לפי התחזית, צפויה רוח חזקה בלילה.

Because it agrees with רוח (wind), which is a feminine noun in Hebrew.

• רוח = feminine singular
• so the adjective/participle must also be feminine singular:
  • צפוי = masculine singular
  • צפויה = feminine singular

So צפויה רוח חזקה literally means something like a strong wind is expected, with both צפויה and חזקה matching רוח in gender and number.

For the same reason: חזקה describes רוח, and Hebrew adjectives must agree with the noun they describe.

• רוח חזקה = strong wind
• רוח is feminine singular
• so חזקה is feminine singular too

Compare:

• גשם חזק = strong rain (גשם is masculine)
• רוח חזקה = strong wind (רוח is feminine)

Here צפויה means expected, forecast, or likely.

It comes from the root related to expecting / anticipating / foreseeing. In weather Hebrew, this word is very common.

So:

• צפויה רוח חזקה = strong wind is expected
• צפוי גשם = rain is expected
• צפויות סופות = storms are expected

Even though it looks like an adjective, in sentences like this it often functions like is expected in English.

לפי means according to.

So:

• לפי = according to
• התחזית = the forecast

Together:

• לפי התחזית = according to the forecast

This phrase sets the context before the main statement:

• According to the forecast, strong wind is expected at night.

Starting with this phrase is very natural in Hebrew, just as in English.

תחזית means forecast.

The prefix ה־ is the Hebrew definite article, meaning the.

So:

• תחזית = forecast
• התחזית = the forecast

In this sentence, it is a specific forecast, so Hebrew uses the:

• לפי התחזית = according to the forecast

Hebrew often allows more than one word order, but צפויה רוח חזקה is a very natural style in formal or forecast language.

This structure is common in news and weather reports:

• צפוי גשם
• צפויה ירידה בטמפרטורות
• צפויות רוחות חזקות

It has a slightly more formal, report-like tone than everyday conversational wording.

You could also hear:

• רוח חזקה צפויה בלילה

That is also grammatical, but the original sounds especially natural in a forecast.

בלילה means at night or during the night.

It is made of:

• ב־ = in / at
• לילה = night

So:

• בלילה = at night

Depending on context, it can mean:

• tonight at night
• during the nighttime
• in the night hours

In this sentence, it means that the strong wind is expected during the night.

In present-tense Hebrew, the verb to be is usually omitted.

So Hebrew often says literally:

• צפויה רוח חזקה בלילה
• word-for-word: expected strong wind at night

But in natural English, we translate it as:

• A strong wind is expected at night.

This is a very normal feature of Hebrew, not something unusual about this sentence.

In modern Hebrew, רוח is generally treated as feminine, especially in everyday speech and standard modern usage.

So you will usually see:

• רוח חזקה
• הרוח חזקה
• צפויה רוח

In some older or literary contexts, you may occasionally see masculine agreement, but for a learner, the safe and standard choice is to treat רוח as feminine.

A very literal breakdown would be:

• לפי = according to
• התחזית = the forecast
• צפויה = expected
• רוח = wind
• חזקה = strong
• בלילה = at night

So a literal order would be:

• According to the forecast, expected strong wind at night.

But natural English needs:

• According to the forecast, strong wind is expected at night. or
• According to the forecast, a strong wind is expected overnight.

Both are possible, but they mean slightly different things:

• רוח חזקה = a strong wind / strong wind
• רוחות חזקות = strong winds

The singular can describe a general weather condition, not just one single gust. Weather Hebrew often uses either singular or plural depending on how the forecast is phrased.

So the original sentence is completely natural:

• צפויה רוח חזקה בלילה = strong wind is expected at night

If the forecast wanted to emphasize multiple winds/gusts, it might say:

• צפויות רוחות חזקות בלילה

Yes, it sounds a bit formal and very typical of weather forecasts, news reports, and official announcements.

In casual conversation, someone might say something a little more everyday, such as:

• תהיה רוח חזקה בלילה = there will be strong wind at night

But in forecast style, צפויה רוח חזקה בלילה is very natural and standard.