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May 2

May 2,1998    Dallas Metroplex Surprise Severe Storms

A dryline was located over C.Texas and the Dallas area was in a stable and fairly dry airmass. I went to Dallas to chase. By late afternoon, my curiosity took control so I took a sneak peek at radar. Sure enough, storms were popping around Waco and Temple and a couple were severe. With this in mind, I decided to head on south on I-35 to investigate. The storms were low-topped but were impressive in structure. Golfball sized hail was reported with the strongest storm near Waco.On radar, the storms appeared  to be dryline storms. No tornadoes were reported but large hail was common between Waco and Dallas. By evening, the storms continued to slowly develop northward. The dew-points were on the rise across N.Texas and shortly after dark, severe storms erupted in Dallas!! I returned to the Dallas area around 10:00 pm and was monitoring the amateur radio for the severe weather net. To my surprise once again, the net was not yet activated. The storms developed rapidly and immediately became severe with very large hail. I was on the north side of Dallas chasing one of the cells, and golfball sized hail soon pounded my vehicle. The storm was erupting overhead!! Hail reports soon filled the airwaves and there were a few reports of baseball sized hail.  The severe weather net quickly activated-almost as quick as the storms fired that evening....

May 5

May 5,     SW/SC Oklahoma Supercell

Very warm and unstable air was located over SW Oklahoma this day. A slight risk
of severe storms and isolated tornadoes was outlooked for the area. A weak warm
front extended across S. Oklahoma from near Altus to south of McAlester.A strong
cap held firm over the area during the afternoon and into the early evening hours.
This was the limiting factor (which the Storm Prediction Center mentioned in the
severe storm outlook ) which may prohibit storm development until after dark. The
first storm (elevated above the cap) formed over Tillman Co. and western Cotton
Co. Ok. I was on the H.E. Bailey turnpike near Walters Ok when the first storms
fired to the west. The Storm Prediction Center quickly posted a tornado watch for
S.Oklahoma along the warm front for these developing storms. Isolated tornadoes
were expected to develop with the supercells. The storms appeared to be under
the influence of the cap as they struggled eastward. NEXRAD detected weak mid-
level shear on these storms, and a tornado warning was issued as the supercell
briefly pulsed. Rotation became surface based for a brief period before the storm
weakened. Only one brief tornado observed by spotters in Stephens Co., but  there was many reports of moderate to large hail in SW and SC  Oklahoma. The
cap dominated the area. I returned to Tulsa after tracking the storms to just north
of Ardmore. Each spring, the cap becomes a limiting factor to potentially active
severe weather days; this day will be included as one of those days......

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