Category Archives: forecast

Exciting few hours ahead

Fri. Jan 28, 2022  3 P.M.

A small, fast moving and potent upper disturbance will race across our area from now until about 7 P.M.

Most of the area will see snow showers and flurries with accumulations up to one inch.  However, a narrow swath of much heavier snow showers, about 25-40 miles across, will be embedded in the wider snow area.  Forecast models are currently projecting the axis of heavier snow to run from southern Indiana (west of I-65)  through Louisville metro then southsoutheastward  through KY.

Models project 2″-4″ of quick hitting snow squalls in narrow lines within this snow swath.  Meanwhile spots only a few miles from the heavy snow will see very little.  Wouldn’t it be cool to be lucky enough yourself in the middle of the action?  Unfortunately, most of us will be in the “near-miss” category.

Little, if any, snow tonight

4 P.M.  Wed., Jan. 19, 2022

Short term models continue to push tonight’s area of accumulating snow south.  Latest GFS isn’t out yet, but the trend is clear from the NAM, Nam HiRes, RUC and HRRR.  Louisville area should see possibly a dusting (less than a half inch) (two models) or nothing (two models).  So the pickings are pretty lean for snow lovers locally.

It’s a different story, however, for southern and eastern KY.  Wide area south and east of a line from southern Hardin County to  Frankfort to Ashland will see accumulations from 2″ to 4″.  Some spots will probably top 4″.

Louisville appears destined to see just a short period of snow.  Rain-to-snow changeover should happen between 6 and 7 P.M.  Any significant precipitation will end shortly thereafter.  That should add up to a dusting, at best.

Seasonably cold weather air takes over tonight and should last through Friday.

Stuff

Of every 15 potential cancer treatment drugs submitted to the FDA for approval, about 14 never make it out of the testing phase.

Snow chances fading

Three Chances for snow ahead

6 P.M. Friday, Jan. 14, 2022

Major upper air disturbance dropping south through central U.S. tonight will continue dropping heavy snows from southern Minnesota to Iowa to northern Missouri.  Some spots (especially central Iowa) could get 8″+.  Snow falls will lessen as the storm loses the upslope surface winds from central Missouri into Arkansas.  Any significant snows from this system will stay west of us, but the Louisville could get snow showers tomorrow morning.  No accumulation expected here.

Meanwhile, the upper air storm is expected to drop all the way to southern Louisiana, drift eastward for awhile, then head up the Appalachians Sunday afternoon and night.  This, too, should become a major snow-maker.  Highest snow totals will ride along and east of the mountains.

As the storm intensifies Sunday, the precipitation shield will expand westward.  This could reach as far west as Louisville, but we’ll be too far west to see anything significant.  Less than an inch, if anything for Louisville.  A little rain could mix in as well. East of a line from Bowling Green to Lexington to Ashland could see several inches.

As the storm accelerates northeast Sunday night, a cold front will sweep across IN/KY early Monday morning.  This will bring us our third chance for snow.  It’ll probably just be some flurries and/or snow showers.  Little, if any, snow expected.

Frustrating!

Model reversal

Thursday, Jan. 13, 2022  5:30 P.M.

Models still far apart

Yesterday, the GFS was predicting a big snow Sunday while the Blend of models was predicting little to no snow.  Today’s the Nam’s forecast reaches out to Sunday and offers another opinion.

Today, the GFS takes the storm considerably farther south before heading north along the Appalachians.  That means for us:  1″-2″ Sunday.

The BLEND continues on it’s southern track and a little east along the mountains.  For us: little, if any, snow.  If yes to snow, up to an inch.

The latest NAM has the storm track a little north and west of the GFS prediction.  Projection for us:  2″ – 4″ starting late Saturday.

Tomorrow: check back to see if the models get any closer to agreement.

Stuff

About 75 to 80 shark bites are reported around the world each year.  In New York City, however, roughly TEN times more bites are reported of people biting people.

Snow Thursday

Little change since yesterday

11 P.M. Wednesday, Jan. 5, 2022

Model outlooks are little changed since yesterday.  The GFS predicts the lowest accumulation with the NAM products and model blend about an inch to two higher.

GFS – 1″-2″

Nam- 2-3″

Blend has 2.3″ for Louisville

Snow should begin around 11 A.M. and end before 6 P.M.

My thoughts:  Many times I’ve wished the NAM would be correct, but most of the time the GFS turns out better.  So I’d say Louisville area 1-2″ with increasing snowfalls south and east.  Could top 8″ over southeast KY.

Think snow!

La Nina winter working normally

Just like it’s supposed to be.

Tuesday, January 4, 2022

El Ninos get most of the attention, but little sister (La Nina) can step to the plate just as well.  Both systems can be traced back centuries and they tend to operate in irregular cycles.  Over a cycle of decades we’ll see long periods where El Ninos are more frequent and stronger than La Ninas.  One of those started fading about 5-10 years ago.  We’re now in a cycle where the La Ninas dominate.

We are currently in a moderate La Nina phase.  During a La Nina time, the jet stream over the Paciific is pushed northward so that heavy winter precipitation hits northern California, Oregon and Washington while leaving southern California and Arizona very dry. Example: snowfall in Oregon in December set a record high.

After the west coast, the jet stream generally runs along the U.S.- Canadian border before dipping into the northeast.  That was the story for December as most of the U.S. had a very warm December.  Meanwhile, Canada was very cold compared to normal.

But, as the cold dome builds to our north, it eventually has to break under the jet stream and head south.  Right on schedule, that’s what is happening now.  The cold dome is breaking free.  The past couple of days have actually produced below normal temperatures.  And another lobe of even colder air will arrive tomorrow.  That should keep temperatures below freezing Thursday and maybe Friday.

In addition, a weak disturbance will form along the cold front to our south and spread some snow as far north as southern Indiana.  The water content will be very low, but with temperatures in the 20’s light snow should be able to “fluff up” to about 1-2″ Thursday afternoon and evening.

When the cold air dips out of Canada, history shows that the below normal temperatures and snow chances increase for two-three weeks.  So look for unseasonable cold weather into mid January.  By that time Canada has lost most of its excessive cold dome.  Rebuilding begins up north, and abnormally warm weather returns to much of the U.S.  Translation:  February will be very warm.  However, often a La Nina winter ends with another round of the cold air escaping Canada in early March.

Such is life in an La Nina winter!

Dry weather continues.

Rain chances are fading

Friday, August 13, 2021  4 P.M.

Looks like the “Friday the thirteenth” superstition will come true in at least one topic today…rainfall.  All week forecasters have been pointing to today as our best bet for some rain to ease our lengthening dry spell.  Now, however, it seems likely the rain won’t develop locally.

A weak cool front is slowly working southward over Indiana, but this front has been unable to generate any showers/thunderstorms today.  And most likely won’t be able to.  Instead, a line of showers and thunderstorms formed just east of us earlier this afternoon and is moving into northeastern KY.

Still some hope the front could kick up some rain this evening, but don’t count on it.  Short term models keep us dry tonight.  Needed rainfall won’t return until Monday afternoon at the earliest.

Stuff

Starting in the late 1890’s, Scottish-American industrialist donated funding to build 2509 libraries around the world.  1679 were in the U.S.  Indiana built 156 Carnegie Libraries while 23 were built in Kentucky.  Louisville got a $450,000 grant in 1899 to build 9 public libraries.

From 70 degrees to snow in 12 hours?

Tuesday, April 20, 2021  6 P.M.

It could happen tonight!

Our weather has been pretty dull lately.  Dull in the sense that not much “weather” has been nearby.  So most of April has been quite pleasant.  The absence of typical stormy Spring weather has allowed a great opportunity to see more of nature’s awakening beauty.

But, tonight’s weather could be highly unusual.  A small, but very cold, upper air system will drift over us tonight.  It’ll bring along a pocket of colder air behind a developing cold front.  That will provide enough lift to squeeze some moisture out of the atmosphere.  It won’t be much (less than a quarter inch) and won’t last long (from about 10 P.M. to 4 A.M.).  However, the upper level cold air will produce snow.  The big question will be “How soon will the surface cold air arrive.” At onset, the snow will be melted by the currently mild air so we’ll see rain.  The rain will help cool (by evaporation) the low-level temperatures.  That, along with the colder air advancing into our area, will create rapidly falling temperatures.  By about 2 A.M. temperatures should drop into the upper 30’s.  Then, the colder air will slow the melting process.  Basically, the smaller snow flakes will melt while the larger flakes should be able to make it to the surface before completely melting.  Over the next two hours temperatures may drop another degree or two, so at times it may become only very wet snow.  Then, by 4 A.M.  the steady rain/snow will move east of our area.

Snow accumulation?  Not likely on the ground or roadways.  However, some tree limbs, rooftops and cars/trucks could see small accumulations.

Then we’ll have a couple of unseasonably cool days before Spring returns.

Stuff

36 degrees is the 50%-50% temperature for rain and/or snow. Above 36 the odds rapidly favor rain.  Below 36, the odd rapidly favor snow.

Guns:  Since 1975, guns have been responsible for  the death of 1.5 million Americans. Since the Revolutionary War, about 1.4 million Americans have died in all U.S. wars and conflicts.  (Seems like our “well armed militia” is better at killing Americans than enemy combatants.)  Does anyone see a problem here?

 

 

 

Strong Spring Storm in the area

Thursday, March 25, 2021  5:30 P.M.

Lots of wind, possibly strong storms

The atmosphere is certainly in a severe storms state.  Moisture rushing northward and really strong wind fields to work with.  That’s pretty much the story from the deep south to the Great Lakes region.  But, I’ll try to pin things down to more detail.

The easiest part of the forecast is the location of the worst weather.  Severe thunderstorms and tornadoes are likely over a large part of the south – eastern MS, northern half of AL and most of TN are the primary spot for damaging storms.

Next, northeast MO, southeast IA and northern IL and IN are likely to see  heavy rain and, especially, very strong winds.  These will not be thunderstorm wind gusts.  The combination of storm development and upper level winds will combine to generate sustained winds over 40 mph with gusts over 60 mph for several hours tonight.  I wouldn’t be surprised if a few reports of gusts over 70 mph are measured.

So, I guess the good news is that the worst weather conditions expected tonight will be either considerably north or south of the Ohio River.  But, what happens to that space in between?  That’s us.

The Storm Prediction Center has the western half of Kentucky and southwest corner of IN  (and others) in a Tornado Watch until Midnight.  They expect a line of strong to severe thunderstorms to develop just east of the Mississippi River during the next hour or so.  They expect intensification of the line as it sweeps eastward toward us.  Primary threat time for the Louisville area will be 9 P.M. until 11 P.M.   They say severe storms are likely and some tornadoes are expected, especially over the western third of KY and TN.

Most forecast models are downplaying this line of storms for central KY and southern IN.  We’ll have to keep an eye out to see how things evolve over the next few hours.  The models suggest the instability will remain quite low tonight.  If that is correct, we’ll see a quick-hitting line of gusty thunderstorms tonight, but no major problems.

However, a different problem could create troubles for a few hours after Midnight – strong winds!  Several  paragraphs above I mentioned the non-thunderstorm winds likely northwest of us this evening.  Well, as the surface storm center moves across Indiana this evening, the door opens for the northwesterly winds behind the system to rotate southeast into our area.  We’ll see about 4-6 hours of wind gusts above 40 mph here and probably over 50 mph over southern IN.

Note to storm watchers

We expect to see a relatively narrow line of rain/thunderstorms to cross the area during the evening.  Severe storms will likely be embedded in this line, especially to our west.  If, however, if you see any “discrete” cells of thunderstorms, WATCH OUT.  These stand-alone single cells can be very dangerous in situations like this.  The strongest tornadoes almost always are produced by these rapidly moving discrete cells.  It is not too uncommon for very intense dynamics (the strong wind fields) to overcome a weak moisture supply.  The next six hours could become very interesting.

A PREDICTION:  A Severe Thunderstorm Warning will be issued for Jefferson County KY later this evening.  (When is the last time you remember when a storm Warning has NOT been issued for Jefferson County as a line of strong thunderstorms passes through?   Yep, I can’t remember either. )

Rainy weekend – mostly at night

5 P.M.  Friday, Feb. 26, 2021

Two upper air disturbances will float over the Ohio Valley this weekend.  The weaker one we’re seeing now.  Mostly light showers will be scattered over the area this evening…ending after Midnight.  Tomorrow will be warmer with mostly cloudy skies pushing temperatures into the mid 60’s.  The second system will have more moisture and energy, heavier rains will be likely tomorrow night into Sunday morning.  Our area should expect over an inch of rain with warm temperatures tomorrow night.  Temperatures remain warm Sunday.

This time no major storm development is expected, so no major surge will move in as the rain stops, so temperatures should remain seasonably mild early next week.  The average high temperature in early March is in the lower 50’s.

I have seen the future…and it is here.  part 2

The recent ice storm disaster in Texas has been used as quite a political tool for various ideologies.  The right blames solar and wind power problems (partly correct).  The left blames fossil fuel problems (partly correct).  Many say the state-run power network was the cause (big contributor).  Still others blame climate change (probably not – ice storms in Texas have a long history).  Actually, many factors combined to make a situation far worse than it should have been.

Most at fault is the government of Texas.  To allow the statewide power grid to reach the ridiculous situation that exists there today is a wonderful example of political corruption based on money rather than the public good.  It’s a rag-rag operation of little operators with little coordination.  It’s like one of those dominoes creations where you tip over one domino and hundreds  (or thousands)  more also tip over.

In recent years, a push toward solar and wind power generation has been established.  Today that produces roughly 10-11% of Texas’s total power input.  Wind and solar are unreliable because sometimes the wind doesn’t blow and the sun doesn’t shine.  But losing just 10% of your power supply shouldn’t do much damage to the overall grid.  Most of the power comes from good old fashioned power plants using either coal, oil or natural gas.  Texas also produces some nuclear power.  In recent years, for environmental concerns, coal and oil plants have been phased out along with nuclear power.  The use of natural gas, the cleanest fossil fuel, has been growing rapidly.  Okay, most states are doing the same thing, so what went wrong?

In the push to increase natural gas usage and build wind and solar facilities, something has been either forgotten or neglected, or both.  Infrastructure!  No repairs. No updates.  No improvements to existing equipment.  The existing infrastructure has been falling apart.  In a crisis they can’t ask neighboring states to sell them some extra power (state law).  So, when a crisis hits -usually winter storms and summer heat waves – they are stuck.

The way things are going, the power situation in Texas will get far worse before it gets better.  The best thing they can do to clean up their power mess is to build nuclear power plants.

Texas is not alone in this rush to “clean energy.”  Many other states are losing their energy independence.  More on that on part 3.