Data compiled by Vagarian Abhijit and Map made by Vagarian Tejas
The confusing "Vayu" continued its variable track due to the secondary Low Level convergence Zone. The Low level Divergence was present in the radius of about 400 kms from the centre. But the secondary low level convergence occurred at 1000 kms from the centre.
When the cyclone started moving West, the Secondary Low level convergence occurred over the West coast (Maharashtra Region), causing "outer band " rains.
The diabatic heating associated with the cyclone triggers a Rossby wave, with a ridge on the Peninsula in the lower and middle troposphere.
This will create a trough in the Bay head and activate the SWM in the Bay and west coast, pulling it North. Will create the required gradient also.
When Westerly winds approach the west coast, thry are de celareted due to western ghats. A zone of convergence is created off the coast.
Now, South of Goa, the winds are SW, But along the Maharsatra coast, the winds are Southerly, hence dynamics of off shore trough formation is absent.
An off shore trough today prevails from Goa to Kerala. With the re-curving of Vayu, a proper gradient will be created to help the SWM along the remaining west coast. If no recurving, then Bay activity should help Monsoon progress.
(As discussed with IMD scientists)
Hence Monsoon Limit stationary today at Northern limit of Goa and thence thru coastal Karnatak and TN.
Vayu is currently located at 20.8N and 67.4E, having moved slightly West.
Heavy rains likely to decrease in Saurashtra and Kutch for the next 2 days.
Yesterday also S Saurashtra lashed by heavy rain due to outer bands of cyclone Vayu
Sutrapada (Gir Somnath) 120
Talala (Gir Somnath) 100
Veraval(Gir Somnath) 90
Kodinar (Gir Somnath) 80
Kutiana (Porbandar) 60
Malia (Junagadh) 6
Mumbai weekend given below
in yesterday's post.