Here is a list of useful sites for viewing forecast information and models:

• Storm Prediction Center - Severe Weather Outlooks
• Pivotal Weather - Models
• College of DuPage - Satellite Viewer
• Aviation Weather Center - Surface Observations + Reflectivity

Collaborators with the Iowa State Student Chapter of the American Meteorological Society are preparing a Forecasting How-To Page [it will be linked here as soon as possible]

If you have an account, travel to the top right side of screen (along the navigation bar), and login to your account! If you don't have an account, you can find the registration page in the same spot. Then, after you are logged in, you will see the login button be replaced by your name. If you click on your name, you will see "Submit Forecast" in the dropdown menu, that's where you can go to make your forecast!

During the forecasting season, we submit forecasts for Monday through Friday events. Forecasts are submitted between 00z - 16z. Those forecasts are scored from 1630z - 12z the next day. This matches the forecast verification period of the Storm Prediction Center's 1630z Day 1 Outlook. From this, you can see that there is no overlap between when we can submit forecasts, and when those forecasts are scored. There is overlap between the previous day's forecast verification, and when the next day's forecast period begins! This is a bit easier to understand if we use a table!

Day of the Week	Forecast Period (Zulu)	Verification Period (Zulu)
Monday	00z Mon - 16z Mon	1630z Mon - 12z Tue
Tuesday	00z Tue - 16z Tue	1630z Tue - 12z Wed
Wednesday	00z Wed - 16z Wed	1630z Wed - 12z Thu
Thursday	00z Thu - 16z Thu	1630z Thu - 12z Fri
Friday	00z Fri - 16z Fri	1630z Fri - 12z Sat

As further help, here is the same table, but in Central Time!

Day of the Week	Forecast Period (CDT)	Verification Period (CDT)
Monday	7pm Sun - 11am Mon	1130am Mon - 7am Tue
Tuesday	7pm Mon - 11am Tue	1130am Tue - 7am Wed
Wednesday	7pm Tue - 11am Wed	1130am Wed - 7am Thu
Thursday	7pm Wed - 11am Thu	1130am Thu - 7am Fri
Friday	7pm Thu - 11am Fri	1130am Fri - 7am Sat

All you have to do to amend your forecast is submit a forecast again! The system will overwrite your previous forecast as long as it is submitted before 16z. You may amend your forecast as many times as you like.

First, the easy cases:

• If you entered a city/town, the admin can correct it.
• If no city was provided, the forecast cannot be corrected.

This is usually caused by an incorrect latitude or longitude. While admins may catch errors, forecasters are responsible for quality controlling their work.

More complex scenario:

1. City provided → forecast moved to intended location.
2. No city provided → forecast stands as entered.

We remove SPC storm reports explicitly labeled as landspouts or gustnadoes. However, if a landspout is included in an NWS tornado warning (< 15 miles), it will be used for scoring.

1. SPC filtered tornado reports
2. NOAA Damage Assessment Toolkit data (when available)

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The average of all forecast points is treated as a single forecast and scored accordingly.

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