Summary for June 2005

=====================

HEADLINE:DRY. SETTLED/COOL FIRST HALF; WARM/HOT SECOND HALF:THUNDERY END

(last updated: 01/0900 JULY)

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):... 31.8(19)

Highest 24hr maximum (date):.. 31.8(19)

Lowest night minimum (date):... 03.5(07)

Lowest 24hr minimum (date):... 03.5(07)

Lowest overnight grass minimum (date):... 00.9(07)

[ number of days grass minimum < 0degC: ... 00 ]

[ Lowest day maximum (date):... 16.0(01)]

[ Highest night minimum (date):... 19.0(20)]

A. Mean Day (09-18Z) maximum: ... 22.1

A. Mean Night (18-09Z) minimum: ... 12.1

A. Mean of Day Max & Night min: ... 17.1

B. Mean 24hr maximum:... 22.2 [+2.1]

B. Mean 24hr minimum:... 12.0 [+1.4]

B. Mean of 24hr max & min:... 17.1 [+1.8 anomaly on eLTA of 15.3degC]

(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:14

Nr of days maximum at 09UTC >=25degC:09

Nr of days maximum at 09UTC >=30degC:02[dates: 19,23]

(Notes relating to temperature & allied observations:

6th/7th: air minimum of 03.5 degC: probably one of the 10% of coldest early summer nights in the last half-a-century in the local area.

The overall 24hr/daily mean temperature anomaly of +1.8degC disguises a marked change that occurred after mid-month: up to/including 16th, the anomaly on the whole-month eLTA was struggling at around –1degC: of those 16 days, only 4 experienced maxima >20°C. In the period 17th onwards, only 2 days failed to achieve that value, with two days [19th & 23rd] exceeding 30°C.)

=================================

PRECIPITATION (PPN/mm)

Total rainfall/melted snow etc:... 29.9 [54% of eLTA of 55mm]

Highest 24hr total:............... 09.3(03)

No. days PPN total >= 0.2:11

No. days PPN total >= 1.0:06

No. days PPN total >=10.0:00

No. days PPN total >=25.0:00

(Notes relating to precipitation & allied observations:

1st: ir(slight) 08-0830Z/credited to May dataset; ocnl dr(slight) morning – dr(slight)/r(slight) afternoon;

2nd: d(slight) ~0830Z;

3rd: pr(slight) ~ 1415; r(slight) 1505Z, becoming r(R) between 1530 & 1625Z, with tl(slight) ~1600Z & 1620Z [see below]; rain ceased just after 1800Z;

4th: pr(slight) ~ 0630Z; further light showers during day, but overall, a dry day;

5th: few spots light rain ~11Z: id(slight) ~18Z;

5th/6th: ocnl r(mainly slight) overnight;

6th: id(very light) 09-10Z;

12th: ir(slight) 03-04Z; r(slight) 1530-1600Z;

15th: r(slight), ocnl r, from 0540Z, bec dr(slight) by 0930Z, csd by 1115Z;

16th: idr(mainly light) from ~08Z, bec r(slight)/r 1005Z, csd by 1130Z;

17th: id(very light) from ~08Z, csd by 10Z;

24th: r(slight)/r 1105Z-1200Z (with slight thunderstorm 1050-1150Z); r(slight)/r 1400-1620Z (with slight thunderstorm 1405-1610Z, though more activity than first one); r(slight)/r 1710Z – 21Z;

25th: idr(very light) from ~ 1730Z, dying out early evening;

28th: ir(very light/few spots) from Ac ~ 0630Z; r(slight) 1745Z, becoming r, ocnl R (assw tl) between 1815 & 1850Z, csd by 1915Z;

29th: ir(slight) after 20Z;

30th: r(slight)/r from ~05Z to ~10Z; further light rain/showers through day, ceased by ~19Z; )

=================================

OTHER TOTALS

Number of days thunder heard: (dates).. 03 (03,24,28)

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 June, 2005

3rd: slight thunderstorm (single flash / muffled bang) around 1600Z, with further distant rumbles ~ 1620Z: probably high-base CB and / or mid-level instability on increasingly active (eastward-moving) trough which turned suddenly thundery as is passed overhead – ocnl heavy rain associated (see rainfall log elsewhere);

24th: slight thunderstorm (irregular/infrequent activity) 1050Z-1150Z, with ocnl moderate rain (0.9mm) & short period of squally winds, though never above Bft5; slight, ocnl moderate thunderstorm (circa 1 flash/bang per 30s) 1405Z-1610Z, with periods moderate rain (5.6mm).

28th: slight thunderstorm activity began 1805Z (light rain), then 'moderate' activity 1840-1850Z (~ 5 to 10 flashes/min) mainly CC/IC, only 2 CG seen here), then 'ceased' as an active local ts by 1900: however, note that *distant* thunder could be heard up to at least 22Z (northern horizon activity) assw very active cells reported there – we missed out on the most intense activity this day.

... 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 09.8 18.2 07.6 tr 13.7 16.0 00.8 00.8 -

02 13.5 15.8 13.4 tr 15.1 16.6 - -

03 11.2 16.5 09.7 - 12.1 20.7 09.3 09.3

04 10.9 14.9 09.9 tr 14.8 19.1 tr tr A

05 11.5 16.5 09.9 - 14.8 17.5 tr 00.8

06 12.6 14.7 12.2 00.8 12.8 16.2 tr tr

07 03.5 15.0 00.9 - 12.1 18.5 - -

08 05.6 17.7 03.0 - 15.5 21.9 - -

09 07.1 20.6 04.3 - 18.2 22.6 - -

10 14.1 21.2 11.9 - 15.7 19.0 - -

11 05.1 15.7 02.1 - 13.7 18.5 - 00.2

12 10.8 16.5 10.2 00.2 13.9 19.1 tr tr B

13 05.3 15.0 03.5 - 15.0 19.4 - -

14 07.8 17.8 06.2 - 15.4 20.0 - 02.5

15 10.9 17.4 09.4 02.5 13.1 20.8 00.2 00.2

16 13.9 18.6 12.9 tr 15.3 19.1 01.2 01.2 C

17 16.6 19.9 15.5 tr 19.7 25.5 tr tr D

18 14.5 24.8 12.3 - 24.8 29.4 - -

19 18.0 28.1 16.5 - 28.1 31.8 - - E

20 19.0 28.7 ---- - 21.6 27.7 - - F

21 13.2 26.2 11.5 - 20.x 26.0 - - G

22 13.3 24.2 ---- - 23.2 29.6 - - H

23 14.2 27.7 11.8 - 25.8 30.3 - -

24 16.4 28.1 14.1 - 18.3 23.7 07.6 08.7

25 16.7 19.1 15.7 01.1 16.6 18.4 tr tr I

26 12.2 16.6 12.3 tr 13.6 21.2 - -

27 11.3 20.4 10.0 - 18.1 26.0 - tr

28 13.9 25.3 13.2 tr 20.3 25.7 tr 04.4

29 14.3 21.1 13.4 04.4 17.5 24.7 - 01.3

30 14.3 22.7 14.0 01.3 16.1 18.9 00.3 00.5 J

Remarks:

A. night max.(14.9) occurred 04/09Z

B. night max.(16.5) occurred 12/09Z

C. day min.(15.3)/also 24hr min. 17th/occurred morning 16th

D. night max.(19.9)/also 24hr max. 16th/occurred just before 09Z 17th

E. night max.(28.1) occurred 19/09Z

F. no grass min: index stuck

G. day min.(20.x) estimated as thermometers removed from screen whilst drilling in progress on house.

H. no grass min: index stuck

I. day min.(16.6) occurred 25/18Z

J. The 24hr max for this day actually occurred at 01/09Z July (19.1)

Number of occasions (24hr periods) THIS YEAR (2005)

maximum temperature >= 21degC (70degF) = 19

minimum temperature >= 16degC (61degF) = 05

Rainfall anomaly this year (so far) = 64% (was 66% end May)

Running 12 month temperature anomaly: +0.8 degC (similar to last month)

Running 12 month rainfall anomaly: 78% (was 77% last month)

Using a composite Easthampstead Park/Tawfield series (1971-2004), the three driest (any) 12 month periods are:-

Rank: total: 12months to:

1. 379mm August 1976

2. 394mm March 1973

3. 397mm February 1991

this event (so far), the 12 month total is 532mm

For 24 month periods. the three driest in the same series are:-

1. 863mm February 1992

2. 1009mm June 1973

3. 1055mm April 1997

this event (so far), the 24 month total is 1153mm