It’s shaping up to be an interesting afternoon weather-wise. I took a look at the Franktown radar a few minutes ago and saw a large purple blog making its way towards Ottawa. The snapshot to the right is the most recent radar image (as of about 12:55) and the purple blob has spread out a bit and become a red and yellow blog that covers a slightly larger area. The track of the incoming weather suggests that the strongest part of the storm is going to pass just to the south of Ottawa, but that could change, of course, or the rain north of the blob could pick up some energy and develop into more exciting weather.

Looking at the weather trends for the last 24 hours, you can see the pressure had dropped since noon yesterday:

The aviation forecast suggests that we’ll see thunderstorms, possible including hail, from 3pm:

TAF AMD CYOW 231635Z 2316/2412 21010KT P6SM SCT060
FM231900 21015G25KT P6SM -TSRA BKN050CB TEMPO 2319/2320 VRB25G50KT 1/2SM +TSRAGR OVC040CB
FM232000 21015G25KT P6SM BKN050 TEMPO 2322/2401 VRB15G30KT 2SM TSRA OVC040CB
PROB30 2323/2401 VRB25G50KT 1/2SM +TSRAGR OVC040CB
FM240100 24010KT P6SM BKN040 TEMPO 2401/2408 6SM -SHRA BR BKN020
BECMG 2402/2404 28008KT
RMK NXT FCST BY 231800Z=

Fun stuff, eh?