Breakdown of هو قرأ نشرة الطقس، لعل المطر شديد.
الal
the
هوhuwa
he / his / him (attached)
قرأqara'a
to read
مطرmatar
rain
Questions & Answers about هو قرأ نشرة الطقس، لعل المطر شديد.
How does the word لعل affect the grammar of the word المطر (the rain)?
لعل (perhaps) belongs to a group of words known as the "sisters of Inna". Just like إنّ (indeed), it forces the noun immediately following it to take the accusative case. If we read it with full vowels, it is لعل المطرَ (la'alla al-matara) with a fatha at the end, not al-mataru.
Does لعل mean the exact same thing as ربما (maybe)?
They are similar, but لعل often carries a sense of expectation, hope, or even apprehension. While ربما is a neutral "maybe", لعل in this sentence implies "I expect the rain might be severe based on what was read in the report."
Why doesn't the word نشرة (report) have ال (the) attached to it?
Because نشرة الطقس (the weather report) is an Idafa (possessive construction), literally meaning "the report of the weather." In an Idafa, the first word never takes ال, but it is still considered definite because it is attached to the second word, which does have ال.
The verb قرأ already means "he read." Why is the pronoun هو (he) added at the beginning?
In Arabic, you can just say قرأ (he read) without the pronoun, which is the standard verb-first word order. Adding هو at the beginning is a stylistic choice that adds slight emphasis, focusing the listener's attention specifically on "him."