The information is available, but you must pay for it.
The publication is called Storm Data and it will list all the storms and details including an estimate of crop damage. Here is the link for it and it includes a sample copy that you can download.
http://www7.ncdc.noaa.gov/IPS/sd/sd.html#SAMPLESHowever, the data is also available through the online through the following link for free
http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwEvent~StormsHowever, it is not as user friendly as the having a hard copy of Storm Data.
First, it has a limitation of how much you can search.
I will give you a sample run through so you will now how to use this database.
Let say we want to find the crop damage from all the tornado events in 1994.
http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwEvent~StormsGo to the link above. Select "all" for states, then hit "enter"
On the next menu, chang the date to 01/01/1994 to 12/31/1994
Select "Tornado" for event type
Leave everything else as is and just hit the "list storm" button.
You will then get a list of each tornado event for 1994.
(Please note that in some years, there is just too many storms for this program to list, so you will have input a shorter search time period.)
Under "CrD" is the estimated crop damage.
You can get more details of each event by clicking on the event name on the list.
To get the annual amount, you will have to add all the totals yourself.
It could be a lot of work if you are looking for several years of data for the whole USA.
It may be easier to just pay for the information if you can not find another free source.
Hope this helps.
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