James Spann: Severe storms threaten Alabama through tonight
RADAR CHECK: Strong to severe storms continue to develop over the Tennessee Valley of north Alabama this afternoon, producing hail and strong winds in spots. A tornado warning is also in effect for parts of Washington County in southwest Alabama at mid-afternoon.
Coverage of showers and storms will increase over the next few hours statewide. The Storm Prediction Center has pushed the moderate risk (level 4 of 5) into northwest Alabama, including parts of Franklin, Colbert, Marion, Winston, Lamar, Fayette and Pickens counties. An enhanced risk (level 3) extends over to Huntsville, Gardendale and Tuscaloosa. A slight risk (level 2) covers most of the rest of the state.Here are some notes concerning tonight’s threat:
- The higher tornado threat is over the moderate and enhanced risk areas of west and northwest Alabama, but a tornado can’t be ruled out in other parts of the state tonight. The tornado threat will begin to ramp up after 8 p.m. when surface-based instability surges northward. The main concern before 8 p.m. comes from hail and strong straight-line winds, but an isolated tornado can’t be ruled out before 8.
- Strong and favorably veered wind profiles will support several long-lived supercells tonight in the moderate and enhanced risk areas (central Mississippi into northwest Alabama). A few long-track, strong tornadoes will be possible tonight as supercells mature and move northeastward.
- Rain amounts will average 1-2 inches, with locally heavier amounts. A flash flood warning has been issued for parts of Franklin, Colbert and Lauderdale counties in northwest Alabama.
- Be sure you have a reliable way of hearing warnings tonight if they are needed — never an outdoor siren. A NOAA Weather Radio is the baseline; have emergency alerts enabled on your phone. Have the ABC 33/40 weather app installed.
- In your safe place, have helmets for everyone.
- If you live in a mobile home, know the location of the nearest shelter, or a business that is open 24/7 and available as a shelter. Have transportation available.
- Follow the ABC 33/40 Facebook page so you can watch our coverage live on your phone. YouTube works as well.
- Don’t worry about severe weather risk levels or numbers; just be ready for severe storms tonight.
- Please don’t be anxious about tonight‘s weather; severe weather threats like this are common in Alabama between now and May. Get the warning, have a plan and we will get through the night together just fine.
Look for a breezy and much cooler day Wednesday with temperatures falling through the 50s. The sky will gradually clear. We drop into the 27- to 32-degree range across north and central Alabama by early Thursday morning. The weather will be dry Thursday and Friday with a good supply of sunshine both days; the high will be in the 50s Thursday, followed by 60s Friday.
THE WEEKEND: Showers are possible Saturday as a surface front pushes into the state. There will be no risk of severe storms and probably very little thunder — not a washout at all, but be ready for some rain at times if you have an event outdoors. The high Saturday will be between 65 and 70 degrees. Sunday’s forecast is a low-confidence one due to model inconsistency, but the latest guidance suggests the front will stall out, meaning some risk of rain will continue through Sunday.
NEXT WEEK: We will mention a chance of showers Tuesday night and Wednesday with a cold front passing through, followed by cooler, drier air over the latter half of the week. Temperatures will reach the low 70s Monday and Tuesday, followed by low 60s Wednesday, and 50s Thursday and Friday.
ON THIS DATE IN 1991: A tornado struck southeast Springfield, Missouri, causing F4 damage. Shortly after touchdown, the tornado reached F3 intensity approximately 3 miles north of the town of Nixa. While crossing a highway, the tornado picked up a truck and dropped it onto a frontage road, killing one passenger and injuring 10 others. The tornado intensified to F4 strength as it moved through the Woodbridge and Natural Bridge Estates subdivisions, where 15 homes were destroyed. Altogether, two people were killed and 64 others were injured.
ON THIS DATE IN 2016: Eleven tornadoes touched down across Alabama. One EF2 moved just under 10 miles from near Arley to Helicon in Winston County and ended 2 miles over the Cullman County line. The National Weather Service survey determined the estimated maximum winds were near 130 mph.
BEACH FORECAST:Â Click here to see the AlabamaWx Beach Forecast Center page.
For more weather news and information from James Spann and his team, visit AlabamaWx.