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
Wednesday, Feb 6, 2019 11:30 A.M.
Lessening threat for flooding
Morning runs from the GFS and NAM both are lowering the rain estimates for the next 36 hours. Since yesterday, radar rainfall estimates are under 1/2″ for southern Jefferson County rising to about .75″ along and north of the Ohio River. Heaviest rain so far has been over southcentral IN.
Heaviest rain will shift into southern KY this afternoon as rain diminishes (for awhile) for northern KY and southern IN. Periods of rain return tonight and tomorrow. Now appears like the total will run between 1.5″ and 2″ for most of Louisville area with higher totals over southern KY.
Sat. Feb. 2, 2019
Early spring has arrived
We’ve now completed the cycle created by the Sudden Stratosphere Warming we began talking about about a month ago. The breakoff vorticies from the polar jet stream have retreated northward to allow warmer air to take over. The last segment of the polar vortex to hit the U.S. was extremely cold for the Great Lakes and northeast but moderated quickly as it pushed southward. We didn’t even drop to zero ( 3 was the lowest), so it certainly wasn’t even close to “record breaking” as it was to our north and east.
With the polar jet now back home, the next few (maybe, many) systems to produce our weather will arrive via the Pacific Ocean, so they’ll be warmer. And, with a little help from the Gulf of Mexico, probably wetter as well. The first will arrive Monday night. Then, a large slow-moving system could provide periods of rain from Wednesday through Friday.
The GFS isn’t even hinting at decent snow chances for the next couple of weeks. We’re going back to the West Coast Cold – Eastern U.S. Warm pattern that was prominent from late December to early January. Get out your raincoat and put away the snow shovel for awhile.
Punxsutawney Phil was rudely awakened from his hibernation around daybreak today. His handler then read a statement “supposedly” from Phil. The guy in the funny top hat announced that we’ll have an early spring.
The GFS and the seasonal model both say the same thing – early spring. I consider that a far superior source for weather data.
Saturday, Jan. 26, 2019
Flurries tonight, Monday night is still a possibility
We’ve had some very light flurries early this morning, after sunrise, and again this afternoon. Still, nothing to show for the effort. But, this evening’s clipper may give us at least a dusting.
The weak clipper has be producing very light snow across southwestern Indiana this afternoon and is moving eastward. It’s also weakening. Very little snow (if any) will drop south of I-64 tonight, so this system will be mostly north of Louisville. We’ll probably see some flurries twice this evening – centered around 6 and 11 P.M. No more than a dusting is expected anywhere near Louisville. Low tonight in the upper 20’s and not much increase tomorrow with highs about the mid 30’s.
Monday into Tuesday
For the past several posts, I’ve been pointing toward a strong Alberta Clipper expected to move into the western Great Lakes early next week. Models are now projecting the primary snow chance for us Monday evening. South of Clipper Monday, we’ll see see strong southwesterly winds and a quick warming into the 40’s. The cold front trailing the clipper will push across central IN/KY Monday evening. That will bring us the coldest air mass of the season Tuesday through Thursday. Temperatures should drop to the lower single digits a couple of days.
What about snow?
Yesterday I mentioned the (to me) unusually high amount of precipitation the GFS was projecting with that front. The weather south of clippers is usually quite dry. Today, the GFS forecast reduces the rain/snow totals considerably. The NAM is also low. That seems much more reasonable to me. But, it also reduces the snow potential to less than an inch. It’s early, things could change.
Jan. 21, 2019
Previous post accidentally described the next system to reach us as a negatively tilted trough. That is incorrect. Trough is positively tilted. In general, positively tilted troughs produce weak weather systems. Negative tilted troughs are far more energetic.
Sorry for the mistake.
Click on the corrected post (to the right).
Friday, July 20, 2018 Noon
…we’ll probably get lucky.
Unusually strong summer system is dropping southeast from the western Great Lakes and should trigger numerous strong-to-severe thunderstorms this afternoon/evening.
Morning rains set up the higher moisture, now the upper dynamics have plenty to work with. Lucky thing for us is that the next big surge of upper energy is approaching rapidly and probably won’t get enough heat energy to kick off storms until it is either right over us or to our east.
Storms should start organizing between 2-3 P.M. near I-65 and move rapidly southeast. Some scattered severe activity is possible in the I-65 corridor, but these storms will get better organized and much more dangerous east of I-65. Widespread severe weather is likely over the eastern half of KY this afternoon/evening.
Luckily, most (if not all) of the damaging weather will be east of the Louisville metro.
Watch the skies this afternoon.
Thursday, May 31, 2018 5:45 P.M.
Development to our west is still slow. Primary development, as expected, will stay south (where the energy is) with heaviest storms over western TN. A weaker bit of energy may still work its way up the Ohio River tonight, but that looks like it’ll be later than I originally thought…probably arriving around 11 P.M. to Midnight. No problems with this system, if it arrives.
Comment: This has been a really bad month for Louisville area forecasters. It’s only fitting that the current NWS forecast seems destined to join the faulty list. My guess is they haven’t taken into account the changes caused by this afternoon’s storm system.
3:30 P.M. 5/26/2018
Rain/thundershowers over southern IN have remained weak and are not showing any indication of dropping into KY. So, there will still be a slight chance for a shower later today or tonight, but most, if not all, of the Louisville area will stay dry through the weekend. But, it’ll be hot! Have fun!