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NOVEMBER 2009
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| 1st - 7th | 1st, a stormy start, LP 988 hPa off Pembrokeshire tracking NE and deepening, warm and cold fronts bring persistent rain - sometimes heavy - through the morning from 08.30 to 13.00h. 3rd, LP 966 hPa coast of N Scotland, light rain and drizzle from 3am to 10am from warm front followed by heavy showers from cold front from 12.30 for an hour. 4th, moderate rain shower pm. 5th, light rain shower late pm. 6th, mainly cloudy with light rain late pm followed by heavier showers in evening. 7th, a sunny day with light rain from 22.30h into the following morning. |
| 8th - 12th | 8th, LP 994 hPa English Channel, HP 1033 hPa Azores, moderate rain after midnight followed by heavier showers before dawn. 9th LP moved ENE allowing a weak ridge of HP, sunny periods after early mist (precipitation from condensation). 10th, a foggy morning and and a mainly dull day with drizzle in the afternoon. 11th, another dull day with light rain showers. 12th, bright start clouding over with moderate/heavy rain evening and night. |
| 13th - 16th | Stormy and very wet. 13th - wettest day here since 23/11/2003 - vigorous LP with triple point centres 971 hPa to NW, 972 hPa to W and 981 hPa to SW showing cyclogenesis with numerous fronts. Moderate / heavy showers very early followed by persistent heavy rain from 05.00 to 09.00, especially heavy around 08.00 and further heavy rain until early afternoon. 14th, heavy showers and some violent squalls after midday. 15th, LP 968 hPa Faeroe I, calmer conditions, moderate rain very early am from occlusion followed by a trough with heavy/very heavy rain from 04.30 to 07.00. 16th, LP 986 & 982 hPa over Ireland. 16th, heavy showers early am. |
| 17th - 23rd | Very unsettled. 18th, LP 982 hPa Denmark, LP 956 hPa 20° W Atlantic, light showers very early am. 20th, light rain from 06.15 to past midday. 21st LP 954 hPa 20° W Atlantic, light rain from midafternoon through eveing and night. 22nd, LP 962 hPa near Donegal, frequent moderate and heavy showers, some squally one with hail. 23rd, yet more rain and showers mostly am. |
| 24th - 30th | Continuing very unsettled and windy. 24th, a rather dull day with drizzle after 18.00h from warm front. 25th, LP 958 hPa N of Hebrides, squally showers very early am as cold front passes then bright with a heavy rain shower pm. 26th, again squally showers early on, one very heavy, with another shower pm and rain early in the night. 27th, LP 972 hPa central Norway and 977 hPa near Shetland, more moderate rain before dawn from occlusion. 28th, moderate rain from cold front from 01.00 finishing with one very heavy downpour around 05.00 then light/moderate rain from warm front after 17.30 with heavy showers later. 29th, LP 969 hPa Devon, cold front bring yet more heavy showers intermittently from midnight through the morning and more intermittently in the afternoon but one thundery. |
| NOVEMBER 2009 MONTHLY SUMMARY |
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| ‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is limited. The sensor receives only up to 40 - 55% of total possible sunshine exposure this month due to obstruction. There is no allowance for sunshine by visual observation only, so the sunniest day figures above can be very significantly less than the actual daily sunshine duration. THW = Shaded Heat Index calculated with cooling/warming effect of wind and humidity to give an apparent temperature. THSW = Unshaded Heat Index calculated with cooling/warming effect of wind, humidity and full direct sunshine to give an apparent temperature. EVAPO-TRANSPIRATION is drying effect due to sun and wind, and is equivalent to "negative rainfall" |
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DAILY STATS NOVEMBER 2009 |
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TEMPERATURE ºc |
HUMIDITY |
SUN ‡ |
PRESSURE |
RAINFALL |
WIND SPEED |
DIRECTION |
WEATHER NOTES ‡ |
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DATE |
Low (21-09h) |
High (09-21h) |
Temp at 14.00z |
RH % at 14.00z |
Dewpoint ºc at 14.00z |
Bright sun hrs |
hPa at 14.00z |
Day Total (mm) |
Average (mph) |
Max Gust (mph) |
Dominant (Compass) |
Precipitation type etc ‡ |
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1st |
9.4 | 16.1 | 15.3 | 89 | 13.5 | 0.3 | 995.8 | F | 15.2 | 3.8 | 27 | SW | Rain am. |
2nd |
6.3 | 12.3 | 11.8 | 59 | 4.0 | 5.2 | 1000.1 | FS | 0.0 | 1.7 | 13 | SSW | Sunny. |
3rd |
8.4 | 13.7 | 11.9 | 87 | 9.8 | 0.2 | 983.3 | F | 7.1 | 2.3 | 26 | SW | Rain am. |
4th |
5.4 | 11.8 | 11.1 | 62 | 4.0 | 4.3 | 985.3 | FS | 1.0 | 2.4 | 18 | SW | SHRA pm. |
5th |
7.3 | 11.8 | 11.3 | 69 | 5.8 | 2.5 | 993.5 | R | 0.3 | 2.3 | 13 | SW | SHRA pm. |
6th |
7.2 | 11.5 | 10.9 | 72 | 6.1 | 0.3 | 1000.2 | F | 4.6 | 2.2 | 19 | SSW | Rain pm |
7th |
4.4 | 10.1 | 10.1 | 61 | 2.9 | 4.5 | 995.7 | ST | 1.0 | 1.2 | 11 | SSW | Rain night |
8th |
6.6 | 8.7 | 8.5 | 85 | 6.1 | 0.0 | 1005.6 | R | 6.6 | 0.4 | 12 | SE | Rain am |
9th |
3.6 | 7.9 | 7.7 | 81 | 4.7 | 3.8 | 1017.5 | FS | 0.3 | 0.7 | 10 | N | Sunny pm |
10th |
1.8 | 6.9 | 6.5 | 92 | 5.3 | 0.0 | 1010.2 | F | 0.5 | 0.1 | 6 | SW | Fog am, drizzle pm |
11th |
5.1 | 9.4 | 9.4 | 92 | 8.2 | 0.1 | 1004.8 | F | 0.8 | 0.5 | 18 | SE | SHRA |
12th |
7.3 | 13.3 | 13.3 | 76 | 9.2 | 1.8 | 1001.4 | FS | 4.3 | 3.4 | 22 | SW | Rain eve & night |
13th |
9.6 | 15.3 | 12.9 | 91 | 11.5 | 0.0 | 998.1 | FS | 35.1 | 3.8 | 28 | SW | Rain |
14th |
11.4 | 13.3 | 11.8 | 81 | 8.6 | 0.2 | 990.1 | F | 5.6 | 7.1 | 44 | SW | SHRA+ |
15th |
8.1 | 12.9 | 12.3 | 77 | 8.4 | 2.8 | 1004.8 | ST | 8.4 | 1.5 | 12 | SSW | Rain am |
16th |
7.3 | 13.1 | 12.6 | 63 | 5.7 | 1.0 | 1000.7 | RQ | 4.1 | 4.9 | 26 | SW | SHRA+ am |
17th |
9.8 | 12.9 | 12.3 | 64 | 5.7 | 2.3 | 1007.5 | ST | 0.0 | 4.7 | 19 | SW | Sunny spells |
18th |
10.1 | 14.3 | 14.3 | 68 | 8.5 | 0.5 | 1011.4 | RS | 0.8 | 8.3 | 30 | SW | Rain am. Cloudy |
19th |
11.9 | 13.2 | 13.0 | 65 | 6.6 | 3.0 | 1011.9 | FS | 0.0 | 6.1 | 22 | SW | Sunny spells |
20th |
12.0 | 13.6 | 13.1 | 87 | 11.0 | 0.0 | 1013.1 | R | 5.1 | 4.0 | 25 | SW | Rain am. |
21st |
7.3 | 14.9 | 14.1 | 77 | 10.1 | 1.2 | 1011.1 | F | 8.4 | 2.7 | 19 | SW | Rain pm. |
22nd |
7.7 | 11.4 | 9.6 | 80 | 6.3 | 0.5 | 999.0 | F | 5.6 | 6.1 | 28 | SW | SHRA+ |
23rd |
8.2 | 12.8 | 12.5 | 85 | 10.0 | 0.5 | 995.3 | F | 4.1 | 6.0 | 26 | SW | Rain am |
24th |
8.7 | 13.7 | 13.5 | 72 | 8.5 | 0.5 | 1006.5 | FS | 0.8 | 6.6 | 34 | SW | Rain night |
25th |
8.8 | 11.2 | 9.6 | 71 | 4.6 | 1.5 | 999.3 | ST | 4.3 | 5.8 | 31 | SW | SHRA+ |
26th |
7.0 | 9.7 | 9.4 | 69 | 4.0 | 1.3 | 1001.0 | FS | 6.3 | 4.5 | 27 | SW | SHRA+/++ |
27th |
4.6 | 8.6 | 8.0 | 73 | 3.5 | 0.3 | 998.8 | ST | 5.3 | 2.9 | 19 | SSW | Rain am |
28th |
5.5 | 8.4 | 7.7 | 66 | 1.7 | 0.6 | 993.7 | ST | 21.8 | 3.0 | 24 | SW | Rain / SHRA++ |
29th |
6.1 | 10.3 | 8.3 | 74 | 4.0 | 0.0 | 984.3 | FS | 17.3 | 2.7 | 25 | SW | Rain / SHRA++ |
30th |
5.0 | 6.7 | 5.6 | 85 | 3.2 | 0.1 | 999.2 | RQ | 7.1 | 2.6 | 20 | N | Rain am |
| ‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is rather limited. The sensor receives approx 65% of total possible sunshine exposure this month, and there is no allowance for sunshine by visual observation only, so the figures above can be very significantly less than the actual daily sunshine duration. |
| Barometer trend (previous 3 hours) : F = falling, ST = steady, R = rising; Q = quickly, S = slowly |
| ‡ Weather Notes may use METAR codes: SHRA = rain showers; '+' = heavy; |