Equinoctial threat

At 10:49 a.m. tomorrow spring arrives -- in Buenos Aires and Sydney, Australia.

Up this way the equinox means the end of the astronomical summer and the beginning of fall, and it should begin promisingly enough.

The weather during most of the day should be splendid, with the sun breaking through mid-morning and temperatures heading into the low 80s.

But a cold front is due later on, and that's likely to set off some showers and thunderstorms tomorrow night.

The Storm Prediction Center has placed the region under a "slight risk" of severe weather, meaning winds of 58 m.p.h. and/or large hail.

The afternoon discussion by the Mount Holly National Weather Service, however, suggests the threat is remote.

Widespread severe weather is unlikely, forecaster Walter Drag writes, and the dynamics aren't all that impressive-looking.

Another factor arguing against severe weather is the fact that this would be a nighttime threat, well after the storm-fueling sun has retired on the first day of fall.