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26 Apr, 4 tweets, 5 min read
26 April #NileBasin Satellite rain update thread.

This morning....
This morning's cloud presentation of rain clouds over the #NileBasin watershed area in Ethiopia was busier than usual. The trend is continuing this afternoon with expanding thunderstorm activity over #Yemen #Somaliland, #Djibouti and #SouthSudan
Radar Imagery of active rain storms in the #NileBasin and #HornOfAfrica as at 4.50pm today.
Two weather radar closeups of intense storm activity over:
1/ #Yemen & East #Somaliland
&
2 / The Blue & White #NileBasin areas in Eastern #Ethiopia #Sudan #SouthSudan and #Uganda

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More from @althecat

Alastair Thompson Profile picture
27 Apr
A major West African Monsoon (WMA) Sahara water transit event has just started. [See animation below).

This thread contains 10 day ECMWF, CMC & ACCESS-G model forecasts of its trajectory & impact on Europe.

The quoted thread addresses #ClimateChange implications.
Here you see the beginning of this event. It is much larger than earlier iterations of the same phenomena. These streams of air-born water are roughly 4000 kms long.
This tweet and the next three contain 10-day forecasts of the trajectory of this hydrological atmospheric phenomena. They forecast precipitable water, the quantity of water which is held in the atmosphere measured in inches.

The first one is from the Euro ECMWF model.
Read 19 tweets
Alastair Thompson Profile picture
27 Apr
An image of thunderstorm activity in the Ethiopian #Abbay #BlueNile basin this afternoon, also showing significant rains South #Yemen and over most of #Somalia.

Todays, 27th April, accumulated rain forecasts for the #MiddleEast & #HornOfAfrica follow in the thread below. Image
#ArabianStorms activity was boosted today by moisture flowing from the #Ethiopian monsoon rains in the Ethiopian Highlands, the watershed of the #Abbay #BlueNile catchment.

Below you see a 10-day GFS forecast of accumulated rain over North Africa. Image
This animation shows the flows of moisture from this morning across the Red Sea. A process which is called the "Southern Gate" by Saudi weather entusiasts. #ArabianStorms #Abbay #BlueNile #GERD
Read 13 tweets
Alastair Thompson Profile picture
27 Apr
Two views of the intense rain activity across the Middle East and East Africa today from Iran to Uganda. ImageImage
See also an earlier thread here about rain reaching Mecca.
And another thread from this morning, as the first storm sparked up over the Yemen/Saudi border.
Read 4 tweets
Alastair Thompson Profile picture
27 Apr
Today is shaping up to be a huge day for thunderstorms across the Arabian Peninsula, #NileBasin and Horn of Africa.

#KSA #SaudiArabia #Yemen #Oman #Iraq #Kuwait

#Ethiopia #Sudan #Eritrea #Somalia #SouthSudan #Uganda

#ArabianStorms #DesertRain Image
Live weather radar of #ArabianStorms across The Arabian Peninsula. /2 Image
Inside the Grand Mosque in Makkah Muslim pilgrims and the @HolyKaaba. /3 ImageImageImageImage
Read 8 tweets
Alastair Thompson Profile picture
27 Apr
Presumably this is this storm that is just getting underway on the Yemen/Saudi Border. @Arab_Storms
Forecast weather parameters as at 7am [From @NOAA GFS computer model latest run] :
- High levels of précipitable airborn water, needed for storm
- High levels of CAPE (energy per kg of water) = unstable air = thunderstorm potential ImageImage
The other factor is the rapidly rising temperature (animation here runs from midnight Monday to midnight Tuesday. The temperature peaks in the early - which is when we tend to see thunderstorm development rapidly accelerate.
Read 5 tweets
Alastair Thompson Profile picture
26 Apr
26th April #NileBasin #MiddleEast accumulated rainfall forecast update. Today has seen a significant increase in thunderstorm activity from Uganda all the way north to Iran.

#ArabianStorms #GERD #Ethiopia #Egypt #Sudan #HornOfAfrica #KSA #Yemen

[Image: @NASA Worldview.]
26th April 10 Day GFS model accumulated rain forecast across the ME and Africa. /2
26th April animation thread of clouds over the rainy part of the Nile Basin. The Clouds over Sudan, South Sudan and Western Ethiopia all contribute to the flow in the Nile River. /3
Read 13 tweets

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