Thunderstorms developed in the vicnity of a weak outflow boundary across central Kansas during the afternoon hours of August 1st. Precipitable water values above two inches, and slow moving thunderstorms combined to provide an environment condusive to flash flooding.
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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 TOP wrote it up.
Thunderstorms developed in the vicnity of a weak outflow boundary across central Kansas during the afternoon hours of August 1st. Precipitable water values above two inches, and slow moving thunderstorms combined to provide an environment condusive to flash flooding. Heavy rainfall in Marshall County, the evening of the 1st, and Republic County, the morning of the 2nd, resulted in local flash flooding problems.
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 Topeka, KS wrote its last area forecast discussion before the first event at Aug 1, 2:50 AM CST, 5 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TOPEKA KS 350 AM CDT WED AUG 1 2007 .DISCUSSION... MCV OVER SOUTHEAST NEBRASKA THIS MORNING SHOWS UP IN REGIONAL RADAR LOOP WITH CONVECTION FIRING ALONG THE KANSAS NEBRASKA BORDER. PROFILERS AND WATER VAPOR SATELLITE LOOP SHOW ANOTHER SHORT WAVE MOVING SOUTHEAST ACROSS CENTRAL NEBRASKA THIS MORNING. THIS FEATURE ALONG WITH SOME ISENTROPIC LIFT ON THE 310K SURFACE ACROSS NORTH CENTRAL KANSAS HELPING TO FIRE STORMS OVER SOUTH CENTRAL NEBRASKA. LOOKS LIKE SCATTERED STORMS ARE LIKELY AGAIN TODAY WITH MOIST AIRMASS REMAINING IN PLACE LOCALLY HEAVY RAIN POTENTIAL IS HIGH. HAVE ADJUSTED POPS SOME FOR TODAY WITH HIGHER POPS FURTHER NORTH TOWARD THE NEBRASKA BORDER AND EAST TOWARD THE MISSOURI LINE. FOR TONIGHT WAVE WILL MOVE ACROSS THE NORTHERN PLAINS AND PUSH A FRONTAL BOUNDARY INTO SOUTHERN NEBRASKA AND POSSIBLY INTO NORTHERN KANSAS BY 12Z THURSDAY. MODELS SUGGEST FRONT WILL BEGIN TO WASH OUT ON THURSDAY OVER NORTHERN KANSAS. WEAK RIPPLES IN THE WEST/NORTHWEST UPPER FLOW WILL MOVE ACROSS SOUTHERN NEBRASKA AND NORTHERN KANSAS THURSDAY AND THURSDAY EVENING. WITH THE MOISTURE REMAINING IN PLACE AND REMNANTS OF FRONTAL BOUNDARY AND ABOVE MENTIONED MID LEVEL WAVES HAVE INCREASED POPS ACROSS THE NORTHERN CWA THROUGH THIS PERIOD. ADDED SOME POPS FOR FRIDAY AS ANOTHER WAVE MOVES ACROSS NEBRASKA AND MAY TRIGGER SOME CONVECTION ACROSS THE NORTHERN CWA. TEMPERATURES THROUGH THE PERIOD WILL CONTINUE TO BE A CHALLENGE WITH CLOUDS AND PRECIPITATION KEEPING TEMPERATURES A BIT COOLER THAN GUIDANCE. GENERALLY WENT WITH A MIX OF GFS/NAM BUT MADE SOME ADJUSTMENTS DOWNWARD FOR HIGHS TODAY AND THURSDAY. GENERALLY WENT WARMER THAN GUIDANCE FOR LOWS. NO CHANGES TO THE EXTENDED. 53 && .AVIATION... WEAK STATIONARY FRONTAL BOUNDARY...MCV OVER SOUTHEAST NEBRASKA...AND ANOTHER SUBTLE SHORTWAVE TROUGH CONTINUES TO CONTRIBUTE TO SHOWER AND THUNDERSTORM ACTIVITY OVER NORTH CENTRAL INTO NORTHEAST KANSAS. EXPECT THIS ACTIVITY TO PURIST INTO THE REMAINDER OF THE MORNING HOURS WITH ADDITIONAL CONVECTION TO FOLLOW. CEILINGS OVER THE AREA MAINLY SCATTERED TO BROKEN AT 12000FT WITH AREAS OF LOW LEVEL CU. VISIBILITY CONTINUES TO BE REDUCED AT 4 TO 6 MILES ACROSS THE MAJORITY OF THE AREA. ANTICIPATE GRADUAL IMPROVEMENT IN VIS BY MID MORNING. REFER TO SHORT TERM FORECAST DISCUSSION FOR ADDITIONAL DETAILS. BLAIR && .TOP WATCHES/WARNINGS/ADVISORIES...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TOPEKA KS 500 AM CDT WED AUG 1 2007 KSZ008>012-020>024-026-034>040-054>056-058-059-021000- REPUBLIC-WASHINGTON-MARSHALL-NEMAHA-BROWN-CLOUD-CLAY-RILEY- POTTAWATOMIE-JACKSON-JEFFERSON-OTTAWA-DICKINSON-GEARY-MORRIS- WABAUNSEE-SHAWNEE-DOUGLAS-LYON-OSAGE-FRANKLIN-COFFEY-ANDERSON- 500 AM CDT WED AUG 1 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL...NORTH CENTRAL AND NORTHEAST KANSAS. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL ARE POSSIBLE TODAY AND TONIGHT. SOME LOCALIZED FLOODING IS POSSIBLE AS WELL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS THURSDAY AND FRIDAY ACROSS THE OUTLOOK AREA. LOCALLY HEAVY RAINFALL WILL AGAIN BE POSSIBLE WITH A FEW OF THE STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT RAINFALL AMOUNTS OVER ONE INCH TO THE NATIONAL WEATHER SERVICE IN TOPEKA.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TOPEKA KS
831 AM CDT WED AUG 01 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0824 AM HEAVY RAIN BEATTIE 39.86N 96.42W
08/01/2007 M1.70 INCH MARSHALL KS CO-OP OBSERVER
1.7 INCHES OF RAIN WITHIN 1.5 HOURS
&&
AWThe Topeka radar (KTWX), 101 km away, was scanning. The volume nearest the first event began at 13:58 UTC.
2 flash flood. Local standard time, as filed.
Water approximately 4 inches deep reported to be flowing across 12th Street in the town of Marysville.
Water one foot deep reported to be flowing over Lincoln Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2007Every state in 2007This day in weather historyWarnings in Kansas, August 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: 53773, 53775.