אני לא מתכוונת לצאת בלי מטרייה אם לפי התחזית תהיה סערה.

Because the speaker is female.
In Hebrew, the present-tense participle used after אני changes for gender:

• אני מתכוון = I intend / I mean to... (male speaker)
• אני מתכוונת = I intend / I mean to... (female speaker)

So this sentence is being said by a woman or girl.

The core pattern is:

אני + מתכוונת + infinitive

Here, the infinitive is לצאת = to go out / to leave.

So:

• אני מתכוונת לצאת = I intend to go out
• אני לא מתכוונת לצאת = I do not intend to go out

This is a very common Hebrew structure for expressing intention.

Yes, but the meaning shifts slightly.

• אני לא מתכוונת לצאת... = I do not intend / I am not planning to go out...
• אני לא אצא... = I will not go out...

The version with מתכוונת emphasizes intention or plan.
The version with future tense (אצא) sounds more direct and definite.

So both can work, but מתכוונת adds the nuance of personal intention.

Because it follows מתכוונת. After verbs or expressions of intention, desire, ability, and so on, Hebrew often uses the infinitive with ל־.

Examples:

• אני רוצה ללכת = I want to go
• אני יכולה לבוא = I can come
• אני מתכוונת לצאת = I intend to go out

So לצאת is exactly what you would expect here.

בלי means without.

So:

• בלי מטרייה = without an umbrella

Hebrew does not need any extra word like English a/an.
A bare noun can be indefinite.

Compare:

• מטרייה = an umbrella / umbrella
• המטרייה = the umbrella

So בלי מטרייה naturally means without an umbrella, not without the umbrella.

Because the sentence means without an umbrella, not without the umbrella.

In Hebrew, the definite article is attached to the noun:

• מטרייה = an umbrella
• המטרייה = the umbrella

So:

• בלי מטרייה = without an umbrella
• בלי המטרייה = without the umbrella

Both are possible, but they mean different things.

Here it means if.

Hebrew אם can introduce a condition, just like English if:

• אם תהיה סערה = if there is / if there will be a storm

In other contexts, אם can also mean whether, but in this sentence it is clearly conditional.

לפי התחזית means according to the forecast.

Hebrew allows some flexibility in word order, and this phrase is inserted before תהיה סערה to frame the condition:

אם לפי התחזית תהיה סערה
= if, according to the forecast, there will be a storm

This is natural Hebrew. It highlights that the condition is based on what the forecast says.

You could also hear slightly different wordings, such as:

• אם תהיה סערה לפי התחזית
• אם לפי תחזית מזג האוויר תהיה סערה

But the original sentence is perfectly normal.

Because סערה is a feminine noun.

In Hebrew, the future form of to be / happen / occur agrees with the gender of the noun:

• יהיה = will be (masculine singular)
• תהיה = will be (feminine singular)

Since סערה is feminine, Hebrew says:

• תהיה סערה = there will be a storm

Compare:

• יהיה גשם = there will be rain (masculine noun)
• תהיה רוח חזקה = there will be strong wind (feminine noun phrase headed by *רוח)*

Hebrew often expresses there is / there will be differently from English.

In the future, Hebrew commonly uses forms of היה:

• תהיה סערה literally: will be a storm
• natural English: there will be a storm

So even though English uses there will be, Hebrew does not need a separate word for there in this kind of sentence.

Both are possible.

• התחזית = the forecast
• תחזית מזג האוויר = the weather forecast

In context, התחזית usually already implies the weather forecast, so the shorter form sounds natural.

סערה is a general word for storm.
Its exact sense depends on context: windstorm, major storm, stormy weather, etc.

So in a weather sentence like this, it usually means a storm or severe stormy conditions.

Because Hebrew is combining two different ideas:

1. present intention: אני לא מתכוונת = I do not intend
2. future event: תהיה סערה = there will be a storm

So the speaker’s intention exists now, while the storm is in the future.
That is why the first part is in the present-form expression מתכוונת, and the second part uses future tense תהיה.

Yes. לצאת has a range of meanings depending on context, including:

• to go out
• to leave
• to go outside

In this sentence, because of בלי מטרייה and the weather context, it most naturally suggests going out / going outside.

It breaks down like this:

• אני = I
• לא מתכוונת = do not intend
• לצאת = to go out
• בלי מטרייה = without an umbrella
• אם = if
• לפי התחזית = according to the forecast
• תהיה סערה = there will be a storm

So the pattern is:

main clause + conditional clause

More specifically:

I do not intend to go out without an umbrella

• if according to the forecast there will be a storm

That is a very normal Hebrew sentence pattern.