SPAS Quote Form SPAS operates in three different modes > SPAS general: pre-radar (~1995) storm analysis > SPAS-NEXRAD: radar-aided storm analysis > SPAS-real-time: real-time, radar-aided precipitation analysis Output includes, but is not limited to: > Hourly and total storm isohyets and/or grids in a variety of formats > Depth-area-duration (DAD) storm tables for user specified durations and area sizes > Precipitation mass curves at user-defined locations > Average precipitation depth clipped to watersheds/basins at user defined intervals (as frequent as 5-min for SPAS-NEXRAD and SPAS-real-time or as frequent as 1-hour for SPAS) > Storm return periods > Precipitation verification stats > Quality controlled precipitation gauge data > Station lists and documentation Storm Precipitation Analysis System (SPAS) – the most advanced, accurate and accepted gridded precipitation technology available. The Storm Precipitation Analysis System (SPAS) is a state-of-the-science hydrometeorological tool used to characterize the temporal and spatial details of precipitation events. SPAS is grounded on a decade of scientific research and development and has demonstrated reliability in post-storm rainfall analyses. SPAS has been used to analyze over 100 extreme precipitation events for purposes of runoff model calibration/validation, storm reconstructions for legal cases, and computing depth-area-duration (DAD) tables/curves for Probable Maximum Precipitation (PMP) projects. A new version of SPAS now operates in near real-time, providing high resolution, spatially interpolated precipitation in a timely manner for input into hydrologic applications. New techniques have been developed in SPAS to incorporate NEXRAD radar data together with observed rainfall gauge data, to compute accurate hourly and sub-hourly spatially distributed rainfall. Unlike any other radar-based precipitation product, SPAS achieves improved accuracy by calibrating quality controlled NEXRAD radar data with rain gauge observations each hour. Additionally, local bias adjustments to the radar-estimated precipitation are uniquely computed and spatially interpolated to ensure consistency between observed gauge data and corresponding grid pixels. The SPAS computed precipitation provides accurate and reliable hourly (or sub-hourly) precipitation over a region and/or individual watersheds with spatial scales down to approximately one third of a square mile and temporal scales as frequent as 5-minute. The high spatial and temporal resolution of the SPAS rainfall data allows for accurate determination of rainfall volumes over basins and sub-basins for runoff model calibration thereby greatly improving the precision, accuracy and reliability of hydrologic analyses. SPAS is a hydrometeorological tool that has a well-founded, accepted and proven history. Beta tests of its new real-time capabilities will be complete in late 2009 fall and ready for operational use shortly thereafter. The SPAS real-time software will be operated by Metstat, Inc. and Applied Weather Associates through a teaming arrangement with Weather Decision Technologies (WDT), a leader in NEXRAD data processing and precipitation analyses. Together with WDTs forecast products, SPAS will have the capability of providing high resolution precipitation forecasts out 10 hours. Using National Weather Service quantitative precipitation forecasts (QPF), forecast rainfall analyses can be extended to a week or more. SPAS real-time operates in the WDTs sophisticated computer facility, which is the world’s most advanced and reliable weather data delivery system. SPAS, both as a tool for analyzing historical storms and monitoring real-time precipitation, has unique capabilities, increased accuracy over all other radar-based precipitation products, and unmatched reliability. SPAS has been used to analyze nearly 200 of the most extreme precipitation events in the United States, including Hurricane Floyd, Hurricane Ivan and the Aurora, IL storm of 1996. SPAS results have been used in numerous PMP projects that have received regulator (Federal/State/Local) approval or are in the process of being approved. © Copyright 2003-2010 Metstat, Inc. All Rights Reserved.