A few areas received heavy rain that caused isolated 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 LSX wrote it up.
A few areas received heavy rain that caused isolated 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 St. Louis, MO wrote its last area forecast discussion before the first event at Aug 22, 2:58 AM CST, 8 hours 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 358 AM CDT SAT AUG 22 2015 .SHORT TERM: (THROUGH LATE THIS AFTERNOON) ISSUED AT 358 AM CDT SAT AUG 22 2015 SHRA HAVE BEGUN TO DEVELOP ALONG AN AXIS OF MOISTURE CONVERGENCE AND AHEAD OF A S/W SWEEPING THRU THE AREA. EXPECT AREA OF TSRA TO CONTINUE TO MOVE ENEWD THRU THE REGION TODAY. THESE TSRA SHUD GRADUALLY DISSIPATE THIS AFTERNOON AS FORCING DECREASES. PRECIP MAY LINGER ACROSS SRN PORTIONS OF THE CWA WHERE SFC FORCING IS A LITTLE STRONGER. CONTINUED WARMER TEMPS FOR TODAY. TEMPS ARE EXPECTED TO BE SLOW TO WARM DUE TO CLOUD COVER AND PRECIP. HOWEVER, AS THE THERMAL RIDGE BUILDS INTO THE AREA AS THE PRECIP COMES TO AN END, EXPECT TEMPS TO WARM QUICKLY. TILLY .LONG TERM: (TONIGHT THROUGH FRIDAY) ISSUED AT 358 AM CDT SAT AUG 22 2015 RAIN CHANCES CONTINUE TONIGHT...THEN END FROM WEST TO EAST ON SUNDAY. THERE WILL BE SOME UNCERTAINTY ON THUNDERSTORM COVERAGE EARLY THIS EVENING WITH MUCH OF THE UPPER LEVEL SUPPORT FROM EARLIER TODAY HAVING MOVING OFF TO THE EAST...BUT DIURNAL INFLUENCES AND A SURFACE FRONTAL BOUNDARY STILL TO THE SOUTHWEST MAY STILL BE ENOUGH TO SUPPORT ISOLATED COVERAGE AND HAVE LEFT SLIGHT CHANCE POPS IN TO BEGIN TONIGHT. MORE ORGANIZED...AND LIKELY SOME STRONG TO SEVERE...CONVECTION IS EXPECTED TO DEVELOP UPSTREAM THIS EVENING WITH AN UPPER LEVEL IMPULSE AND NEW SURFACE COLD FRONT...AND WILL SURGE SOUTHEASTWARD TOWARDS OUR REGION. MUCH OF THE MODEL GUIDANCE SUPPORTS THIS CONVECTION WEAKENING AS IT MOVES IN LATER THIS EVENING AND OVERNIGHT...BUT PER SPC OUTLOOK...SOME STRONG AND ISOLATED SEVERE IS POSSIBLE SHORTLY UPON ARRIVAL LATE THIS EVENING. COVERAGE OF RAIN LOOKS TO BREAK UP TOWARDS DAYBREAK AND CONTINUE INTO SUNDAY MORNING...WITH SOME REFIRING ALONG ANTICIPATED LOCATION OF SURFACE COLD FRONT SUNDAY AFTERNOON SOUTHEAST OF STL METRO. AFTER THIS...RAIN CHANCES LOOK VERY MEAGER FOR THE REMAINDER OF THIS WEEK UNTIL NEXT WEEKEND...WITH NW FLOW ALOFT AND ABSENCE OF ANY CLEAR DISTURBANCES OR FRONTS. THE OTHER BIG STORY WILL BE THE PROLONGED STRETCH OF BELOW AVERAGE TEMPS FOR MUCH OF THIS WEEK...WITH MAXES IN THE UPPER 70S-NEAR 80 AND MINS IN THE 50S. TES && .AVIATION: (FOR THE 06Z TAFS THROUGH 06Z SATURDAY NIGHT) ISSUED AT 1034 PM CDT FRI AUG 21 2015 SURFACE RIDGE CONTINUES TO MOVE OFF TO THE EAST WITH LOW LEVEL MOISTURE ON THE INCREASE. SC HAS DEVELOPED OVER SOUTHWESTERN MISSOURI AND CONTINUES TO ADVECT NORTHWARD TOWARDS FORECAST AREA. LOW END VFR DECK TO MOVE INTO KCOU BY 06Z SATURDAY THEN INTO REST OF TAF SITES TOWARDS DAYBREAK. AS FOR PRECIPITATION CHANCES, WILL SEE ACTIVITY DEVELOP OVER CENTRAL MO AND TRACK TO THE EAST. STILL HARD TO PIN DOWN COVERAGE AND IF IT WILL MAKE IT INTO STL METRO AREA, SO KEPT VCTS MENTION FOR NOW. ACTIVITY TO DIMINISH BY MID MORNING SATURDAY. OTHERWISE, WINDS TO PERSIST FROM THE SOUTHEAST TO SOUTH. SPECIFICS FOR KSTL: SURFACE RIDGE CONTINUES TO MOVE OFF TO THE EAST WITH LOW LEVEL MOISTURE ON THE INCREASE. SC HAS DEVELOPED OVER SOUTHWESTERN MISSOURI AND CONTINUES TO ADVECT NORTHWARD TOWARDS FORECAST AREA. LOW END VFR DECK TO MOVE INTO KSTL BY 10Z SATURDAY. AS FOR PRECIPITATION CHANCES, WILL SEE ACTIVITY DEVELOP OVER CENTRAL MO AND TRACK TO THE EAST. STILL HARD TO PIN DOWN COVERAGE AND IF IT WILL MAKE IT INTO STL METRO AREA, SO KEPT VCTS MENTION FOR NOW AFTER 14Z SATURDAY. ACTIVITY TO DIMINISH BY 18Z SATURDAY. OTHERWISE, WINDS TO PERSIST FROM THE SOUTHEAST TO SOUTH. BYRD && .LSX WATCHES/WARNINGS/ADVISORIES: MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 410 AM CDT SAT AUG 22 2015 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-231200- GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL- MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL- CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO- LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO- AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO- LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO- ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO- WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO- MADISON MO-REYNOLDS MO- 410 AM CDT SAT AUG 22 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS ACROSS THE ENTIRE AREA. THE BEST CHANCES WILL BE EARLY THIS MORNING FOR CENTRAL MISSOURI AND LATE THIS EVENING AND OVERNIGHT FOR AREAS NORTH AND WEST OF SAINT LOUIS. WHILE WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED... ISOLATED SEVERE STORMS WILL BE POSSIBLE LATE THIS EVENING FOR PARTS OF NORTHEAST AND CENTRAL MISSOURI. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE CHANCE FOR THUNDERSTORMS WILL CONTINUE INTO SUNDAY...ENDING FROM WEST TO EAST WITH PASSAGE OF A COLD FRONT. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS FOR AREAS NORTH AND WEST OF SAINT LOUIS ON FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. TES
The St Louis radar (KLSX), 72 km away, was scanning. The volume nearest the first event began at 17:19 UTC.
2 flash flood. Local standard time, as filed.
Up to three inches of rain fell in a short amount of time causing flash flooding. Highway 94 was closed for a time between Rhineland and Highway P due to water over the roadway.
Up to 4 inches of rain fell in a short amount of time causing flash flooding. Several roads were flooded including Highway Y just east of intersection with Brickey Road. There was about a foot of flowing water on Highway Y in this location.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2015Every state in 2015This day in weather historyWarnings in Missouri, August 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: 603968, 603969.