10/25/97 TX Chase by Sam Barricklow



From: Sam Barricklow (k5kj@PULSE.NET):
Subject:      Bustola Saturday

> The data looked better than the results.
>
> I opted to go east on I-20 instead of ENE on I-30 due to the higher CAPE
> values along I-20 and due to a traffic jam on I-30 in eastern Dallas
> County.
>
> The UOKNOR ADAP run at 16Z had a 4000 j/kg CAPE bullseye centered in
> Kaufman County, one county east of Dallas.  Helicity values were
> indicated to be around 150, with values steadily increasing toward a
> maximum in northern OK.  Early towers were crisp and hard, but after the
> initial storms went up and quickly moved northeast, most subsequent
> convection was soft and had that soft fuzzy tropical look.
>
> Golf ball hail was reported near Paris and a 70 mph wind gust was
> reported at Lake Tawokini.  Brief falls of marble and smaller hail
> occurred along the I-20 corridor with one inch diameter hail reported
> just SE of Tyler.
>
> One of the reasons for weakening of the convection was evident in the
> wind field.  A scattered line of storms stretched SSE from the "Paris"
> storm and lead the dryline storms farther south.  ("Banding" features of
> this type are often associated with meso lows or meso-cyclones.  Did the
> "Paris" hailer have a radar indicated meso?)  The surface wind field was
> better ahead of this line, with 20 to 30 mph gusts from the ESE and SE.
> Behind this leading line and ahead of the dryline, the winds veared to
> the south and SW at 10 to 15 mph.
>
> As the Paris storm moved into Oklahoma, a fairly good looking storm that
> had formed near Corsicana came into view and moved northeast toward
> Canton along or just ahead of the dryline.  I had high hopes for this
> storm at the time.  It produced a strong anvil and hard towers, but
> shortly after it crossed I-20 it collapsed and produced the high winds
> at Lake Tawokini.  The surface wind field in this area never recovered
> from the Paris storm's influence.  I suspect that the higher CAPE air
> had been pushed eastward ahead of the leading line.
>
> It was an interesting but frustrating chase.  Visibilities were better
> than I had expected, although there was some ground fog just behind the
> first line with an air temp of 74 degrees.  RADAR updates were heard via
> 444.825 MHz from NWSFO FTW and via the East Texas SKYWARN net on 147.32
> MHz.  More info than expected was available.
>
> Sam Barricklow
> http://www.stormchaser.net/k5kj/mineola.htm
> Images of a similar, but more productive chase into East Texas a few
> years ago.


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