Bill Murray wrote a great here on the blog yesterday about raising the bar for severe thunderstorm warning criteria. I have been an advocate of this for a number of years since I really have a hard time finding anyone who really pays attention to severe thunderstorm warnings.

I have discussed this often on our old "Weather Talk" articles before the blog format started.

Our friend Jason Kelly down in Panama City tipped us off concerning a trial NWS program in three of their offices this year. The severe hail criteria will be raised from 3/4” in diameter to 1” in diameter in Wichita, Springfield, MO, and Pleasant Hill, MO. I am optimistic that this trial will work out nicely, and I expect the NWS at some point down the road to raise the severe hail criteria to 1” nationwide. This should cut back on the number of marginal severe thunderstorm warnings.

I expect the severe thunderstorm wind criteria to remain at 58 mph due to demand from EMA officials and the public. And, I am pretty much in agreement that this criteria needs to remain unchanged. We just need to be certain that winds really are 58 mph or higher if a warning is issued based on wind.

I also would like to see one additional message created called a “severe thunderstorm emergency”. This would be used in a rare situation like a major Derecho when winds can be very widespread, and possibly exceeding 100 mph. A good example of this was when a severe storm hit Memphis during the early morning hours on July 22, 2003...winds of up to 100 mph shredded the city. Roofs of some building came off. Half the city was without power. Damages topped $6 million; cleanup costs were over $40 million. Most folks that day simply ignored the “standard” severe thunderstorm warning as usual... which was issued well before the damage started. I would suggest a "severe thunderstorm emergency" would have captured more attention.

I also believe the "tornado emergency", which is now being used informally by the NWS should be a formal part of the warning package as well. Reserved when a significant tornado is being watched by spotters and is causing significant damage. A good example of this would be the Tuscaloosa tornado of December 16, 2000, when the world was watching that big F4 on our live towercam.

Thanks to everyone who posted comments on Bill's original post... very interesting....

In our current forecast, we mention "a few snow flurries possible overnight." Still looks that way although certainly no significant snow.

A sizeable patch of moisture is now over North Mississippi and it is being picked up on Memphis and Columbus, Miss., doppler radar. It is moving ESE. This will be the key to whether we see any flurries late tonight or in the wee morning hours. Most of what is showing on radar is not yet reaching the ground.

The base of the 500 millibar trough is now over North Mississippi and colder temperatures are moving in at lower levels such as 850 millibars (about 5,000 feet)

So there is a decent chance of seeing some o9f those elusive flakes late tonight and very early Tuesday. Don't lose sleep over it because it will not be a big deal!

Running a little late today as expected due to the drive up to Hamilton. Had a GREAT time with the Hamilton Middle School kids and the Kiwanis club.

The Monday afternoon video update is on the server:

http://beta.abc3340.com/weather/video.hrb

Here is a quick look at coming attractions in Alabama weather:

*Snow flurries tonight. Sure looks like it as we watch the precipitation with the next impulse rotating around the bottom of the upper air trough. Looks like flurries tonight from about 11:00 p.m. until 4:00 a.m. Most folks will sleep through them...

*Cold air air rolls in here tomorrow with an icy northwest wind and temperatures struggling to reach the low to mid 40s despite the return of sunshine. We will have a widespread freeze early Wednesday morning, with most places dropping into the 22 to 27 degree range. The coldest valleys should reach the upper teens. Welcome to March!


*The next storm system will form to the west of Alabama Wednesday night, and will bring clouds back in here Thursday. J.B. Elliott has introduced the chance of some scattered light rain on Thursday, but the heaviest stuff will probably remain to the south. Any snow on Thursday or Thursday night? Thickness values are pretty marginal for that, but we will keep an eye on it.

*The clipper system over the weekend will have to be watched as well. Those can be very pesky. The GFS shows a very strong clipper system, but one that is starved for moisture. Some light snow looks likely for Tennessee and Kentucky over the weekend, and maybe a few flakes for the Tennessee Valley of extreme north Alabama. For now we will leave our forecast dry... I will take a closer look at that this evening.

*And, the pattern flips to a stormy one for mid-month if the GFS is correct. Watch the video for details!

Have to get to work on the TV side... running about one hour behind the normal schedule today....

Here is the latest on snow in the east today through Tuesday:

GREAT SMOKY MOUNTAIN REGION
Between now and Tuesday night, 4 to 8 inches accumulating. Snow will diminish Tuesday night.

EXTREME NORTHEAST TENNESSEE (MOUNTAIN CITY AREA)
Snow this morning, mixed with rain this afternoon. 1 to 5 inches accumulating today, especially higher terrain...an additional 1 to 3 inches tonight. Snow showers continue Tuesday. Total accumulations for today through Tuesday 4 to 8 inches. Quite windy especially Tuesday with gusts to 40 MPH.

WASHINGTON-BALTIMORE
4 to 7 inches accumulating today and tonight. Not real cold. Low tonight 30 and high Tuesday 40.

NORTH VIRGINIA (PLACES LIKE HOT SPRINGS)
Total 5 to 8 inches expected. Becoming windy with wind chill tonight +5

PHILADELPHIA
2 to 4 inches by nightfall, additional 2-4 inches tonight, storm total 4-8 inches.

NEW YORK CITY
2 to 3 inches this afternoon, snow continues tonight with storm total accumulation 6 to 10 inches. Light snow continues Tuesday with a high 38.

BOSTON
Snow beginning this afternoon becoming heavy tonight. Accumulation 5 to 9 inches tonight and Tuesday. May be mixed with freezing rain after midnight tonight. Winds increasing reaching gusts to 40 from the NE toward midnight. Low tonight 30. High Tuesday 35.

This same storm system triggered a Tornado Watch in Florida Sunday along with some very heavy rain:

3.40 inches at Melbourne
3.49 at Apalachicola
5.17 at Sarasota
7.30 inches in Manatee County

The Monday morning video is on the server:

http://beta.abc3340.com/weather/video.hrb

We are at that time of the year when we barely have time to sit down and gather our thoughts. I am off to Hamilton today to speak to the middle school kids at 11:00, and then the Kiwanis club at 12:00. The afternoon update might be a few minutes late today due to the schedule, but it should be posted sometime between 3:30 and 4:00.

Tomorrow marks the first day of meteorological spring, but it will feel more like the first day of meteorological winter. Today won't exactly be a lovely spring day either.

Clouds, some light rain, and a chilly wind will continue across Alabama today as a push of very cold air approaches from the north. Scattered snow flurries are likely tonight over the northern third of the state, but we don't expect any accumulation or travel issues. The best chance of flurries will come between about midnight and 4:00 a.m., so most folks will sleep through it anyway.

If you want to see some snow, try Washington, Baltimore, Philadelphia, New York City, or Boston. A major winter storm will drop between 6 to 12 inches on our pals up there, with some places seeing more than one foot.

Tomorrow will be a windy and cold day as the sun returns. Our coldest morning will come Wednesday morning, with most places dropping into the 20 to 25 degree range. The colder valleys could reach the teens.

Anyone remember a week ago when the GFS MOS products were advertising 60s for tomorrow and Wednesday?????

OTHER COMING ATTRACTIONS

Last week we mentioned one, maybe two winter storm threats for the deep south during the first part of March. Unfortunately for the snow fans it is beginning to look like both of them won't be an issue in Alabama:

*Our end of the week storm should pass too far to the south to really bother us. That was our first hope for snow fans in this March cold snap. A nice wave will indeed pass through the central Gulf, but the precipitation shield should remain near the coast and over the Gulf waters Wednesday night and Thursday. We will see some clouds here, but any precipitation looks very unlikely.

*The next issue is the clipper system this weekend. The models bring some light snow southward into Kentucky and Tennessee late Saturday an Saturday night, but the system sweeps to the east quickly, and with little moisture to work with I am not going to mention anything for us at this time. Clipper systems rarely produce any significant snow in north Alabama anyway.

As we go past seven days, the NAO, while still negative, begins to trend back to neutral territory and the main trough axis shifts to the east. This suggests a gradual warming trend beyond seven days, with temperatures finally back to normal levels by mid-month. The pattern also suggests we might be getting into a stormy set-up at mid month; we have to remember this is the tornado season.

AND... don't forget our final Storm Alert 2005 show is Wednesday night this week at Mountaintop Community Church in Vestavia, not far off U.S. 31. The show begins at 7:00, and this will be the one opportunity to see the show in the Birmingham metro area. See you there!

Very interesting post by Bill Murray below... I have strong thoughts on the subject and will try to post them later today or tonight...