How to Draw Your Own Weather Forecast Maps (Without GIS Software)

The forecast maps you see from serious indie forecasters look like they require specialized software to make. Some of them do — but they don't have to.

This guide walks through exactly how to draw and publish a weather forecast map using ForecasterHQ's built-in map maker. You don't need GIS software, Photoshop, or a graphics background. You need to know your forecast and about 10 minutes.

What You're Building

A ForecasterHQ forecast map is not a static image. It's a structured, interactive map that:

Shows your forecast zones drawn on real geography
Labels each zone with precipitation type and range (e.g., "6–10 inches," "rain-snow mix")
Gets a permanent, shareable URL
Can be verified automatically against NWS observations after the event

If you want to see what the finished product looks like before we start, open this live storm forecast example in a new tab.

Step-by-Step: Drawing Your First Forecast Map

Step 1: Create Your Forecast

Log in to ForecasterHQ and click New Forecast. Before you start, make sure you've already analyzed the model data and made your forecast call — the map-drawing step comes after you know what you're predicting. (If you're still sorting out which model viewer to use for your analysis, see Best Weather Model Viewers for Indie Forecasters (2026) for a comparison of Pivotal Weather, WX Charts, Tropical Tidbits, and WeatherBELL.)

Give it a title (e.g., "Nor'easter Feb 12 — Southern New England") and set the event window: your forecast valid period start and end time.

This timestamp matters. It's what the verification engine uses to pull NWS observations after the event, so be as accurate as you'd be in a real forecast brief.

Step 2: Open the Map Canvas

Click into the Map tab of your forecast editor. You'll see an interactive basemap — OpenStreetMap base with a clean rendering, zoomable and pannable.

Navigate to your forecast region. Zoom in to the level where you can comfortably draw the zone boundaries you have in mind. For a regional snowstorm, you'll typically want to see the full state or multi-state area at once.

Step 3: Draw Your First Zone

Click the Draw Polygon tool in the toolbar (pencil icon). Then click around the perimeter of your zone, one vertex at a time. Double-click to close the polygon.

A few tips that will save you time:

Don't obsess over perfect edges. Your forecast uncertainty is real — your polygon boundaries reflect that. A line that's 10 miles off is within the margin of normal forecast error for most events.
Use county lines and geographic features as guides. Rivers, ridgelines, and major interstates are natural zone boundaries that your audience already understands.
Draw your highest-confidence zones first. Start with the heavy-snow core you're most certain about, then work outward.

Step 4: Label the Zone and Set the Range

After closing the polygon, a settings panel opens on the right. Here's where the structured data goes:

Zone label — What you'd call this zone in your forecast text: "Heavy snow zone," "Mix zone," "Mainly rain," etc.

Precipitation type — Snow, rain, mix, ice. Selecting this determines the color the zone renders in (blue for snow, green for rain, etc. — you can customize the palette).

Accumulation range — Enter a low and high value (e.g., 6 and 10 for a 6–10" range). This is stored as structured data, not just display text. It's what makes verification possible.

Confidence level — Optional but useful. High, medium, or low confidence. Displayed subtly on the map and in the forecast detail view.

Click Save Zone.

Step 5: Add More Zones

Repeat the draw-and-label process for each zone in your forecast. Most winter storm maps have 3–5 zones:

Heavy snow core
Moderate snow zone
Mix zone (rain/snow line)
Rain zone (if applicable)
Transition or "could go either way" zone (if you want to be explicit about uncertainty)

There's no limit on the number of zones, but the maps that communicate most clearly tend to have 4–6 distinct regions. More than that and the legend gets cluttered.

Step 6: Write Your Forecast Brief

Below the map, you have a text editor for the forecast narrative. This is where you explain the setup, the key uncertainties, and your reasoning.

This doesn't have to be long — 150–300 words is typical for a storm map post. Hit the model setup, the key forecast question (where does the rain-snow line set up? how much does track matter?), and your best answer to that question.

The narrative and the map work together. The map is the visual summary; the brief is the reasoning.

Step 7: Publish

Click Publish Forecast. Your forecast gets:

A permanent URL (e.g., forecaster.hq/[your-handle]/forecasts/[forecast-id])
An embeddable iframe for your blog or website
An image snapshot for social sharing (auto-generated)
Verification status: Pending (switches to Verified after NWS obs are pulled post-event)

Copy the URL, post the share image to social, and you're done.

After the Event: Verification

This is what makes ForecasterHQ maps different from everything else.

After your event window closes, the verification engine automatically pulls NWS station observations from within your forecast area. Within a few hours of event end, your forecast status updates from Pending to Verified, and you get a breakdown:

Which stations fell within your predicted range
Which were outside (and by how much)
A hit rate for the event
An update to your running accuracy track record

Your track record is public on your profile. Over time, it becomes a meaningful part of your forecaster credibility.

If you want to understand more about how the verification scoring works, read the storm forecast verification tool page.

Common Mistakes to Avoid

Zones that don't touch. Your forecast should account for every point on the map. Leave no gray space between zones — pick a zone label for the in-between areas even if it's just "light snow (1–3 inches)."

Rain-snow line precision theater. Don't draw a razor-sharp rain-snow boundary if you're not confident in its placement. Use a wider zone or explicitly note "uncertain line placement" in your brief. Your verification score will reflect the precision you claimed.

No timestamp on the event window. The event window is what ties your forecast to the verification data. A vague date range makes the verification less meaningful.

Forgetting the embed. If you have a blog or newsletter, embed the forecast iframe rather than just posting a screenshot. Your readers get an interactive map; you get engagement data.

What a Good Map Looks Like

The live storm forecast example on ForecasterHQ shows a complete published forecast — map zones, structured data, forecast brief, and a view of what the verification output looks like post-event.

Looking for a comparison of all the tools available for making weather maps? See Best Weather Forecast Map Makers in 2026.

Draw your first forecast map — free →