Storms began to develop around 9 p.m., and strong veering profiles in the lower levels combined with 2000-3000 j/kg CAPE and just enough speed shear to produce a few marginal supercells across central AR.
Refer to 00z 7/13/01 sounding for LZK
and the following SVR watch discussion:
THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND SOUTHERN ARKANSAS
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1030 PM UNTIL 400 AM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF EL DORADO
ARKANSAS TO 45 MILES NORTH OF LITTLE ROCK ARKANSAS.
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
OTHER WATCH INFORMATION... CONTINUE...WW 548...
DISCUSSION...THUNDERSTORMS HAVE DEVELOPED RAPIDLY DURING THE PAST
30 MINUTES ALONG A SURFACE BOUNDARY ACROSS CENTRAL AR. SURFACE
DEWPOINTS IN THE UPPER 70S WILL MAINTAIN STRONG INSTABILITY WELL
INTO THE OVERNIGHT HOURS ACROSS CENTRAL/SRN AR... WHILE DEEP LAYER
VERTICAL SHEAR IS SUFFICIENT FOR ORGANIZED SEVERE STORMS/
SUPERCELLS. THOUGH WARM TEMPERATURE PROFILES MAY LIMIT THE HAIL
THREAT SOMEWHAT... THE WIND DAMAGE THREAT SHOULD INCREASE AS STORMS
MERGE INTO A LARGER MCS AND MOVE SSEWD ALONG THE SURFACE BOUNDARY.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 32025.
At around 9:35, we caught up with a cell in Conway that was a prolific lightning producer and exhibited a beautiful and well-organized wall cloud that persisted for 15-20 minutes.
The wall cloud eventually began to fall apart, but the amount of bolts being produced by the cells was nothing short of amazing (comparable to the 6/5/01 cells near Woodward, OK), and while pushing south to stay ahead of the cells, we found ourselves in close proximity to a CG barrage that presented numerous photo opportunities. We finally ended the chase around 2 a.m. in Little Rock while shooting stills and watching the storms continue to the south.
Needless to say, a great chase considering it's July, and the wall cloud was enough to treat the SDS that was beginning to set in.