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
Today may be the hottest day so far this summer in central Alabama. It is currently 98 degrees in Birmingham, and that equals our highest temperature that happened in July. The air and the ground is dry, and there are very few thunderstorms on radar to cool things off. Notice... Continue reading
Posted yesterday at WBRC Weather
Image
A cool front moved through Alabama last night, bringing a slightly cooler and much drier air mass into Alabama. Our air is coming from Wisconsin and Minnesota, and that will remain the case going into the weekend. Notice how blue the sky is today! Temperatures (the red numbers) at noon... Continue reading
Posted 5 days ago at WBRC Weather
Image
A cool front is moving through Alabama this morning, bringing slightly cooler and much drier air with it. Temperatures are in the 70s, but the big change is the dewpoint, which is down in the lower 60s and will stay there for at least a day or two. That will... Continue reading
Posted 6 days ago at WBRC Weather
Image
The storms have formed into a line from Tuscaloosa to Calera, and they are slowly moving southeast. A severe thunderstorm warning is in effect for parts of the line in Shelby, Bibb, and Chilton counties. This line will produce beneificial heavy rain, but also dangerous lightning and possibly winds over... Continue reading
Posted Jul 22, 2015 at WBRC Weather
Image
Temperatures are now warming into the 90s, and with high dewpoints and enough cold air aloft, the air is becoming very unstable, with CAPE values above 2,500 J/kg, and no significant cap. There is a weak boundary over north Alabama, and south of that boundary air is more humid. Isolated... Continue reading
Posted Jul 22, 2015 at WBRC Weather
Image
I blogged recently about how thunderstorms cool things off at the surface (obviously through rain and cool downdrafts). They also warm things up at high levels, as all the condensation that occurs aloft as the updraft forms cloud water and ice releases heat. This is only a computer model here,... Continue reading
Posted Jul 20, 2015 at WBRC Weather
Image
If one looks at the radar from Birmingham NWS tonight, there are odd looking patches of radar reflectivity, that look like clouds or rain, to the NNW of the radar site and to the SE of the radar site. This is not rain, but instead AP, or anomalous propagation. The... Continue reading
Posted Jul 18, 2015 at WBRC Weather
Image
Temperatures have finally started to really heat up here in the late afternoon, but for most of the day it has been about 3 degrees cooler than at the same time yesterday. There are three reasons for that. 1. There was a little more cloud cover today. 2. The rain... Continue reading
Posted Jul 15, 2015 at WBRC Weather
Image
The line of storms is moving through the Birmingham metro area now. I had wind gusts above 40 mph here in Trussville. Trees and power lines are down all over north Alabama, including some on houses. There will almost definitely be power outages in the Birmingham area. Radar indicates winds... Continue reading
Posted Jul 14, 2015 at WBRC Weather
Image
The line of severe storms has started moving faster since 5 pm, possibly due to the fact that temperatures at the surface have cooled a little and the line is taking on a little bit of wave characteristic. A lot of things change in the atmosphere as the sun goes... Continue reading
Posted Jul 14, 2015 at WBRC Weather
Image
The line of severe storms that has been moving through Tennessee this afternoon is about to cross into north Alabama in the next hour or so. This line has caused high winds over much of Tennessee, with a 65 mph wind gust recently near Memphis, and trees down all over... Continue reading
Posted Jul 14, 2015 at WBRC Weather
Image
A strong thunderstorm, that is producing extremely heavy rain and intense lightning, has formed over downtown Birmingham this afternoon. It likely is related, at least partly, to the "urban heat island." The air gets hotter over the concrete of the city, making it more unstable than in rural areas. It... Continue reading
Posted Jul 10, 2015 at WBRC Weather
Image
After a cool start to the day for Summer, with low temperatures including lower 60s across the Birmingham metro area, 59 in Anniston, 65 in Tuscaloosa, and 55 in Fort Payne, southwest winds brought warmer and a little more humid air into the state this afternoon. It was still pleasant,... Continue reading
Posted Jun 29, 2015 at WBRC Weather
Image
What a nice night! As of 141 am, temperatures are in the 60s almost everywhere over north and central Alabama. In the Birmingham metro, it is a little warmer due to the urban heat island, but still in the upper 60s. it is 63 in Morris, 62 in heflin, and... Continue reading
Posted Jun 28, 2015 at WBRC Weather
It is 3:19 pm, and the Birmingham airport has 85 degrees! On Thursday at this time it was 93. Some cooler air has moved in with a weak cold front from the north. That front is now from near Heflin to Columbiana. There are a few storms along the front,... Continue reading
Posted Jun 27, 2015 at WBRC Weather
Image
I am working from the river today and decided to swim. The water temperature at the surface was 93 degrees! That's about as warm as I've ever seen it. It's the combination of 1) the strongest sun of the year, 2) sunny days, 3) hot temperatures, and 4) a lack... Continue reading
Posted Jun 23, 2015 at WBRC Weather
Image
As of 2 pm, it is 95 degrees at the BHM airport. It was 92 at this time yesterday. We can expect high temperatures at many locations in central Alabama in the upper 90s today, the hottest day so far this year. With no big changes in the air mass,... Continue reading
Posted Jun 22, 2015 at WBRC Weather
Image
It's hot again today, with temperatures already in the lower 90s at noon. Expect high temperatures this afternoon in the mid 90s again over most of central Alabama. The center of Bill is spinning in eastern Oklahoma right now. Over the next 2 or 3 days, it looks like it... Continue reading
Posted Jun 18, 2015 at WBRC Weather
Image
The big storms have finally moved out of the Birmingham area, and a few remain from Greene County to Hale County to Bibb County. Lightning was almost constant with the storms as they came through Birmingham. There were a few trees down, and power is out to some homes. 0.96"... Continue reading
Posted Jun 9, 2015 at WBRC Weather
Image
Thunderstorms with extremely heavy rain and almost constant lightning are moving southward through the Birmingham area. Some minor street flooding has already been reported, and more is expected. The lightning is also very intense and dangerous, so don't be outside in Jefferson, Shelby, or Tuscaloosa counties in the next hour... Continue reading
Posted Jun 9, 2015 at WBRC Weather
Image
Storms continue to move through Birmingham metro, mainly NE and W suburbs. Here in Trussville, the lightning has been incredible! Multiple strikes within 1 mile of my office. The storms are converging on downtown, and will eventually make it into Hoover. The storms will likely make it into Helena, Pelham,... Continue reading
Posted Jun 9, 2015 at WBRC Weather
Image
Thunderstorms have moved into the Birmingham area from the north this evening, and a thunderstorm warning is in effect for western Jefferson and eastern Tuscaloosa counties for winds maybe over 50 mph. Any of these storms could produce gusty winds and heavy rain, and the biggest threat is lightning. Something... Continue reading
Posted Jun 9, 2015 at WBRC Weather
Image
Today is another pleasant day for early June, with afternoon temperatures only near 80 despite plenty of sunshine, and dewpoints near 60 keeping it from feeling humid. The sun is very strong right now though, as we are only 3 weeks away from the solstice. The highest the sun ever... Continue reading
Posted Jun 3, 2015 at WBRC Weather
Image
Strong winds were associated with a few of the storms last night, apparently the mountains in northern Shelby county had an effect on them, and radar picked it up. In the Doppler velocity image, brighter red indicates stronger winds blowing away from the radar. This radar image is from 0320... Continue reading
Posted Jun 1, 2015 at WBRC Weather
Image
A weak upper-level trough will move through the southeastern U.S. today and tomorrow. This will cool temperatures aloft slightly, making the air more unstable. There will also be a weak front to our north. Afternoon and evening thunderstorms will be more widespread than they were most of the weekend. The... Continue reading
Posted Jun 1, 2015 at WBRC Weather