A stubborn area of upper level low pressure slowly pinwheels through the metro region over the next 24 hours bringing showers and pretty constant cloud cover. We probably have to wait until Thursday to see the return of solid sunshine.
Through Tonight: Scattered, intermittent showers are likely and a thunderstorm can’t be ruled out. The best chance (30-40 percent) of any severe weather is southeast of town toward the Bay, but a strong storm capable of a little hail or a strong gust of wind can’t be ruled out in the metro region. After midnight, shower activity begins to thin out, with just some patchy light rain and drizzle lingering. Overnight lows are around 50, with a clammy wind from the east at 10 mph or so.
Tomorrow (Wednesday): We could see some widely scattered showers in the morning; otherwise, it’s mostly cloudy and cool. If we’re lucky, skies brighten and we get some late day sunshine. Highs only manage near 60. Winds become from the north at 10-15 mph.
Arctic ozone depletion: The American Meteorological Society’s blog, the Front Page, reports the layer of stratospheric ozone over the Arctic has declined 40 percent from the beginninng of winter to late March - an “unprecedented reduction.” The extent of the depletion is a result of ozone depleting chemicals in the atmosphere coupled with unusually cold stratospheric temperatures. Although ozone depleting chemicals have largely been phased out through the Montreal Protocol, many of them have very long atmospheric life times.