SPC MESOSCALE DISCUSSION #1132 FOR NWRN PORTION OF NORTH CENTRAL TX
CONCERNING...HEAVY RAINFALL...

VALID 212109Z - 212300Z

ISOLATED HEAVY RAINFALL RATES UP TO 2 INCHES PER HOUR IS EXPECTED
TO PERSIST FOR THE NEXT 2-3 HOURS ALONG AND SOUTH OF THE RED RIVER
VALLEY INTO THE NWRN PORTION OF NORTH CENTRAL TX.  

REGIONAL RADARS/IR SATELLITE IMAGERY INDICATED AN INCREASE IN
THUNDERSTORM ACTIVITY DURING THE LAST HOUR OVER SPS AND EWD INTO
JEFFERSON COUNTY OKLAHOMA.  THESE STORMS DEVELOPED ALONG AND NORTH
OF A SWD MOVING OUTFLOW BOUNDARY...NOW LOCATED FROM JUST SW OF FDR
TO SPS TO 10 NE GVT TO EXTREME NWRN LA.  SUFFICIENT INSTABILITY
EXISTS ALONG AND SOUTH OF THIS BOUNDARY WITH SURFACE TEMPERATURES
IN THE LOWER 90S AND DEWPOINTS IN THE LOWER 70S...RESULTING IN
SBCAPES OF 2000-4000 J/KG.  DEEP MOISTURE REMAINS OVER THIS REGION
WITH PRECIPITABLE WATER VALUES RANGING FROM 1.8 TO 2.0 INCHES.

ADDITIONAL STORMS ARE EXPECTED TO DEVELOP ALONG AND JUST NORTH OF
SWD MOVING BOUNDARY FROM CLAY AND JACK COUNTIES AND EWD TO COOKE
AND DENTON COUNTIES.  CORFIDI VECTORS SUGGEST AN EWD PROPAGATION OF
10 KTS WHICH WILL SUPPORT SLOW MOVING STORMS.  IN ADDITION...DUE TO
THE DEGREE OF INSTABILITY AND DEEP MOISTURE OVER THIS REGION...
BRIEF HEAVY RAINFALL IS POSSIBLE AS STORMS INITIALLY DEVELOP ALONG
THE OUTFLOW BOUNDARY.

..MCBEATH-PETERS.. 06/21/00