@MostafaELShakaa The fact of the matter is nobody knows how much water will flow down the Nile this year. Only God knows & there may be a lot more than 85 BCM. Last year and 2016 saw flooding. This year's West Africa Monsoon (WMA) looks unusually strong.
@MostafaELShakaa The small rainy season started on Ramadan, April 13th and rains have been steadily increasing.
Today's forecasts (10 days of accumulated Rain) for the Horn of Africa are below from the EU/US and Korean weather models. These show very strong rainfall.
@MostafaELShakaa In response to your April 1st tweet. Ethiopia does not want to take any water from Egypt. It simply wants to generate electricity from it before it leaves Ethiopia. The storage capacity of the GERD will likely improve Egypt's ability to utilise Nile flow as it will make it even.
@MostafaELShakaa Ethiopia is seeking to negotiate how to arrange this years impound of water. Last year the impound took only 12 days.
It is possible that this year - if rains are heavy as expected, the #GERD will smooth the flow, avoiding flooding downstream. But this needs to be agreed.
@MostafaELShakaa Here is a live picture (as of 3pm today) of the upstream areas of the lower Nile Basin. As you can see there is plenty of cloud activity - and each day there is rain. The area of cloud cover is 1.3 million square kms - an area today which is 200k kms2 larger than Egypt.
@MostafaELShakaa However, @MostafaELShakaa, 86% of the water that reaches Egypt comes from the Blue Nile Basin alone. Roughly speaking this part of the larger map below, which is 325,000 sq Kms... and most of that from the highlands part of this.
21st April 2021 - Middle East #ArabianStorms rainfall forecast update:
10 day forecasts from the GFS, CMC, KMA and GEFS models. /1
21st April 2021 - 3 day rainfall forecasts from the same models - to midnight Friday.
21st April 2021 - long range rainfall forecasts into next week (16 days to midnight Thursday) from the GFS, GEFS (ensemble) and KMA (12 days to midnight Sunday) models. #ArabianStorms
Europe may now have a very wet final 2 weeks of Spring, rather than a very cold one. Question is, how wet? Catastrophically so... or just wet wet. threadreaderapp.com/thread/1384500…
The question posed by the burst of high energy West Africa Monsoon air on Friday which broke the @ECMWF yesterday and surprised the @NOAA GFS today is not related to the actual weather itself.
For 8000 years from 12000 BC to 3000 BC this was normal & Europe didn’t drown. /2
The question posed by this relates to climate change.
The transit of moisture across the Sahara may be a rare event, or it may be the new normal with a stronger WMA. Time will tell. And the weather models will learn.
@anacascao It looks as if the West African Monsoon is having an unusually strong year. Historically much of the Sahara was forested until 5000 years ago.
It's possible monsoon like conditions are spreading north into the ME - where it also used to be less arid.
@anacascao Computer modelling based on physics also predict all this.
@anacascao For the #GERD the implications are massive. This year the white Nile is already having a massive year. The little rainy season has started in Ethiopia and forecasts consistently show good rainfall for 10-16 days ahead.
A series of images of a weekend burst of energy and water into the European weather system starting 8am on Saturday 17th.
2nd image: 3pm 17th - percussive impact as WMA water hits EU system over Aegean.
3rd image: 9.30am 18th - 5 separate weather systems. #EUClimateChange
The impact of an injection of rain bearing air from West Africa northwards on Europe weather is striking.
A low pressure system is forecast to develop over Western Russia. This displaces the ridge of high pressure which had briefly reversed the flow of cold arctic air south.
This happens almost immediately - and has an immediate catastrophic impact on anticipated European temperatures which are now set to plummet and stay low for a fortnight.