Several thunderstorms formed in Washington County Colorado during the late afternoon and intensified as they moved east-southeast. 5 inches in diameter and strong winds over 60 mph were reported.
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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.
Several thunderstorms formed in Washington County Colorado during the late afternoon and intensified as they moved east-southeast. Hail to 2.5 inches in diameter and strong winds over 60 mph 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 Goodland, KS wrote its last area forecast discussion before the first event at Jul 12, 12:35 PM MST, 3 hours 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GOODLAND KS 135 PM MDT SUN JUL 12 2009 .DISCUSSION... 135 PM MDT SUN JUL 12 2009 ACTIVE WEATHER LOOKS TO CONTINUE TONIGHT AS ANOTHER ROUND OF THUNDERSTORMS ARE EXPECTED TO DEVELOP IN COLORADO AND MOVE EAST ACROSS THE FORECAST AREA TONIGHT. SATELLITE IMAGERY SHOWS THUNDERSTORMS DEVELOPING OFF THE FRONT RANGE. ONE MAIN CONCERN LOOKS TO BE THE POTENTIAL FOR ANOTHER ROUND OF HEAVY RAIN. OVER THE PAST FEW EVENINGS...AROUND 1.75-2.00 OF RAINFALL HAS BEEN REPORTED EACH NIGHT OVER CHEYENNE COUNTY CO WITH LESSER AMOUNTS ELSEWHERE. WILL HAVE TO WATCH AGAIN TONIGHT FOR FLASH FLOODING AS PWATS AT 00Z ARE AROUND 1.51 --OVER 150 PERCENT OF NORMAL. GFS/NAM HAVE DIFFERENT SOLUTIONS WHERE THE HIGHEST PRECIPITATION AMOUNTS WILL OCCUR. GFS KEEPS PRECIP ALONG AND NORTH OF I-70 WHILE THE NAM PULLS IT SOUTH ALONG THE CO/KS BORDER. WILL CONTINUE MONITOR CI AND STORM MOTION AS WELL AS NEWEST MODEL RUNS TO GET A HANDLE WHERE HIGHEST PRECIP AMOUNTS WILL OCCUR AND MAKE FURTHER ADJUSTMENTS. MONDAY LOOKS TO BE THE HOTTEST DAY OF THE FORECAST PERIOD AS TEMPERATURES ARE EXPECTED TO WARM INTO THE MIDDLE UPPER 90S. MONDAY NIGHT INTO TUESDAY QUASI-ZONAL FLOW DAMPENS THE SURFACE HIGH AND NORTHWEST FLOW BRINGS RELIEF TO THE HIGH PLAINS. PREVIOUS FORECAST DESIGNED THE EXTENDED FORECAST WELL WITH A SERIES OF COLD FRONTS PUSHING THROUGH THE AREA GIVING WAY TO COOLER TEMPERATURES ALONG WITH AFTERNOON/EVENING THUNDERSTORMS. EXPECT HIGH TEMPERATURES TO WARM INTO THE UPPER 80S/LOWER 90S WITH LOWS IN THE LOWER 60S THROUGH THE END OF THE WORK WEEK. BURTIS && .AVIATION... 1156 AM MDT SUN JUL 12 2009 FOR THE 18Z TAF...WILL SEE GENERALLY VFR CONDITIONS THROUGH THE TAF PERIOD. CONVECTION WILL ONCE AGAIN DEVELOP OVER EASTERN COLORADO THIS AFTERNOON AND GRADUALLY TRANSLATE EASTWARD INTO NORTHWEST KANSAS AND SOUTHWEST NEBRASKA. HAVE INSERTED VCTS FOR BOTH TERMINALS BASED ON HIGHEST CONFIDENCE IN TIMING OF CONVECTION. CERTAINLY COULD SEE IFR CONDITIONS PERIODICALLY BUT LOW TEMPORAL AND SPATIAL CONFIDENCE WILL PRECLUDE PREVAILING PRECIP GROUP FOR THIS ISSUANCE. TIMING SHOULD BECOME MORE CLEAR FOR THE 00Z ISSUANCE. FOLTZ && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. NE...NONE. CO...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GOODLAND KS 1046 AM MDT SUN JUL 12 2009 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-131215- YUMA-KIT CARSON-CHEYENNE CO-CHEYENNE KS-RAWLINS-DECATUR-NORTON- SHERMAN-THOMAS-SHERIDAN-GRAHAM-WALLACE-LOGAN-GOVE-GREELEY-WICHITA- DUNDY-HITCHCOCK-RED WILLOW- 1046 AM MDT SUN JUL 12 2009 /1146 AM CDT SUN JUL 12 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR EXTREME SOUTHWEST NEBRASKA...NORTHWEST KANSAS AND EAST CENTRAL COLORADO. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP LATE THIS AFTERNOON IN EASTERN COLORADO MOVING EAST INTO WESTERN KANSAS AND SOUTHWEST NEBRASKA THIS EVENING. THE STRONGEST STORMS WILL BE CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WINDS AND LOCALLY HEAVY RAINFALL. THE GREATEST THREAT SHOULD REMAIN ALONG AND NORTH OF HIGHWAY 40. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE BOTH MONDAY AND TUESDAY AFTERNOON AND EVENING. STRONG WINDS AND LIGHTNING WILL BE THE MAIN THREATS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND EVENING.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GOODLAND KS 431 PM MDT SUN JUL 12 2009 COZ090-091-122300- KIT CARSON COUNTY-YUMA COUNTY- 431 PM MDT SUN JUL 12 2009 ...THE NATIONAL WEATHER SERVICE IN GOODLAND HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR KIT CARSON COUNTY IN EAST CENTRAL COLORADO AND YUMA COUNTY IN NORTHEAST COLORADO... AT 430 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR COPE...OR 8 MILES WEST OF JOES...AND MOVING SOUTHEAST AT 5 MPH. PENNY TO NICKEL SIZE HAIL...AND WINDS TO 50 MPH ARE EXPECTED WITH THIS STORM. BE PREPARED TO TAKE SHELTER IN THE EVENT THESE STORMS INTENSIFY AND BECOME SEVERE. MENTZER
The Goodland radar (KGLD), 97 km away, was scanning. The volume nearest the first event began at 23:08 UTC.
4 hail, 3 thunderstorm wind. Local standard time, as filed.
A slow-moving storm brought a prolonged period of large hail about 15 miles north of Seibert, Colorado. Cars were dented and shingles damaged. This event was reported by both the general public and a nearby cooperative observer.
Gust measured by cooperative observer's personal weather station.
Blowing dirt reduced visibility to two miles and at times down to one-half mile.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2009Every state in 2009This day in weather historyWarnings in Colorado, July 2009
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: 179415, 179416, 179419, 179417, 179420, 179418, 179421.