Storms developed across the region, a few of the storms were severe.
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.
Storms developed across the region, a few of the storms were severe.
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 17, 3:09 PM CST, 23 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 409 PM CDT MON AUG 17 2015 .SHORT TERM: (THROUGH LATE TONIGHT) ISSUED AT 409 PM CDT MON AUG 17 2015 ISOLATED TO WIDELY SCATTERED THUNDERSTORMS DEVELOPED A COUPLE OF HOURS AGO. SO FAR STORMS ARE BEHAVING THEMSELVES. FEW REPORTS OF 20-35 MPH WIND GUSTS BUT NO HAIL AS OF YET. EXPECT THERE WILL CONTINUE TO BE A FEW STRONG STORMS, MAYBE A PULSE SEVERE OR TWO, BUT THE SHEAR ISN'T STRONG ENOUGH FOR TRULY ORGANIZED STORMS. MOST OF THE THUNDERSTORM ACTIVITY SHOULD DIMINISH AFTER 00Z TONIGHT, BUT THERE WILL PROBABLY BE LINGERING PRECIS OVER NORTHERN MISSOURI IN CLOSER PROXIMITY TO THE SHORTWAVE NOW MOVING THROUGH IOWA. CARNEY .LONG TERM: (TUESDAY THROUGH NEXT MONDAY) ISSUED AT 409 PM CDT MON AUG 17 2015 DESPITE A SURFACE COLD FRONT EXPECTED TO BE TO OUR NORTH RESULTING IN A WARM-SECTOR TYPE OF SETUP, ACTIVE WX IS EXPECTED ONCE AGAIN ON TUESDAY BUT A BIT MORE WIDESPREAD THAN TODAY. THE MAIN REASON FOR THIS IS A BETTER FOCUS AT THE UPPER LEVELS IN THE FORM OF A DISTURBANCE SET TO ROLL THRU THE AREA DURING THE AFTERNOON AND EVENING HOURS. ENOUGH INSTABILITY IN PLAY FOR A SEVERE THREAT TUESDAY AFTERNOON AND EVENING...MAINLY WEST OF STL METRO. HEADING INTO WEDNESDAY...MODELS NOW ADVERTISING A QUICKER FRONTAL PASSAGE DURING THE MORNING WITH RIDGING ALREADY BUILDING IN BY AFTERNOON. MODELS ARE STILL SHOWING A DECENT STRENGTH UPPER LEVEL DISTURBANCE AGAIN MOVING THRU WEDNESDAY AFTERNOON AND EARLY EVENING WHICH SHOULD AT LEAST KEEP THE RAIN THREAT ALIVE...BUT LOSS OF SURFACE CHARACTERISTICS WILL MAKE IT MORE DIFFICULT FOR A SEVERE THREAT WITH THE SLIGHT RISK THIS DAY LOOKING ON MUCH SHAKIER GROUND THAN 24HRS AGO. DRIER AIR TAKES HOLD WITH A FRONT WELL TO THE SOUTH THURSDAY AND MUCH OF FRIDAY TO JUSTIFY A DRY PERIOD. THE FRONTAL COMPLEX THEN MOVES NORTH TO RESULT IN THE THREAT OF STORMS FOR THE WEEKEND BUT WITH YET ANOTHER COLD FRONT SET FOR LATE SUNDAY TO GIVE US A DRY MONDAY. TEMPS WILL REPRESENT A TUG-OF-WAR BETWEEN SEASONABLE AND BELOW AVERAGE TEMPS THE NEXT SEVEN DAYS...WITH ONE MORE DAY OF SEASONABLE ON TUESDAY...THEN A THREE DAY STRETCH OF BELOW AVERAGE WED-FRI... THEN BACK TO SEASONABLE FOR THE WEEKEND...THEN BACK TO BELOW AVERAGE AGAIN NEXT MONDAY. TES && .AVIATION: (FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON) ISSUED AT 1238 PM CDT MON AUG 17 2015 ISOLATED THUNDERSTORMS ARE POPPING UP AT THIS TIME. THESE WILL BE THE PRIMARY WEATHER HAZARD INTO EARLY EVENING. VFR CONDITIONS ARE EXPECTED OUTSIDE OF STORMS. HOWEVER...HEAVY RAIN IN SOME OF THE STORMS WILL LIKELY DROP VSBYS DOWN BELOW 3SM. GUSTY WINDS OF 25 TO 40KTS WILL ALSO BE POSSIBLE WITH THE STRONGEST STORMS. EXPECT THE VAST MAJORITY OF THE STORMS TO DISSIPATE QUICKLY AFTER 00Z, BUT SOME MAY LINGER ACROSS NORTHERN MISSOURI/WESTERN ILLIONIS INTO THE EVENING AND POSSIBLY OVERNIGHT HOURS. LIGHT WINDS OVERNIGHT WILL ALLOW ANY AREAS THAT GET RAIN TO DEVELOP FOG. THINK THE FOG SHOULD BE MOSTLY MVFR, BUT IFR VSBYS ARE POSSIBLE IN ESPECIALLY SHELTERED SPOTS. SPECIFICS FOR KSTL: ISOLATED THUNDERSTORMS ARE POPPING UP AT THIS TIME. THESE WILL BE THE PRIMARY WEATHER HAZARD INTO EARLY EVENING. EXPECT VFR TO PREVAIL AT LAMBERT...UNLESS ONE OF THESE STORMS HAPPENS TO PASS OVER THE TERMINAL. IF A STORM MOVES OVER THE AIPORT, GUSTY WINDS OF 25 TO 40KTS WILL ALSO BE POSSIBLE. EXPECT THE STORMS OVER THE STL METRO ARE TO DISSIPATE QUICKLY AFTER 00Z. VFR CONDITIONS ARE EXPECTED TO PREVAIL AT LAMBERT TONIGHT...THOUGH IF IT DOES RAIN THIS AFTERNOON, SOME MVFR FOG IS POSSIBLE. THERE WILL BE ANOTHER CHANCE OF THUNDERSTORMS TUESDAY AFTERNOON CARNEY && .LSX WATCHES/WARNINGS/ADVISORIES: MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 403 PM CDT MON AUG 17 2015 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-181200- 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 MON AUG 17 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS CAN BE EXPECTED...MAINLY NORTH AND WEST OF SAINT LOUIS. A FEW STORMS MAY BE STRONG THROUGH EARLY THIS EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THUNDERSTORMS WILL BECOME LIKELY TUESDAY THROUGH WEDNESDAY. SOME OF THE STORMS MAY BE SEVERE DURING LATE TUESDAY AND POSSIBLY AGAIN ON WEDNESDAY. THE CHANCE FOR THUNDERSTORMS THEN RETURNS LATE FRIDAY AND CONTINUES THROUGH SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. TES
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 306 PM CDT MON AUG 17 2015 MOZ036-052-172030- PIKE MO-LINCOLN MO- 306 PM CDT MON AUG 17 2015 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI AND SOUTH CENTRAL PIKE COUNTIES IN NORTHEASTERN MISSOURI UNTIL 330 PM CDT... AT 306 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES SOUTHWEST OF EOLIA...MOVING SOUTHEAST AT 5 MPH. HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... EOLIA...SILEX...WHITESIDE...CYRENE AND EDGEWOOD. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 3921 9089 3900 9110 3915 9128 3931 9113 TIME...MOT...LOC 2006Z 307DEG 5KT 3919 9114 CARNEY
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
334 PM CDT MON AUG 17 2015
MOZ036-051-052-060-172115-
MONTGOMERY MO-PIKE MO-LINCOLN MO-WARREN MO-
334 PM CDT MON AUG 17 2015
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN MONTGOMERY AND
WESTERN LINCOLN COUNTIES IN EAST CENTRAL MISSOURI...SOUTHWESTERN PIKE
COUNTY IN NORTHEASTERN MISSOURI AND NORTHERN WARREN COUNTIES IN EAST
CENTRAL MISSOURI UNTIL 415 PM CDT...
AT 334 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
BELLFLOWER...MOVING EAST AT 20 MPH.
HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.
LOCATIONS IMPACTED INCLUDE...
TROY...MOSCOW MILLS...DAVIS...HAWK POINT...BELLFLOWER...SILEX...
MIDDLETOWN...TRUXTON...WHITESIDE...CAVE AND OLNEY.
THIS WARNING ALSO INCLUDES CUIVRE RIVER STATE PARK.
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
LAT...LON 3914 9141 3916 9141 3919 9092 3892 9093
3897 9142 3914 9142
TIME...MOT...LOC 2034Z 271DEG 17KT 3907 9133
CARNEYSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 358 PM CDT MON AUG 17 2015 MOZ049-050-059-172145- OSAGE MO-CALLAWAY MO-GASCONADE MO- 358 PM CDT MON AUG 17 2015 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSAGE...SOUTHEASTERN CALLAWAY AND NORTHWESTERN GASCONADE COUNTIES UNTIL 445 PM CDT... AT 358 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES NORTH OF LINN...MOVING EAST AT 25 MPH. DIME SIZE HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... CHAMOIS...MOKANE...MORRISON...FRANKENSTEIN AND PORTLAND. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. && LAT...LON 3876 9168 3852 9151 3850 9195 3864 9196 TIME...MOT...LOC 2058Z 247DEG 22KT 3858 9186 TES
The St Louis radar (KLSX), 81 km away, was scanning. The volume nearest the first event began at 21:32 UTC.
1 thunderstorm wind. Local standard time, as filed.
Several large trees were blown down. One was blocking the road.
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: 603954.