You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
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ZCZC SPCSWOD48 ALL ACUS48 KWNS 190845 SPC AC 190845
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0345 AM CDT Fri Apr 19 2019
Valid 221200Z - 271200Z
Monday/Day 4 and Tuesday/Day 5
On Monday, the medium range models including the ECMWF, GFS, Canadian and UKMET move an upper-level trough across the western states and have an upper-level ridge in the east. Southwest mid-level flow is forecast in the southern and central Plains with a corridor of maximized low-level moisture located from east Texas north-northeastward into the mid to upper Mississippi Valley. The models suggest that thunderstorms will be possible along the northwestern edge of the moist sector but uncertainty is substantial concerning the magnitude of moisture and instability. Although a severe threat will be possible, predictability is too low for an outlook area.
On Tuesday, the models move a cold front southward into the southern Plains extending east-northeastward into the Ohio Valley and Northeast. Thunderstorms will be possible along parts of the front Tuesday afternoon. The best chance for an isolated severe threat would be in the southern Plains where several solutions suggest surface dewpoints will be in the 60s F. Uncertainty is again substantial concerning the finer-scale details on Tuesday.
Wednesday/Day 6 to Friday/Day 8
The models diverge somewhat on Wednesday concerning the position of an upper-level trough across the southern tier of the U.S. However, the ECMWF and GFS solutions are in agreement that a moist and unstable airmass will be in place across south Texas Wednesday afternoon. Strong deep-layer shear and moderate instability is forecast with convective potential. For this reason, it appears that a severe threat could develop across parts of south Texas Wednesday afternoon and evening. At this point, would like to see more run to run consistency before adding a severe threat area.
On Thursday and Friday, the models move an upper-level trough across the southern U.S. but differ on the speed and timing of the system. The magnitude of instability ahead of the system is also in question. If a moderately unstable airmass develops across the Gulf Coast areas on Thursday and Friday, then a severe threat would be possible ahead of the upper-level trough. At this point, predictability remains too low to add a severe threat area.
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