A cold front moved through the region, triggering showers and thunderstorms. A few of the storms produced severe weather.
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 cold front moved through the region, triggering showers and thunderstorms. A few of the storms produced severe weather.
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 Jul 20, 1:52 PM CST, 19 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 252 PM CDT SAT JUL 20 2013 .SHORT TERM...(THROUGH TONIGHT) ISSUED AT 355 AM CDT SAT JUL 20 2013 EARLY THIS MORNING...THE UPPER LEVEL RIDGE THAT HAD DOMINATED OUR REGION FOR SOME TIME HAS RETREATED TO THE SWRN CONUS AND SRN HI PLAINS...RESULTING IN NW FLOW. A CUTOFF UPPER LO EXISTED NEAR THE TX-LA BORDER. AT THE SFC...A CDFNT EXTENDED FROM NEAR CHICAGO SWWD TO QUINCY TO KANSAS CITY. THIS CDFNT IS STEADILY...ALBEIT SLOWLY... MOVING TO THE SE WITH PRES RISES BEHIND IT REALLY TAILING OFF THE PAST FEW HRS. THIS FRONT HAS KICKED OFF ISOLD TSRA IN THE NRN FA WITH BETTER PCPN COVERAGE ON ITS ERN PERIPHERY IN NRN-CNTRL IL. CLEAR SKIES EXISTED TO THE S OF THIS FRONT WITH TEMP READINGS IN THE 70S. NW UPPER LEVEL FLOW WILL PERSIST TODAY AND BETWEEN THAT AND WHAT CONVECTION IS EXPECTED TO DEVELOP ALONG IT...SHOULD KEEP THE FRONT TRICKLING ALONG TO THE SE FOR A TIME. HOWEVER...THE RIDGING ALOFT CAN ALREADY BE SEEN IN SRN MO AND WRN KY...SO THIS FRONT IS NOT EXPECTED TO PENETRATE TOO FAR TO THE S BEFORE STALLING OUT. THE FORWARD PUSH FROM TSRA DEVELOPING ALONG IT SHOULD ULTIMATELY SPELL THE FRONT/S FORWARD DEMISE...AND SHOULD OCCUR SHORTLY AFTER SUNSET...WHERE IT IS EXPECTED TO BE JUST S OF THE I-70 CORRIDOR. ONCE AGAIN A WEAKLY CAPPED ATMOSPHERE AND RICH MOISTURE THRU THE COLUMN AND MODERATE CONVERGENCE ALONG THE FRONT SHOULD RESULT IN AT LEAST SCT TSRA ALONG IT...MAINLY DURING THE AFTN HOURS...WITH POPS PUSHING MID-RANGE FAVORED FOR AREAS NEAR THE FRONT DURING THE AFTN. TEMPS IN THE NEIGHBORHOOD OF MOS LOOK GOOD AND EVEN WITH EXPECTING POOLING OF DWPTS TO SOME DEGREE NEAR FRONT...PEAK HEAT INDEX VALUES SHOULD REMAIN NEAR OR JUST BELOW 100F. TES .LONG TERM...(SUNDAY THROUGH NEXT SATURDAY) ISSUED AT 252 PM CDT SAT JUL 20 2013 (SUNDAY THROUGH TUESDAY) FOCUS THRU THE PERIOD CONTINUES TO BE PRECIP CHANCES. MDLS ARE IN RELATIVELY GOOD AGREEMENT WITH RESPECT TO MASS FIELDS AND IN GENERAL...HAVE A GENERAL CONSENSUS ON HOW THINGS WILL PAN OUT THRU THIS PERIOD. THERE ARE SOME DIFFERENCES IN TIMING AS WELL AS WHAT FEATURES WILL PRODUCE PRECIP AND WHICH MAY NOT. OVERALL...HAVE TRENDED TWD A GFS/LOCAL WRF SOLN WHICH ARE IN BETTER AGREEMENT THAN THE OTHER OPERATIONAL GUIDANCE. NOT MUCH IN THE WAY OF CHANGES TO THE PREV FORECAST WRT POPS OR TEMPS. LOWERED POPS ACROSS NRN PORTIONS OF THE CWA ON MON. THE S/W IS NOW PROGD TO BE E OF THOSE AREAS BY MON MORNING...BUT WILL KEEP LOW POPS FOR UNCERTAINTY IN TIMING. (WEDNESDAY THROUGH SATURDAY) NOT MUCH IN THE WAY OF CHANGES FROM THE PREV FORECAST THRU THIS PERIOD. MDLS ARE IN GENERALLY GOOD AGREEMENT REGARDING MASS FIELDS. EXPECT THIS PERIOD TO OVERALL BE COOLER WITH PRECIP CHANCES CONTINUING THRU WED. THURS REMAINS DRY WITH THE SFC RIDGE SETTLED OVER THE AREA. HOWEVER...MDLS TIMING THE NEXT S/W AND ASSOCIATED PRECIP INTO THE AREA BY FRI AND REMAINING OVER PORTIONS OF THE CWA INTO SAT. KEPT POPS ON THE LOWER SIDE DUE TO UNCERTAINTY IN TIMING AND WILL INCREASE AS CONFIDENCE BUILDS AND TIME APPROACHES. TILLY && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SUNDAY AFTERNOON) ISSUED AT 1221 PM CDT SAT JUL 20 2013 THE MAIN AREA OF SHOWERS AND THUNDERSTORMS HAS REMAINED SOUTH OF THE TAF SITES SO FAR TODAY ASSOCIATED WITH MID LEVEL MOISTURE AND INSTABILITY. THE MAIN QUESTION IS IF THUNDERSTORMS WILL DEVELOP ALONG THE FRONT WHICH AT MIDDAY STILL RESIDES JUST NORTH OF A COLUMBIA TO ST LOUIS LINE...AND WILL DROP SLOWLY SOUTH THIS AFTERNOON. I HAVE KEPT A MENTION OF VCTS IN THE ST LOUIS AREA TAFS THIS AFTERNOON UNTIL FROPA GIVEN THE UNCERTAINTY. OUTSIDE OF ANY SHOWERS AND THUNDERSTORMS...VFR CONDITIONS WILL PREVAIL. ANOTHER THREAT OF SHOWERS AND THUNDERSTORMS WILL SPREAD FROM CENTRAL MO INTO EASTERN MO/WESTERN ILLINOIS FROM MID MORNING ON SUNDAY INTO THE AFTERNOON. SPECIFICS FOR KSTL... THE COLD FRONT WILL MOVE THROUGH THE TERMINAL THIS AFTERNOON AND THUS HAVE A VCTS IN THE TAF TO COVER THE POTENTIAL FOR SCATTERED THUNDERSTORMS WITH THE FROPA. OUTSIDE OF ANY SHOWERS AND THUNDERSTORMS...VFR CONDITIONS WILL PREVAIL. ANOTHER THREAT OF SHOWERS AND THUNDERSTORMS WILL SPREAD FROM CENTRAL MO INTO EASTERN MO/WESTERN ILLINOIS FROM MID MORNING ON SUNDAY INTO THE AFTERNOON AND THUS HAVE INCLUDED A VCTS ON SUNDAY AFTERNOON. GLASS && .PRELIMINARY POINT TEMPS/POPS... SAINT LOUIS 75 88 72 93 / 20 60 60 30 QUINCY 69 87 69 90 / 10 60 60 20 COLUMBIA 72 86 71 92 / 30 70 50 30 JEFFERSON CITY 72 86 71 92 / 30 70 50 30 SALEM 72 86 71 88 / 30 50 60 50 FARMINGTON 71 85 70 91 / 50 60 60 50 && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 422 AM CDT SAT JUL 20 2013 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-211200- 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- 422 AM CDT SAT JUL 20 2013 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 AS A COLD FRONT DROPS SOUTH THROUGH MUCH OF THE REGION TODAY AND THEN IS EXPECTED TO STALL JUST SOUTH OF THE INTERSTATE 70 CORRIDOR TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE CHANCE FOR THUNDERSTORMS WILL CONTINUE EACH DAY THROUGH WEDNESDAY...WITH THE BEST CHANCES ON SUNDAY. THE CHANCE FOR THUNDERSTORMS WILL RETURN ON FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. TES
The St Louis radar (KLSX), 80 km away, was scanning. The volume nearest the first event began at 20:11 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Thunderstorm winds blew down several tree limbs and power lines. Also, a few large trees were snapped off.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2013Every state in 2013This day in weather historyWarnings in Illinois, July 2013
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: 470291, 470292.