1. OP GRITROCK
Saturday 11th April 2015
SIERRA LEONE MET ASSESSMENT

2. SATELLITE IMAGE Valid at 101515 Z Commentary
Clear skies in the northern interior.
Widespread low cloud on the coast. Thick enough in places for isolated showers.
Low cloud covering the far south. Showers on high ground likely in this area.
No active thunderstorms evident on this image.

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
C/V TS
TS C/V
Trafficability
Personnel
T / R R
Coastal (including FREETOWN) Z Z Z
Rotary
C/V
Airlift Operations
Trafficability
Personnel T
Extensive low cloud and mist in all parts at first, clearing through the morning.
Sunny spells in the afternoon but showers quick to form in the south, spreading to the coast and western parts.
Isolated showers turning thundery in the evening, mainly in the south, moving out to sea later in the night.
Low cloud and mist reforming but patchy.
Maritime/
Amphibious Z Z Z
Sea and Swell
Wind/Visibility V
Personnel
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.
General
06 Z
12 Z Z
24 Z
Illumination
Moon/Sun
rise/set
Sunrise: Z Sunset: Z
Moonrise: Z Moonset: Z
Min/Max mlx between
ECT and MCT
Min/Time: 1.7 ( Z)
Max/Time: 35 ( Z)
Moon Phase
Phase: 52% becoming 49% (Waning)
Favourable
Marginal
Unfavourable

4. Meteorological Impact Matrix Sierra Leone
Sun 12 APR
Mon 13 APR
Tue 14 APR
Areas of mist, low cloud and hill fog lifting during the morning.
Convective cloud and some isolated heavy showers or thunderstorms developing inland from mid afternoon, mainly across the south.
Showers or thunderstorms decaying after sunset with mist and patchy low cloud reforming overnight.
Areas of mist, low cloud and hill fog lifting during the morning.
Showers more extensive, heavy turning to thunderstorms in the south but more isolated in the north.
Showers or thunderstorms slowly decaying slowly through the evening.
Widespread mist and patchy low cloud reforming overnight.
Areas of mist, low cloud and hill fog lifting during the morning.
Convective cloud and some isolated heavy showers or thunderstorms developing inland from mid afternoon, mainly across the south and east.
Showers or thunderstorms decaying after sunset with mist and patchy low cloud reforming overnight.
Meteorological Impact Matrix
Sierra Leone
11/12
Darkness
Sun 12
Daylight
12/13
Mon 13
13/14
Tue 14
Rotary
TS/V C/V
C/V TS/V
C/V TS/V
TS/V C/V
Airlift Operations
Trafficability
R (South)
T / R
Personnel
T (inland) /
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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