1. UNCLASSIFIED OP GRITROCK SIERRA LEONE MET ASSESSMENT Saturday 20 th June 2015

2. UNCLASSIFIED 191430 Z SATELLITE IMAGE Valid at Commentary Overnight thunderstorms now out over the sea, and mostly decayed and clearing away westwards. Further thunderstorms developed offshore during the morning and are continuing. Remnants of cloud from overnight thunderstorms that formed well to the east of Sierra Leone which moved westwards this morning and decayed. As this cloud tends to break later this afternoon, and in response to afternoon heating, some scattered showers and thunderstorms are likely to develop, moving westwards into Sierra Leone and continuing into the evening. Note: Crosses indicate recent thunderstorm activity – red being from the last 10 minutes.

3. Forecast Valid: 0600 Z to 2359 Z Fronts / boundaries valid at 1200Z Issued by the JOMOC Sierra Leone Coastal (including FREETOWN) 0600-1200 Z1200-1800 Z1800-2359 ZRotary V / C TS / V Airlift Operations V / C TS / V Trafficability Wet ground Personnel R TT RR Inland SL 0600-1200 Z1200-1800 Z1800-2359 ZRotary V / CTS / V Trafficability Wet ground Personnel R T T RR Maritime/Amphibious 0600-1200 Z1200-1800 Z1800-2359 Z Sea and Swell Wind/Visibility VVV Personnel RRR General 06 Z 12 Z 18 Z24 ZIllumination Moon/Sunrise/set Sunrise: 0636 Z Sunset: 1913 Z Moonrise: 0955 Z Moonset: 2232 Z Min/Max mlx between ECT and MCT Min/Time: 1.7 (202300 Z – 210530 Z) Max/Time: >100 (from 210600 Z) Moon Phase Phase: 12% to 19% (Waxing) FavourableMarginalUnfavourable Residual showers and thunderstorms clearing west into the ocean or decaying. Areas of low cloud at first (especially in the east), and haze/mist, will disperse through the morning. Convective cloud will develop during the afternoon, with heavy showers and thunderstorms developing by late afternoon persisting through the evening, and continuing into the night. Haze, mist and low cloud will reform overnight, especially in the east. 2200

4. Meteorological Impact Matrix Sierra Leone 20/21 Darkness Sun 21 Daylight 21/22 Darkness Mon 22 Daylight 22/23 Darkness Tue 23 Daylight Rotary TS V / C V / C TSTS V / C V / C TSTS V / C V / C TS Airlift Operations TS V / C V / C TSTS V / C V / C TSTS V / C V / C TS Trafficability Locally wet Personnel RR/TR R Maritime VVVVVV Sun 21 st JUNTue 23 rd JUN Similar to Sunday. Mon 22 nd JUN Similar to Sunday. Residual showers and thunderstorms dying out, to leave areas of low cloud and haze or mist. This will disperse through the morning. Convective cloud will develop again during the afternoon, with further heavy showers and thunderstorms developing by late afternoon, persisting through the evening, and into the night. Haze, mist and low cloud will reform overnight.

5. UNCLASSIFIED Joint Operations Meteorology and Oceanography Centre Web www.jomoc.net RLI SLI www.jomoc.r.mil.uk www.jomoc.s.mil.uk Phone 01923958100 Email NAVYOPS-JOMOCGROUP@mod.uk Address JOMOC, Northwood HQ, Middx, HA6 3HP, UK Please leave any feedback regarding this product in the space below and return to us at JOMOC and we will endeavour to use this feedback to improve our services to you: