1. OP GRITROCK
Tuesday 21st April 2015
SIERRA LEONE MET ASSESSMENT

2. SATELLITE IMAGE Valid at 201400 Z Commentary
Broken convective cloud building across Sierra Leone.
Thunderstorms (crosses – Red last 10 minutes). Notably across eastern Guinea.

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
C/V/TS
TS/C/V C/V
Trafficability
Wet ground
Personnel
T/ R
R (mainly E)
Coastal (including FREETOWN) Z Z Z
Rotary
C/V/TS
C/V
Airlift Operations
Trafficability
Personnel R T
Early low cloud, mist and haze, particularly around the coasts.
Isolated showers and thunderstorms developing across the coastal fringe by late morning and across inland parts during the afternoon and evening.
Showers and thunderstorms lingering into the early hours of the morning over the higher ground in the east of the country.
Low cloud with haze and mist reforming overnight.
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 – Z)
Max/Time: > 100 (TL Z and FM Z)
Moon Phase
Phase: 9 % becoming 11 % (Waxing)
Favourable
Marginal
Unfavourable

4. Meteorological Impact Matrix Sierra Leone
Wed 22 APR
Thu 23 APR
Fri 24 APR
Early low cloud, mist and haze, particularly around the coasts.
Isolated showers and thunderstorms developing by midday and becoming heavier and more extensive during the afternoon and into the evening, notably in south and east.
Scattered showers and storms slowly decaying overnight and areas of low cloud, haze and mist reforming by dawn, especially in the south and near/on coasts.
Early low cloud, mist and haze, particularly around the coasts.
Isolated showers and thunderstorms developing by midday and becoming heavier and more extensive during the afternoon and into the evening, notably in south and east.
Scattered showers and storms slowly decaying overnight and areas of low cloud, haze and mist reforming by dawn, especially in the south and near/on coasts.
Similar to Thu.
Meteorological Impact Matrix
Sierra Leone
21/22
Darkness
Wed 22
Daylight
22/23
Thu 23
23/24
Fri 24
Rotary
TS/V C/V
C/V TS/V
TS/V C/V
Airlift Operations
Trafficability
R (isol E)
R (isol, mainly SE)
R (isol SE)
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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