Hydro - OCLO

This page is designed to host hydro references. Current VLab reference materials include:

• Hydro Hazard Simplification
  • HazSimp Job Sheet introduces forecasters to the changes with Hydro Haz Simp - Phase 1 (turnkey May 2021)
  • HazSimp FAQs


• Average Recurrence Intervals (ARIs)
  • ARI Reference Page - Users
  • ARI Download Instructions - Focal Points
    • ARI Installation Package for GFE
    • FFMP ARI configuration instructions
  • ARI CONUS-wide Images
  • FAQs for ARIs
  • Comparison of ARIs
    • NOAA Atlas-14 and NSSL developed slightly different ARI grids for the CONUS. This page shows some examples of how they can differ.
  • NOAA Atlas-14 ARI homepage (web)


• FFMP
  • FFMP Reference Page - Users


• Multi-Radar/Multi-Sensor (MRMS)
  • MRMS Products Guide


• Radar & Applications Course (RAC)
  • RAC Procedures Download Page
  • RAC Flash Flood Procedures Descriptions (PDF)


• High-resolution Precipitation Estimator (HPE) and Bias HPE
  • HPE/Bias HPE Reference Page - Users
  • HPE/Bias HPE Reference Page - Focal Points (PDF)
    • Greg Hanson presentation (PDF) - HPE misbin settings for complex terrain


• High-resolution Precipitation Nowcaster (HPN)
  • HPN Reference Page - Users
  • HPN Reference Page - Focal Points


• Warning Operations Course (WOC) - Flash Flood
  • Web-based Tools for Flash Flooding
    • During Operations
      • Univ. of Utah MesoWest
      • Advanced Hydrologic Prediction Service (AHPS)
      • Integrated Realtime Impacts Service (IRIS) - NOAA log-in required
      • Ensemble Situational Awareness Table
    • Hydrologic Modeling
      • OWP National Water Model
      • NSSL FLASH - development site
    • Verification/Review
      • Iowa State Univ. Mesonet
      • SPC Experimental LSR page - with FF reports
    • Situational Awareness/Outreach
      • National Digital Forecast Database
      • WR Experimental Post-Wildfire Page


• AWIPS Build Changes for Hydro
  • Click here to view a detailed list of hydro-related AWIPS build updates (available since 14.3.1)


• NWS Directives
  • NWS 10-921 (PDF) : WFO Hydrologic Operations
  • NWS 10-922 (PDF) : WFO Hydrologic Products Specifications
  • NWS 10-923 (PDF) : WFO Hydrologic Product Examples

Flash Flood Jobsheets and One-pagers

• Flash Flood Warning Methodology (.pdf)
  • A one-page methodology for flash flood warning operations, beginning with analyzing your environment and antecedent conditions through recommended FFW polygonology and text fundamentals.
• Flash Flood Assessment (.pdf)
  • A one-page assessment to help you work through the flash flood methodology, focused particularly on how to pick the optimal precip source.
• Flood Products Decision Tree (.png)
• WDTD Dual-Pol Flipchart