With the destructive tornadoes in Kathleen, Florida, and elsewhere over the weekend, here is an ebook about the essential nature of tornado warning systems . You can easily read it in one evening. Here are some recent ratings . The book contains excellent safety advice for home, work and school. I will be among the best $2.99 you'll ever spend.

1:42am, the tornado threat (purple polygons on this map) is, as expected, now concentrated in southwest Missouri.  The yellow counties are still under tornado watches. In Arkansas, those last until 7am. This is the last update as I am retiring for the night.

The yellow-tinted counties are currently under tornado watches. Between midnight and 2a Monday, I'm especially worried about the area I've outlined in yellow which encompasses much of the Ozarks. Wind gusts to 80-90 mph and brief tornadoes are likely. Below are safety suggestions you should implement immediately.  Because of the higher than average overnight tornado risk, I strongly recommend downloading  the  AccuWeather app   . Be sure to "allow" location services.  Making sure you have turned the  emergency notification feature  (ENF) your smartphone. Easy instructions below. For all of its many imperfections, it is ideal for this use.  If you are in the threat area, put your (fully charged) smartphone with the AW App and the ENF turned on next to your bed. Turn on your weather radio.  Insure your PC and phone are fully charged but take them off the charger before lightning arrives. Put any family heirlooms (scrapbooks, etc.) i...

This watch is in effect until 5am. Scroll down for instructions to make your iPhone an overnight #tornado alarm." Note: A tornado went across north Dallas this evening causing injuries and considerable damage. The path is below. Click to enlarge.  Sunday Night Football was in progress in Arlington while the tornado was cutting through north Dallas. Because of the progress we have made in tornado science, there was no need to stop the game.  That's all for tonight. 

Here is an overview of the warnings in effect as of 8:44pm. On this map, purple = tornado warning and red = severe thunderstorm warning. So far, this weather situation is evolving about as expected with the higher probability of tornadoes from about 9pm to 3am in the areas outlined by tornado watches (below). This will be the last blog update for the evening. For more, please follow me on Twitter @usweatherexpert .

This tornado watch is in effect until 3am. Strong tornadoes and 80 mph winds are forecast by the NWS.

Updated NWS Tornado Forecast to 7am  Also, Strong Tornadoes Forecast to Occur From Now Until 3am  The NWS's significant tornado risk is the brown area from near Ft. Worth to near the Mississippi River in Missouri and Arkansas. The yellow area is an enhanced risk of tornadoes and, in the hatched area,  strong tornadoes are forecast to occur. It is time to begin monitoring the weather throughout this area.  "What Should I Do Now?" Below are safety suggestions you should implement immediately.  Because of the higher than average overnight tornado risk, I strongly recommend downloading  the  AccuWeather app   . Be sure to "allow" location services.  Making sure you have turned the  emergency notification feature  (ENF) your smartphone. Easy instructions below. For all of its many imperfections, it is ideal for this use.  If you are in the threat area, put your (fully charged) smartphone with the AW App and t...