A cluster of severe thunderstorms, with embedded supercells, developed over central Missouri and moved southward across eastern portions of the Springfield County Warning Area. The thunderstorms produced severe winds up to 60mph, baseball size hail and heavy rainfall.
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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 SGF wrote it up.
A cluster of severe thunderstorms, with embedded supercells, developed over central Missouri and moved southward across eastern portions of the Springfield County Warning Area. The thunderstorms produced severe winds up to 60mph, baseball size hail and heavy rainfall.
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 Springfield, MO wrote its last area forecast discussion before the first event at Jul 11, 1:47 AM CST, 43 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SPRINGFIELD MO 247 AM CDT SAT JUL 11 2009 .DISCUSSION... ONCE AGAIN...SHOWERS AND THUNDERSTORMS DEVELOPED WITHIN A REGION OF ENHANCED ISENTROPIC PRESSURE ADVECTION OVER EASTERN KANSAS AND WESTERN MISSOURI. THIS TIGHT ZONE OF BAROCLINICITY CAN BE VIEWED ALONG THE 315 K POTENTIAL TEMPERATURE SURFACE. PARCELS CONTINUE TO ADVECT UP THIS STEEP INCLINE AT A NEAR PERPENDICULAR ANGLE...ALLOWING THEM TO REACH A LEVEL OF FREE CONVECTION ABOVE A THICK LAYER OF LOW LEVEL CONVECTIVE INHIBITION. CLOUD COVER AND PRECIPITATION ASSOCIATED WITH THIS CONVECTION WILL HAVE IMPACTS ON TEMPERATURES TODAY. REGARDING YESTERDAY...CLOUD COVER CONFINED AFTERNOON HIGHS IN THE 80S IN MOST LOCATIONS OF THE MISSOURI OZARKS. HOWEVER...JOPLIN AND THE REST OF SOUTHEAST KANSAS ALL APPROACHED 100 DEGREES. TODAY MAY BE SLIGHTLY DIFFERENT AS ONGOING CLOUD COVER AND CONVECTION ARE POSITIONED FURTHER SOUTH AND WEST...WHICH WILL LIKELY KEEP SOUTHEAST KANSAS AND FAR WESTERN MISSOURI POSSIBLY 5 TO 10 DEGREES COOLER TODAY COMPARED TO YESTERDAY. AS FOR RAIN CHANCES...THE MAJORITY OF THE CWA COULD EXPERIENCE MEASURABLE RAINFALL TODAY...HOWEVER...THE BEST COVERAGE WILL LIKELY OCCUR OVER CENTRAL MISSOURI. THE REASON FOR FOCUSING POPS OVER CENTRAL MISSOURI IS DUE TO THE MOVEMENT OF THE PREVIOUSLY MENTIONED 315K BAROCLINIC ZONE. MODELS SUGGEST AN EASTWARD PROGRESSION INTO THE DAYTIME HOURS...CAUSING THE BEST LIFT OVER THE LAKE OF THE OZARKS REGION/EASTERN OZARKS. PULSE LIKE THUNDERSTORMS ARE UNLIKELY TODAY GIVEN THE STOUT CAP THAT HAS SPREAD INTO THE OZARKS AIRMASS. TONIGHT COULD BE ANOTHER REPEAT AS MODELS SHOW CONVECTION DEVELOPING ON THE NORTHEAST PERIPHERY OF THE SUMMERTIME HIGH. HOWEVER...THE LATEST INDICATIONS SUGGEST THAT TONIGHTS CONVECTION WILL LIKELY DEVELOP FURTHER TO THE NORTHEAST...WHICH MAY CAUSE HEAT ADVISORY LIKE CONDITIONS OVER SE KANSAS AND PARTS OF WESTERN MISSOURI FOR SUNDAY. AS FOR THE REST OF THE EXTENDED FORECAST...NOT MUCH CHANGE OCCURS WITH THE OVERALL PATTERN. THE SUMMERTIME HIGH MAINTAINS POSITION OVER THE SOUTHERN PLAINS OF WEST TEXAS AND EASTERN NEW MEXICO. THIS LEAVES OUR REGION ALONG THE PERIPHERY OF THE HIGH...AND IN A FAVORABLE REGION FOR NOCTURNAL CONVECTION ON ANY GIVEN NIGHT. CRAMER && .AVIATION... ANOTHER CLUSTER OF THUNDERSTORMS WILL DEVELOP OVERNIGHT FROM EASTERN KANSAS INTO CENTRAL MISSOURI. THIS ACTIVITY SHOULD THEN BEGIN TO MOVE SOUTHEAST DURING THE LATE NIGHT AND EARLY MORNING HOURS. IT IS STILL TOUGH TO TELL IF THESE STORMS WILL IMPACT KSGF. DECIDED TO GO WITH CB GROUP FOR NOW. DID NOT INCLUDE CB GROUP FOR KJLN AS ACTIVITY SHOULD REMAIN TO THE NORTH AND EAST. OTHERWISE...VFR CONDITIONS WILL CONTINUE INTO SATURDAY EVENING. DID INCLUDE WIND SHEAR IN THE TAFS INTO EARLY SATURDAY MORNING AS A LOW LEVEL JET VEERS OVER THE AREA. SCHAUMANN && .SGF WATCHES/WARNINGS/ADVISORIES... MO...NONE. KS...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SPRINGFIELD MO 1052 PM CDT FRI JUL 10 2009 KSZ073-097-101-MOZ055>058-066>071-077>083-088>098-101>106-111200- BOURBON-CRAWFORD-CHEROKEE-BENTON-MORGAN-MILLER-MARIES-VERNON- ST. CLAIR-HICKORY-CAMDEN-PULASKI-PHELPS-BARTON-CEDAR-POLK-DALLAS- LACLEDE-TEXAS-DENT-JASPER-DADE-GREENE-WEBSTER-WRIGHT-NEWTON- LAWRENCE-CHRISTIAN-DOUGLAS-HOWELL-SHANNON-MCDONALD-BARRY-STONE- TANEY-OZARK-OREGON- 1052 PM CDT FRI JUL 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE MISSOURI OZARKS AND EXTREME SOUTHEAST KANSAS. .DAY ONE...TONIGHT. SCATTERED THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE OVERNIGHT ACROSS THE ENTIRE OUTLOOK AREA. THE BEST CHANCE FOR STORMS WILL GENERALLY BE NORTH OF HIGHWAY 60 AS A LOW LEVEL JET INTERACTS WITH AN UNSTABLE AIRMASS. ENOUGH WIND SHEAR EXISTS FOR A FEW STRONG TO SEVERE STORMS. WIND GUSTS TO 60 MPH...HAIL TO THE SIZE OF QUARTERS...AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH ANY STRONGER STORMS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. PERIODIC THUNDERSTORM DEVELOPMENT WILL BE POSSIBLE THIS WEEKEND THROUGH EARLY NEXT WEEK...THOUGH EXACT TIMING OF THESE THUNDERSTORMS REMAINS UNCERTAIN. HEAT INDEX VALUES AROUND 100 DEGREES WILL BE POSSIBLE EACH AFTERNOON FROM THIS WEEKEND INTO EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT. && THIS PRODUCT IS NOW AVAILABLE IN GRAPHICAL FORMAT...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND CLIMATE INFORMATION...AT HTTP://WWW.CRH.NOAA.GOV/SGF(ALL LOWERCASE) SCHAUMANN
The Pleasant Hill radar (KEAX), 72 km away, was scanning. The volume nearest the first event began at 08:30 UTC.
13 hail, 9 thunderstorm wind, 1 lightning, 1 flash flood. Local standard time, as filed.
Severe thunderstorm winds caused power outages, downed trees and scattered loose outdoor items across portions of the city.
Severe thunderstorm winds downed numerous trees. Additional reports of downed tress and a 100 foot tall amateur radio tower, all laying to the east, occurred east of Dederick. Law enforcement reported minor damage to three homes occurred when trees fell on the homes.
Severe thunderstorm winds downed trees and snapped power poles in a community northeast of Ozark. Penny size hail also damaged siding.
Severe thunderstorm winds downed power lines along County Road 607 south of Highway 42.
A lightning strike damage the radio service and phone lines at the Missouri State Highway Patrol Troop G Headquarters.
Severe thunderstorm winds downed a large tree which fell on a trailer home.
A barn along Highway W suffered roof damage.
Severe thunderstorm wind gusts downed several trees in a rural area along Highway 19, between Alton and Thayer.
A few store awnings were damaged from severe thunderstorm wind gusts. Numerous trees and limbs were downed by the winds with at least one SUV damaged when a large tree fell on it. These severe wind gusts also snapped six power poles along Highway 160 and downed the broadcast tower of K38HE TV within the city limits.
Law enforcement officers estimated wind gusts at 60 mph.
Heavy rainfall from a slow moving thunderstorm produced flooding across Highway A near the intersection of Highway 19 west of the town of Couch.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2009Every state in 2009This day in weather historyWarnings in Missouri, 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: 188360, 188362, 188363, 188371, 187413, 187414, 187415, 188364, 187416, 190179, 188365, 187417, 190178, 187423, 187419, 187418, 187422, 187420, 188366, 188367, 188368, 188433, 188372, 187421.