THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST ARKANSAS...SOUTHEAST OKLAHOMA...AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... SHOWERS AND THUNDERSTORMS WILL BECOME NUMEROUS THIS EVENING ACROSS CENTRAL AND EASTERN OKLAHOMA...AND SPREAD EAST INTO EXTREME SOUTHEAST OKLAHOMA AND ADJACENT SECTIONS OF SOUTHWEST ARKANSAS AFTER MIDNIGHT. SOME OF THESE STORMS MAY BECOME SEVERE AS THEY ENTER THE REGION LATE TONIGHT...WITH DAMAGING WINDS AND LARGE HAIL. STORMS WILL WEAKEN LATE TONIGHT AS INSTABILITY DIMINISHES. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... SHOWERS AND THUNDERSTORMS OVERNIGHT WILL LEAVE CONVECTIVE BOUNDARIES IN PLACE TUESDAY...WHICH WILL FOCUS SCATTERED SHOWERS AND THUNDERSTORMS THROUGH MUCH OF THE DAY TUESDAY...AS THE AIR MASS DESTABILIZES DURING PEAK HEATING IN ADVANCE OF AN UPPER LEVEL TROUGH OF LOW PRESSURE. SOME THUNDERSTORMS WILL BECOME SEVERE TUESDAY AFTERNOON...PRODUCING HIGH AND DAMAGING WINDS...LARGE HAIL... DEADLY LIGHTNING...AND LOCALLY HEAVY RAINFALL. THESE STORMS ARE EXPECTED TO DEVELOP INTO A LARGER CLUSTER OF SHOWERS AND THUNDERSTORMS TUESDAY NIGHT...AS THEY ADVANCE EAST SOUTHEAST ACROSS EAST TEXAS AND SOUTHWEST ARKANSAS. RAINFALL AMOUNTS OF ONE TO THREE INCHES WILL BE POSSIBLE...WHICH CAN RESULT IN LOCALIZED FLASH FLOODING AND PONDING OF WATER IN STREETS...LOW LYING...AND POOR DRAINAGE AREAS. SHOWERS AND THUNDERSTORMS WILL DIMINISH FROM WEST TO EAST LATE TUESDAY NIGHT AND EARLY WEDNESDAY. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO OPERATORS...AND STORM SPOTTERS MAY BE NEEDED LATE TONIGHT ACROSS SOUTHEAST OKLAHOMA AND ADJACENT SECTIONS OF SOUTHWEST ARKANSAS... AND EXTREME NORTHEAST TEXAS.