greetings and hello Larry H - hope you are well
#1 - strong uptrends by $SPX or by SPY price action are characterized by MULTIPLE tags
of the upper BB on the daily, weekly and monthly charts -- got it? this is number 1 priority if you
want to correctly interpret what the meaning and application is for comparing where price is located relative
to a specific index or ETF Bollinger Band.
#2 - the reverse for strong down trends by price
#3 - I strongly recommend you always plot for your own trading reliability the entire tool set on each chart:
BB
BB width
%B
read Bollinger on Bollinger Bands written some years ago by John A. Bollinger ..an autographed copy costs nothing additional
if you contact his admin team in California and request such. You can tell them that hiker sent you, if you like. Bollinger Capital Management
can be your search term for locating their phone number and email address. Friendly and responsive folks.
Please ignore nearly all the literature by other authors about the interpretation of BB's. It is 95% dead incorrect, and is misleading.
any other questions?