Department of Commerce Homepage    NOAA Homepage             National Weather Service Homepage    NCEP Homepage
Weather Prediction Center

Current Products

Short Range

Medium Range

QPF

Exces. Rain
Wint. Wx

Tropical

Selected Cities/
Travelers Forecast

Model Diagnostics
and Biases

Surface Analysis

Experimental

International Desks
International
Desks


 


About the Winter Weather Forecasts

Issuance Times

Product Time
93s, 94s 0215Z, 0615Z, 1415Z, & 1815Z
98s 0700Z & 1900Z
Discussion 0300Z, 0745Z, 1500Z, & 1945Z

line

About These Products

The SOLID LINES indicate the forecaster confidence (low, moderate and high) that the area to the right of the arrow will receive greater than or equal to four (4) inches of snowfall in a 12 hour period on the 93s and 94s products, and six (6) inches of snowfall in a 24 hour period on the 98s product.  The DASHED LINES indicate the forecaster confidence (low, moderate and high) that the area to the right of the arrow will receive greater than or equal to one quarter-inch (0.25") of ice accumulation on all three products.

EXPLANATION OF FORECASTER CONFIDENCE 

The WPC has decided to modify its current heavy snow guidance product in an effort to make it more useful to those making decisions based on this forecast. This is described in the Public Information Statement. The confidence levels used can be considered comparable to the probability of occurrence of the forecasted parameter. For example: 

  • LOW - 20% to 30% chance of occurrence within the outlined area.
  • MODERATE(MDT) - 31% to 70% chance of occurrence   within the outlined area.
  • HIGH - greater than 70% of occurrence within the outlined   area.


At times the forecasters my use only one or two isolines for the forecast. This simply implies low or low to moderate forecaster confidence in the occurrence of the forecasted parameter. One should expect the confidence to lower as the forecast is extended out in time. To gain further insight into this forecast, please read the Heavy Snow/Icing Discussion (HSD) that accompanies this graphical product. 

line

Public Information Statement

line



If you have any questions or comments about these or any of our products, 
we would like to hear from you.

Click here to send mail to the WPC.



WPC HOME 

What's New

About WPC

WPC
Accomplishments

Product Information

WPC
Verification

Research

Other Sites


Other
NCEP Centers:
AWC CPC
EMC MPC
NCO SEC
SPC TPC

Disclaimer
Please read!


Search NOAA Web Pages


 
Last Updated
November 21, 2001