Scattered severe thunderstorms formed during the early evening.
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.
Scattered severe thunderstorms formed during the early evening.
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 May 26, 4:51 PM CST, 39 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 551 PM CDT SAT MAY 26 2007 .DISCUSSION... THE CHARACTER OF THE AIR MASS TODAY IS A BIT DIFFERENT THAT THE LAST FEW DAYS WITH SLIGHTLY STEEPER LOW LEVEL LAPSE RATES. THIS PROFILE COMBINED WITH DIURNAL HEATING HAS RESULTED IN DECENT INSTABILITY WITH SBCAPES AROUND 2000 J/KG...AND NO CAP WITHIN THE WARM SECTOR ACROSS THE CWA. THE RESULT HAS BEEN SCATTERED THUNDERSTORMS. SHEAR IS RATHER WEAK THUS THE CONVECTIVE MODE HAS BEEN PULSE TYPE STORMS WITH DEADLY LIGHTNING...HEAVY DOWNPOURS...GUSTY SFC WINDS...AND WITH THE STRONGEST...SOME ISOLD LARGE HAIL. WE WILL CONTINUE TO SEE SCATTERED TSRA TRAVERSE SW TO NE ACROSS THE CWA INTO THE EARLY EVENING...THEN ANTICIPATE A DRAMITIC DECREASE WITH SUNSET AND THE LOSS OF HEATING AND INSTABILITY. OVERNIGHT WE SHOULD CONT TO SEE A DECENT CHANCE OF SHRA AND TSRA ACROSS NE MO INTO WEST CENTRAL IL WHERE THERE IS THE JUXTAPOSITION OF THE SWLY LLJ AND DIVERGENCE ALOFT ASSOCD WITH AN ULJ ENTRANCE REGION...ALONG AND IN ADVANCE OF THE NEXT ENCROACHING CDFNT. ON SUNDAY THE REGION REMAINS WITHIN A DEEP WARM AND MOIST SWLY FLOW AND THE WARM SECTOR CHARACTER SHOULD BE SIMILAR TO TODAY. THE NEW FACTOR WILL BE THE COLD FRONT WHICH SHOULD SLOWLY PUSH SOUTH TO THE VICINITY OF I-70 DURING THE AFTERNOON. THERE IS A RATHER DEEP AND BROAD REGION OF ASCENT FORECAST TO SPAN THE FRONTAL ZONE AND THE IMMEDIATE WARM SECTOR TO ITS SOUTH. THIS FORCING COMBINED WITH THE AIR MASS CHARACTERIZED BY K INDICES IN THE MID 30S AND MUCAPES AOA 1500 J/KG SHOULD YIELD MUCH GREATER STORM COVERAGE THAN THE LAST FEW DAYS. WHILE IM NOT ANTICIPATING ANY MCS DEVELOPMENT GIVEN THE LOW VALUES OF DP LAYER SHEAR...HIGH RAFL RATES WITH INDIVIDUAL STORMS...SLOW STORM MOTION AND TRAINING POTENTIAL COULD RESULT IN SOME LOCALLY HEAVY RAFL AMOUNTS IN THE REGION ALONG AND NORTH OF I-70. ANTICIPATING THE COVERAGE OF STORMS TO DIMINISH ON SUNDAY EVENING MUCH LIKE TONIGHT BUT THE REGION INVOF OF THE FRONT WILL CONTINUE TO BE SUPPORTIVE OF CONVECTION THROUGH THE NIGHT. THE FRONT THEN RETREATS NORTHWARD ON MONDAY AND CURRENT INDICATIONS ARE THE WARM SECTOR AIR MASS ON MONDAY AND TUESDAY WONT BE QUITE AS ACTIVE AS TODAY...HOWEVER STILL CAPABLE OF ISOLD TO WDLY SCT MAINLY AFTERNOON TSRA. LOOKING TOWARDS THE EXTENDED RANGES...THERE IS GROWING MODEL CONSENSUS THAT A DECENT COLD FRONT WILL MOVE THROUGH THE MS VLY ON WED NIGHT ASSOCD WITH A TROF DIGGING SEWD FROM THE UPR MS VLY. THIS TROF IS FCST TO DIG AND AMPLIFY WITH A LARGE SCALE MEAN UPPER TROF DEVELOPING IN THE ERN U.S. DURING THE LATER HALF OF THE WEEK... AND COOLER AND DRY WEATHER NEXT WEEKEND. GLASS && .AVIATION... FOR THE 00Z TAFS... HAVE TRIED TO PIN DOWN TIMING FOR TSRA WITH FRONTAL BOUNDARY LATER TONIGHT AND INTO SUNDAY. IN THE SHORT TERM...SCATTERED RWS/TRWS WILL SLOWLY DIMINISH TOWARDS SUNSET...SO ONLY HAVE BRIEF MENTION AT KUIN...KSUS AND KSTL TIL 01Z. IN THE MEANTIME...CDFNT EXTENDS FROM SERN MN THRU IA AND INTO NWRN MO AND IS EXPECTED TO MOVE SE AND REACH UIN BY 10Z AND COU AREA AROUND 14Z SUNDAY. THIS FNT IS STILL EXPECTED TO BECOME STATIONARY ACROSS STL...SUS AND COU LATE TMW AFTN. SO ADDED PROB30 MENTION TO KUIN FROM 06Z TO 13Z DUE TO FRONT...FROM 14Z TO 24Z FOR KCOU AND FROM 18Z TO 24 FOR KSUS AND KSTL. BYRD && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 409 PM CDT SAT MAY 26 2007 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-271200- 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-LEWIS- SHELBY-MARION-MONROE-RALLS-PIKE-BOONE-AUDRAIN-MONITEAU-COLE-OSAGE- CALLAWAY-MONTGOMERY-LINCOLN-GASCONADE-WARREN-ST. CHARLES-FRANKLIN- ST. LOUIS-ST. LOUIS CITY-JEFFERSON-CRAWFORD-WASHINGTON- ST. FRANCOIS-STE. GENEVIEVE-IRON-MADISON-REYNOLDS- 409 PM CDT SAT MAY 26 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS THE REGION THROUGH THE EVENING HOURS. ALTHOUGH NO WIDESPREAD SEVERE WEATHER IS EXPECTED...A FEW OF THE STRONGER STORMS MAY PRODUCE HEAVY RAIN...GUSTY WINDS...AND SMALL HAIL. THE COVERAGE OF STORMS SHOULD DIMINISH ACROSS MUCH OF THE AREA BY LATE EVENING...WITH THE GREATEST THREAT OF STORMS DURING THE OVERNIGHT HOURS ACROSS NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THUNDERSTORMS ARE LIKELY ACROSS A GOOD PORTION OF THE AREA ON SUNDAY. ONCE AGAIN THE MAIN THREAT FROM THESE STORMS WILL BE LOCALLY HEAVY RAIN...GUSTY WINDS...AND POSSIBLY SMALL HAIL. SOME LOCATIONS ALONG AND NORTH OF INTERSTATE 70 COULD SEE SEVERAL ROUNDS OF THUNDERSTORMS TRAVERSE THE SAME SPOT...RESULTING IN LOCALLY HEAVY RAINFALL TOTALS. THE CHANCE FOR THUNDERSTORMS WILL CONTINUE SUNDAY NIGHT THROUGH WEDNESDAY NIGHT. THIS PERSISTENT THREAT OF THUNDERSTORMS WILL BE PRODUCED BY A SERIES OF FRONTAL BOUNDARIES THAT ARE FORECAST TO PUSH INTO THE AREA AND INTERACT WITH WARM UNSTABLE AIR THAT WILL BE BLANKETING THE NATIONS MIDSECTION. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ASKED TO RELAY ANY REPORTS OF STRONG WINDS...HEAVY RAIN...AND HAIL. GLASS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
323 PM CDT SAT MAY 26 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0310 PM HAIL GRIGGSVILLE 39.71N 90.73W
05/26/2007 M1.00 INCH PIKE IL TRAINED SPOTTER
0310 PM HAIL GRIGGSVILLE 39.71N 90.73W
05/26/2007 M0.88 INCH PIKE IL TRAINED SPOTTER
&&
SIPPRELLThe St Louis radar (KLSX), 71 km away, was scanning. The volume nearest the first event began at 23:31 UTC.
2 hail, 1 thunderstorm wind. Local standard time, as filed.
Several power poles were reported down north northeast of town.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2007Every state in 2007This day in weather historyWarnings in Illinois, May 2007
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: 35472, 35474, 35476.