---
title: "Sep 23rd AM Update: Two Invests to Watch in the Tropics"
description: Fall is here but the Atlantic Hurricane season has decided to awaken from its midseason slumber.
image: https://www.getweatherstem.com/hubfs/37407140.gif
---

On The Radar with Jess

# Sep 23rd AM Update: Two Invests to Watch in the Tropics

![Jessica Arnoldy](https://www.getweatherstem.com/hubfs/Website%20Images/jess.jpg) Jessica Arnoldy

September 23, 2025

[On the Radar with Jess](https://www.getweatherstem.com/blog/tag/on-the-radar-with-jess) 

![](https://www.getweatherstem.com/hs-fs/hubfs/37407140.gif?width=1050&height=520&name=37407140.gif)

Tuesday morning brought the naming of two invests in the Atlantic Ocean, both 93L and 94L: 

![Screenshot 2025-09-23 at 8.34.41 AM](https://www.getweatherstem.com/hs-fs/hubfs/Screenshot%202025-09-23%20at%208.34.41%20AM.png?width=643&height=381&name=Screenshot%202025-09-23%20at%208.34.41%20AM.png)

Declaring an area to watch an invest allows more model guidance to be gathered on each system, giving meteorologists more information to make better forecasts. Both invests look good on satellite with a decent amount of storm activity:

![37407140](https://www.getweatherstem.com/hs-fs/hubfs/37407140.gif?width=1050&height=520&name=37407140.gif)

There isn't a lot of new information from yesterday's post. A few different scenarios could happen. One, the two systems could combine into one system like the latest operational GFS wants to do. The image below is valid Sunday Evening:

![image](https://www.getweatherstem.com/hs-fs/hubfs/image.png?width=689&height=566&name=image.png)Another scenario being forecasted is that each invest develops and approaches the Eastern coast of the US, with the invest further west (94L) having a higher chance of bringing impacts to the country. This scenario is being depicted by the Euro (both its operation and ensembles), the Google AI model and the GFS ensembles:

EURO Operational:

![Euro Operation Valid Sunday Evening](https://www.getweatherstem.com/hs-fs/hubfs/image%20(1).png?width=689&height=566&name=image%20(1).png)

EURO Ensemble

![Image 14-2](https://www.getweatherstem.com/hs-fs/hubfs/Image%2014-2.jpeg?width=648&height=451&name=Image%2014-2.jpeg)

Google AI

![image (2)](https://www.getweatherstem.com/hs-fs/hubfs/image%20(2).png?width=648&height=451&name=image%20(2).png)

We will post a new blog this afternoon with the latest model updates. Once we have a clearer picture on what will play out, we can start discussing potential impacts. That may have to wait until later in the week as this is a more complicated situation than normal with two potential systems. The next two names on the list are Humberto and Imelda. 

 

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![Jessica Arnoldy, Director of Meteorology Services at Weatherstem](https://www.getweatherstem.com/hubfs/Website%20Images/jess.jpg)

Jessica Arnoldy

Director, Content and Meteorology Services

Jessica brings nearly two decades of broadcast and operational meteorology experience to Weatherstem. She spent 19.5 years as a senior meteorologist at The Weather Channel and holds a BS from Georgia Tech and MS from Penn State. She writes On The Radar to help emergency managers, athletic directors, and operations teams understand what severe weather means for their specific situations.

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