Sleet Storm - concentration question

[Specter]

So, the spell says:

"If a creature is concentrating in the spell’s area, the creature must make a successful Constitution saving throw against your spell save DC or lose concentration."

When/How often does this save occur? Immediately when you cast it? Every turn? Every round? In the creature's turn?

[DivisibleByZero]

I'd rule that it happens immediately upon casting, and then again at the beginning of each of its turns as long as it remains in the area. Or maybe immediately upon casting, and then again on each of your turns.
Yeah, I like the second one better.

[hymer]

I'd have it be when the Dex save to avoid going prone is made: When a creature starts its turn in the aoE or enters it for the first time that turn.

[Coffee_Dragon]

To me it seems clear that "When a creature enters the spell's area for the first time on a turn or starts its turn there" also applies for the concentration dealie.

[Plaguescarred]

So, the spell says:

"If a creature is concentrating in the spell’s area, the creature must make a successful Constitution saving throw against your spell save DC or lose concentration."

When/How often does this save occur? Immediately when you cast it? Every turn? Every round? In the creature's turn?I'd say only once. The effect is either too turbulent and break your concentration or it isn't and you manage to keep your concentration while enduring it.

[Deleted]

So, the spell says:

"If a creature is concentrating in the spell’s area, the creature must make a successful Constitution saving throw against your spell save DC or lose concentration."

When/How often does this save occur? Immediately when you cast it? Every turn? Every round? In the creature's turn?

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Effect

Until the spell ends, freezing rain and sleet fall in a 20-foot-tall cylinder with a 40-foot radius centered on a point you choose within range. The area is heavily obscured, and exposed flames in the area are doused.

The ground in the area is covered with slick ice, making it difficult terrain. When a creature enters the spell’s area for the first time on a turn or starts its turn there, it must make a Dexterity saving throw. On a failed save, it falls prone.

If a creature is concentrating in the spell’s area, the creature must make a successful Constitution saving throw against your spell save DC or lose concentration.

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Concentration

Some spells require you to maintain concentration in order to keep their magic active. If you lose concentration, such a spell ends.

If a spell must be maintained with concentration, that fact appears in its Duration entry, and the spell specifies how long you can concentrate on it. You can end concentration at any time (no action required).

Normal activity, such as moving and attacking, doesn’t interfere with concentration. The following factors can break concentration:

Casting another spell that requires concentration. You lose concentration on a spell if you cast another spell that requires concentration. You can’t concentrate on two spells at once.
Taking damage. Whenever you take damage while you are concentrating on a spell, you must make a Constitution saving throw to maintain your concentration. The DC equals 10 or half the damage you take, whichever number is higher. If you take damage from multiple sources, such as an arrow and a dragon’s breath, you make a separate saving throw for each source of damage.
Being incapacitated or killed. You lose concentration on a spell if you are incapacitated or if you die.

The GM might also decide that certain environmental phenomena, such as a wave crashing over you while you’re on a storm-tossed ship, require you to succeed on a DC 10 Constitution saving throw to maintain concentration on a spell.
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Each round the sleet storm (freezing rain and sleet) is falling into you. You would need a concentration check at the start of your turn to continue concentrating on a spell.

Just like if you get hit by multiple attacks, you need multiple concentration checks. Each round would be a new check, to make it simple just do it on the creature's turn, but before they take their turn.