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Dr. Tim Coleman
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The first significant cold front of Fall 2016 moved through Alabama yesterday, cooling temperatures from highs in the upper 90s Saturday and Sunday to the upper 80s today. If you look at the chart above, a secondary front, or dry line, is moving through Alabama now, with another wind shift... Continue reading
Posted 2 days ago at WBRC Weather
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This summer has been a hot one. I don't think anyone would deny that. It has also been rather humid, making air conditioners work harder (their energy goes into cooling and removing moisture from the air and when the air is more humid, more energy has to go into removing... Continue reading
Posted Sep 16, 2016 at WBRC Weather
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After a week or more of watching the weak, disorganized tropical depression 9, it became a tropical storm last night and has now been upgraded to a hurricane. USAF hurricane hunters found surface winds of 65 knots (74 mph), so that makes it a hurricane. Given the warm water and... Continue reading
Posted Sep 1, 2016 at WBRC Weather
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Tropical depression nine, centered in the SE Gulf of Mexico, appears to be more organized this afternoon to me, as thunderstorms are starting to develop near to the weak center of circulation. USAF hurricane hunters found no winds of tropical storm force in their flight this morning, but it would... Continue reading
Posted Aug 29, 2016 at WBRC Weather
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The fairly weak tropical low in the Western Atlantic Ocean, near the Windward Islands, is currently being investigated by USAF hurricane hunter aircraft. They have found wind gusts of tropical storm force in the past two hours in some of the squalls of thunderstorms around the system, and they are... Continue reading
Posted Aug 24, 2016 at WBRC Weather
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A tropical disturbance is centered near Mobile Bay this afternoon. It will not develop into a tropical storm or anything like that, but it will continue to bring very moist air in from the Gulf of Mexico, so skies will be mostly cloudy until at least Saturday, with scattered, mainly... Continue reading
Posted Aug 10, 2016 at WBRC Weather
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On Sunday afternoon, I tweeted this picture of a vivid rainbow, that almost arched across the whole sky, from the Winn Dixie parking lot in Trussville. I said I would do a blog on rainbows this week. Here it is. They are predictable (I predicted this one inside Winn Dixie),... Continue reading
Posted Aug 9, 2016 at WBRC Weather
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With increased moisture over Alabama the rest of the week, we will see more scattered thunderstorms, especially during the heat of the day. The above radar picture shows at least 40 mainly small showers and thunderstorms over central Alabama. These are convective cells, much like the bubbles that rise in... Continue reading
Posted Jul 27, 2016 at WBRC Weather
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A large, deep ridge of high pressure is setting up over the central United States this week. The ridge to our west aloft, and at low levels, will combine to produce some of the hottest temperatures we have seen in Alabama in four years. The temperature reached 94 in BHM... Continue reading
Posted Jul 19, 2016 at WBRC Weather
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Check out the two radar pictures below of the storm near Grayson Valley in NE Jefferson County. The first, at 0.5 degrees elevation (2,000 feet above ground level), shows almost nothing (maybe no rain hitting ground yet), but the second one (at 6.0 degrees elevation angle, or 19,000 feet above... Continue reading
Posted Jun 12, 2016 at WBRC Weather
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As of 10 am this morning, the National Hurricane Center has identified the disturbance off the Yucatan Peninsula as a tropical depression, with sustained winds of 35 mph. It is about 550 miles south of Mobile, Alabama. There is enough wind shear over the Gulf that it should keep the... Continue reading
Posted Jun 5, 2016 at WBRC Weather
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Last Thursday night, a intense line of storms moved along the Gulf Coast, producing 70 mph winds in many places, including Fort Morgan, AL. The system was most intense in Louisiana. Off the coast of Louisiana, air pressure changes and wind changes in the storms were enough to cause a... Continue reading
Posted May 25, 2016 at WBRC Weather
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A large area of thunderstorms with high winds, perhaps a derecho, but certainly a bow echo (where the winds push the center of the storms out faster than the rest of the line) has been moving along the Gulf Coast and into southern Mississippi and Alabama since last night. The... Continue reading
Posted May 20, 2016 at WBRC Weather
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A line of strong thunderstorms is moving through Mississippi right now, and will move into west Alabama by 4 pm, and into the Birmingham area between 5 pm and 7 pm. These storms will produce very heavy rain, gusty winds up to 50 mph, and dangerous lightning. It will be... Continue reading
Posted Apr 29, 2016 at WBRC Weather
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An area of rain and thunderstorms continues to move through central Alabama this afternoon, but these storms are not severe and pose no threat for damaging winds or tornadoes around here. It does look like the rain will finally stop, for at least a while, over the Birmingham area by... Continue reading
Posted Mar 24, 2016 at WBRC Weather
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A decaying upper-level storm system will bring a cold front through Alabama tomorrow night. The main surface low pressure area will be located in the Midwest (Illinois, Indiana, etc.), but we will still have fairly significant wind shear here in Alabama. So, severe weather is possible tomorrow. As has been... Continue reading
Posted Mar 23, 2016 at WBRC Weather
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A line of thunderstorms, a little ahead of schedule, is moving into northwest Alabama. These storms will likely arrive in Birmingham by 300 or 400 pm. However, I have not seen any reports of wind damage with the storms, the air over Alabama is still rather stable, and with SW... Continue reading
Posted Mar 1, 2016 at WBRC Weather
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Above is a typical radar map of reflectivity, that shows how much radar return is coming back from raindrops or snowflakes. Notice how it is very cellular, like bubbles. This is because we have very cold air aloft, so even though it is in the 40s at the surface, the... Continue reading
Posted Feb 24, 2016 at WBRC Weather
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Go to myfoxtracker.com main website for a full review of the severe threat. There are some interesting weather events and possibilities tonight, too. 1. Wake low At the back edge of the rain area, from Walker County into Tuscaloosa county, there is an abrupt end to the rainfall. Radar cross... Continue reading
Posted Feb 23, 2016 at WBRC Weather
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The large storm system is moving NE. Luckily for us, a large area of heavy rain has developed over western Alabama that is rotating toward Birmingham. That rain will help keep the atmosphere fairly stable for at least the next 2 or 3 hours. We could even see some flash... Continue reading
Posted Feb 23, 2016 at WBRC Weather
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The low pressure area is wrapping up to our west, with severe storms near the Gulf Coast, and heavy rain moving into west Alabama. A tornado just touched down in Purvis, MS, just south of Hattiesburg, with a report of a fatality from NWS. A Particularly Dangerous Situation tornado watch... Continue reading
Posted Feb 23, 2016 at WBRC Weather
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SPC has placed south Alabama in a "moderfate risk" for severe storms, including tornadoes, for later this afternoon and tonight. Here in central Alabama, we are mainly in a "slight risk", with enhanced risk south of Birmingham. As a strong surface low moves out of Louisiana and across Mississippi this... Continue reading
Posted Feb 23, 2016 at WBRC Weather
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On Tuesday, we had snow showers in Alabama, with a band of heavy snow moving through Birmingham in the early afternoon. This snow was enhanced by the cloudy/clear line at the back edge of the wrap-around moisture, as shown by the enhanced clouds along that boundary in the satellite picture... Continue reading
Posted Feb 12, 2016 at WBRC Weather
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A band of snow has developed along the back edge of the moisture associated with the upper low. This band is convective, meaning it is being caused by the sharp temperature contrast between the cold temperatures under the cloud cover and the warmer temperatures in the sunshine, much like we... Continue reading
Posted Feb 9, 2016 at WBRC Weather
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The cold air is coming in today! Strong northwest winds are blowing. If we go NW from Birmingham, we see a temperature of 51 here, 47 in Tupelo, 45 in Memphis, and 34 in Springfield, MO. That air is headed our way. During the day tomorrow, with cloudy skies, we... Continue reading
Posted Feb 8, 2016 at WBRC Weather