Sat. May 4, 2019

Another rainy one!

Although it won’t be as bad as last year, we’ll still have our second wet Derby in a row.  After giving us a little hope yesterday, the models have settled back into a slower developing southern system.  That keeps us wet most of the afternoon into the evening.

Here’s how it shapes up:  cloudy this morning followed by periods of light rain most of the afternoon.  Then, the worst part of the forecast.  Expect a period of heavier rain (perhaps even some thunder/lightning) between roughly 5 to 7 P.M.  After the Derby, rain tapers off during the evening.  Temperatures remain in the 60’s all day.

In spite of the weather, I hope you have a Derby winner!

Friday, May 3, 2019

Models backing off from earlier trends.

After giving a promise of rain fading away by early afternoon with models runs from earlier today, tonight”s NAM family has taken most of the hope away.

Forecast now holds rain (mostly light) in Louisville throughout most of the afternoon.  Earliest end to rain now looks like 5 P.M. with a 40% chance it’ll still be raining lightly by Derby time.  Two years in a row!

Friday, May 3, 2019

Latest data shows heavy rains heading south of us

After several days of increasingly gloomy forecasts for Derby Day weather, this morning’s product suite shows a definite trend toward better weather for tomorrow.

Models are now shifting the storm path to a more southerly route.  That means less rain locally and a quicker departure during the early afternoon.  Good news on both fronts.

Assuming this model shift is real, here’s my latest Derby Day forecast:  Light rain during the morning fading away to out southeast by early afternoon.  Some sunshine could show up by late afternoon.  Temperatures will be in the low 60’s during the rain but warm into the low 70’s by late afternoon.  Derby time:  mostly cloudy with a temperature near 72.  Track should be “good.”

Of course, remembering what happened last Derby Day, the above may not be the “last word”.   But the most recent trends are looking much better.

Now, the horses!?   Next question, please.

As a rule                                                                                                                                                             Horses are cruel                                                                                                                                              You bet their number                                                                                                                                       They barely lumber.

Sunday, April 14, 2019  2:45 P.M.

Cooler, drier air takes over

Thunderstorm chances have dropped to near nil as the atmosphere has rapidly drier this afternoon.  Still a chance for some showers over the next few hours as cooler air rushes in. Showers, if any, will be scattered with only about 30-40% areal coverage.

Winds, which did gust once to 40 mph at SDF have remained mostly in the mid to upper 30’s and will slowly diminish for the rest of the afternoon. Temperatures will also begin a rapid drop.

Stuff

Forrest Mars, the inventor of M & M’s, was allergic to peanuts.  Thus, he never got to taste his invention.

Sunday, April 14, 2019  12:30 P.M.

Thunderstorms possible

Sudden heating and increasing dew points for the past few hours have pushed us into an interesting weather pattern for the next 2-3 hours.  A rather diffuse low pressure system has been over us this morning (it brought us the overnight rain).  The low is now moving northeast into northern IN/MI.  That’s why we’ve seen the rapid increase in winds.  But, low level moisture is now dropping!  Also, in the wake of the low, a cold front is now marching from west to east across southern IN and KY.  The front should pass the I-65 corridor between 2 -3 P.M.

Ahead of the front scattered thunderstorms are popping up. Due to the decreasing moisture, no solid line of storms is expected.  But, some isolated storm or two could generate some gusty winds, perhaps (but not likely) even up to 50 mph.  Any thunderstorm threat locally will be over by 3 P.M.  Stronger storms, even a severe storm or two, could pop up over eastern KY later this afternoon.

About those winds…

1).  We are under a Wind Advisory this afternoon.

2).  National Weather Service Definition of a Wind Advisory is sustained winds of 31-39 mph for at least an hour and/or wind gusts of 46 mph to 57 mph.

3).  The current NWS forecast predicts wind gusts up to 40 mph.

4).  The current Hazardous Weather Advisory and Weather Advisory say gusts to 45 mph.

5).  Go figure!  Why issue an Advisory for something they aren’t forecasting?

6).  And, the prediction isn’t even going to happen.  The strongest wind fields are over eastern KY (east of I-75).  Locally, our wind gusts should top out in the mid 30’s.

Stuff

Q is the only letter of the alphabet that does not appear in any state name.

1:45 P.M. Thursday, March 14, 2019

1).  Signs  are showing the upper atmosphere and the lower atmosphere are beginning to “uncouple.”  Basically, that means that the “sweet spot” for severe weather production is fading away.

2).  The general weakening will allow the system to slow its eastward progression.

3).  Best time for Louisville now looks to be 4:30 until 6 P.M.

4).  Strong gusty winds (non thunderstorm) will continue.  Thunderstorm winds could be strong (50 mph or so), but tornado threat is lowering.

11 p.m. Monday, Feb. 18, 2019

Evening update

Evening model runs are, in general, running slower with precipitation onset tomorrow evening.  As a result, that gives more time for the atmosphere to warm.  Thus, the chance for snow has  changed to a very small window.

The result, and updated forecast, is now for rain to begin around 9-10 p.m. tomorrow night and produce 1″-2″ of rain by Wed. afternoon.  Rain may begin as a brief period of snow.  Little, if any, accumulation  is expected.

11:30 A.M. Fri, Feb. 15, 2019

Snow belt stays west and south of Louisville

No model run this morning shows any snowfall for southern Indiana or the Louisville area tonight.  1″-2″ snows are still possible along the KY/TN border area.  But the Louisville area will remain cold and dry.  NWS still persists with it’s 90% chance for snow tonight, but it’s just not going to happen.  Proper snow chance should be in the 10% to 25% range.

Next precipitation for Louisville area should come Sunday with some light rain likely.

Sorry, snow lovers, that’s just the way it is this time.

11 P.M. update 2/14/2019

Latest model runs are leaning toward no snow for the Louisville area Friday night/early Saturday.  Any accumulations will be south of Louisville.

Wed., Feb 6, 2019  4:15 P.M.

South Pole Winter video

Some fantastic video of the Antarctic Winter shot from the South Pole appeared today on http://www.spaceweather.com

Don’t just watch the video, also read how hard it is to operate cameras at the South Pole