SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0159 AM CST Sun Dec 20 2020 Valid 221200Z - 231200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Tuesday. ...Synopsis... Shortwave ridging is anticipated to be in place over the central CONUS early Tuesday, with shortwave troughs flanking on either side. Overall pattern is expected to progress eastward with the western CONUS shortwave trough moving east-southeastward while deepening. This deepening may lead to bifurcation of the wave, with the southern portion over the Four Corners region early Wednesday. At the surface, lee troughing is expected to deepen ahead of the approaching shortwave trough. Surface cyclogenesis is anticipated over the northern High Plains, with the resulting low moving eastward across the northern Plains. Secondary cyclogenesis is possible over the central High Plains late Tuesday night/early Wednesday morning. By 12Z Wednesday, an expansive area of low pressure encompassing both of these lows will cover much of the Plains and MS Valley. A strong cold front attendant to these surface lows will sweep across the northern and central Plains. However, low-level moisture will be confined to central/south TX, and the resulting lack of buoyancy will preclude thunderstorm development along the front. ..Mosier.. 12/20/2020
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