Daily Weather Summary
June 21, 1999:
High pressure well to our north dominating eastern US weather today. Water vapor satellite image indicates subsidence aloft, which may help put a cap on cloud growth today. Light winds from the surface to 850 mb this morning, however profilers show 15-20 kt northeasterly winds above ~2200 m MSL due to an upper level low in Georgia (700 mb). Partly cloudy today with a 10% chance of isolated afternoon thundershowers. High: 88 Low: 66 Mixing hgt.: ~2300 m MSL.
June 22, 1999:
Tuesday will be warmer and more moist in Nashville, with a 20% chance of isolated afternoon thundershowers. 850 mb winds will be easterly veering to southerly through the day, 5-10 kts. High: 90. Low: 68.
Day after Tomorrow Forecast
June 23, 1999:
Winds from the surface to 850 will be southerly, 5-10 kts. This southerly flow will be advecting moisture from the Gulf of Mexico. High: upper 80's Low: near 70. Isolated afternoon thunderstorms.
June 24 - 26, 1999:
With much higher moisture in the region, and a strong 500 mb shortwave trough approaching, chances for showers and thunderstorms look fairly good on Thursday. The MRF model closes this 500 mb low off over the Southeastern US into the weekend, which could mean several days of rain/tstorms here, but this may not occur, so Friday and Saturday look questionable at this time. Stay tuned. Lows: near 70. Highs: 82 to 88.
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.
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)