Hurricane Delta Has Rapidly Strengthened And Is Now At Category 4

From the National Hurricane Center:

Hurricane Delta Update Statement

Hurricane Delta Tropical Cyclone Update
NWS National Hurricane Center Miami FL       AL262020
1120 AM EDT Tue Oct 06 2020

...RECENTLY RECEIVED DATA FROM A NOAA HURRICANE HUNTER AIRCRAFT 
INDICATE THAT DELTA HAS RAPIDLY STRENGTHENED INTO A CATEGORY 4 
HURRICANE...

Data from a NOAA Hurricane Hunter aircraft indicate that Delta is 
continuing to rapidly strengthen. The maximum winds have 
increased to near 130 mph (215 km/h) with higher gusts.  This makes 
Delta a category 4 hurricane on the Saffir-Simpson Hurricane Wind 
Scale....

And keeping in mind that the right-front quadrant of these storms is the most dangerous:
NHC