Summary for November 2004

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HEADLINE: MILD/DRY OVERALL. DAMP START & END: COLDER AROUND MID-MONTH

(last updated: 01/0900 DECEMBER)

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.

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TEMPERATURES ETC.

Highest day maximum (date):... 13.5(03)

Highest 24hr maximum (date):.. 13.5(03)

Lowest night minimum (date):...-01.5(14)

Lowest 24hr minimum (date):...-01.5(14)

Lowest overnight grass minimum (date):...-03.1(14)

[ number of days grass minimum < 0degC: ... 06 ]

[ Lowest day maximum (date):... 02.8(20)]

[ Highest night minimum (date):... 11.0(07)]

A. Mean Day (09-18Z) maximum: ... 10.1

A. Mean Night (18-09Z) minimum: ... 06.0

A. Mean of Day Max & Night min: ... 08.1

B. Mean 24hr maximum:... 10.3

B. Mean 24hr minimum:... 05.4

B. Mean of 24hr max & min:... 07.9 [+1.0 anomaly on eLTA of 6.9 degC]

(data below relate to 24 hr day beginning 09Z on date given)

Nr of days minimum at 09UTC <0.0degC:02[dates: 14-15]

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:

18th: on passage of cold front between 2020 & 2040Z, when wind veered sharply from SW to NE, temperature fell from the 24hr max. of 10.4degC to be 4.2degC by 2100Z;

20th/21st: classic 'inverted' profile, with 24hr min during afternoon of the 20th (during and following snow), and 24hr max end of the night (21/09Z) during slow airmass change;)

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PRECIPITATION (PPN/mm)

Total rainfall/melted snow etc:... 41.0 [62% of eLTA of 66 mm]

Highest 24hr total:............... 06.4(17)

No. days PPN total >= 0.2:15

No. days PPN total >= 1.0:10

No. days PPN total >=10.0:00

No. days PPN total >=25.0:00

(Notes relating to precipitation & allied observations:

1st/2nd: r(slight)/r late night, csd by ~ 0830Z;

2nd: dr(slight)/r(slight) AM, dying out early PM;

3rd: pr(slight) early hours & just before 09Z;

4th: r(slight)/r until ~ 0815Z;

6th: very light/intermittent r 0715-0845Z; further id(slight) during day;

6th/7th: d(slight)/f overnight – dr(slight/moderate) from ~08Z;

7th: ocnl dr(slight) during day;

7th/8th: dr(slight) much of night;

8th: ocnl dr(slight) AM;

8th/9th: dr(slight)/ocnl r through night;

9th: ocnl dr(slight) to 1530Z, then r(slight)/r, becoming light only by 18Z, and dying out around mid-evening;

10th: pr(slight) ~1525Z;

12th: drizzle/rain overnight & morning, dying out by 10Z; ir(slight) 1550-1630Z;

17th/18th: r(R) overnight, rain csd by ~18/0730Z;

18th: dr(slight/ocnl moderate) to 13Z; r(slight)/r from 1630Z to ~21Z;

20th: r(slight)/rs(slight) 0955Z onwards, with s(slight)/short period s, 1308-1355Z: by 20/18Z, rain(slight) only, and dr(slight) and/or r(slight) continued through night & early morning;

21st: further r(slight) then d(slight) until ~11Z;

26th: pr(very light) on couple of occasions 1030Z-1400Z; recent r(slight) at 18Z;

28th: r(slight)/ocnl r from early hours to ~0730Z; further r(mainly slight) from ~14Z: rain (slight/moderate) continued through evening 28th, and overnight 28th/29th, csd by 29/08Z;

30th: id(slight) PM;

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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:....... 01

Number of days snow lying at 09UTC:.... 00

Deepest snow cover (date,s):........... -

Number of days fog (visibility < 1km @ 09UTC).. 00

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Additional comments on the weather in November, 2004

12th: sharp airmass change (post-cold front) ~1615Z – skies clearing quickly thereafter.

18th: sharp airmass change (cold-front) evening – see note under temperature above.

20th: snow did not accumulate – surfaces too wet/well above zero.

... 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 06.7 10.3 03.9 - 09.4 12.2 tr 03.7 -

02 09.0 11.1 08.5 03.7 09.5 10.9 00.6 00.8

03 09.4 10.7 08.5 00.2 10.7 13.5 - 00.9 A

04 08.7 11.9 06.6 00.9 08.1 12.5 - -

05 04.4 08.0 02.5 - 05.7 11.5 - tr

06 06.7 08.3 04.6 tr 08.3 11.8 tr 01.1 B

07 11.0 11.3 10.6 01.1 11.0 12.4 00.6 01.9 C

08 09.2 11.4 08.1 01.3 10.4 11.7 00.3 02.5

09 08.8 10.5 08.6 02.2 08.4 09.2 05.0 05.9

10 04.5 08.3 02.2 00.9 06.0 09.7 tr tr

11 03.1 08.3 00.9 - 04.1 09.6 - 00.6 D

12 07.2 09.4 07.0 00.6 09.4 13.4 00.2 00.2 E

13 00.7 09.4 -01.3 - 01.6 06.4 - -

14 -01.5 02.9 -03.1 - -00.5 07.4 tr(X) tr X=frostmelt F

15 02.2 05.9 -00.3 - 06.0 09.6 - - GHI

16 08.6 09.1 08.0 - 09.0 12.4 - - J

17 10.1 11.6 09.1 - 11.1 13.0 - 06.4

18 08.7 11.7 08.2 06.4 08.4 10.2 02.8 04.9

19 00.4 10.4 -01.3 02.1 01.3 04.8 - - K

20 00.0 01.9 -01.9 - 01.6 02.8 04.3 05.5 L

21 01.7 04.6 01.5 01.2 04.6 09.8 00.2 00.2 MN

22 09.5 12.0 08.3 - 11.3 12.9 - - O

23 09.5 11.4 08.5 - 09.8 11.1 - -

24 09.1 10.1 08.3 - 09.7 10.5 - -

25 08.2 09.8 07.2 - 06.5 10.9 - tr

26 06.2 09.7 03.6 tr 09.6 12.5 tr tr P

27 06.0 10.7 03.9 - 06.1 09.4 - 02.0

28 05.8 08.8 04.6 02.0 05.2 06.5 01.3 04.4

29 04.7 06.6 03.5 03.1 03.3 07.3 - -

30 00.9 03.7 -01.1 - 03.7 07.6 tr tr QR

Remarks:

A. night max.(10.7) occurred 03/09Z

B. 24hr min. 6th(5.7) occurred 05/09Z

C. 24hr min. 7th(8.3) occurred 06/09Z

D. day min.(4.1), also 24hr min 12th, occurred 11/09Z

E. night max.(9.4) occurred 12/09Z

F. day min.(-0.5), also 24hr min 15th, occurred 14/09Z

G. grass min.(-0.3) occurred before 14/21Z/cloudier thereafter

H. night max.(5.9) occurred 15/09Z

I. day min.(6.0), also 24hr min 16th, occurred 15/09Z

J. day min.(9.0) was also the 24hr min 17th

K. night max.(10.4), also 24hr max 18th, occurred before 2020Z – see notes under temperature (above)

L. day min.(1.6), also 24hr min 21st, occurred late afternoon 20th

M. night max.(4.6), also 24hr max 20th, occurred 21/09Z

N. day min.(4.6), also 24hr min 22nd, occurred 21/09Z

O. night max.(12.0), also 24hr max 21st, occurred overnight 21st/22nd

P. night max.(9.7) occurred 26/09Z

Q. night min.(0.9)/grass min.(-1.1) occurred mid-evening 29th (as fog formed)

R. night max.(3.7) occurred 30/09Z

Number of occasions (24hr periods) THIS YEAR (2004)

maximum temperature >= 21degC (70degF) = 80

minimum temperature >= 16degC (61degF) = 13