Tools
Interactive weather and climate tools for Pennsylvania and beyond. Everything runs in your browser with public data — no accounts, no keys. Pages marked NEW combine several older tools into one.
Check Your Weather StationNEWUpload your station export and see how it compares, hour by hour, with the nearest airport and CoCoRaHS gauges — plus live neighbors.Station data & downloadsPA Severe Weather DeskNEWRadar, warnings, storm reports, surface obs, SPC outlooks and mesoanalysis for Pennsylvania on one live page.Live weatherSolar & UV Data CenterNEWHourly and daily sunshine and UV for any point from NASA POWER and Open-Meteo, with a solar-sensor calibration check.Station data & downloadsForecast Model PacketNEWNOAA outlooks, model-map links and model soundings in one place, saved as an offline packet.Soundings & modelsPA Mesonet DownloaderNEWBulk history from Penn State IDA (PEMN, FAA, CWOP, COOP, DEP) and Keystone Mesonet network files.Station data & downloadsPRISM & Terrain Data PlannerNEWDraw an area, choose PRISM climate variables and USGS elevation products, and get a ready-to-run download workflow.Climate & droughtSnow Season ExplorerEvery snow season since 1880 for Harrisburg, Pittsburgh, Williamsport, Scranton, Allentown, Philadelphia and Baltimore.Climate & droughtCentral PA Storm Catalog14,646 NWS State College storm reports, 1996–2025, on an interactive map with filters.Climate & droughtHarrisburg Winter Weather Dashboard73 storms since 2000: storm pages, snowfall maps, wind, freezing rain and winter records.Climate & droughtReanalysis SwitchboardOne front door to NOAA PSL reanalysis maps, composites and 20th Century Reanalysis plots.Climate & droughtPA Drought IntelligencePennsylvania drought index history 1895–2025, heat maps, persistence and the 2024–25 drought.Climate & droughtPA Custom Drought IndexA heat-and-sunshine-aware drought score for 2,484 grid boxes across Pennsylvania.Climate & droughtCold, Wet, Not Much SnowRanks the days that were cold with lots of precipitation but low snow ratios — sleet and rimed-snow events.Climate & droughtSPC Mesoanalysis DownloaderPull archived SPC mesoanalysis images for any event and time window.Radar & MRMSMRMS Weather GrabberOne-button MRMS radar/precip bundles from NOAA's public archive.Radar & MRMSMRMS Precip ForensicsBuild a rainfall-event packet from MRMS, drilling from event totals down to 1-hour windows.Radar & MRMSMRMS Severe ProductsRotation tracks, hail size, lightning and VIL grids for storm surveys.Radar & MRMSMRMS Bulk DownloaderAny MRMS product, any dates, discovered and zipped straight from NOAA's S3 bucket.Radar & MRMSMRMS Rainfall Point MapTap anywhere in south-central PA / northern MD for MRMS gauge-corrected rainfall totals (summer 2026 snapshot).Radar & MRMSPA Radar Beam CoverageHow high every NEXRAD beam sits over every 800 m cell in Pennsylvania.Radar & MRMSBufkit ExplorerInteractive HRRR soundings — Skew-T, hodograph and indices — with your own Bufkit files.Soundings & modelsBufkit Cross-SectionAnimated atmospheric cross-section between two stations.Soundings & modelsBufkit Transect BuilderUpload up to three Bufkit files for time-height plots and three-station cross-sections.Soundings & modelsStation Network Explorer1,500+ operating weather stations in and around Pennsylvania — search by radius or polygon and export.Maps & GISStation Network HistoryHow Pennsylvania's weather-station network grew and thinned, year by year since the 1800s.Maps & GISPA Station Map23,000 stations from every network on one map, with tiers and filters.Maps & GISUSHCN Siting QualityPennsylvania's long-term climate stations graded for siting quality.Maps & GISKML ForgeTurn CSV, Excel, JSON or GeoJSON into styled KML/KMZ for Google Earth.Maps & GISGeoForgeCSV to KML/KMZ with automatic elevation lookup.Maps & GISHorizon & Obstacle SurveyUse your phone's sensors to map trees and buildings around a weather sensor.Station data & downloadsRain Gauge ExplorerRank rain-gauge types by accuracy, winter performance, upkeep and cost.Station data & downloadsCoCoRaHS Export BenchBulk CoCoRaHS downloads by state, county and date, merged into one ZIP.Station data & downloadsCoCoRaHS PA ExporterPer-county CoCoRaHS export links for Pennsylvania.Station data & downloadsCoCoRaHS Near MeFind CoCoRaHS observers near a point and download their daily rain and snow.Station data & downloadsMADIS ExplorerBuild NOAA MADIS queries, decode QC flags and browse the variable catalog.Station data & downloadsIEM Autoplot Browser260 Iowa Environmental Mesonet Autoplots, searchable by topic and data source.Station data & downloadsDaily vs Hourly vs PRISM (June 1999)A case-study dashboard comparing station daily, hourly-derived and PRISM rainfall.Climate & droughtGrid Cell CalculatorHow big is an 800 m, 4 km or 1° grid cell — and how many fit in a state?CalculatorsL-Moment CalculatorPaste values and see every step of the sample L-moment calculation.Calculators
CPA review labs
Three deterministic, fixture-first surfaces are ready for review. Their values are demos, never live observations.
Satellite & Lightning Lab NEWGOES imagery, GLM activity, timeline gaps, freshness states, and provenance.Open lab ↗Rivers & Flooding Lab NEWGauge catalog, stage and discharge, threshold context, and hydrographs.Open lab ↗Forecast Verification Lab NEWForecast, MRMS truth, scores, reliability, rank, and spread-skill diagnostics.Open lab ↗