1. OP GRITROCK
Sunday 13th September 2015
SIERRA LEONE MET ASSESSMENT

2. SATELLITE IMAGE Valid at 121600 Z Commentary
An easterly wave to the north, should continue westwards, missing Sierra Leone.
Elsewhere unstable conditions across west Africa this evening, with more isolated thunderstorms, these still developing though, but they don’t look very well organised, and should decay after sunset.
To the east quiet conditions, and these expected over Sierra Leone on Sunday.
Note:
Crosses indicate recent thunderstorm activity – red being from the last 10 minutes.

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 / C
Trafficability
Wet ground
Personnel
T / R R
Coastal (including FREETOWN) Z Z Z
Rotary
V / C
TS / V / C
Airlift Operations
Trafficability
Wet ground
Personnel R
Early mist, haze, and low cloud, lifting into convective cloud during the morning.
A quieter day is expected on Sunday, with only isolated heavy showers or thunderstorms developing during the afternoon, lasting into the evening, before largely dying out.
Mist, haze or low cloud developing again overnight.
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 Z Z Z
Illumination
Moon/Sun
rise/set
Sunrise: 0643 Z Sunset: 1855 Z
Moonrise: 0647 Z Moonset: 1910 Z
Min/Max mlx between
ECT and MCT
Min/Time: 1.7 ( Z – Z)
Max/Time: >100 (0610 Z – 1925 Z)
Moon Phase
Phase: 0% decreasing to 0.5% (waxing)
Favourable
Marginal
Unfavourable

4. Meteorological Impact Matrix Sierra Leone
Mon 14th SEP
Tue 15th SEP
Wed 16th SEP
Mist, haze, and low cloud will lift into convective cloud during the morning.
Scattered heavy showers or thunderstorms will develop through the afternoon, perhaps with a more active spell of thunderstorms spreading from the east during the evening, and lasting into the night.
Widespread low cloud, haze and mist will reform overnight.
Similar to Monday.
Similar to Tuesday.
Meteorological Impact Matrix
Sierra Leone
14/09
00-06Z
06-12Z
12-18Z
18-00Z
15/09
16/09
Rotary
V/C
V/C/TS
TS/V
TS/V/C
V/C TS
Airlift Operations
Trafficability
Wet
Personnel R
Maritime
Swell 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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