LS OR LOC RWY 13, AMDT 10...
ILS OR LOC RWY 31, AMDT 24...
ILS OR LOC RWY 5, AMDT 1...
VOR RWY 23, ORIG-B...
ILS RWY 31 (SA CAT I), AMDT 24...
ILS RWY 31 (CAT II AND III), AMDT 24...
All of these NOTAMS mean that an Aeronautical information publication (AIP) has changed recently and they havent had the time to update the actual chart yet. Located here:
Aeronautical Information Publication - AIP
These could have amendments for many different situations such as a recent Flight Check was done at the airport to raise minimums, a tree was cut down to lower minumums, a new AGIS survey was flown to give better minimums or lower minimums for a certain runway, etc.
BUT with the alternate NA mins directly below these certain RWY's, the means the Alternate Minimums are NA for these runways. Here is PDF example of what these would look like as notification to airports or for part 91 pilots on a website like AirNav:
https://download.aopa.org/ustprocs/current/NE-1/mmk_alternate_minimums.pdf
Just like the PDF states
NA - means alternate minimums are not authorized due to unmonitored facility, absence of weather reporting service, or lack of adequate navigation coverage.
So if your question of today as to whether you should use DSM as an alternate perhaps (based upon my OpSpecs for rwys I can use), the answer would be yes and no. Since 5/23 is CLSD and RWY 13/31 has altn mins NA listed above, you would assume no. HOWEVER based upon my companies IAP Charts, I am allowed to use RNAV (GPS) RWY 13 which as you can see is not listed above in the NOTAMS. I would just have to add 400ft to DH and 1sm to visibility because per the chart, it does not use the DSM VORTAC and I have to add the 1 NavAid Rule to my GPS approaches for alternates per my C055's.
Anytime you see NOTAMS just like you posted, read it like this:
FDC 0/6923(A1573/20) - IAP DES MOINES INTL, DES MOINES, IA.
ILS OR LOC RWY 13, AMDT 10...
ILS OR LOC RWY 31, AMDT 24...
ILS OR LOC RWY 5, AMDT 1...
VOR RWY 23, ORIG-B...
ILS RWY 31 (SA CAT I), AMDT 24...
ILS RWY 31 (CAT II AND III), AMDT 24...
Your thoughts "Okay so something has changed on the Instrument Approach Procedures plate/chart. What change did they make that I care about?"
Answer: ALTERNATE MINIMUMS NA
Your thoughts "Okay so what made the rwys alternate mins go NA?"
Answer: the DSM VORTAC is UNMONITORED. From 27 APR 14:18 2020 UNTIL 27 MAY 14:18 2020 ESTIMATED.
All answers will be different per everyone's different OpSpecs and A012's. There are loopholes for every situation BUT just know how to read it for flight planning and legality purposes.