Overview of the Hydrometeorological Prediction Center Precipitation/Flash Flood Products/Services Michael Eckert

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Presentation transcript:

Overview of the Hydrometeorological Prediction Center Precipitation/Flash Flood Products/Services Michael Eckert National Flood Workshop

Storm Prediction Center Space Weather Prediction Center Aviation Weather Center NCEP HQ Hydrometeorological Prediction Center Climate Prediction Center Ocean Prediction Center Environmental Modeling Center NCEP Central Operations Nat’l Hurricane Center NCEP height of the 02/10/10 Blizzard

Mission: HPC delivers weather forecast guidance and services in support of the daily activities of the National Weather Service and its users. NWS ROLES: Starting point Second opinion Catalyst for Collaboration Historical Record Emergency Backup Hydrometeorological Prediction Center Camp Springs, MD

HPC Responsibilities Model Diagnostics Surface Analysis QPFMedium Range Daily Weather Map Short Term Weather Winter Weather Alaska Med. Range Tropical Hydrometeorological guidance for: NWS Field Offices Other NCEP Centers Federal/State Agencies Media Private Sector International Partners Academia General Public Mitigation of: Loss of life & Injuries Loss of property

Precipitation Area of Responsibility Runoff into Columbia River Runoff into Rio Grande River

Deterministic QPF Graphics Probabilistic QPF Graphics Excessive Rainfall Graphics Flood Outlook Graphics Storm/Tropical Summaries Written Discussions Verification HPC Quantitative Precipitation Forecast Products

Provided as: Graphics Web AWIPS GRIB 2 format Web only ftp.hpc.ncep.noaa.gov GIS format Web only KML for Google Maps Deterministic QPF

6 hour QPF through Day 3.5 Day 1 & 2 – 06, 10, 18 & 22 Day 3 – 10 & 22z 24 hour QPF through Day 3 Day 1 & 2 – 06, 10, 18 & 22z Day 3 – 10 & 22z 48 hour QPF Days z & 12z 6-h disaggregation via GEFS Day 1-5 QPF total accumulation 00z & 12z Fuel for RFC hydrologic models, NDFD & many other uses Deterministic Quantitative Precipitation Forecast HPC QPF = Most likely areal-averaged QPF

QPF Desk HPC WFO RFC

Available QPF Forecast periods 6 hour QPF 24 Hour QPF48 hour QPF 72 Hour QPF120 Hour QPF

QPF in Google Earth

Probabilistic QPF Experimental Binormal probability distribution (density) function (PDF) HPC QPF is mode Variance is ensemble of: GFS NAM SREF ECMWF

Probabilistic QPF (Probability of exceeding a particular QPF amount) Probability of a particular QPF amount ≥ 0.01”…≥ 3.00” Select amount Select time period

Probabilistic QPF (Percentile of a particular QPF) Percentile Accumulations Select percentile Select time period Conversely…75% chance precipitation will exceed these amounts

Rainfall RFC 5km FFG HPC Excessive Rainfall Categorical probability of Rainfall Exceeding RFC FFG at a point Day 1, Day 2, and Day 3 products Day 1 updated: 03, 06, 15, 18 UTC OR as Necessary! Day 2 & 3 updated: 06 and 18 UTC SLGT = 5-10% MOD = 10-15% HIGH = >15%

SPC Mesoscale Discussion (0-6 hour discussion guidance) QUASI STATIONARY MCS REMAINS ELONGATED IN AN E-W FASHION ACROSS MUCH OF WRN/MIDDLE TN. ALTHOUGH LLJ MAY RELAX A BIT OVER THE NEXT FEW HOURS...SIGNIFICANT STRENGTHENING IS EXPECTED LATER THIS AFTERNOON…THIS STRENGTHENING SHOULD RESULT IN CONTINUED THUNDERSTORM DEVELOPMENT ALONG WRN/SRN FRINGE OF MCS WITHIN A VERY MOIST AIRMASS...PWAT APPROACHING 2 INCHES. NET RESULT APPEARS TO BE A CONTINUED HEAVY RAIN THREAT ACROSS MUCH OF WRN/MIDDLE TN.

Flood Outlook Product (FOP) Summary of expected river flood conditions over the U.S. during the next 5 days Data submitted by RFCs Pieced together at HPC

QPF Verification Threat/Bias Improvement over models Record threat scores Monthly Yearly Seasonal Specific Values Verified

Storm Summaries Issued 4 times per day (03Z, 09Z, 15Z & 21Z) Expansive organized heavy snow/heavy rainfall events Heavily used by Media Summaries include: 1.Headline – Describing the Event 2.General overview of Watches, Warnings & Advisories 3.Table of accumulations (snow or rain) & magnitude of wind 4.Future expectations of storm

Tropical Summaries Issued 4 times per day (03Z, 09Z, 15Z & 21Z) Starts when NHC Drops Advisories, but heavy rainfall remains a threat Format is exactly like NHC Tropical Public Advisories Summaries include: 1.Location 2.Watches, Warnings & Advisories 3.Discussion & 48 hour outlook 4.Hazards 5.Rainfall accumulations

Hydrometeorological Prediction Center 1.Forecast and Guidance on a National Scale 2.Experts focused on one particular forecast entity 3.Wide variety of Precipitation related products 4.Mitigation of: a.Loss of Life b.Injuries c.Property Damage

Questions?