Errors in the Large Hail Parameter (LHP) calculation

[dustwx28]

Regarding the Large Hail Parameter (LHP) calculation:

I submit the following corrections to SHARPpy for the LHP calculation in params.py based on communication with A. Johnson NWS:

1. Kelliecook has already submitted this first issue as “lhp calculation error lhp calculation error #220” on 2 September 2021:
   Lines
   455 if term_a < 0:
   456 term_a = 0
   and lines
   474 if term_b < 0:
   475 term_b = 0

It should be:
If term_a < 0 AND term_b < 0 then LHP = 0

Additionally:
2) Lines 464 and 465
464 If grw_alpha_el > 180:
465 grw_alpha_el = -10

Instead it should be:
If grw_alpha_el > 180
Then the entirety of the term, (grw_alpha_el + 5)/20 = -10 in line 472

and lastly:
3) after line 477 lhp = term_a * term_b + 5
Check again that LHP is NOT < 0 to avoid ever having a negative LHP. If lhp < 0 at this point, set lhp = 0.