Keep eyes on two tropical systems: Karen and Lorenzo

There are two tropical systems that we have to watch in the coming week or two.

Tropical Storm Karen just passed over Puerto Rico and is moving toward the North but some of the models turn it back to the west by the weekend, and  it is way too early to say if it will be a threat to the U.S.

We also have Lorenzo in the Far Eastern Atlantic and likely to become a major hurricane, but once again the big question is will it curve to the north before threatening the U.S.? Stay aware in the coming weeks because this is a busy time in the tropics.

On the local scene in Osceola County, we are looking sunny through Friday with highs around 92 and lows near 70.  The chance of showers will begin to increase from the weekend and into early next week with chances ranging from about 30 to 50 percent. Next week you can expect it to be very breezy every day due to these tropical systems off the coast, winds will mostly be from the East to Northeast.

Did you know that heat lightning is actually lightning from a thunderstorm somewhere? Back before radar was invented, folks would be sitting out in the evening on a hot night and they would see lightning flashing in the sky, and they would think, “Well there’s no clouds so I guess it is heat lightning.”

 When you see this, there is a thunderstorm somewhere. Lightning can be seen from a storm 100 miles away on a clear night. The old wives’ tale that a hot, humid night can generate lightning without a thunderstorm  is exactly that – a meteorological myth. Heat lightning is just normal lightning from a thunderstorm too far away for the sounds of thunder to be transmitted. Our evening sky continues to feature Jupiter to the south-southwest. Autumn has arrived and the sun is getting lower in the sky. Sunrise on Friday will be 7:16 a.m. with sunset at 7:18 p.m. If you have a weather question or need weather data, email me at

Steve Norris is a National Weather Association certified meteorologist, who works for newspapers, radio stations and provides severe weather information to city governments.