Hurricane season remains very active in the Pacific, with two hurricanes, Polo and Nolo, and Tropical Storm Rachel. There is also another area in the Pacific that we are monitoring for development in the days ahead.

Activity is much lower in the Atlantic, where Fay is hanging on while fighting hostile conditions from an intensifying El Niño plus newly formed Tropical Storm Hanna, both of which will stay out to sea.

We have the maps you need to track all these systems below, starting with the most active basin, the Central and Eastern Pacific.

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Tracking the Pacific

Hurricane Nolo

Nolo rapidly intensified on Monday and is still a major hurricane, passing south of Hawaii.

Polo forecasts

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Polo made landfall as a strong Category 2 hurricane in Mexico's Baja California Sur at 11pm MST on Monday.

Moisture from Polo is forecast to be drawn into the Southwest U.S., fueling thunderstorms with flooding rain this week.

Hurricane alerts are in effect for parts of the Pacific coast of the Baja Peninsula north of Los Cabos.

The forecast track and latest information on Tropical Storm Rachel is also shown in the map below. Rachel is not expected to threaten land directly at this time.

Rainfall forecast

The map below shows where the heaviest rain from Polo may fall over the next five days in Mexico and the U.S., along with the latest National Hurricane Center forecast cone in black. You can see moisture from Polo work its way into the southwestern U.S. over the next few days, which could trigger significant flooding.

Sea surface temperatures

Along with ocean temperatures, this map also shows another area the National Hurricane Center is monitoring for possible tropical development.

The next Eastern Pacific tropical storm will be named "Simon."

Pacific tracks so far this season

Tracking the Atlantic

Sea surface temperatures

Fay may stubbornly hold on far from land over the central Atlantic Ocean.

Hanna has also formed to the north of Fay.

You can see the active systems on the sea surface temperatures map below.

Wind shear

These are areas of strong wind shear, the difference in wind speed and direction with height, which are shown in purple. High wind shear is hostile to mature tropical cyclones and those trying to develop.

(MORE: What is wind shear?)

Dry, dusty air

Another nemesis of tropical systems is dry air.

In hurricane season, plumes of dust-laden air stream across the basin from Africa's Sahara Desert, as you can see in the map below. This sinking, dry air squelches thunderstorm development, the building blocks of tropical storms and hurricanes.

So areas in the brown shading below are generally unfavorable for development.

Atlantic tracks so far this season

These are the tracks of systems that were at least tropical or subtropical storms, so far in the Atlantic Basin.

Season activity compared to average

Accumulated Cyclone Energy, or ACE, is a metric that measures the total energy produced by tropical storms and hurricanes over a given period, accounting for both how strong they were and how long they lasted.

It's another measure meteorologists use to gauge how active a hurricane season has been.

As you can see below, it has been a historically quiet Atlantic season, while the Pacific — especially the Eastern Pacific — has been much more active than usual.

(MORE: Complete El Niño coverage)