Thunderstorms dumped very heavy rainfall in a short amount of time over the St. Louis Metro area.
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.
Thunderstorms dumped very heavy rainfall in a short amount of time over the St. Louis Metro area. There were several reports of 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 5, 10:58 PM CST, 2 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 1158 PM CDT WED AUG 5 2015 .SHORT TERM: (THROUGH LATE TONIGHT) ISSUED AT 409 PM CDT WED AUG 5 2015 CANCELLED THE FLASH FLOOD WATCH...FOR TWO REASONS: ONE...THE WATCH AREA DID NOT RECEIVE AS MUCH RAIN TODAY AS EXPECTED. TWO: FCST SCENARIO TONIGHT DOES NOT FOCUS PRECIP IN THE WATCH AREA. MADE SIGNIFICANT ADJUSTMENTS TO OVERNIGHT POPS BASED ON SHORT TERM GUIDANCE. SHORT WAVE AND ASSOC VORT MAX DROPPPING SE OUT OF SE NE/SW IA/NE KS/NW MO IS FCST TO PASS THRU THE CWA OVERNIGHT. SYSTEM EVEN HAS A DECENT 850 LOW THAT PASSES THRU THE MIDDLE OF THE FA AS WELL. MODELS INDICATE PRECIP FILLING IN ACROSS E CNTRL MO LATE THIS AFTN INTO THIS EVNG...ROTATING EAST OVERNIGHT IN WHAT APPEARS TO BE THE RESEMBLANCE OF A DEF ZONE. THIS PUTS THE HIGHEST POPS AND QPF FROM THE STL METRO AREA AND POINTS EAST...AREAS WHICH EITHER DIDNT HAVE A FLASH FLOOD WATCH OR HAD IT PULLED THIS MRNG. NOT WILLING TO SAY HEAVY RAIN IS NOT BE A THREAT TONIGHT BUT THE AREA MOST SUSEPTIBLE HAS NOT HAD MUCH RAIN LATELY. PLUS...PWATS ARE IN EXCESS OF 2 INCHES FROM THE METRO AREA EAST INTO S CNTRL IL...SO IF ANYTHING IS ABLE TO PERSIST OVER A GIVEN LOCATION... RAIN SHOULD PULL EAST LATE TONIGHT WITH LOW CLOUDS FILLING IN BEHIND THE PRECIP. THIS WILL HELP KEEP MINS PRETTY UNIFORM. MOS GUIDANCE SEEMED TO BE HANDLING TRENDS FAIRLY WELL. 2% .LONG TERM: (THURSDAY THROUGH NEXT WEDNESDAY) ISSUED AT 409 PM CDT WED AUG 5 2015 SHOULD HAVE LINGERING SHOWERS AND A FEW STORMS ACROSS SOUTHEAST MO AND SOUTHWEST IL...MAINLY SOUTH AND EAST OF STL THURSDAY MORNING UNTIL THE UPPER LEVEL TROUGH AND ASSOCIATED SURFACE LOW SHIFT SOUTHEAST OF OUR FORECAST AREA. IT APPEARS DRY FOR THURSDAY AFTERNOON AND AT LEAST THURSDAY EVENING AS THE SURFACE RIDGE OVER THE GREAT LAKES REGION NOSES INTO OUR AREA WITH SLIGHTLY COOLER TEMPERATURES MAINLY ACROSS NORTHEAST MO AND WEST CENTRAL IL THURSDAY NIGHT. COULD NOT RULE OUT SOME LATE NIGHT CONVECTION ACROSS CENTRAL AND SOUTHEAST MO DUE TO WEAK WARM AIR ADVECTION. MAY ALSO BE ISOLATED TO WIDELY SCATTERED CONVECTION ON FRIDAY AS A WEAK SURFACE TROUGH APPROACHES...BUT IT APPEARS THAT THE BETTER THREAT WILL REMAIN NORTH OF OUR AREA AHEAD OF AN UPPER LEVEL TROUGH AND ASSOCIATED SURFACE LOW MOVING THROUGH THE NORTHERN PLAINS. AN UPPER LEVEL RIDGE CENTERED OVER THE SOUTHERN PLAINS WILL TRY TO BUILD NORTHEASTWARD INTO OUR AREA FRIDAY NIGHT AND SATURDAY LEADING TO WARMER TEMPERATURES...PARTICULARLY ACROSS CENTRAL AND SOUTHEAST MISSOURI. THERE WILL BE THE POSSIBILITY OF CONVECTION IMPACTING MAINLY NORTHEAST MO AND WEST CENTRAL IL ON THE NORTHERN AND EASTERN PERIPHERY OF THE UPPER LEVEL RIDGE. UPPER LEVEL TROFFING ACROSS THE NORTHERN PLAINS AND GREAT LAKES REGION WILL CAUSE THE UPPER LEVEL RIDGE TO RETROGRADE ALLOWING A COLD FRONT TO DROP SOUTHEASTWARD THROUGH OUR AREA SUNDAY NIGHT AND MONDAY. THIS WILL LEAD TO AN INCREASING CHANCE OF SHOWERS/STORMS ACROSS OUR ENTIRE AREA. COOLER AND DRIER CONDITIONS CAN BE EXPECTED FROM MONDAY NIGHT THROUGH THE REST OF THE FORECAST DUE TO NORTHWEST MID-UPPER LEVEL FLOW AND A SURFACE RIDGE BUILDING SOUTHEASTWARD INTO OUR AREA BEHIND THE COLD FRONT. GKS && .AVIATION: (FOR THE 06Z TAFS THROUGH 06Z THURSDAY NIGHT) ISSUED AT 1155 PM CDT WED AUG 5 2015 IFR AND LOW MVFR CIGS WILL DOMINATE COU AND THE STL METRO TAF SITES THRU THURSDAY MORNING WITH SLOW IMPROVEMENT DURING THE DAY. LIGHT RAIN IS EXPECTED TO PULL OUT BY 09Z FROM STL METRO. UIN SHOULD BE FAR ENOUGH NORTH TO AVOID THE RESTRICTIVE CONDITIONS AND REMAIN VFR. VFR THEN EXPECTED FOR THURSDAY EVENING...BUT SOME RADIATIONAL FOG IS ANTICIPATED FOR JUST BEYOND THE VALID PERIOD THURSDAY OVERNIGHT. OTHERWISE LIGHT NE SFC WINDS WILL CONTINUE. SPECIFICS FOR KSTL: DETERIORATING CONDITIONS TO IFR LATE TONIGHT AND SLOW RECOVERY THURSDAY, PERHAPS BACK TO VFR FOR LATE THURSDAY AFTERNOON OR EARLY EVENING. OTHERWISE, RAIN WILL PERSIST UNTIL AROUND 08Z. NORTHEASTERLY SURFACE WINDS TO CONTINUE THRU THE PERIOD. TES && .LSX WATCHES/WARNINGS/ADVISORIES: MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 403 PM CDT WED AUG 5 2015 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-061130- 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- 403 PM CDT WED AUG 5 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE CHANCE OF THUNDERSTORMS WILL CONTINUE THURSDAY MORNING ACROSS PORTIONS OF SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS. CHANCES OF THUNDERSTORMS WILL EXIST ACROSS PORTIONS OF THE AREA LATE THURSDAY NIGHT AND FRIDAY AND AGAIN SATURDAY THROUGH MONDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. GKS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
835 PM CDT WED AUG 05 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM HEAVY RAIN MARYLAND HEIGHTS 38.72N 90.48W
08/05/2015 M1.97 INCH ST. LOUIS MO BROADCAST MEDIA
1.97 AT KTVI CHANNEL 2 STUDIO SINCE 500 PM. BROADCAST
METEOROLOGIST ALSO REPORTS PONDING ON ROADS.
&&
CARNEYThe St Louis radar (KLSX), 41 km away, was scanning. The volume nearest the first event began at 04:59 UTC.
2 flash flood. Local standard time, as filed.
Up to 4 inches of rain fell in a short amount of time causing flash flooding. Several roads were flooded including Berwyn Drive. Several unoccupied cars were floated down the street in the flood waters.
Up to 4 inches of rain fell in a short amount of time causing flash flooding. Several roads were flooded including Meadow Farm Lane just north of Highway P near O'Fallon, MO. The road was washed out due to the flood waters. In St. Charles, on the north end of Highway 94, just north of intersection with Highway 370, a small apartment complex on Riverview Lane had the first floor apartments flooded by the flash flooding in this area. No injuries were reported.
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: 600639, 600641.