Summary
for September, 2004
===========================
HEADLINE:
DRY/MILD OVERALL: FINE/VERY WARM FIRST-THIRD, THEN UNSETTLED
(last
updated: 29/1600 NOVEMBER)
Location:
Tawfield/Wooden Hill area of SW
Bracknell, Berkshire, UK
Altitude
80 m (other location details see elsewhere on web site.)
(temperatures
[standard screen] degC; rainfall/melted snowfall mm; snow depths cm; ) Readings
taken at 0900 and 1800 UTC. Where the NIGHT maximum
or DAY
minimum are significantly different from figures hereunder, this will be noted
in the accompanying text summary. There are now two mean daily temperatures
shown: the first is the mean of the average day maximum and average night
minimum (A), and the second is the average of the 24hr maximum and 24hr minimum
(B .. as kept formerly) .. the anomalies are shown for this latter figure from
1971-2000 estimated Long Term Averages. Rainfall is credited to the 24hr day
beginning 0900 UTC.
=================================
TEMPERATURES
ETC.
Highest
day maximum (date):... 27.0(05)
Highest
24hr maximum (date):.. 27.0(05)
Lowest
night minimum (date):... 05.1(25)
Lowest
24hr minimum (date):... 05.1(25)
Lowest
overnight grass minimum (date):... 03.6(25)
[
number of days grass minimum < 0degC: ... 00 ]
[
Lowest day maximum (date):... 14.5(25)]
[
Highest night minimum (date):... 16.7(07)]
A. Mean
Day (09-18Z) maximum: ... 19.8
A. Mean
Night (18-09Z) minimum: ... 11.7
A. Mean
of Day Max & Night min: ... 15.7
B. Mean
24hr maximum:... 19.8
B. Mean
24hr minimum:... 11.6
B. Mean
of 24hr max & min:... 15.7 [+1.5 anomaly on eLTA of 14.2degC/AMENDED]
(data
below relate to 24 hr day beginning 09Z on date given)
Nr of
days minimum at 09UTC <0.0degC:00
Nr of
days maximum at 09UTC >=21degC:09
Nr of
days maximum at 09UTC >=25degC:02
Nr of
days maximum at 09UTC >=30degC:00
(Notes
relating to temperature & allied observations:
none)
=================================
PRECIPITATION
(PPN/mm)
Total
rainfall/melted snow etc:... 27.3 [41%
of eLTA of 67mm]
Highest
24hr total:............... 08.1(12)
No.
days PPN total >= 0.2:11
No.
days PPN total >= 1.0:08
No.
days PPN total >=10.0:00
No.
days PPN total >=25.0:00
(Notes
relating to precipitation & allied observations:
10th:
r(slight)/r 0630-0830Z, intermittent/slight 09Z ceasing soon after;
11th:
pr(slight) 1725-1745Z; r(slight) late evening;
12th:
pr(very slight) ~13Z; r(slight) 1925-1950Z;
13th:
r(R) from ~03Z to 0645Z, ir(slight) then to ~0745Z; pr(slight) mid-afternoon;
13th/14th:
r(R) overnight - ceased well before 05Z;
14th:
pr ~ 0855Z; pr(slight) during day, no sig. rainfall;
17th:
r(slight), short period r, 0710-0850Z; ir(slight/very) during day;
17th/18th:
r(slight), ocnl r evening & overnight . . . csd (as slight drizzle) by
18/0630Z;
18th:
ir(slight) 12Z-1515Z, then r(slight), ocnl r to 1615Z;
19th:
id(very light) morning after 09Z; id(slight) evening;
20th:
idr(slight) ~07Z; further dr(slight) during morning, then r 1115-1125Z, dry
thereafter;
22nd:
ir(slight) 0945-1000Z, further v.light 'spots' PM;
23rd:
idr(slight) ~06Z; pr(slight) 09-13Z;
25th:
r(slight)/r 1115-1430Z;
25th/26th:
heavy dewfall plus 'wet' fog = 0.1mm;
27th:
pr(slight) 0930-10Z; id(slight) early PM;
28th:
idr(slight) ~0830Z; ir(slight) 09-10Z;
29th:
idr(slight), ocnl r(slight) 06-07Z; r(slight) 0845Z, and off/on through day
with r(slight) at 18Z;
30th:
r(slight), ocnl r since at least 05Z, ceased by 10Z:
=================================
OTHER
TOTALS
Number
of days thunder heard: (dates).. 00
Number
of days hail < 0.5cm diameter:.. 00
Number
of days hail >=0.5cm diameter:.. 00
Number
of days snow/rain & snow:....... 00
Number
of days snow lying at 09UTC:.... 00
Deepest
snow cover (date,s):........... -
Number
of days fog (visibility < 1km @ 09UTC).. 00
=================================
Additional
comments on the weather in September, 2004
1.
Third dry September in a row.
2.
Temperature anomaly heavily biased towards warm nights: +2.4C 24hr Min as
against +1.3C 24hr Max.
...
these data can also be viewed at:-
http://homepage.ntlworld.com/booty.weather/metinfo/wxdata/climintro.htm
Tn
Tx Tg RR
Tn Tx RR
RR24hr Remark code (below)
(09Z) (09Z) (09Z)(18-09Z) (18Z) (18Z)
(09-18Z) (from 09Z today)
01 08.6
18.0 07.5 -
14.2 21.5 -
- -
02 10.7
19.3 09.6 -
15.7 24.0 -
-
03 12.2
21.7 10.2 -
18.8 24.9 -
-
04 12.4
22.2 10.8 -
17.9 25.7 -
-
05 13.1
24.4 11.2 -
20.2 27.0 -
-
06 13.6
25.5 11.6 -
18.8 24.9 -
-
07 16.7
22.1 16.5 -
16.9 23.6 -
-
08 14.0
21.3 13.1 -
16.9 23.0 -
-
09 13.9
19.9 11.4 -
18.1 24.7 -
04.0
10 13.4
21.8 11.3 04.0
16.0 20.1 tr
tr
11 15.0
18.6 14.0 -
16.8 20.6 00.1
00.4
12 09.8
16.7 08.9 00.3
14.4 18.3 tr
08.1
13 13.3
15.6 12.7 08.1
14.3 18.1 00.5
03.8
14 10.6
15.1 09.5 03.3
13.8 18.2 tr
tr
15 08.0
15.4 06.6 -
12.8 17.5 -
-
16 05.2
14.7 03.7 -
12.0 17.8 -
00.1 A
17 12.9
15.9 12.0 00.1
15.4 17.9 tr
01.0 B
18 15.2
17.2 14.7 01.0
15.0 18.3 01.7
01.7 C
19 08.9
14.9 07.7 tr(W)
12.9 16.7 tr tr
W=dew deposit: D
20 13.2
15.3 12.3 tr
14.7 17.9 01.6
01.6
21 09.7
14.7 08.4 -
13.1 16.3 -
-
22 10.8
14.9 09.7 -
14.9 18.4 tr
tr E F
23 15.9
18.9 14.9 tr
13.9 20.5 tr
tr G
24 07.2
13.8 04.7 -
10.6 15.1 -
-
25 05.1
12.4 03.6 -
10.2 14.5 02.3
02.4
26 10.0
13.8 08.0 00.1
13.2 19.3 -
- H
27 12.7
16.3 11.4 -
16.3 19.0 tr
tr
28 13.5 17.8 13.1 tr
14.1 18.0 tr
00.2
29 12.5
15.9 12.0 00.2
12.9 15.0 01.8
03.7 I
30 13.6
15.1 13.0 01.9
15.1 18.0 00.3
00.3 J
Remarks:
A. day
min. 16th (12.0) also the 24hr min for period ending 17/09Z
B.
night max. 17th (15.9) occurred 17/0900Z
C.
night max. 18th (17.2) occurred 18/0900Z
D. day
min. 19th (12.9) also the 24hr min for period ending 20/09Z
E.
night max. 22nd (14.9) occurred 22/0900Z
F. day
min. 22nd (14.9) also the 24hr min for period ending 23/09Z
G.
night max. 23rd (18.9), also 24hr max for 22nd, occurred 23/09Z
H.
overnight rainfall (0.1mm) combination of heavy dewfall/wet fog
I. day
min. 29th (12.9), also the 24hr min for period ending 30/09Z
J.
night max. 30th (15.1), also 24hr max for 29th, occurred 30/09Z
Number
of occasions (24hr periods) THIS YEAR (2004)
maximum
temperature >= 21degC (70degF) = 80
minimum
temperature >= 16degC (61degF) = 13
Note
relating to temperature anomaly for 2004 (up to end of September)
In the
Beaufort Park (Easthampstead Park) record (1971 - 2002), the warmest years
were:-
1989
+1.1
1990
+1.1
1999
+1.2
2003
+1.1