Tropical Storm Coming. Pull up garlic and onions?

The title says it all, really. TS Cristobal is on its way. Here in New Orleans, we could see 10 - 12" of rain. We could flood, because that's the way things work around here. Just wondering if I should go ahead and pull up my garlic and onions? I'd hate to lose them to rot if the yard floods, which it has done too many times to count. Garlic is at the stage where the bottom parts on some of the leaves are brown but they aren't falling over. Onions are looking that way, too.

Should I risk possibly losing them or pull them up now? Anyone have any advice? 

Maybe pull one and see how far along it's developed? I think they need time to split up into cloves and then time to grow enough skins to protect them. When do you usually pull them?

LBB just had a thought.

Gently & carefully dig/ fork up  up half the crop with out bruising the stems & leave as much of the roots intact as you can .   Store it high & in moist compost with the greenery still on  & exposed to the air .  Then if the TS passes without hitting you hard  replant asap  water them in well . If the gardens get flooded once the water is gone and not showing in a six inch deep hole replant and water them in again.  Don't leave them out exposed to the sun & wind  pop them in a bucket of water till you  take them to the storage area & set up the storing within an hour or so . That way you might be able to fool the plants in to thinking they are still growing .

Once replanted they may suddenly run to seed but at least you can eat them till they get well past eating stage by using them to make veg & meat stocks and strain them off once it has been cooking & cooled for a few hours. 

Whatever you do please come back to the thread and tell us what happened and what you did & your thoughts about it all , as there may be others seeking a solution to a similar problem.

 Onion freezes well when diced & laid on a tray then bagged up when fully frozen......... use it for cooking only .

 If you soften sliced onions in a bit of butter , once they go slightly translucent , let them cool on a cleaned steel tray, then     slip them into a vac pack bag & heat seal them in useable portions . I did 23 pound of onions like that , dropped them into the freezer when totally cold and a month later  used them at our annual sea angler charity meet up on the burger & hot dog stall . Some were melted in a bit of hot water and brought to a slow simmer ,  others were dumped in a big frying pan and refried till some picked up a hint of caramelisation on them . There wasn't any left overs .

Thank you, Molly and Plantoid for your great advice! I got busy with a work-related task and did not have any time to investigate and\or dig up the alliums. Fortunately for me (and unfortunately for those east of me), the track shifted and we got far less rain than originally anticipated.

The bulbs seem to be growing just as they were before, so I think all is well. I'm planning to follow your great advice next time there's a significant weather system headed my way. 

Thanks for taking the time to reply!