Thunderstorms developed ahead of a slow moving outflow boundary that was located near the Red River by early evening. Heavy rain and gusty winds were common in the thunderstorms, but one tstorm caused damage to outbuildings and power lines near Knox City.
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.
Thunderstorms developed ahead of a slow moving outflow boundary that was located near the Red River by early evening. Heavy rain and gusty winds were common in the thunderstorms, but one tstorm caused damage to outbuildings and power lines near Knox City.
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 4, 5:47 PM CST, 14 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 647 PM CDT SAT JUL 4 2009 .AVIATION... /00Z TAFS/ A SERIES OF T-STORM OUTFLOW BOUNDARIES AND A TRAILING COLD FRONT OVER CENTRAL AND SOUTHERN OK INTO WESTERN NORTH TX WILL ADVANCE SOUTH OVERNIGHT. SHOWERS AND T-STORMS WILL CONTINUE TO OCCUR NEAR AND SOUTH OF THE BOUNDARIES/FRONT WITH A GENERAL PROGRESSION ALSO TO THE SOUTH. TERMINALS GENERALLY ALONG AND SOUTH OF THE INTERSTATE 40 CORRIDOR WILL BE MOST AFFECTED BY THE STORMS. OCCASIONAL VFR CEILINGS EXPECTED ON SUNDAY. && .PREV DISCUSSION... /ISSUED 306 PM CDT SAT JUL 4 2009/ DISCUSSION... OUTFLOW BOUNDARY BECOMING STATIONARY ACROSS SOUTHWEST INTO SOUTH- CENTRAL OKLAHOMA AND IS STARTING TO LIGHT UP WITH SCATTERED STORMS. COLD FRONT ACROSS NORTHWEST AND NORTH-CENTRAL OKLAHOMA MAY SEE MORE ISOLATED CONVECTION...BUT MOST WIDESPREAD ACTIVITY EXPECTED WHEN BOUNDARIES MERGE THIS EVENING AND WEAK FORCING FROM EASTERN NEW MEXICO AND WEST TEXAS IMPACTS ELEVATED BOUNDARIES. MOST OF THIS CONVECTION SHOULD BE WELL SOUTH OF INTERSTATE-40...BUT CONFIDENCE NOT REAL HIGH HOW FAR NORTH SCATTERED TO NUMEROUS SHOWERS AND STORMS WILL EXTEND OF SURFACE FEATURES. WILL LEAVE HIGHEST POPS NEAR AND SOUTH OF INTERSTATE 40 AND CONSIDERED GOING EVEN HIGHER ALONG RED RIVER VALLEY TOWARD AND AFTER MIDNIGHT. HEAVY RAIN COULD BE AN ISSUE LATER ON TONIGHT AND THERE WILL CONTINUE TO BE A MARGINAL HAIL AND DAMAGING WIND THREAT THROUGH EARLY EVENING. BEFORE MID-UPPER LEVEL RIDGE BUILDS IN OVER THE REGION EARLY TO MID NEXT WEEK...WE COULD SEE SOME NORTHWEST FLOW ACTIVITY AFFECT FAR WESTERN OKLAHOMA AND PARTS OF NORTH TEXAS THROUGH AT LEAST MONDAY MORNING. QUITE HOT BY LATE NEXT WEEK INTO NEXT WEEKEND WITH UPPER RIDGE OVER OR JUST NORTH OF OKLAHOMA. GFS GRIDDED DATA GENERALLY ACCEPTED WITH FIRST PERIOD TWEAKS. && .PRELIMINARY POINT TEMPS/POPS... OKLAHOMA CITY OK 71 90 67 91 / 60 10 10 10 HOBART OK 73 93 67 91 / 60 20 20 20 WICHITA FALLS TX 75 91 69 91 / 70 60 10 20 GAGE OK 65 87 63 87 / 20 10 20 20 PONCA CITY OK 69 86 63 90 / 20 0 10 10 DURANT OK 75 90 69 89 / 70 40 10 10 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...NONE. TX...NONE. && 25/11/32
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1150 AM CDT SAT JUL 4 2009
OKZ004>048-050>052-TXZ083>090-051200-
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-
1150 AM CDT SAT JUL 4 2009
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...THROUGH TONIGHT...
THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING ACROSS PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.
LOCATION...
THE SLIGHT RISK AREA IS GENERALLY SOUTH OF A LINE FROM PERRY TO
ENID... TO TALOGA AND CHEYENNE... AND INCLUDES ALL OF WESTERN NORTH
TEXAS.
TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM
MID-AFTERNOON THROUGH THE EVENING HOURS. ISOLATED SEVERE
THUNDERSTORMS WILL STILL BE POSSIBLE AFTER MIDNIGHT.
RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR POSSIBLE SEVERE WEATHER OPERATIONS THIS
AFTERNOON AND EVENING.
DISCUSSION...
A FEW LINGERING SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT
PORTIONS OF NORTHERN AND CENTRAL OKLAHOMA EARLY THIS AFTERNOON.
INITIALLY...SEVERE WEATHER IS NOT ANTICIPATED WITH THIS ACTIVITY.
HOWEVER...MULTIPLE SURFACE BOUNDARIES FROM EARLIER CONVECTION...
ALONG WITH A SURFACE COLD FRONT MOVING THROUGH NORTHERN AND WESTERN
OKLAHOMA THIS AFTERNOON...WILL SERVE AS A SOURCE OF CONVERGING WINDS
FOR THUNDERSTORM DEVELOPMENT THIS AFTERNOON.
AHEAD OF THE FRONT...TEMPERATURES WILL CLIMB INTO THE 90S ACROSS
MUCH OF OKLAHOMA WITH TRIPLE DIGIT TEMPERATURES EXPECTED ACROSS
PORTIONS OF SOUTHERN OKLAHOMA AND NORTH TEXAS. THIS HOT WEATHER
WILL CREATE AN ATMOSPHERE WITH MODERATELY HIGH INSTABILITY...AND AN
ENVIRONMENT THAT WILL SUPPORT THE POTENTIAL FOR ISOLATED AREAS OF
DAMAGING THUNDERSTORM WINDS. HAIL JUST ABOVE SEVERE LEVELS WILL ALSO
BE POSSIBLE WITH THE STRONGEST STORMS.
THUNDERSTORMS WILL CONTINUE OVERNIGHT AS THE COLD FRONT CONTINUES TO
MOVE SOUTH THROUGH OKLAHOMA AND NORTH TEXAS... BUT INSTABILITY WILL
DECREASE OVERNIGHT PRODUCING LOWER CHANCES OF SEVERE WEATHER.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY JUL 5.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60 PERCENT.
OTHER HAZARDOUS WEATHER...
TEMPERATURES AROUND 100 AND HEAT INDICES OF 100 TO 105 WILL BE
POSSIBLE OVER FAR SOUTHERN OKLAHOMA AND NORTH TEXAS. IF YOU ARE OUT
THIS AFTERNOON AND EARLY EVENING...DRINK PLENTY OF WATER AND TAKE
FREQUENT BREAKS FROM THE SUN.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...
THUNDERSTORM OUTLOOK...
THUNDERSTORM CHANCES WILL PERSIST INTO TUESDAY... MAINLY ACROSS
PORTIONS OF SOUTHERN AND WESTERN OKLAHOMA AND WESTERN NORTH TEXAS.
SEVERE WEATHER CHANCES WILL BE LOW.
OTHER HAZARDOUS WEATHER...
WITH A DEEP LAYER OF WARM AIR EXPECTED TO BECOME ESTABLISHED OVER
THE SOUTHERN PLAINS FROM MID-WEEK THROUGH FRIDAY...HOT TEMPERATURES
AND ASSOCIATED HIGH HEAT INDICES ARE EXPECTED.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
SUNDAY.SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 600 PM CDT SAT JUL 4 2009 OKZ017-018-024-042330- BLAINE OK-KINGFISHER OK-CANADIAN OK- 600 PM CDT SAT JUL 4 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR BLAINE...CANADIAN AND KINGFISHER COUNTIES. A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 3 MILES SOUTHEAST OF GEARY TO 5 MILES SOUTHWEST OF EL RENO AT 600 PM CDT...MOVING EAST AT 20 MPH. SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE. PEOPLE IN BLAINE...CANADIAN AND KINGFISHER COUNTIES...INCLUDING THE CITIES OF EL RENO AND OKLAHOMA CITY...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 620 PM CDT SAT JUL 4 2009 OKZ037-038-044-TXZ083>086-042345- COTTON OK-TILLMAN OK-COMANCHE OK-HARDEMAN TX-WILBARGER TX-FOARD TX- WICHITA TX- 620 PM CDT SAT JUL 4 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR COMANCHE...COTTON...FOARD... HARDEMAN...TILLMAN...WICHITA AND WILBARGER COUNTIES. A GUST FRONT WELL AHEAD OF SCATTERED STRONG THUNDERSTORMS WAS LOCATED FROM 3 MILES NORTHWEST OF CACHE TO 13 MILES NORTHWEST OF COPPER BREAKS STATE PARK AT 619 PM CDT...MOVING SOUTHEAST AT 30 MPH. WIND GUSTS AROUND 50 MPH ARE POSSIBLE. PEOPLE IN COMANCHE...COTTON...FOARD...HARDEMAN...TILLMAN...WICHITA AND WILBARGER COUNTIES...INCLUDING THE CITIES OF LAWTON AND VERNON... SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
632 PM CDT SAT JUL 04 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0620 PM HAIL YUKON 35.51N 97.75W
07/04/2009 E0.75 INCH CANADIAN OK PUBLIC
&&
FMSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 633 PM CDT SAT JUL 4 2009 OKZ014-016-021-042345- ROGER MILLS OK-CUSTER OK-BECKHAM OK- 633 PM CDT SAT JUL 4 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...CUSTER AND ROGER MILLS COUNTIES. A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 6 MILES SOUTHEAST OF CUSTER CITY TO 4 MILES NORTH OF DEMPSEY AT 633 PM CDT...MOVING EAST SOUTHEAST AT 20 MPH. SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE... ALONG WITH VERY HEVY RAIN AND FREQUENT LIGHTNING. PEOPLE IN BECKHAM...CUSTER AND ROGER MILLS COUNTIES...INCLUDING THE CITIES OF CLINTON AND WEATHERFORD...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS. 30
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 644 PM CDT SAT JUL 4 2009 OKZ027-028-050015- GRADY OK-MCCLAIN OK- 644 PM CDT SAT JUL 4 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR GRADY AND MCCLAIN COUNTIES. A STRONG THUNDERSTORM EXTENDING FROM 3 MILES NORTHEAST OF CHICKASHA TO 3 MILES WEST OF ALEX AT 643 PM CDT...WAS MOVING EAST AT 25 MPH. ALONG WITH VERY HEAVY RAIN AND FREQUENT CLOUD TO GROUND LIGHTNING...SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE. PEOPLE IN GRADY AND MCCLAIN COUNTIES...INCLUDING THE CITY OF CHICKASHA...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 652 PM CDT SAT JUL 4 2009 OKZ019-024-025-029-050015- LOGAN OK-CANADIAN OK-OKLAHOMA OK-CLEVELAND OK- 652 PM CDT SAT JUL 4 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR CANADIAN...CLEVELAND...LOGAN AND OKLAHOMA COUNTIES. A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM NEAR PIEDMONT TO CENTRAL OKLAHOMA CITY AT 652 PM CDT...MOVING EAST AT 20 MPH. ALONG WITH TORRENTIAL RAINFALL AND FREQUENT CLOUD TO GROUND LIGHTNING...SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE. PEOPLE IN CANADIAN...CLEVELAND...LOGAN AND OKLAHOMA COUNTIES... INCLUDING THE CITIES OF DEL CITY...EDMOND...MIDWEST CITY AND OKLAHOMA CITY...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS.
The Dyess AFB radar (KDYX), 111 km away, was scanning. The volume nearest the first event began at 00:05 UTC.
1 thunderstorm wind. Local standard time, as filed.
Several power lines were downed, with damage also reported to outbuildings and a tin roof. Monetary damage estimates were not available.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2009Every state in 2009This day in weather historyWarnings in Texas, July 2009
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: 170231.