Summary
for March 2004
======================
HEADLINE:RATHER
COLD FIRST HALF; LESS COLD BUT SHOWERY THEREAFTER
(last
updated: 29/1600 November)
NOTE:
BREAK IN DATA FROM 26/0900 TO 28/1800; DATA BETWEEN THOSE TWO EVENTS ESTIMATED
WHERE REQUIRED.
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):... 18.1(31)
Highest
24hr maximum (date):.. 18.1(31)
Lowest
night minimum (date):... -05.1(01)
Lowest
24hr minimum (date):... -05.1(01)
Lowest
overnight grass minimum (date):... -06.1(01)
[
number of days grass minimum < 0degC: ... 08 ]
[
Lowest day maximum (date):... 05.0(10)]
[
Highest night minimum (date):...
10.5(16)]
A. Mean
Day (09-18Z) maximum: ... 10.0
A. Mean
Night (18-09Z) minimum: ... 03.5
A. Mean
of Day Max & Night min: ... 06.7
B. Mean
24hr maximum:... 10.0
B. Mean
24hr minimum:... 03.3
B. Mean
of 24hr max & min:... 06.7 (+0.0 on eLTA of 6.7/CORRECTED FIGURE)
(data
below relate to 24 hr day beginning 09Z on date given)
Nr of
days minimum at 09UTC <0.0degC:04[dates: 01-03,26]
Nr of
days maximum at 09UTC >=21degC:00
Nr of
days maximum at 09UTC >=25degC:00
Nr of
days maximum at 09UTC >=30degC:00
(Notes
relating to temperature & allied observations:
1st:
coldest night of 2004 (so far); 3rd: 24hr min (-0.7), occurred 02/09Z; 4th:
24hr min (3.2), occurred 03/09Z; 7th/8th: night minima, grass/air, early in
night > cloudy/Sc by dawn; 19th/20th: night minima, grass/air, early in
night > cloudy/damp by early 20th;)
=================================
PRECIPITATION
(PPN/mm)
Total
rainfall/melted snow etc:... 047.5 (91 % of eLTA of 52mm)
Highest
24hr total:............... 08.3(11)
No.
days PPN total >= 0.2:17
No.
days PPN total >= 1.0:11
No.
days PPN total >=10.0:00
No.
days PPN total >=25.0:00
(Notes
relating to precipitation & allied observations:
3rd:
rain began circa 2030Z, ocnl moderate thereafter;
5th:
deep Cu development early afternoon - shower in vicinity, but none here;
6th:
very light rain ~0830Z;
6th/7th:
light rain o/n [before 06Z];
7th:
pr(slight)>pr>phr 1055-1120Z, with small hail giving slushy covering for
about 30 mins: pr>phr>rs(slight sleet element only, but a temporary snow
pellet phase giving a patchy covering)>r(slight) 1137-1245Z;
10th:
v.light s/few flakes/0650-0720Z & again 1425; slight sleet & snow
grains from circa 1750Z;
11th:
sleet>snow>rain, all very light, 0805-0820Z; further rain/sleet ~1325Z;
snow, mainly slight but temporarily moderate 2035-2300Z (only fully covering
grass, very patchy otherwise;
12th:
further snow early hrs, ocnl moderate (full cover most surfaces but only
significant over grass, csd by about 0530Z; r(slight)>r from about 15Z, >
r/d(slight) by ~17Z;
12th/13th:
r(slight) ocnl r evening & overnight, csd by 13/07Z;
13th/14th:
r(slight)/r [plus gusty winds] late eve & overnight;
14th:
slight dr AM>~12Z r(slight)/r, csd by 1630Z; ir(slight) eve;
15th:
slight r 15-16Z, otherwise drizzle much of afternoon;
18th:
slight dr from ~15Z, then short, sharp squall/r(R) 1750Z;
19th:
slight, ocnl moderate r from 06Z to early afternoon;
20th:
ocnl dr(slight, tempo moderate) early hours to 0730Z; further ocnl r (mainly
light) to early PM, then pr(slight) to 17Z;
21st:
light pr 06-0815Z; squally pr(mostly light) during day, but ph(slight)rq
~1305Z;
22nd:
pr(slight), tempo pr, during day, mainly 11Z-16Z;
23rd:
r(slight), ocnl r 0655-0720Z; slight ph/H (diameter up to 6mm) 1155Z; slight
psh/H (diameter up to 7mm, with a few snow pellets & isolated flakes of
snow) 1400Z; otherwise several, mainly light, rain showers during day &
early evening;
24th:
ir(slight) overnight, csd by 08Z; ph(slight)r ~14Z; pHr 1620-1632Z, then
pr/r(slight) to ~1710Z;
25th:
showers during 09-18Z period, with ph(small/light) 0915/20Z & 1407Z; 26th: v.light pr ~0810Z; (estimated) r/d
from roughly mid-evening;
27th:
(estimated) rain/drizzle much of day;
28th:
(estimated) v.light drizzle at time until late afternoon;
31st/1st
April: ocnl light rain 01/05Z - 06Z;)
=================================
OTHER
TOTALS
Number
of days thunder heard: (dates).. 00
Number
of days hail < 0.5cm diameter:.. 05
Number
of days hail >=0.5cm diameter:.. 02
Number
of days snow/rain & snow:....... 05
Number
of days snow lying at 09UTC:.... 01
Deepest
snow cover (date,s):........... 03(12)
Number
of days fog (visibility < 1km @ 09UTC).. 01
=================================
Additional
comments on the weather in March, 2004
5th:
wet fog from at least 04Z .. measured 'trace' at 09Z, cleared above 1km by
about 0950Z; 12th: note difference between 3cm snow-depth & 8.3mm rainfall
reported indicating high water content & large 'pre-melt' of much snow
evening 11th; 12th: all sig. snow gone by 13Z; 16th: overnight St
broke/dispersed by 10Z, glorious day of variable Ci thereafter; 19th: wind
strong from just before dawn to mid-afternoon, mainly F5/6, but 6(7) for a time
late AM to early PM; 22nd: dramatic display of mammatus associated with Cb
around midday; 23rd: heavy hail/rain showers in VCNTY, but only scrappy/light affairs
here - plenty of Cb cap/cal & detached anvils about; 24th: during second
hail event (1620-1632Z), grass/conservatory covered, and other surfaces almost
so [road became quite icy], with hail diameters 5-7mm, isol 8mm: notably
conical (hurt when hitting my head!) - drift of hail in one corner over 3cm
deep.
...
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
-05.1 03.2 -06.1 -
-01.5 05.1 -
- -
02
-04.2 03.6 -05.8 -
-00.7 06.6 -
- A
03 00.2
04.8 -02.9 - 03.2
09.3 - 03.6 B
04 05.7
07.7 04.7 03.6
07.5 09.5 tr
tr
05 04.0
08.9 02.2 tr(f)
04.8 09.8 -
tr
06 03.8
08.0 01.7 tr
05.5 09.6 -
00.1
07 03.5
07.2 01.5 00.1
03.3 07.5 02.4
02.4
08 00.7
04.8 -02.0 - 04.4 08.5 -
-
09 02.6
07.3 01.1 -
04.3 07.0 -
tr
10 00.3
05.0 -01.8 tr 02.1
05.0 tr tr
11 01.3
02.9 01.0 tr
02.4 05.5 tr
08.3
12 00.5
03.3 00.1 08.3
02.0 05.6 03.2
05.4
13 03.9
06.7 03.4 02.2
06.7 11.1 tr
02.7 C
14 06.9
09.2 06.1 02.7
09.2 10.2 02.2
02.2 D
15 07.9
10.4 06.9 tr
10.1 12.7 00.1
00.1 EF
16 10.5
12.1 10.4 tr
11.8 16.3 -
-
17 07.2
13.2 05.9 -
10.5 14.4 -
tr
18 07.1
11.7 05.1 tr
08.9 12.7 00.9
04.0
19 06.8
09.1 06.1 03.1
09.1 11.7 04.3
05.0 G
20 07.1
11.8 06.2 00.7
11.4 13.4 00.3
00.3 H
21 06.0 13.2 04.9 tr
07.3 11.4 01.5
01.5
22 03.2
08.6 01.2 -
05.8 09.4 01.1
02.2
23 01.8
06.4 00.6 01.1
04.8 08.3 00.3
00.8
24 02.9
06.3 01.3 00.5
04.3 08.3 06.8
06.8
25 00.1
04.7 -01.7 tr 03.7
08.2 00.8 00.8
26
-00.2 06.4 -02.2 tr
04.4 (08.7) - (00.8) I
27
(06--) ---- ---- (00.8) ---- (08.6)(tr) (00.3) I
28
(06--) ---- ---- (00.3) ----
09.3 (tr) (tr) I
29 05.8
08.6 03.3 -
07.4 12.9 - -
30 02.6
11.1 -00.2 - 07.3
14.8 - -
31 04.7
11.8 03.7 -
10.4 18.1 -
00.2
Remarks:
A. day
minimum (-0.7), also 24hr min for 3rd, occurred 02/09Z
B. day
minimum (3.2), also 24hr min for 4th, occurred 03/09Z
C.
night maximum (6.7), also 24hr max for 12th, occurred 13/09Z
D.
night maximum (9.2) occurred 14/09Z
E.
night maximum (10.4), also 24hr max 14th, occurred end night 14/15th
F. day
minimum (10.1), also 24hr min 16th, occurred 15/09Z
G. night
maximum (9.1) occurred 19/09Z
H.
night maximum (11.8), also 24hr max for 19th, occurred late night
I.
various estimated or missing data - see head of form; minima to nearest
whole degree only.
Mean
temperature (24hr) 1st to 15th March inclusive:- 5.1degC, which is 1.6C below
the *all* March mean.