The surface weather (synoptic) chart shows that moist Southwesterly winds originating and blowing from the Atlantic Ocean are established and have reached their Northernmost position, within Niger and Chad republics; for today, they have maintained their position and are located around Lat. 23.8oN in the Western sector and to Lat. 22.0oN in the Eastern sector, all outside the country. The Inter Tropical Discontinuity (ITD) which is the indicator to measure the extent of the moist Southwesterly winds has remained far North of Bilma (18.7oN) in Niger republic whilst also continuing it’s movement further North of Faya (18.0oN) in Chad republic, both to the Western and Eastern sector respectively (Both stations are the farthest and Northernmost synoptic observing stations in Niger and Chad republics respectively). The surface low pressure centre located over the Arabian peninsula has remained in phase with the mid-latitude trough which has largely hindered its motion; a trough of low pressure extends from the Arabian low pressure cell across East Africa into the West African sub-region including Nigeria. The South Atlantic anticyclone (also known as St. Helena high pressure cell) located in the Southern Hemisphere remained established and continued to extend it’s ridge of high pressure into West Africa. As the ITD continue it’s Northward movement, more moisture influx into all parts of Nigeria, Niger and Chad republics are sustained.
The 1500GMT satellite imagery of today, shows the remnant of convective cells formed overnight over the Central and Northeastern states are slowing moving westwards and were responsible for this afternoon thunderstorms over places including Abuja. Fresh convective cells are also developing over Borno/Adamawa states in the Northeast, over the Mambilla high grounds and extends across the border into Cameroon republic, in parts of the Southwest and Coastal areas in the South-South.
Sunny, partly cloudy to cloudy conditions will affect parts of the Northern states while isolated thunderstorms are expected to affect areas in the Northeast and Northwest in the afternoon/evening. Cloudy conditions will be prevail in the Central states with chances of scattered thunderstorms affecting places especially in the high grounds during the evening/night period. The Southern parts will be mainly cloudy with showers likely to develop in the afternoon; however, thunderstorms are expected to affect places in the Southeast and parts of the Coastal states during the afternoon/evening periods.