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Dr. Tim Coleman
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All is quiet across central Alabama right now, with the air fairly worked over by storms that came through earlier. Dewpoints are near 60 degrees, and temperatures have cooled into the 60s with clear skies. A surface inversion has formed, allowing the radar beam to bend and pick up lots... Continue reading
Posted 5 days ago at WBRC Weather
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Big storms moved through parts of north Alabama earlier. The Birmingham airport had 0.74" of rain, most of it in about 30 minutes, and a wind gust of 51 mph. The air has stabilized over north and central Alabama for now, with drier air moving in and storms cooling it... Continue reading
Posted 5 days ago at WBRC Weather
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The weather situation is complex over the southeastern U.S. today, and it's time to start moving away from computer models and looking out the window. The surface map above shows a dry line, or a front that causes a wind shift and brings in drier air, moving through eastern Mississippi... Continue reading
Posted 5 days ago at WBRC Weather
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A storm system will move through the southern U.S. tomorrow and tomorrow night. It is that time of year when tornadoes are most likely in general, so we have to keep an eye on these systems. A low pressure area will be centered near the Great Lakes tomorrow evening, with... Continue reading
Posted 6 days ago at WBRC Weather
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Many of you may have watched the Master's golf tournament this weekend, on arguably one of the most beautiful golf courses in the world, Augusta National, at its peak in April with dogwoods and azaleas blooming. But, you can hardly beat some of the wild scenery here in Alabama. I... Continue reading
Posted 7 days ago at WBRC Weather
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A strong cold front is moving through the Midwest this afternoon, and the weaker end of it will move through Alabama tomorrow. It is getting late enough in the year where the coldest air often doesn't go this far south. But, the tail end of the front and its dynamics... Continue reading
Posted Apr 9, 2015 at WBRC Weather
JP has talked on TV about his passion for flying. He has been taking pilot lessons for several years...I say "has been" because he has already gotten IFR (instrument flight rules) certification (so he can fly a plane even if there is fog and low clouds), and he is working... Continue reading
Posted Apr 6, 2015 at WBRC Weather
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Most of the strong thunder died off before it got to Birmingham and Tuscaloosa, but there are still a lot of non-severe storms over central Alabama, from Demopolis and Marion to Shelby County. There is another line of heavy rain near the cold front over Jefferson County and east to... Continue reading
Posted Apr 3, 2015 at WBRC Weather
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The cold front has already moved through parts of western Tennessee, and is headed our way. A line of thunderstorms has developed ahead of the cold front. There have been numerous reports of wind damage and some hail with the line of storms in Tennessee. One gust to 68 mph... Continue reading
Posted Apr 3, 2015 at WBRC Weather
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You hear us talk about wind shear and helicity, and its effect on storms and their rotation quite a bit. This is a quick blog to explain what these are and how they operate. 1. Wind shear Wind shear is simply a change in wind speed or direction with height.... Continue reading
Posted Apr 3, 2015 at WBRC Weather
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The Storm Prediction Center has placed most of north and central Alabama in a slight to enhanced risk for severe weather for late this afternoon and tonight. "Enhanced" is a new category this year between "slight risk" and "moderate risk". A strong cold front is approaching from the northwest with... Continue reading
Posted Apr 3, 2015 at WBRC Weather
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A few showers and thunderstorms have popped up again over Alabama today, and are producing locally heavy rain and lightning as they move northeast. The air is not as cold aloft today as it was Tuesday, but there still could be a few spots that get small hail. Lightning is... Continue reading
Posted Apr 2, 2015 at WBRC Weather
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Numerous severe thunderstorms are scattered across north and central Alabama. There is some cold air aloft, and that, along with temperatures in the 70s, has caused the air to become unstable enough for several severe thunderstorms. With the cold air aloft, the main issue has been hail. There have been... Continue reading
Posted Mar 31, 2015 at WBRC Weather
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With a weak upper-level disturbance moving through this afternoon, and fairly unstable air (CAPE near 2,000 J/kg due to upper level cold temperatures and fairly warm temperatures at the surface), a few strong storms have developed over central Alabama this afternoon, and may continue to do so through the afternoon.... Continue reading
Posted Mar 31, 2015 at WBRC Weather
A strong cold front dropped temoeratures from the 70s at 7 pm last night to the 40s by 1130 pm. The cold air will get deeper through Saturday, with highs today in the 50s and tomorrow it will stay in the 40s most of the day. Lows will drop below... Continue reading
Posted Mar 27, 2015 at WBRC Weather
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What a nice day today! Temperatures in the upper 70s and lower 80s with partly cloudy skies. It looks like summer. The sun is getting stronger too. Here is the chart from the UAH pyranometer the past two days. The dips are when clouds go by, but notice around 1730... Continue reading
Posted Mar 25, 2015 at WBRC Weather
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The above chart shows the amount of solar energy coming in each day, in kilowatt hours per square meter, at the top of the troposphere throughout the year (so it assumes clear skies). It's pretty accuare at the ground when it is sunny, but with clouds the actual values can... Continue reading
Posted Mar 20, 2015 at WBRC Weather
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The spring equinox occurs today at 2245 GMT (5:45 pm CDT). So today the entire world gets 12 hours of day and 12 hours of night. It's nice to see spring this year after the long cold. Due to the rotation of the earth around the sun, the sun has... Continue reading
Posted Mar 20, 2015 at WBRC Weather
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The above photograph is a still shot from a camera (I think in England) from 0934 GMT (4:34 am CDT) this morning. A total solar eclipse occurred at a few points for a few minutes, but the moon was in front of at least 50% of the sun over a... Continue reading
Posted Mar 20, 2015 at WBRC Weather
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Above is the temperature plot from the Birmingham airport from 2 pm last Wednesday through 2 pm last Thursday. A really strong cold front moved through overnight, dropping temperatures from the upper 70s Wednesday afternoon, into the 30s by 10 am Thursday. Then, moisture came in Thursday and brought freezing... Continue reading
Posted Mar 13, 2015 at WBRC Weather
It's not like you need me to tell you, but we had a very cold February. A very cold pattern set up in the middle of February, with three straight weeks of cold air starting around Tuesday the 10th. Our average high temperature in Birmingham was 50.2, the 7th coldest... Continue reading
Posted Mar 13, 2015 at WBRC Weather
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It suddenly got cooler today! But, it's only temporary, and it's still in the 50s (not the 20s like last week). Air normally flows clockwise around a high pressure area, but today the high pressure area is centered over the northeast U.S., and the air can't quite make it over... Continue reading
Posted Mar 13, 2015 at WBRC Weather
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The last area of heavier precipitation is moving over the Tuscaloosa and Birmingham metro areas right now. It is mainly falling as sleet, with some freezing rain and a few snowflakes. With the cold north winds and initial melting of sleet, temperatures have dropped below freezing in much of Jefferson... Continue reading
Posted Mar 5, 2015 at WBRC Weather
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The cold front moved through Birmingham around 8:30 pm. The temperature has already dropped from the high temperature, 79 degrees, to 53 at 10 pm, and it will continue to drop quickly. It's already down to 41 in Huntsville and 31 in Nashville. We're having a few showers along and... Continue reading
Posted Mar 4, 2015 at WBRC Weather
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The National Weather Service has issued a Winter Storm Warning for tomorrow for the pink area, as far south as Lamar, Fayette, and Walker counties. South of there, a freezing rain advisory is in effect for Tuscaloosa, Jefferson, and Shelby counties and others. Very cold air, currently over Misouri, Illinois,... Continue reading
Posted Mar 4, 2015 at WBRC Weather