Great Plains Heavy Rain Indicated by 12Z GFS

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Fig. 1: Heavy rain is indicated in the Central U.S. based on the 12Z GFS.

Discussion: At midday, the 12Z GFS unloads heavy rain on the core of the U.S. drought zone in Kansas and vicinity (Fig. 1). Additional heavy rain in the Southeast U.S. The 12Z GFS 15-day precipitation forecast was much heavier since 24 hours ago in the central Great Plains while the outlook is much drier across Oklahoma and the Upper Midwest (Fig. 2). Virginia to the Southeast U.S. is also much wetter since 24 hours ago. The 12Z GFS 15-day outlook at midday averaged cooler (less warm) across the Central and East U.S. (Fig. 3). The May 12-18 CDD forecasts lost all gains made 24 hours ago with a much cooler change (Table 1).

Fig. 2: The 12Z GFS 24-hour rainfall change.

Fig. 3: The 12Z GFS 24-hour temperature change.

DatesCDD Forecast12-Hr Change24-Hr Change10-Year NML30-Year NML
Apr. 28-May 4

 

11.2-0.4-0.616.016.4
May 5-11

 

 

22.5-3.8-2.520.221.4
May 12-18

 

 

25.3-14.5-18.525.828.2

Table 1: The 12Z GFS U.S. population weight CDD forecast compared to 12 and 24 hours ago.

DatesHDD Forecast12-Hr Change24-Hr Change10-Year NML30-Year NML
Apr. 28-May 4

 

74.2-0.2-0.455.654.6
May 5-11

 

 

42.7+9.5+7.245.143.8
May 12-18

 

 

22.6+2.1+2.335.333.7

Table 2: The 12Z GFS U.S. gas population weight HDD forecast compared to 12 and 24 hours ago.