1 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Tulsa, OK wrote its last area forecast discussion before the first event at May 20, 2:20 AM CST, 5 hours 30 minutes earlier.
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 320 AM CDT SUN MAY 20 2001 MODERATLY STRONG S/W TO PROGRESS ACROSS THE REGION THROUGH TONIGHT. BIG WEATHER STORY THIS FORECAST MAY NOT BE THE CHC FOR SVR CONVECTION THIS AFTERNOON AND TONIGHT...BUT RATHER THE VERY COOL AND POSSIBLY DREARY CONDITIONS EXPECTED MONDAY AND MONDAY NIGHT. CURRENT CONDITIONS SEEM TO BE FOLLOWING OFFICE AND MODEL FORECAST SCENARIOS FAIRLY WELL. CONVECTION FINALLY GETTING GOING NEAR KICT IN SC KS NOW. A LINE OF STORMS IN SW OK ALSO LOOKING STRONGER. EXPECT THIS SHRA/TSRA ACTIVITY TO INCREASE IN COVERAGE THROUGH THE MORNING BUT WEAKEN IN INTENSITY. INSTABILITY IS PRETTY LOW RIGHT NOW WITH THE WORKED OVER ATMOSPHERE FROM PREVIOUS CONVECTION IN SRN OK. FORECAST FOR NEW CONVECTION THIS AFTERNOON AND EVENING IS HIGHLY DEPENDANT ON EVOLUTION OF MORINING CONVECTION AND CLOUD SHIELD. SFC FRONT WILL BE WELL TO THE NORTH IN KS BY 00Z SO NEW STORMS WILL LIKELY FIRE ON OUTFLOW BOUNDARY OR PSUEDO-WARM FRONT. MODELS HAVE BETTER SYNOPTIC / MESO-ALPHA SCALE LIFT IN NORTHERN ZONES SO HAVE HIGHER POPS THERE...BUT STRONGEST CONVECTION MAY STAY FURTHER SOUTH DEPENDING ON WHERE BOUNDAY ENDS UP. TYPES OF SEVERE WEATHER AND SUPERCCELL/TORNADO CHANCES AGAIN DEPENDANT ON MORNING EVOLUTION OF CONVECTION. THINK THAT DY1 OUTLOOK HAS GOOD ESTIMATION OF INSTABILITY BUT SR HELICITY MAY BE HIGHLY VARIABLE IN THE MESOSCALE...RANGING FROM 100 TO 300+ M2/S2. IF STRONG 0-1KM SLY WINDS CAN DEVELOP (WHICH REGIONAL MODELS ARE NOT PROGGING) COULD VERY WELL SEE SUPERCELLS AND VERY LARGE HAIL LATE THIS AFTERNOON AND EVENING. FRONT SHOULD FOLLOW STORMS EVENTUALLY REACHING NE OK AROUND 9Z AND NW AR/SE OK BETWEEN 12 AND 15Z MONDAY. TEMPS WILL FALL EVEN WITH MOSTLY SUNNY SKIES IN THE MORNING. ON MONDAY AFTERNOON CLOUDS SHOULD ROLL IN FROM THE NORTH AS ANOTHER S/W MOVES IN FROM THE NW. SHOULD BE STRONG ENOUGH LIFT WITH THE SECOND WAVE FOR LIGHT RAIN TO DEVELOP. HAVE KEPT SMALL POPS GOING INTO MON EVENING FOR ALL BUT FAR NW ZONES AS IT WILL TAKE SOME TIME FOR THIS WAVE TO MOVE OUT OF THE AREA. MONDAY NIGHT MINS LOOK LIKE THEY WILL STAY ABOVE RECORD LEVELS BUT NOT BY MUCH. SHOULD BE SOME LIGHT NW WINDS THAT WILL KEEP TEMPS UP THROUGH 9Z AT LEAST. EXTENDED PERIODS LOOK COOL AND DRY WITH A GRADUAL WARMING TREND AS LARGE UPR LOW CLOSES OFF OVER THE MIDWEST AND BLOCKS PROGRESSION OF L/W PATTERN. FCSTID = 26 TUL 82 57 62 46 / 60 50 40 20 FSM 84 64 69 49 / 60 70 50 30 MLC 85 61 64 46 / 60 60 40 20 BVO 80 55 60 41 / 70 60 40 10 FYV 80 58 62 40 / 60 80 50 40 BYV 80 58 62 40 / 60 80 50 40 MIO 80 57 62 42 / 70 80 50 30 MKO 83 59 62 47 / 60 60 40 20 F10 82 57 62 46 / 60 50 40 20 HHW 85 65 67 50 / 50 60 40 20 .TSA... AR...NONET. OK...NONE.
ARZ001-002-010-011-019-020-029-OKZ049-053>076-211100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 610 AM CDT SUN MAY 20 2001 ...A FEW SEVERE THUNDERSTORMS EXPECTED THIS AFTERNOON AND EVENING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... SURFACE LOW PRESSURE LOCATED IN WESTERN NEBRASKA AND ASSOCIATED TROUGH EXTENDING SOUTH INTO THE TEXAS PANHANDLE WILL CONTINUE TO MOVE SOUTHEAST TODAY. A STATIONARY FRONT ACROSS CENTRAL OKLAHOMA AND ARKANSAS WILL MOVE NORTH TODAY AS A WARM FRONT AS SOUTHERLY WINDS AHEAD OF TROUGH INCREASE. STRONG UPPER LEVEL WINDS WILL MOVE SEVERAL DISTURBANCES ACROSS THE SOUTHERN PLAINS TODAY. IN ADDITION...A COMPLEX OF THUNDERSTORMS WILL MOVE ACROSS THE AREA THIS MORNING WHICH WILL LEAVE BEHIND SEVERAL OUTFLOW BOUNDARIES FOR THUNDERSTORMS TO DEVELOP ALONG THIS AFTERNOON INTO THIS EVENING. .SPOTTER ACTIVATION... SPOTTER ACTIVATION WILL LIKELY BE REQUIRED THIS AFTERNOON INTO THE EVENING HOURS. .DISCUSSION... EARLY MORNING BAND OF CONVECTION WILL MOVE ACROSS EASTERN OKLAHOMA INTO WESTERN ARKANSAS BY MIDDAY. THIS WILL LEAVE BEHIND OUTFLOW BOUNDARIES FOR THIS AFTERNOON. FORECAST AFTERNOON SURFACE BASED CAPE VALUES OF 2000 TO 3500 J/KG ALONG WITH LIFTED INDEX VALUES TO -8 DEGREES WILL MAKE FOR A VERY UNSTABLE ATMOSPHERE. IN ADDITION...AN UPPER LEVEL DISTURBANCE WILL MOVE INTO THE AREA THIS AFTERNOON ACCOMPANIED BY AN 85 KT 300 MB JET. LOCATION OF CONVECTION IS STILL IN QUESTION AS FINAL LOCATION OF OUTFLOW BOUNDARIES WILL LIKELY BE DETERMINING FACTOR FOR CONVECTIVE INITIATION. LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE WITH STORMS THAT DO DEVELOP THIS AFTERNOON. AN ISOLATED TORNADO CAN NOT BE RULED OUT ALTHOUGH SURFACE WIND FIELDS WILL REMAIN IN QUESTION. FURTHER UPDATES THIS AFTERNOON WILL PROVIDE ADDITIONAL FOCUS ON THIS CONVECTIVE SITUATION. THREAT TABLE VALID THROUGH 1200 UTC MONDAY AREA 1...MUCH OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THUNDERSTORM PROBABILITY...70 SEVERE PROBABILITY IF STORMS OCCUR...90 SIGNIFICANT SEVERE PROBABILITY IF STORMS OCCUR...30 THREAT AREAS DEFINE THE GREATEST RISK. PROBABILITIES ARE IN PERCENT. SIGNIFICANT SEVERE IS DEFINED AS F1 OR GREATER WIND/TORNADO DAMAGE AND /OR GOLFBALL SIZE HAIL OR LARGER. RELATED GRAPHICAL INFORMATION CAN BE FOUND AT: WWW.SRH.NOAA.GOV/TULSA w AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AROUND 1 PM TODAY.
The Western Arkansas radar (KSRX), 48 km away, was scanning. The volume nearest the first event began at 13:47 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew the roofs off of several outbuildings and also blew down several trees.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oklahoma in 2001Every state in 2001This day in weather historyWarnings in Oklahoma, May 2001
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5246045.