A short introduction and advice:

Contrails - chemtrails aka contrail-cirrus
The last word being a term used by scientists.
I have come to the conclusion that cirrus made via heterogeneous ice nucleation are most likely man-made clouds via upper atmosphere spraying of man-made cloud creating aerosols.
Homogeneous ice nucleation is ( or was, before geoengineering ) more prevalent than heterogeneous ice nucleation and are more likely natural.
This is not anymore the case thanks to geoengineering.
Wat RH and temperature is needed for cirrus to grow, spread and persist is known.
If the conditions are met for natural cirrus ( homogeneous ice nucleation ) or ( mostly ) man-made heterogeneous ice nucleation,
you can check out via your nearest upper air observation station.
See the 4 tables here....
Checkout your nearest observation station here....
What does "Z" mean in the title?
"Z" means UTC and UTC is the same as Greenwich time in the Winter. To know UTC time in the Summer or Winter check Icelandic time or just always use Icelandic time.
This page I didn't wrote just for myself but for us. You and me.
In order for us to communicate and me being able to give yo advice or for me to be able to checkout the cirrus pictures of yours,
I need the following:
What time zone are you living in, what state, what s your closest upper air observation station?
When did you take your pictures?
Please, UTC ( Iceland ) time only.
I live in Finland. My time zone is UTC +2 hours in the Winter and + 3 hours in the Summer.
My closest upper air observation station is 80km to the East: Jokionen.

Go here http://www.timeanddate.com/time/map/ for a user active map. When you go with your mouse over a red dot, it will tell you the time of the particular town:
Instead of me trying to figure out your nearest upper air observation station, I think it's better you do it yourself.
Here is a page will all the states of the USA and it lists all the stations for every state: https://www.ametsoc.org/amsedu/dstreme/images/upa_sta.html
Example: Under AL you'll find:
------- ALABAMA ------- 
Use google map to find out which station is the closest to you. It might also be that the station of another state is closer to you.
Back to "Z" time

Weather observations around the world (including surface, radar, and other observations) are always taken with respect to a standard time. By convention, the world's weather communities use a twenty four hour clock, similar to "military" time based on the 0 longitude meridian, also known as the Greenwich meridian.

Prior to 1972, this time was called Greenwich Mean Time (GMT) but is now referred to as Coordinated Universal Time or Universal Time Coordinated (UTC). It is a coordinated time scale, maintained by the Bureau International des Poids et Mesures (BIPM). It is also known a "Z time" or "Zulu Time".

To obtain your local time here in the United States, you need to subtract a certain number of hours from UTC depending on how many time zones you are away from Greenwich (England). The table below shows the standard difference from UTC time to local time.

The switch to daylight saving time does not affect UTC. It refers to time on the zero or Greenwich meridian, which is not adjusted to reflect changes either to or from Daylight Saving Time.

However, you need to know what happens during daylight saving time in the United States. In short, the local time is advanced one hour during daylight saving time. As an example, the Eastern Time zone difference from UTC is -4 hours during daylight saving time rather than -5 hours as it is during standard time. 

Another possibility here: http://dimitrxe.pp.fi/pub/Boras/home%20page/frame/worldtime.html

This is my time zone. http://alien-homepage.de/weather_start/current_site_template_%20expl_english/weathersite%20general%20template/timezones/gmt+2.html
Which is yours?
I live in Finland which is UTC +2 hours in the Winter and + 3 hours in the Summer.
When my nearest upper air station shows 02963 Jokioinen Observations at 00Z 06 Mar 2014 in the Winter, local time is 2 AM in the Winter and 3 AM in the Summer
When it shows 02963 Jokioinen Observations at 12Z 05 Mar 2014, local time ( + 2 hours ) it's 2PM in the Winter and 3PM in the Summer.
I for my part have set my camera's time stamp to UTC time on March 5 2014.
Flightradar24 Flightradar24.com - Live flight tracker! is only using UTC time as do the upper air observation stations: Atmospheric Soundings
Now it gets more tricky because:
A: You don't live exactly next to your closest upper air observation station and... you took your pictures a few hors before or after the upper air data was taken.
The easiest way is through statistics.
Upper air measurements are usually uploaded twice per day. At 12:00 UTC and UTC 00:00
Collect the data of an entire month.
Write down when the Relative Humidity (RH) was high enough for forming "natural cirrus"
When the RH was high enough for "heterogeneous ice nucleation"
When it was high enough for "persistent-spreading-contrail"
When it was high enough for "persistent but not spreading contrails"
When it was to low for persistent contrails (frost point )
Do your math. I did.
The RH was to seldom high enough for " natural cirrus " and it should be at least one to one ( homogeneous versus heterogeneous ice nucleation.
Remember also that even if it's cold and humid enough, cirrus or contrail-cirrus will not form at least 30% of the time because the up-drift winds ain't right.
I also noticed that on to many days when it was far to dry we had contrail-cirrus.
To the argument: " humidity can change within a few hours " I say: True. That's why I use statistics and humidity can change both ways. Up or down.
So when your data tells you, you should have seen on 12 days that month ( because of sufficient humidity ) cirrus clouds, it's actually on 9 days ( 30% of the time the up-drift winds ain't right )
So, on 9 days but add an extra day ( 10 days ) because of shifting humidities.
Should you see cirrus or contrail-cirrus for example on 15 days or more, you know it's geoengineering.
Should you see cirrus created via heterogeneous ice nucleation 2,3,4 or 5 times more often than cirrus created via homogeneous ice nucleation ( should be 1:1 )
You know it's geoengineering
Should it be way to dry for persistent-contrails ( 10% lower humidity or more ) see the frost point as shown in the yellow table.
I hope you understand what I'm talking about but the best way to learn something is to do it.
Ask any questions if there is something unclear.

Choose the month and from -- to. Click on station on the map or insert your upper air station number. My station is: 02963

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