It’s always a long shot at our latitude, but NOAA’s Space Weather Prediction Center says it’s possible that the northern lights will enchant the skies over half the country, including the Philadelphia region, on Sunday night.

The threat of severe weather looms large Friday night, as a system expected to bring drenching rain could also bring some tornadic activity.

NOAA predicts an above-normal Atlantic hurricane season, urging Philadelphia to prepare for potential impacts.

Rain, which forced the Phillies to postpone their game Wednesday night against the Atlanta Braves, has been observed on 18 days so far, with a good chance that number will increase to 20 by the weekend. (This has nothing to do with Tropical Storm Alvin, by the way; that’s in the Pacific.)

PHILADELPHIA (WPVI) -- Friday night's activity will be north of us by Saturday morning, and we should see a few breaks of sun before another round of scattered storms move in for Saturday afternoon.

Sunny Memorial Day at 74°F, mild night at 54°F, with a week ahead of variable clouds, rain, and highs in the mid-70s.

SUNDAY: Mostly sunny and seasonably cool. High: 68, Low: 46

On Friday at 5:04 p.m. a tornado watch was issued by the National Weather Service in effect until Saturday at midnight for Bucks, Chester, Delaware, Montgomery and Philadelphia counties.

In an often soggy final two weeks of May the highest temperature was 79 degrees in a period where it’s not uncommon, at least in the 21st century, for a couple of 90-degree days.

The weather conditions will be relatively kind Tuesday after a gorgeous Memorial Day in the Philadelphia area.