In Spanish, one of the impersonal expressions we use to talk about the weather is hay:
Hoy hay tormenta.There is a storm today.
Hay relámpagos.There is lightning.
Hay truenos.There is thunder.
There are some other phrases which use está:
El cielo está despejado.There are clear skies.
Está soleado.It is sunny.
Bear in mind that hay will be followed by a noun, while está will be followed by an adjective.
Hay truenos (truenos = thunder [noun])
Está soleado (soleado = sunny [adjective])
There are also phrases which can use either está or an impersonal verb:
Está lloviendo.It is raining.
Está nevando.It is snowing.
For other expressions to talk about the weather see also:
Using hace to talk about the weather
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