Showers and thunderstorms overnight brought some moderate to isolated heavy falls southwest of Perth overnight. Some of those storms were gusty with winds reported to 80kmh with some thunderstorms.

Conditions have remained unstable overnight and through Tuesday morning. It is still warmer than normal as well, however the moisture profile is not especially high so thunderstorms are elevated and should remain so.

Satellite Imagery - Valid Tuesday May 18th 2021. Shows clusters of showers and thunderstorms, mainly elevated, north of Perth.

The thunderstorm coverage will extend further inland and along a trough that is moving through the SWLD this afternoon and evening. No severe weather is expected, but storms could be locally gusty and heavy.

Thunderstorm Forecast - Tuesday May 18th 2021.

Rainfall for the region remains confined to the SWLD with moderate to heavy falls develop as we finish the month and head into June. The negative SAM that is developing will see a procession of fronts for the SWLD from later this weekend and the following 2 weeks so a major shift away from the warm weather of late is on the horizon.

Rainfall forecast - Next 10 days - Weather Matters - Valid Tuesday May 18th 2021.

More details to come on the developing frontal barrage later this week as better data on the wave train becomes established and whether moisture from the north and west can get involved as there are some signs towards the end of the month that better moisture may be drawn in from the Indian Ocean.

Precipitable Water Values - Next 2 weeks. GFS 18z run valid Tuesday May 18th 2021.

Would you like more information for you, that is tailored to your farming or business needs? Email me at karllijnders@weathermatters.org for further details.

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