Category Archives: forecast

Super Bowl Weather – here.

Leave a reply

Friday afternoon

It’s been quite a story this week – the upcoming snow for Sunday!  All kinds of guesses on local media blogs.  Lots of snow lovers getting excited.  The forecast models are good, but, as I’ve said too many times to count, never trust them beyond a couple of days.  Failure to heed such advice has led to some really wild and crazy things being said about our weather.  But, here it is Friday and the weather picture is taking on a familiar pattern and the news is not good for the snow birds.

Yesterday, the NAM and GFS started coming together on the idea that the primary storm system would be coming right over the lower Ohio Valley.  That should have been a BIG hint that this was going to be mostly rain.  However, the snow birds kept chirping.

The trends established yesterday grew even stronger today lending growing evidence to the rain scenario.  I wouldn’t go so far as to say something stupid like “The science is settled”(one of my favorite idiotic quotes), but it is looking pretty strong.  You can never be totally certain 36-48 hours ahead – things are always changing.

So, with that said, here is my idea as to our weather will unfold this weekend:  Tomorrow will start cold (low 20’s) and sunny with temperatures rising pretty quickly during   the morning and early afternoon.  By then clouds will be on the increase for the rest of the afternoon.  High should be in the lower 40’s.  First divergence point for the models comes Saturday night.  The GFS starts precipitation (as snow) after midnight while the NAM holds any precipitation off until Sunday morning as rain.  The history of the GFS shows that it almost always “warms” systems the closer they come.  So, that situation, if it continues, sets the stage for a rainy Sunday, with the heaviest rain likely between late morning until late afternoon.  An early start to the precipitation could lead to a little wet snow, but temperatures should be above freezing, so little, if any, accumulation.  Chance for morning snow is less than 20%.

If this system brings us any snow it will be Sunday night.  As the storm system pulls out to our eastnortheast, we’ll see a sharp drop in temperatures around 10 P.M. or later Sunday.  It’ll be possible to see some light snow and/or flurries as the cold air pours in.  But, if we see any accumulation, it’ll be small.  Probably in the lower half of the 0 to 1″ range.

 

Wet, windy night ahead

Leave a reply

Sunday afternoon

Strong storm system heading up the Mississippi River will have some big affects for us tonight and tomorrow.  Highlights: (1) Heavy rain this evening should be strongest between 6P.M. and 10 P.M.  Rain should fade quickly after midnight.  (2) Very strong  winds late tonight and all day tomorrow.  Winds will be picking up after midnight and increase to 20-25 mph (steady winds) with gusts 35-40 mph through tomorrow with slow weakening Tuesday.  (3) Colder temperatures move in again.  We’ll stay in the 50’s tonight then fall during the day tomorrow into the 40’s and near 30 by Tuesday morning.

Thanksgiving Outlook

A weak Alberta Clipper will move across the area Wednesday with a good chance for some light rain and/or snow showers.  Colder air follows the Clipper and makes a windy cold Thanksgiving Day – temperatures in the 30’s with some flurries possible.

Warmer weekend

Leave a reply

Friday afternoon

Quite a difference a week can make.  Last week we were looking at a cold weekend ending with snow.  Basically, the same weather patterns exist this Friday with one important exception – the air is much warmer.  So this time we talk rain, not snow.  A weak upper air disturbance will reach us late tonight into tomorrow morning.  The NAM basically ignores any rain potential with this system while the GFS has increased its forecast for rain, but it’s still only about 30%.  Best bet is still no rain, but if any does fall, it’ll be very light (less than .05″).  Rising temperatures tomorrow should push us to 50 or so.  The stronger storm will be late Sunday (both models have slowed this again).  So Sunday should be a warm, windy day with highs near 60.  Lots of clouds, but little rain threat until late afternoon with the heaviest rain likely Sunday night.

Once again, we’ll see colder air arrive Monday, but it looks like next week’s coldest air will arrive for Thanksgiving Day.  Periods of snow flurries/snow showers look like a good bet Wednesday night and Thanksgiving.

Colder again tomorrow and Friday

Leave a reply

Wednesday Afternoon

As it turned out, it wasn’t too difficult to get temperatures above 40.  Unfortunately the milder weather won’t last long.  A moisture-starved upper air disturbance has been passing over the Ohio Valley this afternoon.  All it could do moisture-wise was the clouds this afternoon.  They will fade away tonight.  But this system is also bringing us another shot of unseasonably cold air.  It won’t be as bad as Monday and yesterday, but should hold highs to the mid 30’s tomorrow and near 40 Friday.

It still looks like some rainy (and warmer) weather will arrive by the weekend.  A strong storm is taking shape over the southwestern U.S. and will provide us with at least 3 “waves” of energy before it exits our area.  First, the leading edge of this system will send a weak disturbance our way Saturday.  As often happens, the first surge of energy brings lots of moisture into the area but little, if any, precipitation.  This one looks the same way and if it does produce any rain it will be more likely over southern Indiana rather than Kentucky.  A lot more energy will be tied up in the second system, set to arrive Sunday.  This should bring lots of rain and temperatures rising to near 60 degrees.  Even a thunderstorm will be possible.  A third storm should arrive on Monday.  It’ll prevent any major temperature drop following system 2, but it should bring us some more rain.  Following that system, we’ll see temperatures dropping back to January levels (highs near 40) for a couple of days.

Polar Bear Stuff

Over the past few days, several world newspapers have been carrying stories about a “40% population decline in the past 10 years.”  Brings back Al Gore’s photoshopped picture  of a lonely polar sitting on a small chunk of sea ice with nothing but water anywhere to be seen.  It was the major talking point for his infamous declaration that polar bears would soon disappear because the Arctic would have ice-free summers by 2013 or 12014.  (This summer’s ice cover minimum was 4.9 million square kilometers  Current ice cover is 9.9 sq. km.)

Dr. Susan Crockford is a Canadian zoologist and professor who has been studying polar bears in the Canadian and Alaskan Arctic for more than three decades.  She says the actual data is a whole lot different than the article claims.  Yes, there was a drop in bear population between 2004 and 2006.  Estimated drop was 25-30% of the population.  The time corresponded to a series of years with thicker than normal sea ice in the spring.  (Yes, a colder time.)  Then spring sea ice diminished though about 2012 .  What happened to the bears?  Their population grew back to pre-2004 levels and is thought to be still growing.

Yes, that’s just the opposite of what the so-called greens have been shouting to us for almost a decade.  Just goes to show you what happens when non-scientists start preaching about science!  We could have saved a lot of time and effort if we’d just believed the real experts – the Inuits.  Old saying among the Arctic dwellers- Warming weather brings more polar bears!

Slow warming

Leave a reply

Tuesday Evening

The old wisdom comes through again!  One of oldest forecasting “rules” I remember from college states “Never forecast a weather record.”  Good advice, but ignored by most (maybe all) local forecasters yesterday.  Our morning low was 16, three degrees above the record while some were forecasting as low as 10.

Meanwhile, looking ahead our weather looks like a warming trend (although still below normal) through Friday.  High temperatures should have a hard time getting out of the 30’s and we’ll see a small chance  for flurries tomorrow night.  The cold northerly flow will relax by the weekend, however, as a weak disturbance from the southwest will provide a chance for some light rain Saturday.  A second, stronger, system moves into the area Sunday with rain likely and even a thunderstorm possible.  Colder weather should return Monday.

Record cold…maybe

Leave a reply

Monday Evening

Pretty pictures from nature today as that wet, clinging snow held on tree limbs most of the day.  Forecast worked out pretty well although I would have liked to see the snowfall pattern drop about 20 miles south.  But nature does what it wants, not bothering with us humans and our models.  The official total from the airport came in at 2.9″.  I live about 15 miles northeast of the airport and measured 4.2″ on the ground.  So, a pretty wide variation over a short north/south distance.  Most of southern Indiana and Kentucky (north of I-64) finished in the 3″ to 5″ range while southern Jefferson Co. into Bullitt Co. were more like 1″-3″.

Now, it’s on to the cold.  Tomorrow’s record low is 13 degrees (1959).  With snow on the ground and expected clearing skies tonight, most forecasters are predicting a new record.  The only thing that could get in the way would be the clouds.  Flurries should hold for the next few hours, but it looks as though skies should clear for a least a few hours overnight.  That should be enough to get us to the new record.  But, if the clouds hold, it won’t happen.

 

Snow!!!

Leave a reply

Sunday Afternoon

Forecast models have changed little since yesterday – the NAM is still a little warmer than the GFS.  Short term models (RUC, NAM-hi res and others) fall in between, but tend to be closer to the GFS.  The big question remains – how soon will the rain change to snow?  Obviously for snow lovers, the sooner the change, the better.  I am expecting the change-over to occur in Louisville between 7 and 8P.M.  (earlier in southern IN; later south/east of town.  Snow should be wrapping up by 7 to 8 A.M. tomorrow.

Based on the timing above here is my current forecast (5 P.M.)…Louisville metro area should see an accumulation of heavy wet snow between 3″ and 5″ (on grassy areas, less on the roads).  Southern Indiana should see an accumulation of 4″ to 6″ with KY counties and southern counties along and north of the Ohio River from Louisville toward Cincinnati could receive 6″+.  South of the Louisville area, accumulations should diminish rather quickly.  The E’town area should see 1″-2″ with very little at Bowling Green.  East of Louisville, snow totals should also be lower.  For example, Lexington should get around 1″ to 2″.

As mentioned the past few days, this will be a very wet snow as temperatures hovering a degree or two above/below 32 deg.F.  As the snow will be falling at night, it should have little trouble piling up on grassy areas.  However, the roads are still pretty warm.  That plus traffic should greatly reduce accumulations on the roadways.  The roads will probably only get half as much accumulation as the grassy areas.

snow1      snow2

Stuff

There’s no such thing as bad weather…only varying degrees of good weather.

Rain, snow or both?

Leave a reply

Saturday update

Both models are coming into better agreement over tomorrow night’s weather event.  Both agree that there’s going to be significant precipitation (.25-.50″).  The NAM still favors more rain than snow while the GFS remains colder favoring mostly snow.  If the NAM is correct it’ll be a disappointing wet snow of around an inch.  The GFS favors about 3″ to 5″ inches of snow.  The most recent afternoon run of the NAM is slightly cooler than it was this morning.  My current thinking still leans (somewhat strongly) toward the GFS, but the possibility of a longer stay with the warmer air is beginning to worry me.  We’ll see what it looks like tomorrow!

Snow situation keeps changing

Leave a reply

Friday afternoon

Each day our two primary forecast models get a little closer together on the prediction for snow (or rain) Sunday night…and there’s still a lot that could change over the next 48 hours!

With today’s model runs, the NAM has joined the GFS with the primary precipitation event expected Sunday night into Monday morning.  In fact, the expected preliminary event Saturday night night now looks to be a bust…nothing more than a dusting appears to be the best case scenario now.

If nothing else, the Saturday night system should serve to moisten our very dry atmosphere so that Sunday night’s system should have no problem with moisture supply.  That said, what kind of moisture should we expect?  The NAM model has warmed since yesterday.  If it proves to be correct, the majority of the upcoming storm will probably be rain with a late night change to snow.  That would keep snow accumulations low – probably around an inch.  On the other hand, the GFS keeps us firmly in the colder air.  Possibly a little rain to start, but snow after that.  This, of course, favors a larger accumulation – it still looks as though we have the potential for a 2″ to 4″ snowfall!  Temperatures should be right around 32 degrees (plus or minus a degree or two) so it’ll be a sloppy wet snow (good for snowballs and snowmen).  Accumulations will be highest on grassy areas,  but (since it’ll be mostly at night) roadways will get their share too.

As to which model is going to be right (or, at least, the closest to right), I don’t know.  Years of experience of working with both models has given me this generalization – from 0 to 36 hours the NAM is usually equal to (or better than) the GFS.  Beyond 36 hours, the GFS is almost always better then the NAM.  So snow lovers, the situation looks good for Sunday night…but a lot can happen in 48 hours.  Stay Tuned!

Stuff

Yesterday, I showed pictures of a full 180 degree rainbow (my first ever) taken near Vigo Spain.  That brought to mind a picture I had seem of a full 360 degree rainbow – you can see them from the air above.  Here’s one from Perth Australia.

fullrainbow_leonhardt_1500

Fun Fact:  Damascus Syria is the  believed to be the oldest permanently inhabited city on Earth.  Evidence dates back to a settlement as long ago as 8,000 to 10,000 years B.C.

Winter gets an early start

Leave a reply

Thursday afternoon

After a two month hiatus, I’m back again.  Weather patterns have certainly taken on a winter look early, so perhaps the coldest part of winter may well be the first half with an easing during the later winter.  But, those thoughts are just speculation at thjs point.  The forecasters I think do the best seasonal forecasting  (the gang at Weather Bell Analytics) are predicting another very harsh winter for the eastern two-thirds of the U.S.  One the best analog years is 1976-77.  If you remember, January 1977 was by far the coldest month in Louisville’s history.  That’s not to say it’s going to happen again – just that the weather patterns of the past 6-9 months are a very close parallel to the same time in 1976. And, the winter of ’76-77 ended very early.  By the second week in February, we were into a major warming trend which brought us an early Spring

Meanwhile, the “official” National Weather Service’s winter forecast continues its seemingly decades-long trend of forecasting normal to above normal temperatures for most of the country (only Texas and parts of surrounding states) are predicted to be below normal).  The NWS has had a long running warm bias in their winter outlooks and this year seems to be another in that long string of misses.  Meanwhile, the November temperature outlook issued Oct. 31 has NO area of the U.S. predicted to have below normal temperatures.  Two weeks into that outlook, we know it’s an error of huge proportions.  And, it really puts a major CAUTION sign on the rest of their current suite of products.  Time will tell, but I think Weather Bell is far closer to the truth than our government’s outlook.

WEEKEND SNOW?

Things can certainly change over two days, but at this time it appears to be a case of “How much?” rather than “Will it snow?”  Yesterday the NAM and GFS models were far apart in their solutions as to how the weekend weather pattern will evolve.  Today, they’ve come closer together, but still with different leanings.  On the big picture, both forecast snow for Saturday night into Sunday morning.  Both models expect a weak, unorganized system and thus not much precipitation.  Current estimates place accumulations of up to one inch of snow – mostly on grassy areas.  The big question for the models is What happens next?  The NAM produces a second system Sunday night/early Monday that drops a second snow, but keeps it south and east of Louisville area (watch out eastern KY, could be some heavy snows, if this pans out.)  However, as it often does, the GFS slows things on Sunday and allows a stronger secondary storm system to form.  If this scenario develops, the Louisville area will become a prime target area with a swath of 2″-4″ of snow possible.  But, it’s far too early to know how things will evolve.  More tomorrow!