Summary
for May 2004
====================
HEADLINE:UNSETTLED/COOL
START. DRY/WARMER BY MID-MONTH: SHOWERY END
(last
updated: 29/1600 November)
Location:
Tawfield/Wooden Hill area of SW
Bracknell, Berkshire, UK
Altitude
80 m (other location details see
signature file appended)
(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):... 24.8(19)
Highest
24hr maximum (date):.. 24.8(19)
Lowest
night minimum (date):... 03.4(23)
Lowest
24hr minimum (date):... 03.4(23)
Lowest
overnight grass minimum (date):... 02.0(23)
[
number of days grass minimum < 0degC: ... 00 ]
[
Lowest day maximum (date):... 11.1(04)]
[
Highest night minimum (date):... 13.8(29)]
A. Mean
Day (09-18Z) maximum: ... 18.3
A. Mean
Night (18-09Z) minimum: ... 08.6
A. Mean
of Day Max & Night min: ... 13.4
B. Mean
24hr maximum:... 18.3
B. Mean
24hr minimum:... 08.5
B. Mean
of 24hr max & min:... 13.4 (+1.0 on 1971-2000 eLTA of 12.4/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:06
Nr of
days maximum at 09UTC >=25degC:00
Nr of
days maximum at 09UTC >=30degC:00
(Notes
relating to temperature & allied observations:
none)
=================================
PRECIPITATION
(PPN/mm)
Total
rainfall/melted snow etc:... 052.0 (90%
of 1971-2000 eLTA)
Highest
24hr total:............... 14.3(03)
No.
days PPN total >= 0.2:10
No.
days PPN total >= 1.0:10
No.
days PPN total >=10.0:02
No.
days PPN total >=25.0:00
(Notes
relating to precipitation & allied observations:
1st:
r(slight) 06-08Z/to April's total; v.light r 09Z-12Z;
3rd:
r(slight) 07Z, becmg r 0745-0830Z, then slight: becmg r(R) from 1025Z until
cold-frontal passage ~13Z;
4th:
r(slight) began ~0450Z, becoming r(R) from ~06Z to ~10Z, then slight again, csd
by 11Z: ocnl pr from midday - 18Z, with tl(slight)r(R) 1305-1335Z: small hail
& squall during this latter event; evening pr;
5th:
light pr through day;
6th:
v.light pr 08-09Z & ~0930Z;
7th/8th:
(overnight) r(slight)/r off & on from late evening to ~09Z;
8th:
further light dr through day until ~ 15Z;
9th:
r(slight)/r early hours, dr 08-0845Z;
10th: r
0130-0200Z, otherwise dr(slight) overnight;
20th:
very light pr ~1740Z; pr(R)q 1805-1815Z; pr ~ 21Z;
21st:
ocnl pr (light) during day;
26th:
r(slight), ocnl r from 1715Z to 1820Z;
26th/27th:
r(slight)/r overnight;
29th:
ir(slight) early hours, and again between 0615 & 0745Z; further light rain
mid-afternoon: very light rain early evening;
30th:
ocnl light rain showers during day [ but heavier events in VCNTY];
31st:
r(slight) began ~19Z, then r(R) overnight, csd by 01/0730Z Jun.)
=================================
OTHER
TOTALS
Number
of days thunder heard: (dates).. 01 (04)
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 May, 2004
2nd:
wet fog early hours to 06Z with measured 'tr' of PPN;
4th:
slight thunderstorm 1305-1335Z, with moderate, temporarily heavy rain - short
period small hail around 1315Z, accompanied by a squall; thunder/lightning
infrequent - circa 1 discharge per 3 or 4 minutes (in contrast to other local
reports of more frequent discharges)
21st-24th:
very dry air, even first thing in morning with RH << 50% much of time;
PPN that fell 20th/evening hardly worth the effort!
29th:
very small deposit of dust after rainfall - light grey to off-white: rain
occurred mid-afternoon;
...
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 08.8
11.0 08.7 00.6
09.8 13.0 tr
tr -
02 06.4
13.2 05.0 tr(f/w) 13.0 19.4 - 01.4 A
03 08.7
11.8 07.8 01.4
08.6 14.0 07.2
14.3
04 06.4
12.0 05.5 07.1
06.5 11.1 08.8
09.3
05 04.4
09.7 03.2 00.5
08.7 12.9 01.1
01.1
06 05.7
11.4 04.3 tr
10.8 15.8 tr
tr
07 05.8
14.0 04.8 -
12.6 16.9 -
03.5
08 09.0
15.0 08.6 03.5
09.0 11.3 00.1
01.0
09 10.0
11.4 09.8 00.9
11.0 15.6 -
02.3 BC
10 12.0
15.0 11.2 02.3
13.7 20.0 -
-
11 09.6
17.9 07.3 -
14.3 16.7 -
-
12 08.7
14.3 08.6 -
09.8 13.3 -
-
13 06.2
13.6 04.7 -
13.6 18.3 -
- D
14 08.8
16.9 07.5 -
16.2 20.1 -
-
15 09.0
18.9 07.5 -
15.9 21.9 -
-
16 09.6
19.3 08.0 -
18.2 23.2 -
-
17 08.6
21.0 07.0 -
20.4 24.5 -
-
18 10.4
22.0 08.3 -
18.3 23.7 -
-
19 10.4
21.2 09.2 -
18.0 24.8 -
-
20 13.3
21.6 10.7 -
16.4 21.7 tr
04.0
21 08.3
16.3 07.4 04.0
11.0 15.5 tr
tr
22 04.1
13.4 02.4 -
11.5 16.1 -
- E
23 03.4
15.0 02.0 -
14.8 19.0 -
-
24 05.8
17.5 04.1 -
16.3 20.5 -
-
25 11.2
18.9 09.1 -
16.1 19.7 -
-
26 11.5
18.1 11.2 -
14.2 18.2 01.3
01.8
27 09.4
14.1 09.1 00.5
11.7 18.1 -
-
28 07.1
16.6 06.1 -
15.7 20.6 -
tr
29 13.8
18.2 13.2 tr
15.7 20.4 tr
tr
30 10.4
16.3 09.5 tr
14.9 19.4 tr tr
F
31 08.3
18.5 06.1 -
16.6 20.9 -
13.3 G
Remarks:
A.
night max (13.2)[also 24hr max 1st] occurred 02/09Z.
B.
night max (11.4)[also 24hr max 8th] occurred around dawn.
C. day
min (11.0) [also 24hr min 9th] occurred 09/09Z.
D.
night max (13.6) [also 24hr max 12th] occurred 13/09Z.
E. work
on screen from 0915Z to 1230Z; minimum correct, as it is the value at 0900Z;
maximum possibly slightly contaminated due to follow-up work after replacing
thermometer in screen - but am reasonably confident that the value given (16.1)
is not far short of the truth.
F.
night max (16.3) occurred 30/09Z.
G.
night max (18.5) occurred 31/09Z.
Number
of occasions (24hr periods) THIS YEAR (2004)
maximum
temperature >= 21degC (70degF) = 06
minimum
temperature >= 16degC (61degF) = 00
Summary
of rainfall for:
Spring
2004: 183mm (113%)
Winter
& Spring 2003/04: 364mm (106%)
Temperature
anomaly for spring 2004: +0.7degC