لما طلعت من المحطة، كان فيه مطر وهوا.

When I came out of the station, it was raining and windy.

Breakdown of لما طلعت من المحطة، كان فيه مطر وهوا.

• ال: the
• من: from
• و: and
• فيه: there is

Questions & Answers about لما طلعت من المحطة، كان فيه مطر وهوا.

What does لما mean here?

Here لما means when.

It introduces a time clause: لما طلعت من المحطة = when I came out of the station.

In Egyptian Arabic, لما is very common for talking about something that happened and what was happening at that time. Depending on context, it can sometimes feel like when, once, or after, but in this sentence when is the most natural meaning.

Why is there no separate word for I in طلعت?

Because the verb already includes the subject.

طلعت means I went out / I came out / I left, and the ending -ت shows I in the past tense.

So Egyptian Arabic often does not need a separate subject pronoun unless you want extra emphasis.
You could say أنا طلعت for emphasis, but normally just طلعت is enough.

Does طلعت literally mean came out, went up, or left?

All of those are possible in different contexts.

The verb طلع has a broad range of meanings, including:

• go up
• come out
• appear
• leave / head out

In this sentence, because it is followed by من المحطة meaning from the station, the natural sense is came out of or left the station.

So طلعت من المحطة is best understood as I came out of the station.