Flash Flood Warning 154, NWS Fort Worth, TX

TXZ019>033-030800-

SEVERE WEATHER OUTLOOK FOR NORTH TEXAS
NATIONAL WEATHER SERVICE FORT WORTH TX
530 AM CDT THU MAY 03 1990

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS TODAY ACROSS THE
EASTERN HALF OF NORTH TEXAS. THE AREA IS GENERALLY EAST OF A
GAINESVILLE TO LAMPASAS LINE. LARGE HAIL..DAMAGING THUNDERSTORM
WINDS AND TORNADOES ARE POSSIBLE WITHIN THE RISK AREA TODAY AND
TONIGHT.

AN UPPER LEVEL DISTURBANCE WILL TRACK ACROSS NORTH CENTRAL TEXAS..
INTO OKLAHOMA LATER THIS AFTERNOON AND TONIGHT. A DRY LINE..
SEPERATING DRY AIR TO THE WEST FROM A MOIST AIRMASS TO THE EAST
WILL SET UP ACROSS SOUTHWEST TEXAS LATER THIS MORNING AND MOVE
EASTWARD AS THE DISTURBANCE EJECTS NORTHEAST. THUNDERSTORMS WILL FORM
ALONG THE DRY LINE AND MOVE EAST INTO MOIST..CONVERGING SOUTHERLY LOW
LEVEL FLOW. IN TANDEM WITH THE DRY LINE..A MID LEVEL DRY INTRUSION
WILL ADVECT NORTHEASTWARD..ALLOWING FOR MORE SURFACE HEATING..THUS
ENHANCING THUNDERSTORM INTENSIFICATION DURING MAXIMUM HEATING TIME.

VERTICAL SHEARS WILL BE FAVORABLE FOR THE DEVELOPMENT OF INTENSE
THUNDERSTORMS ALONG THE DRY LINE..WITH TORNADIC ACTIVITY POSSIBLE.
IN ADDITION..THE RISK AREA WILL BE IN A FAVORABLE UPPER LEVEL JET
POSITION FOR INTENSIFICATION AND MAINTENANCE OF SEVERE THUNDERSTORMS
AS THEY PROCEED EASTWARD.

DUE TO ALREADY SATURATED GROUND CONDITIONS..WITH MANY RIVERS AND
LAKES ABOVE FLOOD STAGE..FURTHER RAINS WILL EXACERBATE AN ALREADY
SERIOUS FLOOD SITUATION. PERSONS IN THE RISK AREA MUST KEEP ALERT
TO THE LATEST ON THIS DEVELOPING WEATHER SITUATION AND BE PREPARED
TO TAKE IMMEDIATE ACTION SHOULD FLOODING OCCUR.

SPOTTERS AND EMERGENCY MANAGEMENT OFFICIALS THROUGHOUT THE RISK AREA
ARE URGED TO MONITOR RADIO..TV OR NOAA WEATHER RADIO AND BE PREPARED
FOR ACTIVATION LATER TODAY AND TONIGHT.