Det er risikabelt å kjøre i stormen.

Because Norwegian often uses det as a dummy subject in sentences like this, just like English uses it in It is risky to drive in the storm.

So:

• Det er risikabelt å kjøre i stormen. = It is risky to drive in the storm.

The real idea is in the infinitive phrase å kjøre i stormen, but Norwegian often places that later in the sentence and starts with det er.

You can also say:

• Å kjøre i stormen er risikabelt.

That is also correct, but Det er ... å ... is very common and often sounds more natural in everyday speech.

Because the adjective is in its neuter singular form: risikabelt.

The basic forms are:

• en risikabel plan
• et risikabelt valg
• risikable situasjoner

In a sentence like Det er risikabelt å kjøre i stormen, Norwegian normally uses the neuter form of the adjective after det er when the adjective describes an action or whole situation.

So:

• Det er farlig
• Det er vanskelig
• Det er risikabelt

This is very common with adjectives used in general statements.

Å is the infinitive marker, like English to in to drive.

So:

• å kjøre = to drive

In Norwegian dictionary form, verbs are usually given with å:

• å være = to be
• å spise = to eat
• å kjøre = to drive

Here, å kjøre i stormen is the infinitive phrase meaning to drive in the storm.

Because after å, Norwegian uses the infinitive, not a finite present-tense form.

Compare:

• Jeg kjører. = I drive / I am driving.
• å kjøre = to drive

So in this sentence:

• Det er risikabelt å kjøre i stormen.

the main finite verb is er, and å kjøre stays in the infinitive.

It literally means in the storm, but in natural English it is often understood as in the storm / during the storm / in stormy conditions, depending on context.

So i does not always have to be translated word-for-word as only in. It often covers the general setting or situation.

Here, i stormen tells you the conditions under which the driving happens.

Stormen is the definite form: the storm.
En storm is the indefinite form: a storm.

So:

• i stormen = in the storm
• i en storm = in a storm

Using stormen can suggest a more specific storm, or it can simply sound natural when talking about the storm conditions being discussed.

Both are possible in Norwegian, but they give slightly different nuances:

• Det er risikabelt å kjøre i stormen.
  More like in the storm / in the storm we are talking about.

• Det er risikabelt å kjøre i en storm.
  More general: in a storm.

Yes, absolutely.

Both are correct:

• Det er risikabelt å kjøre i stormen.
• Å kjøre i stormen er risikabelt.

The difference is mainly one of style and focus.

• Det er risikabelt å kjøre i stormen is very natural and common.
• Å kjøre i stormen er risikabelt puts more direct focus on the action å kjøre i stormen.

English works similarly:

• It is risky to drive in the storm.
• Driving in the storm is risky.

No. In this sentence, det does not refer to a thing, object, or earlier noun.

It is just a formal subject or dummy subject, used because Norwegian grammar normally wants a subject in the sentence.

So this det works like English it in:

• It is important to sleep
• It is dangerous to swim here
• It is risky to drive in the storm

You should not try to find a concrete thing that det stands for here.

Risikabelt is correct and natural, but it is slightly more formal or analytical than farlig.

Compare:

• Det er risikabelt å kjøre i stormen. = It is risky to drive in the storm.
• Det er farlig å kjøre i stormen. = It is dangerous to drive in the storm.

The difference is similar to English:

• risky suggests a significant chance of danger or bad consequences
• dangerous sounds stronger and more direct

So risikabelt is a good word, but in everyday speech many speakers might also choose farlig depending on the tone they want.

Not always.

Kjøre often means to drive, but it can also be used more broadly for operating or traveling by vehicle, depending on context.

Examples:

• kjøre bil = drive a car
• kjøre buss = drive a bus
• kjøre tog = drive/operate a train

In your sentence, without another object, å kjøre i stormen will usually be understood as to drive in general, often by car unless context suggests something else.

So yes, drive is the right meaning here, but the verb itself is not limited only to cars.