Archive for January 10th, 2013

Winds Slowly Diminishing

| January 10, 2013 @ 10:44 pm

It has been a wild night of high winds across Central Alabama as a dying convective system triggered a gravity wave and wake low setup.

The result was widespread 40-50 mph sustained winds with some higher gusts. Winds just off the surface were roaring at near hurricane force. Luckily, we didn’t have any convection to bring those high winds to the ground.

But the 40-50 mph winds with frequent gusts above 60 mph did cause numerous reports of trees and power lines down. The result was scattered power outages.

Many trees fell on houses. Fortunately, we haven’t received any reports of injuries. There was significant damage to the roof of an apartment complex on Princeton Avenue in southwestern Birmingham.

The winds are slowly diminishing, but gusts in the 40-50 mph range could affect eastern sections of Alabama. Higher elevations could see higher gusts.


An interesting notes from Steve Jones at the Alabama Quake Center. He reports that the wind actually caused vibrations in the ground that were picked up by their seismographs.

“Thought you might be interested in what the passage of tonight’s gravity wave looked like at the AlabamaQuake seismic station here in Huntsville. It appears on the seismogram that there were THREE main pulses of winds in the wave’s passage thru Huntsville, with the first being at 8:27 pm, and the last at 9:09 pm, the seismic signature being created due to the pressure impact of the gusty winds on the surface of the local terrain and the trees rooted there; the ground’s vibrations are of course detected on the seismograph.”

Thanks Steve!

And thanks to our skywatchers tonight for their excellent reports!

Tomorrow will be showery but mild, with highs around 70F.

More Reports

| January 10, 2013 @ 9:27 pm

Crazy winds are blowing across Central Alabama, including the Birmingham Metro now.

John Talbot says Homewood PD reports transformers blowing and power going out in parts of the city.

John Talbot and Bryan Falls report a tree down on a vehicle on I-22 at the Flat Top exit.

Windows are reportedly blown out of homes in Pleasant Grove.

Hoover PD reports tree down at Woods of Riverchase Drive and Summit Drive.

Hoover Fire reports tree down in 1200 block of Chester Street.

Be in a safe place as these strong winds blow across eastern Jefferson and Shelby and Chilton Counties, pushing into St. Clair, Talladega and Coosa Counties.

Strong Winds Moving Into The Birmingham Metro

| January 10, 2013 @ 8:41 pm

Peak wind gusts from our SKYCAM network so far…

Tuscaloosa (atop the Tuscaloosa County Courthouse) 74 mph
Oak Grove (Cliff’s Natural Resources) 57 mph
Birmingham (atop the Daniel Building downtown) 41 mph
Cullman 36 mph
Jasper 29 mph

The period of highest winds with this gravity wave/wake low event lasts about 15 minutes, but strong winds are lasting about 30 minutes in most areas.

We have reports of trees and power lines down over Tuscaloosa, Sumter, Pickens, Fayette, and western Jefferson Counties. Power is out in some places.

Winds in the Birmingham metro will average 35-45 mph over the next 30-45 minutes, but gusts could be higher. We don’t have much skill in forecasting these kind of events since there is nothing to show on radar, generally speaking. And, the intense pressure fall/rise couplet is hard to track since there is no real dense surface reporting network.

Scroll down for the details, but this event is not directly related to thunderstorms, and there is no threat of a tornado. A non-preciptation, high wind event.

We did a 2009 WeatherBrains episode on this kind of event if you want to learn more…

Stay tuned for updates as needed…

57 mph Wind Gust at Oak Grove

| January 10, 2013 @ 8:35 pm

Winds just gusted to 57 mph at the Oak Grove Skycam according to James.

The 40-50 mph winds with gusts to 60 mph will continue to spread across much of Central Alabama including the Birmingham Metro over the next hour.

Be ready for weaker trees to be blown down. Some powerlines will be affected. Try to be inside away from the threat of falling trees when the winds approach.

Trees Down, Power Out Western Jefferson County

| January 10, 2013 @ 8:27 pm

A high wind event is moving across Central Alabama tonight.

It has caused numerous reports of downed trees and powerlines, especially across the Tuscaloosa Metro.

A tree was just reported down by the Jefferson County Sheriff’s Office on Warrioir River Road near Steve’s Grocery according to John Talbot.

Ryan Stinnett, one of our meteorologists, reports power is out in parts of western Jefferson County.

Richard Viola reports tree down in Duncanville by the Eagleville FD station. Trees were reported down Samantha in northern Tuscaloosa county.

Winds gusted to 63 mph just before 8 p.m. at East Edge Apartments in Tuscaloosa, on the eastern side of the UA Campus.

Be ready for winds of 40-50 mph with some higher gusts as this gravity wave/wake low pushes east across Central Alabama.

The winds will mainly affect parts of Bibb, Blount, Chilton, Dallas, Hale, Jefferson, Marengo, Perry, Shelby and southeastern Tuscaloosa Counties through 9:30.

High Winds Roar Through Tuscaloosa/West AL

| January 10, 2013 @ 8:07 pm

Winds have gusted to 57 mph at the Tuscaloosa County Courthouse tonight due to a wake low/gravity wave on the back side of a departing rain mass.

Power is out across parts of the city of Tuscaloosa, and many reports of trees and power lines have been received via social networks.

Scroll down for an explanation of this kind of event… the winds are not the direct result of a thunderstorm, and there is no risk of a tornado. The winds are happening, in fact, with no rain.

Winds are averaging in the 35-45 mph range, with gusts to 50-55 mph. The peak winds last about 15 minutes, and then they begin to die down.

The higher winds will impact the Birmingham metro, if it holds together, by 8:45 or so. But remember, this is not a thunderstorm event, it is an entirely different situation, and it remains to be seen how long the high winds will last as the band moves east across Alabama tonight.

Strong Winds Over West Alabama

| January 10, 2013 @ 7:30 pm

Strong winds are reported over much of West Alabama this evening… on the back side of a departing rain mass…


Trees have been blown in a few spots over Sumter and Pickens Counties; from most reports it seems like winds are averaging 35-45 mph, with higher gusts.

LATE NOTE: We just recorded a peak wind gust of 57 mph atop the Tuscaloosa County Courthouse. Now getting reports of trees down across Tuscaloosa and Fayette Counties…

The band of high winds will move east, and could possibly impact the Birmingham metro by 8:45-9:00 p.m. The period of high wind lasts about 15 minutes, followed by a slow decrease in wind speed.

These highs winds are NOT related to thunderstorms directly…

The winds are the result of a wake low/gravity wave combination… I think Kirk Mellish has a good simple explanation…

“A big complex of rain and thunderstorms can push up a lot of air, it then falls back to earth, which causes a rapid change in temp and air pressure over a short distance putting the atmosphere out of balance, the wind accelerated as nature tried to get the atmosphere back in balance or equilibrium. A small mountain of air (high) was followed by a hole in the air (low). The wind rushed from the mountain to fill the hole. The steeper the grade or gradient between the two the harder the climb or the harder the wind. Nature trys to equal out the two to reach a flat known as a stasis. Ocean waves are another example. A rock dropped into a lake and the resulting splash and waves that radiate out from it are another example.”

We are better at identifying wake low/gravity wave setups, but often it can happen without any warning. This is an entirely different process than winds directly from thunderstorms.

The winds will die down later this evening…

Rain, Gusty Winds Push Northeast

| January 10, 2013 @ 6:22 pm
Click image to enlarge

Click image to enlarge

Thunderstorms that have been severe sporadically across Mississippi and Louisiana have weakened as they have moved into the more stable air over West Central Alabama this evening.

They are mainly affecting southern Pickens, Greene, Sumter and Choctaw Counties. They will move into Tuscaloosa, Hale and Marengo Counties in the next hour.

Other heavy showers have formed ahead of the main line, from southern Shelby and Coosa through Chilton and into Autauga and Lowndes Counties.

We can’t really call these showers thunderstorms, since they don’t seem to have much if any in the way of lightning. No lightning was observed at Meridian as they passed. Winds did gust to 35 mph though.

And winds gusted to 40 mph at Tupelo on the back side of the rain area. There was some tree damage in the Tupelo area.

NWS says there are reports of winds of 45 mph in Sumter County.

Interestingly, the winds will be mainly on the back side of the rain area, unlike our typical storms that feature the wind on the front side.

So, rain and some gusty winds will be the only impact. There is no threat of severe weather.

Severe Weather Just to Our West

| January 10, 2013 @ 4:02 pm

We are watching the storm system to our west continue to move slowly east this afternoon. Storms are approaching the state line and a few of them are strong. There is a tornado warned storm in Clarke and Lauderdale Counties inĀ  Mississippi, the latter is the county that Meridian is located. The storm is moving to the north-northeast at 25 mph and is approaching the city of Meridian. We will have to keep an eye on this storm, if it maintains intensity it could be affecting locations in West Alabama in the next hour or so.

1-10-2013 3-57-07 PM

As we head through the rest of the evening, we are expecting showers and thunderstorms to move into Alabama, with some showers in Chilton and Autauga Counties moving north. Looks to be a wet night across Alabama, but any severe weather that may occur will be very isolated. The main threat from this system will be flooding.

Warm, Wet Weather Through The Weekend

| January 10, 2013 @ 3:37 pm

An all new edition of the ABC 33/40 Weather Xtreme video is available in the player on the right sidebar of the blog. You can subscribe to the Weather Xtreme video on iTunes by clicking here.

TOO WARM FOR JANUARY: The average high for January 10 is 52 degrees… today we are well in the 60s, and to the south Montgomery has soared to a balmy 76 degrees. This is the big “January thaw” we have been talking about. Along with the warmth the state is covered by clouds, and we have had a few patches of rain moving northward through the area today. Some of the heaviest rain came at mid-morning at Tuscaloosa.

TO THE WEST: We are watching a batch of heavier showers and storms over East Mississippi, but those will slowly weaken with time, and we still do not expect any severe weather as they try and creep into West Alabama tonight. A tornado watch was in effect earlier for parts of South Mississippi and Louisiana, but it has expired.

ON THE MAPS: A deep, cold upper trough is setting up over the western half of the nation, while a warm ridge is over the east. There will be a huge thermal contrast in coming days across the continental U.S., and we will remain in the warm, moist air east of the front through Sunday.

Expect periods of rain, and possibly a thunderstorm or two tomorrow, Saturday, and Sunday, mainly over the northern half of Alabama. But, the heaviest rain should remain just northwest of our state through Saturday near the front.

HEAVIER RAIN AND TURNING COLDER: As the front gets closer, a band of heavier rain will move into North Alabama late Sunday, Sunday night, and Monday. The temperature difference will be very sharp on either side of the front, and Monday looks like a day with a high in the 40s over Northwest Alabama, with upper 70s over Southeast Alabama near Dothan. The colder air will settle in for the week, so no more 60s or 70s for North Alabama after Sunday.

There is concern the heavy rain band won’t move much Monday and Tuesday, and if it sets up around here we could be looking at potential for 2-4 inches of rain. And, with the soil now almost saturated, that could lead to some flash flooding issues. But, model agreement has not been very good about the exact placement of the heavy rain; we will watch trends in coming days.

FINALLY: Looks like our next chance at a sunny day will come late next week, Thursday, or perhaps Friday. And, we should go below freezing by Thursday morning as cold air continues to settle in over a big snow pack up north, where winter storm watches and warnings are up today from Montana over to Wisconsin.

Take a little time and watch the Weather Xtreme video for all the graphics and details.

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Thanks to Brian Peters for covering for me while I was away in Texas at the AMS annual meeting… look for the next Weather Xtreme video here by 7:00 a.m. tomorrow…

Stuck in Warm/Wet Pattern

| January 10, 2013 @ 7:07 am

An all new edition of the ABC 33/40 Weather Xtreme video is available in the player on the right sidebar of the blog. You can subscribe to the Weather Xtreme video on iTunes by clicking here.

Right now the weather pattern is very slow to change, and we are stuck on the warm and wet side of that pattern. And the first tornado watch of 2013 has been issued for parts of Louisiana and a small section of Southwest Mississippi. Never a dull moment in the weather office.

The closed low that we have been watching for the last several days is moving northward across Texas and should eject north-northeastward to the Ohio River Valley as it slowly weakens. But the Bermuda ridge located along the East Coast of the US is not budging! The result is that the Southeast US remains under a strong southwesterly flow pattern brining warmth and moisture to the area from the Pacific and the western Gulf of Mexico.

As the closed low ejects today, there is a risk of severe storms with isolated tornadoes primarily over Southeast Louisiana where shear values will be the greatest. Marginal conditions supportive of severe storms may extend northward to the Missouri Bootheel area, but that depends on how far northward the 60-degree dew points will surge. With the fast motion of the upper low, severe weather potential will decrease fairly quickly as the low ejects north-northeastward tonight and early Friday with no areas of severe weather potential outlined for Days 2 to 3.

Without something to push the frontal boundary further southward and southeastward, we will stay in and near the narrow corridor of moisture, so rain and showers will be possible for the next 5 to 6 days as small upper level impulses come out of the southwestern US. Rest assured that we are not looking at continuous rain for the next 5 days, but rain chances will remain in the forecast until we can see the pattern shift enough to finally push that trough anchored over the Southwest US eastward. And the current model guidance suggests that won’t happen until next Thursday. So keep the umbrella handy, but don’t put the winter coats back into storage just yet.

Looking further into the future, the GFS is suggesting the pattern will change around the 20th as we see the long wave trough position over the eastern half of the US. And around the 25th, a strong short wave moving through the long wave trough presents a wet scenario with potential for some winter weather just to our north. No, I’m not jumping out on that limb – after all, this is way out in voodoo country. But the pattern does suggest a winter storm event from West Tennessee to Ohio. So we’ll see how that plays out.

And you can follow news and weather updates from ABC 33/40 on Twitter here. Stay in the know by following the whole gang – here’s the list…

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James Spann received the American Meteorological Society’s Award for Broadcast Meteorology at a banquet in Austin, TX, held in conjunction with the AMS annual meeting. Certainly congratulate him for an honor well deserved! I believe he plans to post an afternoon Weather Xtreme Video by 4 pm or so. I’m glad that I could fill in for him, so he could attend the AMS meeting to receive the award. Enjoy the day and Godspeed.


First Tornado Watch Of 2013

| January 10, 2013 @ 5:41 am


Tornado watch number one is up for much of Louisiana and SW Mississippi until 12 noon CST… a pretty nasty looking squall line is moving through that region this morning.

Screen Shot 2013-01-10 at 5.38.16 AM

While showers and storms are likely across Alabama today and tonight, we don’t expect severe weather here.

Our weather will be warm and wet through early next week, and there is still concern for a flooding situation early next week somewhere in Alabama as a surface front just creeps through. And, we expect a huge temperature contrast early next week as well from northwest to southeast. How much rain, and the temperatures will all depend on the location of the front, and there is some model disagreement.

Below is the latest forecast accumulated precipitation from the GFS through Wednesday evening of next week…


I am traveling back to Alabama this morning; Brian Peters will be along shortly with a fresh Weather Xtreme video and a detailed discussion. Stay tuned…