I am seeing plenty of signs from the SEO community, the tracking tools and so on that there was and is a Google algorithm update going on right now. It started on March 12th, yesterday and is continuing on today. It is early on, this is not confirmed by Google, but I am seeing plenty of chatter and signals of an update.
Update: This is now confirmed by Google:
Danny Sullivan confirmed it started yesterday, March 12th:
The last update we reported on was also unconfirmed and was on March 1st, before that February 27th and February 22nd.
The ongoing WebmasterWorld forums have these comments from SEOs:
Now for the tracking tools that track fluctuations in the Google search results.
Have you noticed changes in the past 24 hours or so? Please let us know.
Forum discussion at WebmasterWorld.
Update 1: Google confirmed the update, more details above.
Update 2: Brett Tabke of WebmasterWorld named it the Florida 2 update, so we are going to go with the Google 3/12 broad core Florida 2 update.
Update 3: Here are all our current stories as of March 27th on the Google core update from March:
Google Search Ranking Algorithm Update On March 12 (Florida 2), March 13, 2019
When Naming The Google 3/12 Broad Core Ranking Update Florida 2, March 14, 2019
Google Names The 3/12 Update The “March 2019 Core Update”, March 15, 2019
Speculation Around The Google March 2019 Core Update, March 15, 2019
Survey: Tell Us How You Were Impacted By The Google March 2019 Core Update, March 15, 2019
Google March 2019 Core Update Had Many Reversals But It Was Not A Reversal, March 18, 2019
Google March 2019 Core Update Myth Busting From Google, March 19, 2019
Google Search Algorithm Update Fluctuations From March 20th to 22nd, March 25, 2019
Revealing The Google March 2019 Core Update Survey Results, March 26, 2019