1. OP GRITROCK
Thursday 28th May 2015
SIERRA LEONE MET ASSESSMENT

2. SATELLITE IMAGE Valid at 271530 Z Commentary
Developing convective cloud, over southern Sierra Leone.
New deep convection developing to the east, likely to become widespread again during the evening.
Storms associated with the ITCZ.
Note:
Crosses indicate recent thunderstorm activity – red being from the last 10 minutes.
NB: Most are displaced south of the actual cells.

3. Coastal (including FREETOWN)
Sierra Leone
Forecast Valid: 0600 Z to 2359 Z
Fronts / boundaries valid at 1200Z
Issued by the JOMOC
Inland SL Z Z Z
Rotary
V / C TS / V
TS / V
Trafficability
Wet ground
Personnel R
T / R
Showers or thunderstorms slowly dying out, but redeveloping again in the north and east by mid afternoon, and spreading quickly southwest to other areas during the evening, becoming widespread, and then persisting into the night.
Areas of low cloud, with mist and isolated fog patches, clearing after dawn, but remaining hazy near the coast.
Coastal (including FREETOWN) Z Z Z
Rotary
V / C TS / V
TS / V
Airlift Operations
V / C TS / V
Trafficability
Wet ground
Personnel R
T / R
Maritime/
Amphibious Z Z Z
Sea and Swell
Wind/Visibility V
Personnel R
Millilux levels are given using clear sky values, with no cultural light and given as upward illumination, and should only be used for situational awareness and not tactical flying. Illumination data is for the upcoming night.
General
06 Z
12 Z Z
24 Z
Illumination
Moon/Sun
rise/set
Sunrise: 0633 Z Sunset: 1907 Z
Moonrise: 1503 Z Moonset: Z
Min/Max mlx between
ECT and MCT
Min/Time: 1.7 ( Z)
Max/Time: >100 ( Z)
Moon Phase
Phase: 71% becoming 79% (Waxing)
Favourable
Marginal
Unfavourable

4. Meteorological Impact Matrix Sierra Leone
Thu 30th MAY
Fri 31st MAY
Sun 01st JUN
Showers or thunderstorms slowly dying out, but redeveloping again in the north and east by mid afternoon, and spreading quickly southwest to other areas during the evening, becoming widespread, and then persisting into the night.
Areas of low cloud, with mist and isolated fog patches, clearing after dawn, but remaining hazy near the coast.
Similar.
Similar.
Meteorological Impact Matrix
Sierra Leone
27/28
Darkness
Thu 28
Daylight
28/29
Fri 29
29/30
Sat 30
Rotary
TS V / C
V / C TS
TS V / C
V / C TS
Airlift Operations
Trafficability
Locally wet
Personnel R
Maritime V 4

5. Joint Operations Meteorology and Oceanography Centre
Web
RLI SLI
Phone
Address
JOMOC, Northwood HQ, Middx, HA6 3HP, UK
Contact Information
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