Dense fog developed across Coffey and Anderson Counties in east central Kansas during the early morning hours of September 9th. Moisture pooled and winds sharply dropped off ahead of a weak cold frontal boundary, which helped the dense fog to develop.
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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.
Dense fog developed across Coffey and Anderson Counties in east central Kansas during the early morning hours of September 9th. Moisture pooled and winds sharply dropped off ahead of a weak cold frontal boundary, which helped the dense fog to develop. Once the cold front passed through the region, winds picked up out of the north and mixing helped lift the fog. Local law enforcement and storm spotters reported adverse driving conditions when visibilities were at their lowest. Fortunately, no accidents were reported.
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 Sep 8, 2:23 PM CST, 10 hours 32 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TOPEKA KS 323 PM CDT SAT SEP 8 2007 .DISCUSSION... TONIGHT-TOMORROW NIGHT...FRONTAL BOUNDARY ALONG KS/OK BORDER WILL DIP SLIGHTLY SOUTHWARD OVERNIGHT...AND SHORTWAVES TRACKING ACROSS OK LOOK TO REMAIN SOUTH OF THE CWA. PERSISTENT E/NERLY WINDS THROUGH THE PERIOD HELP TO ADVECT DRY AIR INTO THE REGION. AS A RESULT...KEPT EAST CENTRAL KANSAS DRY THROUGH TOMORROW NIGHT. BUT...WEAK BOUNDARY EXTENDING FROM SFC LOW OVER CENTRAL SD PROVIDES ENOUGH LIFT OVER NE/W KS FOR SHOWERS TONIGHT. MAIN CONCERN WILL BE IF SHOWERS ARE ABLE TO SUSTAIN THEMSELVES ENOUGH TO MAKE IT INTO THE NW PART OF THE CWA. DO NOT EXPECT THEM TO DO SO DUE TO LACK OF DEEP MOISTURE. ATTM...08/12Z NAM A BIT MORE ROBUST WITH LOW LEVEL MOISTURE OVER CENTRAL/NORTHERN KS THAN 08/12Z GFS...AND BOTH DEPICT A STRATUS DECK OVERSPREADING SAID PORTIONS OF KS SUNDAY MORNING. USED SOMEWHAT OF A BLEND OF THE NAM AND GFS...BUT FAVORED NAM SOLUTION. WEAK ISENTROPIC LIFT ON 300K SURFACE MAY BRING SOME SHOWERS TO THE NORTHERN TIER OF COUNTIES BEGINNING LATE SUNDAY AFTERNOON AHEAD OF THE MAIN FRONT AND ROCKIES SHORTWAVE COMING THROUGH OVERNIGHT SUN/MON. STRATUS MAY HINDER EARLY WARM-UP OVER NC KANSAS...AND KEPT TEMPERATURES A BIT COOLER THAN GUIDANCE WHERE THE MOST CLOUD COVER IS EXPECTED. EK SUNDAY NIGHT THROUGH TUESDAY...BEHIND THE LEADING FRONTAL BOUNDARY COLDER AIR SURGES SOUTH THROUGH THE HIGH PLAINS AHEAD OF A STRONG SHORTWAVE PUSHING OUT OF NORTHWEST CANADA AND INTO THE CENTRAL PLAINS FOR SUNDAY NIGHT AND MONDAY. FEEL THAT WITH THE STATIONARY FRONTAL BOUNDARY OFF TO THE SOUTH...DEEP MOISTURE WILL REMAIN SOUTH OF THE CWA AND PRECIPITATION WILL DEVELOP WELL BEHIND THE FRONT. GFS/NAM CONTINUE TO INDICATE BAROCLINIC CYCLOGENESIS ALONG THE STATIONARY FRONTAL BOUNDARY TO THE SOUTH. FEEL MOST CONFIDENT ABOUT PRECIPITATION ONCE AN INVERTED TROUGH/LOW DEVELOPS NEAR NORTHEASTERN OK BRINGING GULF MOISTURE INTO EASTERN KS ALONG THE BOUNDARY OF DEEPER CANADIAN AIR MOVING SOUTHEAST THROUGH THE FORECAST AREA. WITH THE STRONG SHORTWAVE OFF TO THE WEST HEIGHT FALLS WILL BE RELATIVELY WEAK OVER EASTERN KS WHILE GOOD ISENTROPIC LIFT DEVELOPS SHOWERS OVER THE CWA. WITH RELATIVELY WARM AIR ALOFT COMPARED TO BETTER LOW LEVEL COLD AIR ADVECTION...THINK CONVECTIVE CHANCES ARE SMALL...SO HAVE KEPT CONVECTION LIMITED TO SLIGHT CHANCE/ISOLATED WORDING. FEEL BEST CHANCE OF PRECIPITATION IS MONDAY WHEN THE GFS/EUROPEAN HAVE CONSISTENTLY BROUGHT THE CANADIAN AIRMASS SOUTH. FOR NOW...COMPLETELY DISCOUNTING 12Z NAM SOLUTION AFTER 00Z MONDAY AS IT IS THE ONLY SOLUTION THAT DEVELOPS A DEEP CUT OFF UPPER LEVEL LOW WITH THE SHORTWAVE AND DELAYS THE BEST PRECIPITATION CHANCES UNTIL TUESDAY NIGHT. WEDNESDAY THROUGH SATURDAY...BEHIND THE STRONG SHORTWAVE SUBSIDENCE WILL END PRECIPITATION FROM NORTHWEST TO SOUTHEAST ACROSS THE CWA BY TUESDAY AFTERNOON. SUBSIDENCE SEEMS TO HOLD OVER THE CENTRAL PLAINS ON WEDNESDAY WHILE LEE SIDE TROUGHING DEVELOPS OVER THE HIGH PLAINS AND BRINGS SOUTHERLY FLOW BACK THROUGH THE PLAINS. WEDNESDAY LOOKS TO BE A DAY FOR MOISTURE RECOVERY THROUGH THE PLAINS WITH PERSISTENT SOUTHERLY FLOW. WEDNESDAY NIGHT THE GFS/EUROPEAN CONTINUES TO BRING A SHORTWAVE CLIPPER SYSTEM THROUGH THE NORTHERN PLAINS AND INTO THE GREAT LAKES WEDNESDAY NIGHT. THIS WILL SEND A FRONTAL BOUNDARY SOUTH THROUGH THE NORTHERN PLAINS...HOWEVER IT LOOKS AS THOUGH THIS FRONT WILL STALL OUT NORTH OF THE CWA WITH CLIPPER ENERGY MOVING OFF TO THE EAST. WITH THE BOUNDARY REMAINING NORTH MOISTURE WILL CONTINUE TO PUSH SLOWLY INTO THE FORECAST AREA DURING THE DAY THURSDAY. AFTER THURSDAY THE GFS/EUROPEAN BEGIN TO DIFFER ON LARGE SCALE FEATURES WHICH GREATLY COMPLICATES THE FORECAST. BOTH MODELS BRING A STRONG UPPER LEVEL TROUGH SOUTH OUT OF NORTHWEST CANADA...BUT BASED ON THE STRENGTH OF UPPER LEVEL RIDGING OVER THE WESTERN CONUS THIS TROUGH...AND ATTENDANT COLD...CANADIAN AIRMASS...WILL EITHER SLIDE SOUTH THROUGH THE CENTRAL PLAINS...OR PULL THROUGH THE NORTHERN PLAINS AND THEN INTO THE OHIO VALLEY. NEEDLESS TO SAY THE DIFFERENCE IN PLACEMENT OF THIS TROUGH WILL HAVE A LARGE IMPACT ON THE WEATHER TOWARDS THE END OF THE WEEK AND INTO THE WEEKEND. THE MOST CONSISTENT FEATURE IS THE APPROACH AT LEAST OF A FRONTAL BOUNDARY ASSOCIATED WITH THE CANADIAN AIRMASS TOWARDS THE CWA ON FRIDAY. IF THE 12Z EUROPEAN VERIFIES THE CANADIAN AIRMASS PUSHES INTO THE OHIO VALLEY...AND THE COLD FRONT WILL LIKELY STALL OUT SOMEWHERE OVER EASTERN KS ON FRIDAY. IF THE 12Z GFS VERIFIES CANADIAN AIR INVADES THE CENTRAL PLAINS PUSHING THE COLD FRONT WELL SOUTH INTO THE SOUTHERN PLAINS AND DROPPING TEMPERATURES 10-15 DEGREES BELOW HPC GUIDANCE. REGARDLESS OF THE SOLUTION BOTH THE GFS AND THE EUROPEAN BRING A FRONT AT LEAST INTO NORTHEASTERN KS ON FRIDAY...SO HAVE GONE WITH MENTION OF RAIN SHOWERS THURSDAY NIGHT INTO FRIDAY AND FRIDAY NIGHT IN THE EXTENDED FORECAST. AT THIS TIME WITH REGARDS TO TEMPERATURES REMAINED NEAR HPC GUIDANCE WITH MAX TEMPERATURES IN THE UPPER 60S TO LOWER 70S AS THERE IS GREAT VARIATION IN OPERATIONAL GFS AND EUROPEAN MODEL RUNS. DC && .AVIATION... TROPICAL SYSTEM MOVING OFF TO THE EAST THIS AFTERNOON WILL BRING ONLY SOME HIGH CIRRUS TO THE TAF SITES INTO EARLY EVENING. FOR TONIGHT THROUGH SUNDAY MORNING EXPECTING RELATIVELY WEAK EAST WINDS TO SHIFT TO THE NORTHEAST FOR THE BALANCE OF THE EVENING. COLD FRONT TO THE NORTHWEST ACROSS NORTHWEST NEBRASKA WILL MOVE SOUTH OVERNIGHT AND INTO THE KMHK AREA TOWARD 11Z...THEN INTO THE KTOP AND KFOE SITES BY 13Z. FORECAST SOUNDINGS AND LOW LEVEL RH PROGS SUGGEST SOME MVFR CIGS NEAR 1200 FT IN THE KMHK VICINITY AFTER FROPA. FURTHER EAST MOISTURE WILL BE LIMITED AND THUS EXPECT A CONTINUATION OF VFR THROUGH 18Z. JW && .TOP WATCHES/WARNINGS/ADVISORIES...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TOPEKA KS 406 PM CDT SAT SEP 8 2007 KSZ008>012-020>024-026-034>040-054>056-058-059-092115- REPUBLIC-WASHINGTON-MARSHALL-NEMAHA-BROWN-CLOUD-CLAY-RILEY- POTTAWATOMIE-JACKSON-JEFFERSON-OTTAWA-DICKINSON-GEARY-MORRIS- WABAUNSEE-SHAWNEE-DOUGLAS-LYON-OSAGE-FRANKLIN-COFFEY-ANDERSON- 406 PM CDT SAT SEP 8 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL...NORTH CENTRAL AND NORTHEAST KANSAS. .DAY ONE...TONIGHT THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS NORTH CENTRAL KANSAS SUNDAY NIGHT. THUNDERSTORM CHANCES WILL SPREAD SOUTHEAST TO INCLUDE THE ENTIRE OUTLOOK AREA MONDAY AND MONDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTERS SHOULD NOT BE NEEDED TONIGHT.
The national radar mosaic for the moment the first event began.
2 dense fog. Local standard time, as filed.
Dense fog was reported across the county by local law enforcement. Visibilites were generally in the 1/4 to 1/2 mile range through the duration of the event, but periodically dropped down below 1/4 mile.
Dense fog was reported across the county by local law enforcement. Visibilites were generally in the 1/4 to 1/2 mile range through the duration of the event, but periodically dropped down below 1/4 mile.
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, September 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: 59834, 59835.