Slow moving thunderstorms moved southeast across Thomas county during the evening hours, dropping very heavy rainfall which resulted in water running 18 inches deep across streets in Colby.
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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 GLD wrote it up.
Slow moving thunderstorms moved southeast across Thomas county during the evening hours, dropping very heavy rainfall which resulted in water running 18 inches deep across streets in Colby.
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 Goodland, KS wrote its last area forecast discussion before the first event at Jul 9, 5:35 PM CST, 1 hour 35 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GOODLAND KS 535 PM MDT FRI JUL 9 2010 .DISCUSSION... 200 PM MDT FRI JUL 9 2010 ISOLATED THUNDERSTORMS POPPING UP WITH AXIS OF 850-500 MOISTURE/AROUND 1K J/KG CAPE AND LITTLE CIN AND A SUBTLE WIND SHIFT. STORM MOVEMENT SLOWLY E/SE. ANOTHER BATCH OF THUNDERSTORMS CURRENTLY ALONG THE FRONT RANGE WITHIN 700-300 MOISTURE ALSO MOVING E/SE. ACTIVITY EAST OF THE CO/KS BORDER EXPECTED TO LINGER THROUGH 03Z OR SO BEFORE DISSIPATING WITH LOSS OF HEATING. ACTIVITY TO THE WEST ALSO EXPECTED TO DISSIPATE AS IT REACHES THE CO/KS BORDER. MORE ORGANIZED CONVECTION WILL MOVE INTO THE AREA SATURDAY AFTERNOON FROM THE NORTHWEST...EXITING THE AREA AROUND MIDNIGHT OR SHORTLY AFTER. THERE ARE SOME TIMING DIFFERENCES WITH THE SPEED OF THIS SYSTEM SO HAVE COMPROMISED GENERALLY FAVORING AREAS IN THE VICINITY OF THE CO/KS BORDER BY 00Z...AREAS EAST OF THE BORDER AFTER 00Z. SEVERE WEATHER POSSIBLE ALONG WITH LOCALLY HEAVY RAINFALL. AFTERNOON TEMPERATURES IN THE LOW TO MID 90S. FOR SUNDAY NOT TERRIBLY EXCITED ABOUT AFTERNOON CHANCES FOR STORMS AS WELL BE IN BETWEEN SATURDAY NIGHTS SYSTEM AND ANOTHER WHICH APPROACHES THE AREA FROM THE NORTHWEST. FOR NOW WILL KEEP SLIGHT CHANCE POPS BUT EMPHASIZE BETTER CHANCE SUNDAY NIGHT WITH LOW CHANCE POPS AS THE SYSTEM MOVES THROUGH. HIGH TEMPERATURES AGAIN LOW TO MID 90S. DIFFICULT TEMPERATURE FORECAST MONDAY AS THE DEGREE OF COOLING BEHIND SUNDAY NIGHTS SYSTEM IN QUESTION WITH GFS COOLER THAN THE NAM. LOWERED TEMPS A FEW DEGREES WITH MID TO UPPER 80S BUT EXPECT THIS TO CHANGE AS WE GET CLOSER TO THE DAY. ALSO NOT EXCITED ABOUT AFTERNOON PRECIP CHANCES AS I THINK WELL BE IN BETWEEN FRONT RANGE CONVECTION AND DEPARTING SYSTEM TO THE SOUTHEAST. ANY STORMS THAT DO MANAGE TO DEVELOP WILL END BY MIDNIGHT. TUESDAY-FRIDAY...TUESDAY LOOKS DRY WITH ANOTHER CHANCE OF STORMS WEDNESDAY AFTERNOON AND NIGHT AS AN UPPER TROUGH AND COLD FRONT MOVE INTO THE AREA. HIGH TEMPERATURES BOTH DAYS IN THE 90S. THURSDAY SHOWING PLENTIFUL POST FRONTAL MOISTURE IN THE AREA WITH DISTURBANCES MOVING THROUGH FROM THE WEST LEADING TO AT LEAST A SLIGHT CHANCE OF THUNDERSTORMS. DRY WEATHER CURRENTLY EXPECTED FRIDAY WITH CONVECTION POSSIBLE WEST OF THE AREA. MAX TEMPS AROUND 90 THURSDAY...LOW 90S FRIDAY. 99 && .AVIATION... 535 PM MDT FRI JUL 9 2010 FOR THE 00Z TAFS...VFR CONDITIONS ARE EXPECTED TO PERSIST OVER BOTH MCK AND GLD THROUGH THE EFFECTIVE TAF PERIOD. SHOWERS AND THUNDERSTORMS THAT HAVE DEVELOPED ALONG THE NEBRASKA/KANSAS STATE LINE ARE CURRENTLY MOVING SOUTHEAST...AND AT THIS POINT LOOK TO REMAIN OUTSIDE OF THE VICINITY OF EITHER MCK OR GLD TERMINALS. OUTFLOW FROM THIS THUNDERSTORM COMPLEX MOVING SOUTH IS EXPECTED TO PASS OVER THE GLD TERMINAL CAUSING WINDS TO SHIFT TO THE NORTHEAST BETWEEN 00Z-02Z. ADDITIONAL SHOWERS AND THUNDERSTORMS MAY STILL DEVELOP ACROSS THE AREA...WITH WEAK INSTABILITY A MOIST AIRMASS STILL IN PLACE. THESE SHOWERS AND THUNDERSTORMS EFFECT OVER EITHER TERMINAL IS STILL IN QUESTION...SO WILL KEEP CB IN TAFS FOR NOW. DR && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. NE...NONE. CO...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GOODLAND KS 315 PM MDT FRI JUL 9 2010 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-101200- YUMA-KIT CARSON-CHEYENNE CO-CHEYENNE KS-RAWLINS-DECATUR-NORTON- SHERMAN-THOMAS-SHERIDAN-GRAHAM-WALLACE-LOGAN-GOVE-GREELEY-WICHITA- DUNDY-HITCHCOCK-RED WILLOW- 315 PM MDT FRI JUL 9 2010 /415 PM CDT FRI JUL 9 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR EXTREME SOUTHWEST NEBRASKA...NORTHWEST KANSAS AND EAST CENTRAL COLORADO. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS MOVING OFF THE FRONT RANGE WILL BRING A RISK OF LOCALLY STRONG WIND GUSTS AND HAIL TO EASTERN COLORADO THROUGH THE EVENING HOURS. ELSEWHERE...THUNDERSTORMS ACROSS WESTERN KANSAS AND SOUTHWEST NEBRASKA WILL MOVE VERY SLOWLY PROMOTING LOCALLY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS ACROSS THE TRI-STATE AREA SATURDAY AFTERNOON AND NIGHT AS A WEATHER DISTURBANCE MOVES THROUGH THE AREA FROM THE NORTHWEST. SEVERE THUNDERSTORMS ARE EXPECTED WITH LARGE HAIL...DAMAGING WINDS AND LOCALLY HEAVY RAINFALL BEING THE PRIMARY THREATS. ISOLATED TORNADOES ARE ALSO POSSIBLE. ANOTHER WEATHER DISTURBANCE WILL MOVE THROUGH THE AREA LATE SUNDAY AFTERNOON THROUGH THE NIGHT PRODUCING ANOTHER CHANCE FOR THUNDERSTORMS. SEVERE WEATHER IS POSSIBLE. THE CHANCE FOR SHOWERS AND THUNDERSTORMS CONTINUES JUST ABOUT EVERY AFTERNOON AND EVENING FROM MONDAY THROUGH THURSDAY. WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THIS AFTERNOON AND TONIGHT. 07
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
710 PM MDT FRI JUL 09 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0710 PM FLASH FLOOD COLBY 39.39N 101.05W
07/09/2010 THOMAS KS AMATEUR RADIO
WATER FLOWING 18 INCHES DEEP IN TOWN.
&&
HENDERSONThe Goodland radar (KGLD), 57 km away, was scanning. The volume nearest the first event began at 01:09 UTC.
1 flash flood. Local standard time, as filed.
Water was reported flowing 18 inches deep in town. A CoCoRaHS observer also reported a rainfall rate of 8.23 inches per hour at 7:53 pm CDT.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2010Every state in 2010This day in weather historyWarnings in Kansas, July 2010
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: 231433.