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Snowfall Analysis at FGF using Snoopy and ArcGIS

Snowfall Analysis at FGF using Snoopy and ArcGIS. Mike Lukes NWS Service Hydrologist WFO Eastern North Dakota Grand Forks, ND . Snowfall Reports to Graphic Analysis. Collect 1, 2, or 3-Day Snowfall Amounts from the Hydro DataBase (IHFS).

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Snowfall Analysis at FGF using Snoopy and ArcGIS

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  1. Snowfall Analysis at FGFusing Snoopy and ArcGIS Mike Lukes NWS Service Hydrologist WFO Eastern North Dakota Grand Forks, ND

  2. Snowfall Reports to Graphic Analysis • Collect 1, 2, or 3-Day Snowfall Amounts from the Hydro DataBase (IHFS). • Transfer Snowfall Data from AWIPS to PC-based ArcGIS host. • Use ArcMap and Spatial Analyst to make a raster Snowfall analysis graphic.

  3. SNOOPYAWIPS IHFS database “snooper” • Developed by Mike Callahan, SH @ WFO Louisville, Ky. (Available from LAD). • Graphical Interface to IHFS database. • Interactively runs SQL queries, saves results in electronic files. • Use INFORMIX flavor of SQL. • Plan to use Mike’s Pref – preformater utility - in the near future.

  4. SQL Queries • 1, 2, 3, 4-day Snowfall Analysis • 2-day Snow Depth Analysis • Snow Water Analysis • Other uses include AWOS 00z/12z precip amounts.

  5. select * from snow s where s.obstime = (select max(obstime) from snow where lid = s.lid and s.pe=‘SF’ and date(obstime) = today) and s.value>0 order by 1 into tem tsf1; select * from snow s where s.obstime = (select max(obstime) from snow where lid = s.lid and s.pe=‘SF’ and date(obstime) = today-1) and s.value>0 order by 1 into tem tsf1; select lid, value, obstime from tsf1 union select lid, value, obstime from tsf2 order by 1 into temp tsft; select lid, count, (*) num, sum(value) tot from tsft group by lid order by tot desc into tsff; select t.lid nwsli, round(t.tot,1) tot, round(l.lat,3) lat, round(l.lon,3)*-1 lon, t.Num num from tsff t, location l where t.lid=l.lid order by 2 desc; 2-day Snowfall SQL Querry

  6. GNU gFTP clientxfer Snow Analysis File to PC • FGF uses the Linux gFTP utility to xfer the Snow Analysis SQL results file to samba mapped network drive • Results file is accessible to ArcGIS on a local LAN PC. • NWS CRH has a number of “floating licenses” for ArcGIS and Spatial Analyst which the region’s WFOs can use locally. • Pref may be able to bypass gFTP step.

  7. Snow Amounts in ArcGISplotted on FGF HSA County Background • Results file contains NWSLI, Snowfall Amount, Lat, Lon, and # of daily obs. • Snow Amounts are plotted (add XY data from tools menu) on HSA county background. • NWSLIs can be also plotted for geographical orientation.

  8. Spatial AnalystSnow Analysis • Interpolated to Raster using: • Inverse Distance Weighting • Spline…??? • Kriging…??? • ArcUser Magazine Jul-Sep 04 “Interpolating Surfaces in ArcGIS Spatial Analyst” • To do: Compare spline and kriging to IDW for a better analysis.

  9. Contouring and Time Stamping • Spatial Analyst – Surface Analysis – Contour function. • Specify contour intervals. • Day/Time Stamp VB add-on. • DateElement icon put on toolbar. • Available from ESRI web page.

  10. Improvementsnotes, ideas and limitations • Use Pref for SQL query and file xfer • (RRM?) • Snow Obs from buffer counties • Improve boundary conditions for better analysis near borders • Can serve as 1st guess for subjective analysis • Compare to sat pix • IDW not good fit to natural snowfall patterns • Kriging? • Easier process to send to graphic to web

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