Scattered strong to severe storms formed along a front moving into northwest Oklahoma on the 20th. Heavy rains also produced some flash flooding.
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 episode as NWS OUN wrote it up.
Scattered strong to severe storms formed along a front moving into northwest Oklahoma on the 20th. Heavy rains also produced some flash flooding.
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 Norman, OK wrote its last area forecast discussion before the first event at Jul 20, 2:34 PM CST, 1 hour 51 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
334 PM CDT MON JUL 20 2015
.DISCUSSION...
A WEAK SURFACE BOUNDARY EXTENDED ROUGHLY ALONG I-40 THIS
AFTERNOON. CONVERGENCE ALONG THIS BOUNDARY HAS ALREADY PRODUCED A
FEW THUNDERSTORMS...AND ADDITIONAL STORMS HAVE FORMED FARTHER
NORTH. FOR THE MOST PART...FLOW IS WEAK...AND INSTABILITY IS
MODERATE...SO STORMS WILL BE SLOW TO MOVE...AND WILL MAINLY POSE A
THREAT OF STRONG WINDS AND HEAVY RAIN...AND OF COURSE LIGHTNING.
WITH LITTLE CHANGE IN THE SURFACE SITUATION...AND WEAK
DISTURBANCES ALOFT PASSING OVERHEAD...ADDITIONAL SHOWERS AND
STORMS ARE EXPECTED TO DEVELOP PERIODICALLY THROUGH WEDNESDAY.
MORE SIGNIFICANT STORMS ARE LIKELY HERE IF STORMS CAN GET
ORGANIZED FARTHER WEST...OR OVER CENTRAL/WESTERN OKLAHOMA. WITH
THE WEAK WIND FIELDS...THIS IS UNLIKELY...BUT IT IS NOT
IMPOSSIBLE.
AFTER MIDWEEK...THE UPPER-LEVEL RIDGE REASSERTS ITS DOMINANCE IN
OUR WEATHER...AND THE BRIEF BREAK FROM THE HEAT WILL BE OVER. HIGH
TEMPERATURES AND MODERATE TO HIGH HUMIDITY WILL RETURN FOR THE
REMAINDER OF THE FORECAST PERIOD...WITH LITTLE OR NO ADDITIONAL
RAIN.
THE EXISTING HEAT ADVISORY WILL REMAIN IN EFFECT THROUGH 8
PM...BUT WE DO NOT EXPECT HEAT/HUMIDITY COMBINATIONS TO WARRANT A
CONTINUATION OF THE ADVISORY INTO TOMORROW. HOWEVER...CONDITIONS
PROBABLY WILL SUPPORT MORE ADVISORIES LATER THIS WEEK.
&&
.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK 74 90 73 93 / 60 40 50 20
HOBART OK 73 94 73 97 / 40 50 40 10
WICHITA FALLS TX 76 98 77 98 / 10 10 20 10
GAGE OK 69 83 67 91 / 60 60 60 20
PONCA CITY OK 74 85 70 88 / 60 50 60 40
DURANT OK 76 97 76 96 / 10 10 10 10
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...HEAT ADVISORY UNTIL 8 PM CDT THIS EVENING FOR OKZ013-018>020-
024>032-039>043-045>048-050>052.
TX...NONE.
&&
25/23HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NORMAN OK 1153 AM CDT MON JUL 20 2015 OKZ004>048-050>052-TXZ083>090-211700- HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD- NOBLE-ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE- BECKHAM-WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN- CLEVELAND-POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON- TILLMAN-COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON- JEFFERSON-CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN- FOARD-WILBARGER-WICHITA-KNOX-BAYLOR-ARCHER-CLAY- 1153 AM CDT MON JUL 20 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN... WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... .HEAT... TODAY WILL BE ANOTHER HOT AND HUMID DAY WITH HEAT INDEX VALUES REACHING 100 TO 108 ACROSS MUCH OF OKLAHOMA AND NORTH TEXAS. .THUNDERSTORMS... SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS MAINLY NORTHERN AND CENTRAL OKLAHOMA THIS AFTERNOON AND TONIGHT. THUNDERSTORMS WILL DEVELOP THIS AFTERNOON IN PARTS OF NORTHERN OKLAHOMA AND THEN BECOME MORE WIDESPREAD ACROSS NORTHERN AND CENTRAL OKLAHOMA THIS EVENING AND OVERNIGHT. SOME OF THESE STORMS MAY BECOME STRONG TO SEVERE LATE THIS AFTERNOON AND THIS EVENING. THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS MAINLY ALONG AND NORTH OF A LINE FROM HOLLIS AND HOBART... TO NORMAN AND SHAWNEE. THESE STORMS MAY PRODUCE HAIL UP TO THE SIZE OF HALF DOLLARS AND WINDS OF 60 TO 70 MPH. THE POTENTIAL FOR SEVERE STORMS WILL DIMINISH AFTER SUNSET BUT THUNDERSTORMS WILL REMAIN POSSIBLE INTO TUESDAY MORNING. CLOUD TO GROUND LIGHTNING AND HEAVY DOWNPOURS WILL BE THE MAIN CONCERNS OVERNIGHT INTO THE MORNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... .HEAT... HOT WEATHER WILL CONTINUE THROUGH THE WEEK... WITH THE EXCEPTION OF A BRIEF PERIOD OF SOMEWHAT COOLER WEATHER IN NORTHERN AND CENTRAL OKLAHOMA ON TUESDAY AND WEDNESDAY AS A COLD FRONT MOVES INTO THE AREA. HOWEVER... HOT WEATHER WILL REMAIN SOUTH OF THE FRONT AND SPREAD BACK ACROSS THE ENTIRE AREA BY THURSDAY. MAXIMUM AFTERNOON HEAT INDEX VALUES IN THE TRIPLE DIGITS WILL BE COMMON. .THUNDERSTORMS... SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED AGAIN TUESDAY AND WEDNESDAY WITH THE HIGHEST CHANCES OF STORMS ACROSS NORTHERN OKLAHOMA. STRONG TO MARGINALLY SEVERE STORMS WILL BE POSSIBLE AGAIN ACROSS THE NORTHERN HALF OF OKLAHOMA ON TUESDAY. GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
342 PM CDT MON JUL 20 2015
OKZ021-202130-
BECKHAM OK-
342 PM CDT MON JUL 20 2015
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BECKHAM COUNTY UNTIL 430
PM CDT...
AT 339 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 6 MILES NORTHWEST
OF DELHI...MOVING EAST AT 10 MPH.
HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...
FREQUENT CLOUD TO GROUND LIGHTNING...
LOCATIONS IMPACTED INCLUDE...
SAYRE...ERICK...CARTER AND DELHI.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE WEATHER IS NOT EXPECTED AND NO WARNINGS ARE ANTICIPATED AT
THIS TIME.
&&
LAT...LON 3534 9994 3538 9948 3512 9949 3512 9955
3515 9994
TIME...MOT...LOC 2039Z 270DEG 10KT 3525 9975
MBSSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 359 PM CDT MON JUL 20 2015 OKZ014-021-202130- ROGER MILLS OK-BECKHAM OK- 359 PM CDT MON JUL 20 2015 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL ROGER MILLS AND NORTHWESTERN BECKHAM COUNTIES UNTIL 430 PM CDT... AT 359 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 9 MILES EAST OF SWEETWATER...MOVING SOUTH AT 5 MPH. HAZARDS INCLUDE... WIND GUSTS TO 50 MPH... MINOR FLOODING IN AREAS OF POOR DRAINAGE... FREQUENT CLOUD TO GROUND LIGHTNING... LOCATIONS IMPACTED INCLUDE... BERLIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. && LAT...LON 3551 9982 3553 9956 3534 9956 3534 9988 TIME...MOT...LOC 2056Z 16DEG 3KT 3544 9975 MBS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
412 PM CDT MON JUL 20 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM TSTM WND DMG 5 WNW CALUMET 35.63N 98.20W
07/20/2015 CANADIAN OK PUBLIC
TIME ESTIMATED FROM RADAR.
&&
MDAYSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 429 PM CDT MON JUL 20 2015 OKZ018-024-202215- CANADIAN OK-KINGFISHER OK- 429 PM CDT MON JUL 20 2015 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CANADIAN AND SOUTH CENTRAL KINGFISHER COUNTIES UNTIL 515 PM CDT... AT 429 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTH OF CALUMET...MOVING EAST AT 10 MPH. HAZARDS INCLUDE... POTENTIALLY SEVERE WINDS GUSTING OVER 55 MPH... FREQUENT CLOUD TO GROUND LIGHTNING... PRECAUTIONARY/PREPAREDNESS ACTIONS... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. && LAT...LON 3560 9819 3573 9819 3578 9788 3555 9787 TIME...MOT...LOC 2129Z 280DEG 7KT 3568 9814
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 436 PM CDT MON JUL 20 2015 OKZ021-022-202215- BECKHAM OK-WASHITA OK- 436 PM CDT MON JUL 20 2015 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BECKHAM AND NORTHWESTERN WASHITA COUNTIES UNTIL 515 PM CDT... AT 435 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR ELK CITY... MOVING EAST AT 10 MPH. HAZARDS INCLUDE... POTENTIALLY SEVERE WINDS GUSTING OVER 55 MPH... FREQUENT CLOUD TO GROUND LIGHTNING... PRECAUTIONARY/PREPAREDNESS ACTIONS... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. && LAT...LON 3532 9956 3546 9952 3546 9929 3527 9930 TIME...MOT...LOC 2135Z 276DEG 8KT 3537 9945
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 457 PM CDT MON JUL 20 2015 OKZ016-017-022-023-202300- CADDO OK-CUSTER OK-BLAINE OK-WASHITA OK- 457 PM CDT MON JUL 20 2015 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CADDO...SOUTHEASTERN CUSTER...SOUTHWESTERN BLAINE AND NORTHEASTERN WASHITA COUNTIES UNTIL 600 PM CDT... AT 454 PM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER WEATHERFORD... MOVING SOUTHEAST AT 5 MPH. HAZARDS INCLUDE... POTENTIALLY SEVERE WINDS GUSTING OVER 55 MPH... PRECAUTIONARY/PREPAREDNESS ACTIONS... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. && LAT...LON 3550 9885 3566 9872 3562 9851 3540 9862 TIME...MOT...LOC 2154Z 296DEG 5KT 3554 9871
The Norman radar (KTLX), 135 km away, was scanning. The volume nearest the first event began at 22:27 UTC.
3 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Three power poles downed by strong winds. Time estimated from radar.
Power lines downed by strong winds.
Carport pulled down by strong winds. Time estimated from radar.
Roads were flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oklahoma in 2015Every state in 2015This day in weather historyWarnings in Oklahoma, July 2015
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: 592304, 592305, 592306, 592308.