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I my last post to you, I said "Amps/square meter" when I meant Watts (power delivered) per square meter... not enough coffee this time in the morning. -

Which is probably why you wrote "I don't know how any of my electronics will fair... when I'm sure you meant "how my electronics will fare.."

That's fair. I think of W/m2 as a value of radiated power, dependent on the frequency. Since a very short pulse has a very wide frequency spectrum, I think radiated power may be useful for some but not all types of antennas like this: https://www.tutorialspoint.com/antenna_theory/antenna_theory_quick_guide.htm

But if you want to know how much power actually makes it into the device you use this formula: https://www.ahsystems.com/EMC-formulas-equations/field-intensity-calculation.php to calculate field strength and then the radiated power is proportional to that.

I entered a zero dB antenna and 30,000 meters altitude. With a trillion Watts I got 182 V/m and 88 W/m2. That's with the impedance implied in the formula which will depend on the materials of the receiver and the frequency spectrum. That seems like enough to do a little damage, not a lot of damage.

Also see: http://www.futurescience.com/emp/E1-E2-E3.html. Given the type of pulse, e.g. E1, the electric field strength and power density are related and proportional: These 2 MEV gamma rays will normally produce an E1 pulse near ground level at moderately high latitudes that peaks at about 50,000 volts per meter. This is a peak power density of 6.6 megawatts per square meter.