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Full-Text Articles in Physics

Role Of Stratospheric Air In A Severe Weather Event: Analysis Of Potential Vorticity And Total Ozone, Melissa A. Goering, William A. Gallus Jr., Mark A. Olsen, John L. Stanford Jun 2001

Role Of Stratospheric Air In A Severe Weather Event: Analysis Of Potential Vorticity And Total Ozone, Melissa A. Goering, William A. Gallus Jr., Mark A. Olsen, John L. Stanford

Geological and Atmospheric Sciences Publications

The role of dry stratospheric air descending to low and middle tropospheric levels in a severe weather outbreak in the midwestern United States is examined using NCEP Eta model output, Rapid Update Cycle (RUC) analyses, and Earth probe Total Ozone Mapping Spectrometer (EP/TOMS) total ozone data. While stratospheric air was not found to play a direct role in the convection, backward trajectories show stratospheric air descended to 800 hPa just west of the convection. Damaging surface winds not associated with thunderstorms also occurred in the region of greatest stratospheric descent. Small-scale features in the high-resolution total ozone data compare ...


Fine-Scale Comparison Of Toms Total Ozone Data With Model Analysis Of An Intense Midwestern Cyclone, Mark A. Olsen, William A. Gallus Jr., John L. Stanford, John M. Brown Aug 2000

Fine-Scale Comparison Of Toms Total Ozone Data With Model Analysis Of An Intense Midwestern Cyclone, Mark A. Olsen, William A. Gallus Jr., John L. Stanford, John M. Brown

Geological and Atmospheric Sciences Publications

High-resolution (∼40 km) along-track total column ozone data from the Total Ozone Mapping Spectrometer (TOMS) instrument are compared with a high-resolution mesoscale numerical model analysis of an intense cyclone in the Midwestern United States. Total ozone increased by ∼100 DU (nearly 38%) as the TOMS instrument passed over the associated tropopause fold region. Complex structure is seen in the meteorological fields and compares well with the total ozone observations. Ozone data support the meteorological analysis showing that stratospheric descent was confined to levels above ∼600 hPa; significant positive potential vorticity at lower levels is attributable to diabatic processes. Likewise, meteorological ...


Electromagnetic Noise Studies Of Severe Convective Storms In Iowa: The 1970 Storm Season, S. L. Stanford, M. A. Lind, Eugene S. Takle Jan 1971

Electromagnetic Noise Studies Of Severe Convective Storms In Iowa: The 1970 Storm Season, S. L. Stanford, M. A. Lind, Eugene S. Takle

Geological and Atmospheric Sciences Publications

Electromagnetic noise from six convective storms in Iowa has been studied at a variety of frequencies from 0.67 to 144 MHz, with the majority of the data being recorded at 53 MHz. The quasi-static atmospheric electric field was also studied. Twelve tornadoes, numerous funnel clouds and several hailstorms occurred during these storms. Eleven of the tornadoes appear to correlate with some type of enhancement of the recorded electromagnetic pulse rate. A spectacular peak in pulse rate during Storm No. 5 is attributed to a brief but destructive tornado at 38 km; the event is discussed in detail. One tornado ...