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See https://en.wikipedia.org/wiki/Hurricane_Maria and https://en.wikipedia.org/wiki/Hurricane_Irma for more details.  Basically 2095 are were reported killed in Puerto Rica as a result hurricane Maria, It made landfall in Puerto Rica September 22nd 2017.  It affected several islands in the Carribean.

Impact on Internet performance 

Puerto Rica

Below is seen a time series of the RTTs from SLAC to a target host in Puerto Rica starting September 1st, 2017 and ending October  31st 2017. This was the only target site in Puerto Rica being monitored by PingER at the time.The blue line shows the losses. It is seen that there is a several day outage (100% packet loss) starting just after midnight September 19th 2017 and ending at about 8:00pm October 9th 2017. There are more outages following this with stability being achieved on November 13th, 2017. The 100% loss starting late September 8th may be partly due to hurricane Irma which passed about 60 mi (97 km) north of Puerto Rico late September 6th 2017, and the outage starting just after midnight September 19th 2019 caused by hurricane Maria.

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See http://wanmon.slac.stanford.edu/cgi-wrap/frequency.pl?monitor=pinger.slac.stanford.edu&sites=www.egrem.com.cu&begin_day=1&begin_month=8&begin_year=2017&end_day=31&end_month=10&end_year=2017&plot=time&full=false&bin_width=1&metric=&data=false

Haiti

The impact here is less clear:

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