Effective as of 12:00 AM Friday September 25 2020
Explanatory notes:Some middle level cloud and elevated convection ahead of an upper level trough with cold air aloft, warm air in the lower levels, mainly virga at the moment with plenty of dry air below the 650 hPa level.
Gusts to 90 km/h possible over the hills and foothills early today should strong winds aloft mix down with ECMWF model showing winds up to 90 km/h at the 950 hPa level under a weak inversion.Precipitation/virga can also push these strong winds down. Easterlies of this intensity are rare for this time of the year.
The Australian Bureau of Meteorology (BOM) has issued a severe weather warning for damaging winds including the Perth Hills and foothills valid on Thursday night and early on Friday, view the latest warning at http://www.bom.gov.au/
Showers possible on Friday with the low to the southwest and moist air making its way in the lower levels, also possible thunderstorms, most likely during the early hours with the cold air still aloft.
On Saturday, showers and also possible thunderstorms ahead of an upper level disturbance.
Showers possible for the rest of the forecast period from Sunday with a moist westerly flow.
Friday September 25:
City:
14-23 Degrees Celsius
Shower or two.Possible thunderstorm.
Chance of any rain:50%
Amount:0 to 2 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A medium(50%) chance of showers.The chance of a thunderstorm.Winds east-northeasterly at 25-40 km/h easing to 15-25 km/h in the morning shifting northwesterly around the middle of the day.Gusts up to 90 km/h possible over the hills and foothills early.
Note:The Australian Bureau of Meteorology (BOM) has issued a severe weather warning for damaging winds including the Perth Hills and foothills valid on Thursday night and early on Friday, view the latest warning at http://www.bom.gov.au/
Saturday September 26:
City:
12-21 Degrees Celsius
Showers.Possible thunderstorm.
Chance of any rain:90%
Amount:2 to 6 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A very high(90%) chance of showers.The chance of a thunderstorm most likely during the afternoon.Light winds tending west-northwesterly at 15-25 km/h during the day.
Sunday September 27:
City:
11-21 Degrees Celsius
Shower or two.
Chance of any rain:60%
Amount:0 to 1 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A medium(60%) chance of showers.Light winds tending west-northwesterly at 15-25 km/h during the day.
Monday September 28:
City:
11-20 Degrees Celsius
Showers.
Chance of any rain:80%
Amount:2 to 6 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A high(80%) chance of showers.Light wids becoming west-southwesterly at 15-25 km/h later durign the day.
Tuesday September 29:
City:
11-20 Degrees Celsius
Shower or two.
Chance of any rain:60%
Amount:0 to 1 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A medium(60%) chance of showers.Light winds tending westerly at 10-20 km/h during the day.
Wednesday September 30:
City:
13-21 Degrees Celsius
Possible shower or two.
Chance of any rain:40%
Amount:0 to 1 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A medium(40%) chance of showers.Light winds tending westerly at 15-25 km/h during the day.
Thursday October 1:
City:
12-21 Degrees Celsius
Possible shower.
Chance of any rain:30%
Amount:0 to 1 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A slight(30%) chance of showers.Winds west-southwesterly at 10-20 km/h.
Charts:
Figure 1.Surface synoptic chart at 12 UTC(8 PM local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).
2.
FigureThe Australian Bureau of Meteorology (BOM) has issued a severe weather warning for damaging winds including the Perth Hills and foothills valid on Thursday night and early on Friday, view the latest warning at http://www.bom.gov.au/
Figure 2.Key features identified on True Colour RGB satellite image at around 06:00 UTC(2 PM local time yesterday).Satellite image courtesy of the Japanese Meteorological Agency(JMA).
local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).
Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).
