Summary
for July 2004
=====================
HEADLINE:CYCLONIC/COOL
UNTIL 12TH THEN WARM & LARGELY DRY: HOT FINISH
(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):... 28.8(29)
Highest
24hr maximum (date):.. 28.8(29)
Lowest
night minimum (date):... 08.5(06)
Lowest
24hr minimum (date):... 08.5(06)
Lowest
overnight grass minimum (date):... 07.1(05)
[
number of days grass minimum < 0degC: ... 00 ]
[
Lowest day maximum (date):... 17.7(11)]
[
Highest night minimum (date):... 16.7(30)]
A. Mean
Day (09-18Z) maximum: ... 22.4
A. Mean
Night (18-09Z) minimum: ... 12.3
A. Mean
of Day Max & Night min: ... 17.3
B. Mean
24hr maximum:... 22.4
B. Mean
24hr minimum:... 12.3
B. Mean
of 24hr max & min:... 17.3 [-0.3 anomaly on eLTA of 17.6degC/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:22
Nr of
days maximum at 09UTC >=25degC:06
Nr of
days maximum at 09UTC >=30degC:00
Notes
relating to temperature & allied observations:
Although
overall the mean temperature was just below average, the night minima ended up
with an anomaly 0.0degC, and from 13th (incl.), the anomaly on day maxima was
+1.1degC. The problem was the first 12 days of the month, when the average day
maximum was 19.3degC (-3.9C), with one day 5.5C below average. It would have
needed *markedly* above average temperatures for the rest of the month to
offset this.
=================================
PRECIPITATION
(PPN/mm)
Total
rainfall/melted snow etc:... 39.0 [87%
of eLTA of 45mm]
Highest
24hr total:............... 19.4(07)
No.
days PPN total >= 0.2:10
No.
days PPN total >= 1.0:06
No.
days PPN total >=10.0:01
No.
days PPN total >=25.0:00
(Notes
relating to precipitation & allied observations:
1st:
pr(slight)/pr from late morning;
1st/2nd:
(overnight) r(R), csd by ~0430Z;
2nd:
frq pr(slight)/pr (&q) through day/early evening;
3rd:
pr(slight) from ~0850Z until ~16Z;
4th:
ir(v.light) ~0840Z; pr(slight)/pr 1812-1925Z;
6th:
pr(slight) from 1745Z to 1810Z;
7th:
r(slight)/r from 1401Z, ocnl R 1555-1615Z: rain started abruptly moderate at
1401Z: then r(slight/moderate) until ~23Z, with period R from ~2055Z to 2145Z;
8th:
pr(slight), ocnl pr through day: t(1315Z/single rumble): r 1600-1620Z;
9th: pr
(v.slight) mid-afternoon;
10th:
pr(slight) from 0905Z through day (tr only): tl(slight)r(slight) ~1135Z;
pr(R),q 2020-2035Z (2.2mm);
11th:
ir(slight) until ~08Z; few pr(very light) 1145-13Z;
12th:
r(slight)/r 0840-0855Z;
14th:
r(slight)/dr(slight), ocnl r from 0535, csd by 0840Z;
15th:
v.light d ~0745Z;
16th:
r(slight)/dr(slight) early hours to ~08Z;
18th:
r(slight), ocnl r from 0725Z, csd by 10Z; pr(slight) ~1725/1730Z;
20th:
r(slight) 1910-1950Z;
21st:
d(slight) ~ 0630Z; pr(very slight) early PM;
22nd:
ir(very slight) mid-afternoon;
25th:
ir(slight) 1320-1430Z & around 1645Z [evaporated quickly];
26th:
id/r(slight) from ~0815Z to late morning, ocnl pr(slight);
29th:
r(slight), short period r 22-23Z;
31st:
ir(slight) 0835-0840Z (from apparently thin/broken Ac)
=================================
OTHER
TOTALS
Number
of days thunder heard: (dates).. 02 (08,10)
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 July, 2004
7th:
ENE or NE wind F5/6, ocnl F7 (short-periods) from mid-morning to ~16Z;
8th:
thunder heard (no PPN) ~ 1315Z;
10th:
slight thunderstorm (with slight rain) ~1135Z;
26th:
at 18Z observation hour, 2 oktas Ci, with trace Cc: of the cirrus, some
elements were obviously ex-COTRA ('standard' condensation trails also in
evidence - but rather short): these exhibited both castellatus properties
(crenellations) - very vigorous allowing for the high altitude, and highly
sheared fall-streaks (virga) in very tortuous patterns.
...
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 10.0
17.9 09.1 tr
15.8 19.4 00.6
04.5 -
02 11.5
16.6 10.9 03.9
13.9 18.2 02.2
02.2 A
03 10.7
16.3 09.9 tr
14.9 19.0 00.1
00.1
04 10.4
17.4 09.2 tr
15.4 18.3 -
02.2
05 08.8
17.4 07.1 02.2
16.1 21.7 -
-
06 08.5
20.4 07.3 -
19.7 23.3 tr
tr
07 11.7
20.5 10.5 tr
12.4 21.1 09.9
19.4
08 11.8
16.4 10.9 09.5
14.1 17.9 06.5
06.5 B
09 10.5
14.9 10.3 tr
14.0 18.4 tr
tr
10 09.3
17.9 08.5 -
16.2 18.7 tr
02.2
11 10.5
16.2 10.1 02.2
14.7 17.7 tr
00.1
12 11.5
16.3 10.1 00.1
14.0 18.8 -
-
13 08.7
17.5 07.2 -
17.4 21.9 -
00.9
14 12.6
19.1 12.2 00.9
14.7 21.8 -
tr C
15 16.3
20.8 16.0 tr
18.7 24.1 -
00.4
16 16.6
22.7 16.2 00.4
17.6 23.3 -
-
17 15.5
20.9 15.5 -
18.8 24.6 -
00.3
18 15.0
22.4 14.2 00.3
15.8 21.5 tr
tr
19 09.8
19.6 07.8 -
19.1 23.3 -
-
20 10.8
20.8 09.0 -
20.0 24.2 -
tr
21 16.0
22.0 15.5 tr
19.9 23.1 tr
tr
22 14.3
21.2 12.3 -
19.6 25.9 tr
tr
23 13.7
23.3 11.8 -
20.2 25.7 -
-
24 11.8
23.2 10.6 -
19.4 24.2 -
-
25 12.2
20.1 11.6 -
17.1 22.9 tr
tr
26 15.0
18.1 14.8 tr
16.7 21.8 tr
tr
27 12.9
19.7 11.2 -
17.9 23.3 -
-
28 12.3
22.3 09.0 -
20.8 26.8 -
-
29 13.6
24.3 11.5 -
24.1 28.8 -
00.2 D
30 16.7
23.9 15.7 00.2
19.0 25.7 -
tr
31 13.4
24.5 12.6 tr
20.6 28.2 -
-
Remarks:
A.
night max. 2nd (16.6) occurred 02/09Z.
B.
night max. 8th (16.4) occurred 08/09Z.
C. day
min. 14th (14.7)[also 24hr min 15th] occurred 14/09Z
D.
night max. 29th (24.3) occurred 29/09Z.
Number
of occasions (24hr periods) THIS YEAR (2004)
maximum
temperature >= 21degC (70degF) = 47
minimum
temperature >= 16degC (61degF) = 05