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Alternative Data and Forecast Products, Listed by Data Source

This page gives some alternative data and forecast sources for precipitation, temperature, dewpoint temperature, solar radiation, and wind data to replace data from Argonne National Laboratory for use in the USGS - Du Page County Salt Creek Flood-Simulation System when Argonne data are unavailable, and to supplement the standard forecast methodology used in that simulation system. There are two versions of this page: one version organized by data or forecast source and one organized by the weather parameter being sought. This page is organized by data source. The delivery of weather data and forecasts by government and private entities is continually evolving; therefore, please contact the Maintainer of this page if links appear to be incorrect or if other sources should be added.

Disclaimer: 

The data and forecasts to which links are provided on these pages are not produced or quality-controlled by the US Geological Survey, and no official endorsement is implied. Users should exercise caution regarding the accuracy of these data and forecasts, and utilize them at their own risk.

I. Past Weather Data

Primary Backup (All Parameters):
Title/URL Description
WARM/ICN - St. Charles - Hourly Parameters: All
Lag Time: 1-2 days
Access: email Bob Scott (r-scott5@uiuc.edu)
WARM/ICN - St. Charles - Daily
http://www.sws.uiuc.edu/warm/datatype.asp
Parameters: All
Lag Time: Up to 1 month

Access: Click on 'Monthly Data' (easier to read) or '2002' (more up-to-date)
Secondary Backup (All Parameters except Solar Radiation):
Weather Underground
Stations:

Parameters: All parameters except Solar Radiation
Lag Time: Less than 1 hour
Time Res.: 1 hour
Use: Choose date next to "Historical" under "Conditions" bar and click "Go".
Other Sources:
Precipitation: NEXRAD
Title/URL Description
KLOT Radar Images 
Lag Time: 5-10 minutes
Time Res.: 5 minute to 1 hour 
KLOT Digital DPA (under construction) Lag Time: 5-10 minutes
Time Res.: 5 minute to 1 hour 
NCRFC MPE Images
http://www.crh.noaa.gov/cgi-bin-ncrfc/uncgi/s3hr
Lag Time: 6-12 hours
Time Res.: 1 hour
NCRFC Digital MPE (under construction) Lag Time: 6-12 hours
Time Res.: 1 hour
Other Weather (Temp., Dewpoint/RH, Radiation/Cloud Cover, Wind)
Title/URL Description
Accuweather 'Past 24 Hours'
Stations:

Parameters: Temp., RH, Pressure, Wind, Visibility, Weather type
Lag Time: Less than 1 hour
Time Res.: 1 hour (higher during storms)
Use: After selecting station, click on 'Past 24 hours' from menu on left.
NWS Current Weather Conditions
Stations:
Parameters: Temp., Dewpoint, Pressure, Wind
Lag Time: Less than 1 hour
Time Res: 1 hour
Use: Select station on left.
 
Accuweather 'Past Year'
Stations:

Parameters: Min/Max Temp., Precip.
Lag Time: Less than 1 day
Time Res.: 1 day
Use: After selecting station, click on 'Past Year' from menu on left.
MRCC / MICIS

http://mcc.sws.uiuc.edu/index.html
Parameters: Hourly: Temp., Dewpoint/RH, Pressure, Wind
                     Daily: Solar radiation, PET
Lag Time: 1-2 days
Access: through paid subscription account

II. Forecasts

Title/URL Description
Accuweather
Enter Zip Code:
Parameters: Precip., Temp., Dewpoint/RH, Wind, Cloud cover, Wx
Max. Lead Time: 48 hours
Time Res.: 1 hour
Use: Click on 'Hourly Forecasts' from menu on left
Notes: Unlike past weather, Accuweather forecasts are different even for nearby locations
WSFO Chicago
Graphical: http://www.crh.noaa.gov/ifps/ifps.php?site=lot
Text: http://www.crh.noaa.gov/lot/forecasts/rdf.txt
Parameters: Temp. Dewpoint, Wind, Wx, PoP
MOS (Model Output Statistics) Forecasts
http://www.nws.noaa.gov/mdl/synop/products.htm
Parameters: Precip., Temp., RH, Wind, Sky cover/vis./ceiling, Severe weather
Max. Lead Time: 48-192 hours
Time Res.: 3-24 hours
Notes: See 'description' links for descriptions. Some products are experimental.
Link for NWP model descriptions:
http://www.srh.noaa.gov/ftproot/
ssd/nwpmodel/html/nwplinks.htm
NCRFC Flash Flood Guidance
http://www.crh.noaa.gov/ncrfc/html_frames/floodindex.html
Definition: Depth of rain over 1, 3, or 6 hours needed to induce flash flooding
Choices: Text (point) or Graphical (aerially averaged) estimates
In text tables, points of interest may be:
     WSP2: Salt  Creek at Western Springs
Experimental 0-3 Hour Convective Weather Forecast Products
http://www.nws.noaa.gov/tdl/scan/scan_svr_03h.htm
Description:
Experimental short-term forecasts of convective weather and precipitation depth

III. Distribute daily solar radiation to hourly (in *.hsp format)

Month(mm)            Day(dd)            Year(yyyy)  
Daily Value      Units: MegaJoules / sq. meter (Daily Total)    Watts / sq. meter (Daily Average)

IV. Conversions

Precip. Depth

          Millimeters (mm) to Inches (I) :

                  I = mm / 25.4  

Temperature

Degrees Celsius (oC) to degrees Fahrenheit (oF) :  

        oF = (9 / 5) * oC + 32

Dewpoint / Relative Humidity

Relative Humidity (RH) and Temperature in oF (oF) to Dewpoint Temperature in oF (DTF) : 

1) Compute saturation vapor pressure (esat) in millibars (mb) by

        esat = 6.11 * exp ( 17.3 T / (T+237.3) ),   where T is temperature in oC

2) Compute vapor pressure (e) in mb by

        e =  RH * esat.

3) Compute Dewpoint temperature Tdew in oC by

        Tdew = ( ln(e) - 1.810) / ( 0.0805 - 0.00421 ln(e) ).

4) Convert Tdew from oC to oF using temperature conversion above.

Reference: S.L. Dingman (1994), Physical Hydrology, Prentice-Hall, p. 516-517.

Wind

Knots (KT) to miles per hour (MPH) :

        MPH = 1.1508 * KT

Meters per second (MPS) to MPH : 

        MPH = 2.2369 * MPS

Solar Radiation

MegaJoules / sq. meter (MJ/m2) to Langleys (L) : 

        L = 23.88 * (MJ/m2)

Watts / sq. meter (W/m2) to Langleys / hour (LPH) : 

        LPH = 0.08598 * (W/m2)

Return to the USGS-DuPage County Flood-Simulation System for Salt Creek web pages.

U.S. Department of the Interior || U.S. Geological Survey || Illinois Water Science Center
URL: http://il.water.usgs.gov/proj/saltcreek/altdatasrc.html
Maintainer: decfss@usgs.gov
Last modified: February 26, 2003
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