Summary
for April, 2004
=======================
HEADLINE:SHOWERY
START; WET SPELL MID-MONTH, HEAVY RAIN END. MILD.
(last
updated: 29/1600 November)
Location:
Tawfield/Wooden Hill area of SW
Bracknell, Berkshire, UK
Altitude
80 m (other location details see 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):... 21.5(24)
Highest
24hr maximum (date):.. 21.5(24)
Lowest
night minimum (date):... 00.6(09)
Lowest
24hr minimum (date): ... 00.6(09)
Lowest
overnight grass minimum (date):... -01.7(09)
[
number of days grass minimum < 0degC: ... 04 ]
[
Lowest day maximum (date):... 08.8(29)]
[
Highest night minimum (date):... 10.3(27)]
A. Mean
Day (09-18Z) maximum: ... 14.3
A. Mean
Night (18-09Z) minimum: ... 05.5
A. Mean
of Day Max & Night min: ... 09.9
B. Mean
24hr maximum:... 14.3
B. Mean
24hr minimum:... 05.5
B. Mean
of 24hr max & min:... 09.9 (+1.1 on eLTA 71-00 of 8.8/CORRECTED FIG.)
(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:01
Nr of
days maximum at 09UTC >=25degC:00
Nr of
days maximum at 09UTC >=30degC:00
(Notes
relating to temperature & allied observations:
9th/10th:
overnight minimum (6.2) occurred during evening 9th;
10th:
24hr minimum (5.9degC) occurred at 09/0900Z;
18th:
temperature fell during afternoon in heavy, persistent rain, reaching the day
minimum (5.8) at 18Z;
29th: a
cold, damp day: day-max (8.8) occurred at 18Z, after rising slowly all day from
6.6 in the morning;
=================================
PRECIPITATION
(PPN/mm)
Total
rainfall/melted snow etc:... 083.5 (161% eLTA 71-00 of 52mm)
Highest
24hr total:............... 16.3(27)
No.
days PPN total >= 0.2:14
No.
days PPN total >= 1.0:13
No.
days PPN total >=10.0:02
No.
days PPN total >=25.0:00
(Notes
relating to precipitation & allied observations:
1st:
slight rain 05-06Z, credited to March rainfall; r(slight)/r mid/late evening;
3rd:
ir(slight) early hours; v.light dr(slight) at times 09-18Z; r(slight), ocnl r
set in mid-evening, then r(R) overnight 3rd/4th, with strong wind;
4th:
pr(slight), tempo moderate 11Z-18Z; further showers evening & overnight
4th/5th;
5th:
pr(slight) 10Z onwards, but pr/r 1610Z-1635Z; further pr(slight/mod) evening;
6th:
several pr from 1115Z, some with small hail & squalls; further pr(R)q
1833-1850Z;
7th: pr
(slight) ~16Z & early evening;
8th:
very light pr late AM to ~18Z;
10th:r(slight)/r,
ocnl dr(slight) from early hours to ~0830Z; further dr(slight, ocnl r(slight)/r
09-11Z;
12th/13th:
pr(slight) overnight, after 12/21Z, before 13/05Z;
17th/18th:
r(R) ~17/22Z to ~18/0755Z;
18th:
r(R) from ~10Z to late afternoon; further light r through evening, dying out
early hours 19th;
19th:
pr(slight) ~13/1330Z;
20th:
ir(slight) 13-1330Z; r(slight) began 1740Z then through early/mid-evening;
21st:
ird(slight) from 0545Z-14Z, r(slight)/r 14Z-17Z;
22nd:
v. light pr ~15Z & again around 1830Z;
27th/28th:
t(distant) 27/1700Z, tl(slight)r(slight) 27/1720Z, thunder overhead / medium
level at 27/18Z (with rain continuing): moderate rain (still with odd rumbles of
thunder) from 1820Z: tl(slight) csd around 27/1855Z, but r(slight)/r continued
through evening (6mm up to 27/20Z) & overnight - ocnl R, especially around
28/01Z;
28th:
further r(slight)/r up to 09Z, with ts(slight) 28/0820-0840Z (odd rumble only);
ocnl r(slight) during day;
28th/29th:
further v.light rain overnight & through early morning;
29th:
r(slight) becoming r(slight)/ocnl r from ~ 0930Z to 13Z, then ir(slight) again
until at least 18Z;
30th:
further ir(slight) through early hours, becoming persistent 0630Z; ocnl r until
15Z, then idr(slight) thereafter;
1st
May: r(slight) 06-08Z/to this months total.)
=================================
OTHER
TOTALS
Number
of days thunder heard: (dates).. 02 (27,28)
Number
of days hail < 0.5cm diameter:.. 01
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 April, 2004
27th:
distant thunder heard 1700Z, tl(slight)r(slight) from 1720-1855Z, with activity
overhead for a short time around 18Z, but CC or intracloud, no CG observed
here. (Main TS activity to east of us, where some severe storms reported from
Surrey & London).
28th:
odd rumbles of thunder 0820-0840Z;
...
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 08.9
15.2 07.3 00.2
10.7 15.8 -
02.5
02 08.5
14.4 08.0 02.5
09.7 15.6 -
00.1
03 06.5
13.2 04.9 00.1 10.4 13.9 tr
07.9
04 06.0
12.0 04.9 07.9
09.0 12.1 00.9
01.5
05 05.2
09.6 03.9 00.6
08.3 11.3 02.7
04.3
06 03.3
09.2 01.7 01.6
04.7 09.7 04.5
05.9
07 03.5
07.8 02.1 01.4
07.4 10.6 tr
00.1
08 01.3
08.3 -00.8 00.1 06.7
10.2 tr tr
09 00.6
08.3 -01.7 tr 05.9
12.3 - 01.8 A
10 06.2
11.4 03.8 01.8
09.0 11.0 00.1
00.1 B
11 01.0
09.0 -00.5 - 06.0
12.9 - -
12 03.6 12.3 01.9 -
11.0 16.1 -
00.2
13 06.3
13.7 04.0 00.2
10.7 14.0 -
-
14 03.5
13.3 01.2 -
11.3 16.1 -
-
15 06.3
12.7 05.0 -
10.9 14.8 -
-
16 06.6
13.4 03.9 -
13.2 18.4 -
-
17 07.3
16.0 06.4 -
10.1 14.5 -
07.4
18 06.4
10.2 05.9 07.4
05.8 11.1 12.7
16.0
19 02.2
07.6 01.1 03.3
07.5 12.2 00.1
00.1
20 00.9
10.4 -00.5 - 09.3
13.3 tr 02.0
21 08.7
12.0 08.2 02.0
12.0 14.6 03.4
03.4 C
22 04.4
12.4 02.7 tr
11.1 16.6 tr
tr
23 03.4
15.0 01.6 tr
11.9 18.6 -
-
24 05.5
17.2 03.9 -
14.1 21.5 -
-
25 08.5
20.3 06.3 -
15.1 20.5 -
-
26 06.5
19.0 04.5 -
14.3 20.7 -
-
27 10.3
18.9 08.6 -
11.9 17.0 tr
16.3
28 09.6
13.9 08.8 16.3
11.0 12.4 tr
tr
29 06.7
11.0 06.5 tr
06.6 08.8 05.3
06.4 D
30 07.6
08.7 07.5 01.1
08.4 11.2 06.9
07.5 E
Remarks:
A. day
minimum [also 24hr min 10th] (5.9) occurred 09/0900Z
B.
night minimum (6.2) occurred evening 9th - air mass change
C.
night maximum (12.0) occurred 21/0900Z
D. day
minimum [also 24hr min 30th](6.6) occurred 29/0900Z
E. day
minimum [also 24hr min 1st May](8.4) occurred morning 30th.