OP GRITROCK Sunday 13th September 2015 SIERRA LEONE MET ASSESSMENT

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.

Coastal (including FREETOWN) Sierra Leone Forecast Valid: 0600 Z to 2359 Z Fronts / boundaries valid at 1200Z Issued by the JOMOC Inland SL 0600-1200 Z 1200-1800 Z 1800-2359 Z Rotary V / C TS / V / C Trafficability Wet ground Personnel T / R R Coastal (including FREETOWN) 0600-1200 Z 1200-1800 Z 1800-2359 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 0600-1200 Z 1200-1800 Z 1800-2359 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 18 Z 24 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 (121955 Z – 130545 Z) Max/Time: >100 (0610 Z – 1925 Z) Moon Phase Phase: 0% decreasing to 0.5% (waxing) Favourable Marginal Unfavourable

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

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