Day 1 of 5 (0600 Wednesday 30th July to 0600 Thursday 31st July)

1. General Forecast - SEPD Region
Following a largely sunny start, cloud is expected to build through this morning. A few sunny spells this afternoon but also large amounts of cloud. Remaining mostly dry. Clearing skies this
evening and tonight.
Mean Dir'n Gust Mean Dir'n Gust Mean Dir'n Gust Mean Dir'n Gust
10 W 20 15 SW 20 15 W 20 10 W 20
10 W 20 15 W 25 15 W 20 15 W 25
5 W 15 10 NW 25 10 W 20 5 SW 20
10 W 10 10 SW 15 10 SW 10 10 SW 10
Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m)
0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A
0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A
Area
North East North West South East South West
Slough and West London Oxford, Reading & Melksham Aldershot & Portsmouth Poole & New Forest
Risk (RAG) Green Green Green Green
Temp (Max/Min) 24 12 24 12 24 12 24 11
Wind
06h-12h
12h-18h
18h-00h
00h-06h
Rain (mm)
06h-18h 0 - 0 0 - 0 0 - 0 0 - 0
18h-06h 0 - 0 0 - 0 0 - 0 0 - 0
Snow/Line Icing
06h-18h
18h-06h
Lightning
06h-18h 4 4 4 4
18h-06h 4 4 4 4
Scheduled Utilities Forecast - SEPD (South) - Wednesday 30 Jul 2014
Day 1 of 5 (0600 Wednesday 30th July to 0600 Thursday 31st July)

2. General Forecast - SEPD Region
A dry and sunny start but areas of cloud will soon drift in from the north-west bringing the chance of one or two showers. South-eastern areas are most likely to escape dry. Any showers will
tend to clear through the evening leaving a mostly dry night with clear spells.
Mean Dir'n Gust Mean Dir'n Gust Mean Dir'n Gust Mean Dir'n Gust
10 W 20 15 SW 25 15 SW 20 15 W 20
10 SW 25 15 SW 25 15 SW 25 10 SW 25
10 SW 20 15 SW 25 10 W 20 10 SW 20
10 SW 10 15 SW 15 10 SW 10 10 SW 15
Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m)
0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A
0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A
Area
North East North West South East South West
Slough and West London Oxford, Reading & Melksham Aldershot & Portsmouth Poole & New Forest
Risk (RAG) Green Green Green Green
Temp (Max/Min) 25 13 24 12 24 13 24 13
Wind
06h-12h
12h-18h
18h-00h
00h-06h
Rain (mm)
06h-18h 0 - 1.0 0 - 1.0 0 - 1.0 0 - 1.0
18h-06h 0 - 0 0 - 0 0 - 0 0 - 0
Snow/Line Icing
06h-18h
18h-06h
Lightning
06h-18h 3 3 3 3
18h-06h 4 4 3 4
Day 2 of 5 (0600 Thursday 31st July to 0600 Friday 1st August)

3. General Forecast - SEPD Region
Showers developing through the morning. Further
showers in to the afternoon with a growing chance of
lengthier spells of rain edging in to more western
areas. This rain will linger in to the night. However,
only a few showers are likely in the east. There is a
small risk of infrequent lightning from embedded
thunderstorms in more western parts although
confidence is rather low.
General Forecast - SEPD Region
Showery rain with infrequent lightning is possible in
the morning, gradually easing away in the afternoon.
Mostly dry by evening with just an odd shower
possible overnight.
General Forecast - SEPD Region
Occasional showers but in general, plenty of dry
weather with sunny or clear spells.
Mean Dir'n Gust Mean Dir'n Gust Mean Dir'n Gust
20 SW 30 20 S 30 20 SW 30
Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m) Snow (cm) Line Icing Height (m)
0.0 Nil N/A 0.0 Nil N/A 0.0 Nil N/A
Day 3 of 5 (0600 Friday 1st August to 0600 Saturday
2nd August)
Day 4 of 5 (0600 Saturday 2nd August to 0600
Sunday 3rd August)
Day 5 of 5 (0600 Sunday 3rd August to 0600
Monday 4th August)
Area
Day Three Day Four Day Five
SEPD Region SEPD Region SEPD Region
Risk (RAG) Green Green Green
Temp (Max/Min) 24 13 24 11 24 12
Wind
24 hours
Rain (mm) 24 hour total 24 hour total 24 hour total
24 hours 0 - 11 0 - 9 0 - 1
Snow/Line Icing
24 hours
Lightning
24 hours 2C 2C 3
Days 6 to 10 (0600 Monday 4th August to 0600 Saturday 9th August)
Outlook
Low pressure is likely to dominate. Spells of rain are likely at times, interspersed with some drier periods.

4. Rainfall (mm)
12 hr (days 1 and 2) 24 hr (days 3 to 5)
>50 >50
>=25 >25
<25 <=25
Snowfall (cm)
12 hr (days 1 and 2) 24 hr (days 3 to 5)
if 24hr total >=10 >=3 >=5
>1 >=1
<=1 <1
if 24hr total >=5 >1
<=1
if 24hr total <5 any amount
Overall risk of disruption
Severe risk Red
Significant risk Amber
No risk Green
The above reflects the worst case of any of the following
Wind Gusts (mph) - 1st November - 31st March
Direction N/NE/E All other directions
>50 mph Red >70 mph Red
>40 mph Amber >50 mph Amber
<=40 mph Green <=50 mph Green
Wind Gusts (mph) - 1st April - 31st October
Direction N/NE/E All other directions
>40 mph Red >60 mph Red
>30 mph Amber >40 mph Amber
<=30 mph Green <=40 mph Green

5. Line icing
12 hr (days 1 and 2) 24 hr (days 3 to 5)
Severe Severe
other 12hr > Nil Moderate Moderate
other 12hr = Nil Moderate Slight
Slight Nil
Nil
Lightning risk and disruption colour code matrix
Risk level 1 A B C D
Risk level 2 A B C D
Risk level 3 A B C D
Risk level 4 A B C D
Lightning Risk Categories
1 - Lightning will almost certainly occur across the region, or is occurring
2 - Lightning is likely across the region
3 - Lightning is unlikely across the region, although convective activity or an active front is forecast
4 - Lightning is not expected to occur across the region
Lightning Intensity Index
A - Very frequent lightning strikes
B - Frequent lightning strikes
C - Infrequent lightning strikes
D - Very infrequent lightning strikes
All Temperatures in °C
All Wind speeds in MPH