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Weather Forecasts

Daily Weather Summary

June 29, 1999:

A frontal boundary is now located just to the south of BNA, so winds have turned back to the NW and a little drier air is moving in. Therefore, despite some occasional clouds this afternoon, rain chances are slim to none. 850 mb winds are from the NW, and will be decreasing from 20-25 kts at noon to around 10-15 kts by late afternoon. High: 87 Low: 69. Mixing Hgt.: ~ 1600 m.

Tomorrow's Forecast

June 30, 1999:

The frontal boundary heads back northward on Wednesday, as an upper level shortwave approaches. Humidity returns to an extent, and with the shortwave approaching, expect more clouds than there were on Tuesday, with some showers and thunderstorms moving through the area, mainly in the afternoon and evening. 850 mb winds will be 10-15 kts, backing from the WSW early to the SSW late. High: 86 Low: 72

Day after Tomorrow Forecast

July 1, 1999:

Another 500 mb shortwave approaches from the WNW, so some shower and thunderstorm activity still a good bet in Tennessee on Thursday. High: 85 Low: 72

Outlook

Surface ridge finally starts to build in Friday through Sunday, as series of 500 mb shortwaves most likely comes to and end. Expect mostly sunny skies, with isolated afternoon and evening thunderstorms. Highs: 92-96 Lows: 71-77.

Profiler Plume Depiction

The following shows a depiction of plume locations as predicted by the profiler winds assimilated into a one-dimensional boundary layer model. The top image shows particle positions as of the previous evening. The lower image shows particle positions as of the following morning for particles released beginning the previous noon.

Forecast Plumes

The following gives a depiction of plume locations using a Lagranagian Particle Model coupled to the Regional Spectral Model. The RSM is run daily in a forecast mode at TVA Muscle Shoals, Alabama.

Plume based on 00z initial fields (mpg file optimized for QuickTime)

Plume based on 12z initial fields (mpg file optimized for QuickTime)

ARL Hysplit Trajectories

Nashville Soundings