How to Get Accurate Forecasts for Reducing Weight Limits Wayne - - PowerPoint PPT Presentation

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How to Get Accurate Forecasts for Reducing Weight Limits Wayne - - PowerPoint PPT Presentation

Jun 20, 2023 208 likes •627 views

How to Get Accurate Forecasts for Reducing Weight Limits Wayne Schoonover Mason CRC Manager/Director Sean Thorpe CTT Roadsoft Software Engineer Agenda Thaw weakening Thawcaster origin Walk through Questions Why Spring Load

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How to Get Accurate Forecasts for Reducing Weight Limits Wayne Schoonover – Mason CRC Manager/Director Sean Thorpe – CTT Roadsoft Software Engineer

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Agenda

  • Thaw weakening
  • Thawcaster origin
  • Walk through
  • Questions
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Why Spring Load Restrictions?

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Thaw Weakening!

Strength Winter Summer Fall Spring Restrict Load

From FHWA Guidelines for Spring Highway Use Restrictions

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Terms

Freezing Index (FI) Thawing Index (TI) Thawing Index using Minnesota Method (TI*)

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Start Counting FI

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When to Put Restriction on

Table 2

Thawing Index (oF-days) Pavement Structure BST/Asphalt Concrete Thickness (inches) Base Course Thickness (inches) Should Level Must Level

  • Thin

2” or less 6” or less 10 40

  • Thick

Greater than 2” Greater than 6” 25 50

From FHWA Guidelines for Spring Highway Use Restrictions

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When to Take Restrictions Off

Guidelines state when TI = 0.3 X FI 0.3 X FI is approximately when it is thawed

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Start Counting TI

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0.3 X FI

Is Not when it stops bleeding and settled back down! Use visual judgement and experience

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WEATHER FORECASTING: IN THE BEGINNING…

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Origin Program Overview Data collection Tools User setup Upcoming plans

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How did LTAP get involved?

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Thawcaster Basic

Historic data and forecasts FI, TI, TI* web based tracking tool Data stored in cloud Desktop and mobile ready

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Thawcaster Advanced

Worst case forecast scenarios Forecast site error rates Data exports for custom analysis

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What Thawcaster does Not Not do

A perfect fit for all soil types Replace engineering judgement Replace experience

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Thawcaster Potential Data Sources

Weather Underground Weather Unlocked NOAA Forecast IO Open Weather Map APIXU

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Thawcaster Data Collection

Data initially collected from a single provider Eventually collected from multiple providers Collected via weather web API Stored in database

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Tools

Thawcast Historical annual Thawcast Weather station error analysis

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Thawcast

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Thawcast Tracker

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Historical Annual Thawcast

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Weather Station Error Rate

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Weather Station Error Rate

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Weather Station Error Rate

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User Setup

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Station List

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Station Map

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Weather Stations

  • Create account
  • Request weather station by zip code
  • Data will automatically be gathered using available

data providers (initially a single provider)

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Thawcaster Initial Release 2/20/17

  • Request station by zip code
  • Thawcast for current weather forecast
  • FI/TI data for the current season
  • Data export
  • Add comments
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Additional Release Plans

  • Multiple data providers
  • Editable Thawcast or making custom projections
  • Annual historical Thawcast for years past
  • Comprehensive weather station error analysis
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Questions and Ideas?

ctt@mtu.edu Phone: (906) 487-2102