Archive for February, 2010

Why The Clouds?!

This is probably one of the last visible images of the day before the sun sets, but you can see the clouds are very thick across much of Alabama.  Why did the clouds hang around all afternoon?  Well…I think we can give you a couple of answers. 

The chart above is at the 925mb level….or about 2000-3000ft above the surface.  The blue line represents the freezing line at that level and the bright green represents saturation at that level.  If you notice the winds are coming out of the north at this level where moisture is also present.  Therefore, the low level clouds didn’t really break up very much today.  Over in Georgia where the drier air was present….the clouds were able to erode.  Just another forecasting headache when it comes to temperatures.

Potential Winter Weather Event Late Week

I said earlier that I wasn’t going to talk too much about it, but after going over the model forecast guidance this morning I have been a bit inspired by what I have been seeing.  I will go ahead and get into the system just a bit, but I will caution you that winter weather forecasting more than 2-3 days in advance is just pure speculation at this point.  So….on to the maps!  First we will start with our 2PM regional temps this afternoon.

Current temperatures are running in the 30′s area wide.  We discussed this morning that cloud cover might be an issue and it has.  It just doesn’t look like it will break for most of the area so mid 30′s for the max temps today are a good bet.  Had this thick deck moved out….we would likely be sitting somewhere in the mid/upper 40′s right now.  That just didn’t happen so we will deal with these kind of temps for the remainder of the afternoon.

We are still looking at a rainy system coming in Tuesday with temperatures in the 40′s/50′s during that event so precipitation will remain all rain during that time frame.  Some of the rain could be locally heavy causing some of the more prone areas to deal with some slight flooding issues.  I don’t foresee this as being a huge rain maker, but 1″ or rain is possible.

Now, to the main feature during the period.  Morning guidance has came in alot wetter than some of the previous packages.  We are looking at a situation where cold air will blow in after the Tuesday system.  Another southern stream wave will begin to organize over Texas by late Wednesday into Thursday and allow for surface pressure falls and rain to spread over the Texas area into the Gulf.  As of now, our temperature profiles are beginning to look cold enough that we could deal with some snowfall across portions of Central/North Alabama especially on Friday.  We’ll post a couple of model images below…

This is Friday evening at 6PM.  The Operational GFS model is showing a well defined surface low pressure system about 60 miles south of Pensacola with widespread rain north of the system.  The surface freezing axis runs from about Jackson – Clanton – Atlanta on this run.  There are a couple of other models that are showing this area being below freezing as well.  Current indications are that this area could remain all snow throughout the duration of the storm system.  *IF* this model were to verify….this would be winter storm criteria with some folks seeing a 6″+ snowfall possibly.  As I have said many times, this is just speculation right now but the cards are on the table.

Above are the GFS Ensemble plots for the same time frame.  We use these to note basically if a system is there and if it could be of the winter/spring variety or not.  What I can take from this is that most of the ensemble plots show that it will be a wet system and the freezing line will be near by.  Therefore, all in all confidence is increased because of this.  Most plots are showing a pretty major storm system organizing in the northern Gulf….which follows suit with the operational GFS model.  A few other models…(Canadian/European/FIM) are also showing a system and the cold air in place, so the time to start preparing is coming pretty quickly. 

While we won’t be able to give a more specific forecast until around Wednesday….we are thinking that there will be wintery weather across our state as we head into next weekend.  Stay tuned with us for further updates as we approach this potential winter storm situation.

Clouds Hang Tough

Clouds are hanging tough this morning and area temps especially across central sections are having a very hard time climbing.  The greater Birmingham area is stuck near the freezing mark with 31-33 being reported at most locations….but there are some breaks across the southeast areas where the temps are trying to rocket toward the 40 degree mark.  The clouds are trying to build back in however, and the rise will likely only be temporary at least for the time being.

A major storm system is gathering strength across the four corners region….noted over AZ/NV/UT in the image above.  This system will move eastward and allow for widespread snow/ice/rain to develop across the southern plains later this afternoon.  Winter Storm Warnings are in place over a good portion of Southern Kansas, Northern Oklahoma, North Texas, and Northwest Arkansas.  Snowfall totals of 5-10″ are expected across these areas. 

Rainfall will develop across Central Texas later today where some hail will be possible as cold mid level temperatures overspread the region.  This system will move eastward across the Lower Mississippi Valley and Gulf Coast states on Tuesday and bring rainfall to Alabama.  Amounts of around 1″ will likely be common as with our past couple of systems.  Localized flooding could once again be an issue given the saturated grounds…especially along river basins.

After the first system ejects….cold/dry air will set firmly in place across the state through the end of the week.  At this time…another potential weather maker will develop across Texas during the day on Thursday and move eastward into the Gulf of Mexico.  This system has the potential to bring some precipitation to Alabama.  At this time, I won’t put that into the forecast because the dry air at the lower levels could keep rain or snow from reaching the surface.  However, this could change in later forecasts.  Just keep in mind that we are monitoring the potential for a storm system at the end of the week that could bring frozen precip.  More later…

Wind Advisory….Heavy Rains Continue

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE BIRMINGHAM AL
708 PM CST THU FEB 4 2010

...WINDY CONDITIONS EXPECTED TONIGHT...

ALZ011>015-017>050-051200-
/O.NEW.KBMX.WI.Y.0004.100205T0108Z-100205T1200Z/
MARION-LAMAR-FAYETTE-WINSTON-WALKER-BLOUNT-ETOWAH-CALHOUN-
CHEROKEE-CLEBURNE-PICKENS-TUSCALOOSA-JEFFERSON-SHELBY-ST. CLAIR-
TALLADEGA-CLAY-RANDOLPH-SUMTER-GREENE-HALE-PERRY-BIBB-CHILTON-
COOSA-TALLAPOOSA-CHAMBERS-MARENGO-DALLAS-AUTAUGA-LOWNDES-ELMORE-
MONTGOMERY-MACON-BULLOCK-LEE-RUSSELL-PIKE-BARBOUR-
INCLUDING THE CITIES OF...HAMILTON...SULLIGENT...VERNON...
FAYETTE...DOUBLE SPRINGS...JASPER...ONEONTA...GADSDEN...
ANNISTON...CENTRE...HEFLIN...CARROLLTON...TUSCALOOSA...
BIRMINGHAM...HOOVER...COLUMBIANA...PELHAM...ALABASTER...
PELL CITY...MOODY...TALLADEGA...SYLACAUGA...ASHLAND...ROANOKE...
LIVINGSTON...EUTAW...GREENSBORO...MOUNDVILLE...MARION...
CENTREVILLE...CLANTON...ROCKFORD...ALEXANDER CITY...DADEVILLE...
VALLEY...LANETT...LAFAYETTE...DEMOPOLIS...LINDEN...SELMA...
PRATTVILLE...FORT DEPOSIT...HAYNEVILLE...WETUMPKA...TALLASSEE...
MONTGOMERY...TUSKEGEE...UNION SPRINGS...AUBURN...OPELIKA...
PHENIX CITY...TROY...EUFAULA
708 PM CST THU FEB 4 2010

...WIND ADVISORY IN EFFECT UNTIL 6 AM CST FRIDAY...

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A WIND
ADVISORY...WHICH IS IN EFFECT UNTIL 6 AM CST FRIDAY.

WINDY CONDITIONS WILL BE POSSIBLE TONIGHT AHEAD OF AN APPROACHING
STORM SYSTEM. SUSTAINED EASTERLY WINDS OF 15 TO 20 MPH WILL BE
POSSIBLE WITH WIND GUSTS UP TO 35 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 20 MPH AND HIGHER...
OR WIND GUSTS OF 30 MPH AND HIGHER...ARE EXPECTED. WINDS THIS
STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE
VEHICLES. USE EXTRA CAUTION.

State Wide Soaker

A good soaking is currently ongoing as a surface low cranks up to our south in the Gulf of Mexico.  This rain will continue across the entire area today and will continue to spread and in some cases intensify this afternoon into the overnight.  Rainfall amounts will likely be in the 1-2″ category across most locations.  Seems like the same old story with every system as of late doesn’t it? 

Temperatures area wide are currently in the upper 30′s and low 40′s.  I could see temps topping out in the upper 40′s for most locations, but with the clouds and rainfall hanging tough all day long I don’t see much opportunity for a huge warm up.  Tomorrow will feature the same type of weather with some opportunity for some wintry mixed precip to the north as the system begins to exit the area. 

A cool weekend is on tap with another weather system affecting the area with some interesting precip type chances early in the week.  Will we see some snow or ice?  We won’t get into it too deep right now, but there is some possibility.  It also seems that this pattern is stuck in place so expect a cool/wet weather system every 3-4 days as the southern stream remains active through February. 

Have a great Thursday!

Rain Increasing in the Western Counties

Rain is increasing across the west this hour with moderate rain across portions of Lamar, Marion, Pickens, and Winston counties.  Temperatures are holding steady near the 50° mark across much of the area with the clouds and rain showers in place.  Let’s take a peak at an area camera this evening of where the rainfall is taking place.

Looks like Vernon is dealing with some light rain.  It’s pretty visible that the roadways are wet in downtown as showers are all across the area.  It looks as if this will continue across much of the area as the rainfall extends west and south through a good chunk of Mississippi.  This system will drop between a 1/4″ and 1/2″ max across the area.  We expect the rain to exit tomorrow morning and some clearing by the afternoon.

Warming Up…A Little Rain?

This morning on Water Vapor we note a shortwave and some associated convection moving northeastward into Louisiana and Southern Mississippi.  This will do two things for our weather….allow us to warm up some today into the mid 50′s as well as give us a chance of showers especially to the south of Interstate 20 later into the evening and overnight.  Rainfall amounts should be lighter with most of the rain passing through South Alabama.

We will dry out later tomorrow and stay in the 50′s through much of the week with lows dipping down around the freezing mark.  The next major storm system down the line will begin to crank up by Wednesday to our west with rain spreading northward across the Gulf Coast states later in the night.  We will begin to feel the effects by Thursday with the heaviest rain over the southern 2/3 of the state.  Amounts of 1″ will be common with some locally 2-3″ totals toward the south from about US-84 southward. 

We will chill off again on Friday with temperatures in the mid 40′s and overnight lows dipping down into the 20′s.  This seems to be a continuing pattern with the Arctic/North Atlantic Oscillation dipping toward the negative territory for much of the month.  With an active storm track and cold air coming down the pipe….we will obviously have to keep an eye on any precipitation events that approach over the next 2-3 weeks.  Who cares if the groundhog see’s his shadow?  We already know it’s going to be COLLLLLLD!