This is Dr. Tim Coleman's Typepad Profile.
Join Typepad and start following Dr. Tim Coleman's activity
Join Now!
Already a member? Sign In
Dr. Tim Coleman
Recent Activity
Image
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 6 days ago at WBRC Weather
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
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
Image
The above chart shows temperatures at 6 am CST this morning over North America. 30s here in Alabama, colder out in the Rocky Mountains. But look up north. A mass of very cold air has developed again over Canada, with a large area of temperatures below -20 F (the white... Continue reading
Posted Feb 4, 2016 at WBRC Weather
Image
Scattered showers and thunderstorms are developing over Mississippi and Alabama this afternoon in the warm, moist air mass. However, over Alabama, these storms are having a hard time becoming very large due to the warm air aloft we talked about yesterday. It is shown on the balloon data from Shelby... Continue reading
Posted Feb 2, 2016 at WBRC Weather
Image
The big swirl on satellite in the southwestern U.S. is a large storm system that will move across the United States over the next 2 days. The upper-level trough will cause a surface low pressure area to form and move through the central Plains and into the Great Lakes by... Continue reading
Posted Feb 1, 2016 at WBRC Weather
Image
A small area of rain, perhaps mixed with a little sleet and snow, will rotate through the Birmingham Metro area over the next hour. Temperatures are still above freezing (41 and dropping), and there should be no widespread travel problems with this area of precipitation, except perhaps at high elevations... Continue reading
Posted Jan 22, 2016 at WBRC Weather
Image
The heavy rain is moving out of central Alabama this morning. We now turn our attention to the western side of this large weather system, where a deformation zone (area where air gets stretched) has developed and, along with moisture wrapping around the system, is producing heavy snow in Arkansas,... Continue reading
Posted Jan 22, 2016 at WBRC Weather
Image
We are in a cold, active weather pattern. And, unfortunately, a closed upper-level low (the circle that forms in the 500 mb flow on Friday) will be involved, making the forecast difficult. We often say, "Upper level low, weatherman's woe." Temperatures will slowly warm up through tomorrow with occasional light... Continue reading
Posted Jan 20, 2016 at WBRC Weather
Image
It's been a cold week here in Alabama, with low temperatures Monday morning dropping into the teens over north Alabama, including 19 in Birmingham, with freezing temperatures all the way to the Gulf Coast. It has stayed cold this week, but temperatures will briefly moderate this afternoon into tomorrow and... Continue reading
Posted Jan 14, 2016 at WBRC Weather
Image
Above is a map with current weather across the central U.S., including temperatures (in red). Note it is 55 here in BHM, and even 52 in Paducah, KY. But then you cross the cold front. It is 34 in St Louis, 8 in Des Moines, Iowa, and below zero in... Continue reading
Posted Jan 9, 2016 at WBRC Weather