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About
the Quantitative Precipitation Forecasts
About 24 Hour
QPF About
6 Hourly QPF
24 Hour QPF Issuance Times
Product 
Time 
94q (preliminary Day 1) 
0615Z & 1815Z 
94q (final Day 1) 
1015Z & 2215Z 
98q (preliminary
Day 2) 
0700Z & 1900Z 
98q (final Day 2) 
1015Z & 2215Z 
99q 
1015Z & 2215Z 
95e (Day 15 total) 
1730Z 
QPFPFD (prelim. Day 1) 
0700Z & 1900Z 
QPFPFD (prelim. Day 2) 
0745Z & 1945Z 
QPFPFD (with Days 13) 
1100Z & 2300Z 
About The 24 Hour QPF Products
Isohyets of expected basin
average rainfall of .01 inch, .25 inch, .50 inch, 1 inch, 1.50 inch and
greater (in inch increments) are drawn for the 24 hour forecast period
ending at 1200Z on both days 1, 2, and 3. The daily QPF package begins
on the midnight shift with the 0000Z model run. A preliminary Day
1 forecast (94Q) is issued by 06Z and the Final Day 1 (94Q) is issued by
10Z and is valid at 1200Z the following morning. The Day 2 QPF (98Q) is
issued by 1000Z. The Day 2 forecast (98Q) is updated on the day shift and
is issued by 1800Z.
An electronically generated bulletin, which describes
the location of the forecast isohyets using latitude and longitude points,
is transmitted at the end of the qpf discussion for the Day 1 through Day
3 finals.
Example:
0.25 350731 349761 349789
347803 340819 327837 310854 297864 284874
0.50 404072 395071 390076
387081 389084 395085 402082 404076 404072
The first field is the value of the contour (in
this case...0.25" or 0.50"). The following fields are the latitude/longitude pairs
for the contour. The first three digits of the pair are the degrees of
latitude (in tenths of degrees North latitude). The last three digits of
the pair are the degrees of longitude (in tenths of degrees West longitude).
If the fourth digit is less than 5, a leading "1" is added to indicate
longitudes greater than or equal to 100° W. From the above message...the
following table gives the decoded lat/long pairs 
Value: 0.25" 
Value: 0.50" 
35.0N, 73.1W 
40.4N, 107.2W 
34.9N, 76.1W 
39.5N, 107.1W 
34.9N, 78.9W 
39.0N, 107.6W 
34.7N, 80.3W 
38.7N, 108.1W 
34.0N, 81.9W 
38.9N, 108.4W 
32.7N, 83.7W 
39.5N, 108.5W 
31.0N, 85.4W 
40.2N, 108.2W 
29.7N, 86.4W 
40.4N, 107.6W 
28.4N, 87.4W 
40.4N, 107.2W 
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.

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Last Updated
February 9, 2001
