds.
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Statistical details (using
best available data/estimates): updated 2003
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Scotland Mean Temperature Series (
series began in 1961 ). The value for the month was 11.7
°C, which is 1.2 °C above the 1961-1990 average, which is
in the above average category.
Scotland Rainfall Series ( series began in 1961
). The total for the month was 146.6 mm, which is 102 %
of the 1961-1990 average, which is in the close to average
category.
Scotland Sunshine Series ( series began in 1961
). The total for the month was 100.6 hours, which is 102
% of the 1961-1990 average, which is in the close to average
category.
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| Northern
Ireland |
| Wet with sunshine near normal, but quite
warm. |
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Diary of Highlights
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1st - 9th Predominantly dry,
warm and sunny. Scattered showers on some days, otherwise
mostly overnight rain.
10th – 17th Often dull and wet. Widespread
heavy thunderstorms recorded early on 11th.
18th – 19th Largely dry and quite sunny.
Isolated showers.
20th – 30th Unsettled with frequent spells
of persistent rain. Friday 22nd was a dry and for many areas
quite sunny day. Further widespread heavy thunderstorms
recorded early on Sunday 24th. Widespread heavy rain across
east Antrim and Down through early hours of Friday 29th.
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Statistical details (using
best available data/estimates): updated 2003
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Northern Ireland Mean Temperature Series ( series
began in 1961 ). The value for the month was 13.0 °C, which
is 1.1 °C above the 1961-1990 average, which is in the above
average category.
Northern Ireland Rainfall Series ( series began
in 1961 ). The total for the month was 131.0 mm, which is
131 % of the 1961-1990 average, which is in the above average
category.
Northern Ireland Sunshine Series ( series began
in 1961 ). The total for the month was 105.9 hours, which
is 98 % of the 1961-1990 average, which is in the close
to average category.
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Homogeneous series based upon selected station data: updated
2003 |
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Central England Temperature (series begins in 1659).
The mean value for the month was 14.7 °C which is 1.1 °C
above the 1961-90 normal of 13.6 °C and is in the above
average category. Others:- 1999/15.6, 1998/14.9, 1997/14.2,
1996/13.6 °C.
England and Wales Rainfall (series begins in 1766).
The total for the month was 132.6 mm, which is 170 % of
the 1961-90 average and is in the exceptionally above average
category. Others:- 1999/124.9, 1998/104.4, 1997/30.8, 1996/34.0,
1995/123.3, 1981/139.9, 1976/150.8 mm.
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| Note: Diary values are provisional based
on data available at the time. |
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