Tornadoes and Flash Flooding in Colorado, June 11, 2010

Name: Tornadoes and Flash Flooding in Colorado, June 11, 2010
Start: 2010-06-11T03:17
End: 2010-06-11T23:23
Location: Colorado

June 11, 2010 · NWS BOU · 48 events in 13 counties and zones

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $140,000
Crop damage: $400,000
Events: 48

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.

What happened

The episode as NWS BOU wrote it up.

A large complex of thunderstorms swept across Northeast Colorado producing very large damaging hail, intense thunderstorm winds as well as a couple of weak tornadoes. Large hail, from 1 to 3 inches in diameter, caused extensive damage to cropland, homes and vehicles. In southeast Weld County, 50,000 acres of cropland was pummelled. The combination of heavy rain and hail produced flash flooding over parts of Phillips and Weld Counties. Electrical outages were also reported in Weld County. Straight-line winds snapped 6 utility poles near Amherst in Phillips County. Two small tornado also touched down but no damage was reported.

What forecasters said that day

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 Denver/Boulder, CO wrote its last area forecast discussion before the first event at Jun 10, 2:30 PM MST, 12 hours 47 minutes earlier.

Area forecast discussion, Jun 10, 2:30 PM MST, 12 hours 47 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
330 PM MDT THU JUN 10 2010

.SHORT TERM...ANOTHER CHALLENGING CONVECTIVE DAY WITH A SUBSTANTIAL
CAP THAT IS IN PLACE OVER NORTHEASTERN COLORADO.  LBF 18Z SOUNDING
AND A 19Z VORTEX2 SOUNDING FROM STERLING BOTH SHOW THE STRONG CAP
THAT IS NOT LIKELY TO BE OVERCOME BY WARMING ALONE.  BUT WE DO HAVE
AN APPROACHING SHORTWAVE AND UPPER LEVEL FORCING THAT LOOKS LIKE IT
IS TIED TO THE SOUTHERN END OF A JET STREAK.  MODELS BRING THIS
RAPIDLY ACROSS THE AREA IN THE NEXT FEW HOURS.  THIS IS LIKELY WHY
WE HAVE SEEN THE INCREASE IN FORCED CLOUDINESS OVER THE MOUNTAINS
DURING THE LAST FEW HOURS.  LIGHTNING ALSO CLOSER TO THE WY BORDER
AND NOW IN A CELL WEST OF BOULDER.  ALSO...MAYBE A SLIGHT COOLING
TREND ALOFT IN THE LATEST ACARS SOUNDINGS.

THERE IS NO OBVIOUS BOUNDARY AT THIS TIME ON THE PLAINS AND IT SEEMS
THAT THE MOST LIKELY WAY THAT STORMS WILL END UP ON THE PLAINS WILL
BE AS THE CONVECTION NOW OVER THE FOOTHILLS MOVES EAST.  THE LATEST
NAM...RUC13 AND TREND ON THE HRRR HOURLY RUNS INDICATES THAT THIS IS
THE MOST LIKELY SCENARIO.  THERE IS GOOD DEEP VERTICAL WIND SHEAR
BUT THE LOW LEVEL FLOW ON THE PLAINS REMAINS RELATIVELY WEAK.
DEWPOINTS ARE CERTAINLY HIGH ON THE EASTERN PLAINS ALTHOUGH STILL
QUITE COOL AT AKO AND NEARBY AREAS THAT HAD ALL THE CLOUDS THIS
MORNING.  SO LIKELY WHAT WE WILL SE IS A BROKEN LINE OF CELLS COMING
OFF THE FOOTHILLS AND PUSHING EAST OVER THE NEXT COUPLE OF HOURS
NEAR THE FRONT RANGE AND THEN LINGERING INTO THE EVENING FARTHER
EAST.  WIND AND HAIL WOULD SEEM TO BE THE MAIN SEVERE THREATS AT
THIS TIME.

BIG UPPER LEVEL TROUGH WILL CONTINUE TO DEEPEN IN THE WEST AND CLOSE
OFF NEAR LAS VEGAS ON FRIDAY.  AT LOW LEVELS HIGH PRESSURE STILL IS
FORECAST TO BUILD SOUTHWARD FRIDAY WITH THE UPSLOPE GRADUALLY
DEEPENING.  PROBABLY WILL REMAIN TOO COOL FARTHER EAST ON THE PLAINS
FOR MUCH UNTIL LATE...BUT STILL LOOKS GOOD FOR WIDESPREAD STORMS
DEVELOPING ALONG THE FOOTHILLS FRIDAY AFTERNOON.  RIGHT NOW THE
CONCERN FOR HEAVY RAINS IS MOST PROMINENT  ESPECIALLY GIVEN THE
STAGE OF CREEKS AND RIVERS AT THIS TIME BUT CERTAINLY CANNOT RULE
OUT SEVERE FOR FRIDAY AFTERNOON ALONG THE FRONT RANGE.

.LONG TERM...CAN NOT STATE IT ANY CLEARER...A COMPLEX WEATHER
FORECAST NEXT FEW DAYS TO SAY THE LEAST. ALL STARTS WITH DEEPENING
MOIST...UNSEASONABLY COOL UPSLOPE FLOW FRONT RANGE EASTWARD FRIDAY
AFTERNOON INTO FRIDAY NIGHT. WHILE WEST OF THE CONTINENTAL DIVIDE A
MUCH DRIER AND WARMER ENVIRONMENT WILL PREVAIL WITH PERSISTENT
DOWNSLOPE AND/OR GUSTY SWLY FLOW. MODELS INDICATE MODERATELY STRONG
QUASI-GEOSTROPHIC LARGE SCALE ASCENT MOVING OVER THE FCST REGION
FRIDAY NIGHT IN ADVANCE OF THE DEEP UPPER LEVEL CYCLONE APPROACHING
THE 4-CORNERS AREA. CAPE VALUES FRIDAY EVENING APPROACH 2000 J/KG
ALONG EAST SLOPE OF THE FRONT RANGE AND MID-LEVEL LAPSE RATES
STEEPEN WITH COOLING ALOFT. EVENING MEAN PRECIPITABLE WATER VALUES
ON THE PLAINS CREEP UP INTO 1.0-1.4 INCH RANGE AND WITH 10-20KTS OF
LOW-LEVEL EASTERLY UPSLOPE FLOW...COULD SEE A NUMBER OF HOURS OF
DEEP CONVECTION CAPABLE OF MODERATE TO HEAVY RAINFALL AND POSSIBLY
SMALL HAIL. QPF VALUES DIFFER FROM ONE MODEL TO THE NEXT BUT ALL
INDICATE 6-HR AND 12-HR QPF VALUES IN THE 0.5 TO 1.5 INCH
RANGE...WITH A BULLS EYE OVER AND NEAR THE NRN FRONT RANGE FTHLS
AROUND 06Z/SAT. PERSISTENT UPSLOPE FLOW SHOULD CONCENTRATE THE
HEAVIER CONVECTIVE PRECIPITATION OVER AND NEAR THE FRONT RANGE
FOOTHILLS FRIDAY NIGHT. HEAVIER RAINFALL MAY EXACERBATE THE FLOODING
NOW OCCURRING ON SMALL STREAMS AND CREEKS IN AND ALONG THE FRONT
RANGE. SHOULD ONE OF THESE HEAVY RAIN MAKERS SIT OVER A DRAINAGE
BASIN FOR 30 MINUTES TO AN HOUR...COULD SEE SERIOUS HIGH WATER RISES
ON CREEKS IN THE AREA.

SATURDAY...MODELS SHOW A SECOND REINFORCING SURGE OF UNSEASONABLY
COOL AND MOIST AIR MOVING SOUTHWARD ACROSS NERN COLORADO DURING THE
MORNING HRS. EXTENSIVE LOW-LEVEL CLOUD COVER AND CHILLY BNDRY LAYER
TEMPERATURES SHOULD PRETTY MUCH SQUELCH THUNDERSTORM FORMATION ON
THE PLAINS SATURDAY. WHEREAS HIGH COUNTRY AREAS ABOVE THIS FRONTAL
AIRMASS SHOULD MANAGE TO HEAT UP AND DESTABILIZE ENOUGH FOR
SCATTERED T-STORMS. ALTHOUGH ITS PROBABLY NOT UNTIL THE AFTERNOON
WHEN MOST OF THIS CONVECTION SHOULD DEVELOP. DRASTIC COOL DOWN
PROBABLY THE MOST NOTABLE CHANGE IN OUR WEATHER THIS WEEKEND.
TEMPERATURE MOS GUIDANCE INDICATE MAX TEMPS IN THE MID 50S TO LOWER
60S ON THE PLAINS BOTH DAYS. THAT/S AT LEAST 20 DEGS F BELOW NORMAL.

SATURDAY INTO SUNDAY...DEEP UPPER TROUGH AND CYCLONE TO OUR WEST/
SOUTHWEST SLOWLY MIGRATES NORTHEASTWARD ACROSS THE REGION DURING THE
PD. BEST LARGE SCALE FORCING AND STEEPEST MID-LEVEL LAPSE RATES OVER
THE AREA SUNDAY MORNING. TEMPERATURES ALOFT STEADILY COOL SAT NIGHT
WITH 700 MB TEMPS IN THE -2 TO -3C RANGE OVER AND JUST EAST OF THE
FRONT RANGE SUNDAY MORNING. MODEL SNOW FIELDS INDICATE SEVERAL
INCHES OF SNOW ACCUMULATION OVER THE LARAMIE AND FRONT RANGES
ROUGHLY ABOVE 9500 FT MSL...WITH A MIX OF RAIN AND SNOW BELOW THAT
DOWN TO AROUND 8000 FT MST. NAM INDICATES UPWARD OF A HALF FOOT OF
SNOW OVER THE HIGHEST ELEVATIONS IN LARIMER AND BOULDER COUNTIES BY
MIDDAY SUNDAY. REALLY CAN/T ARGUE WITH THIS.

DURING THE DAY SUNDAY...MOST MODELS SHOW THE UPPER TROUGH AND MOST
OF ITS ENERGY AND PRECIPITATION MOVING OUT OF THE AREA. ALTHOUGH IT
STILL REMAINS QUITE COOL ESPLY EAST OF THE MTNS.

NEXT WEEK...SHOULD SEE A TREND TOWARDS DRIER AND WARMER CONDITIONS
WITH A RETURN TO NEAR ZONAL FLOW AND WEAK SUBSIDENCE ALOFT.

&&

.AVIATION...LINE OF SCATTERED TSTMS EXPECTED TO MOVE OFF THE
FOOTHILLS OVER THE NEXT FEW HOURS WITH STRONG WINDS AND HAIL THE
MAIN THREAT.  MOST OF THIS SHOULD BE EAST OF THE AIRPORTS BY 02 TO
03Z.  SOME PATCHY FOG POSSIBLE AT DIA AFTER 08Z ALONG WITH BROKEN
LOW CLOUDS WITH POSSIBLE CIGS NEAR 3000 FT.  CLOUDS SHOULD BREAK UP
ON FRIDAY SLOWLY THEN A THREAT OF STORMS AFTER 21Z.

&&

.HYDROLOGY...OVERBANK STREAMFLOW WILL CONTINUE ON STREAMS IN
LARIMER...BOULDER...AND WELD COUNTIES. WARMER TEMPERATURES IN THE
HIGH COUNTRY MAY BRING A SLIGHT INCREASE IN RUNOFF TONIGHT.
WIDESPREAD RAIN WILL DEVELOP OVER THE REGION FRIDAY...WITH HEAVIEST
RAINFALL AMOUNTS EXPECTED ON FRIDAY NIGHT AND SATURDAY. LOOK FOR 1
TO 2 INCHES AND ISOLATED HIGHER AMOUNTS FRIDAY AFTERNOON THROUGH
SUNDAY. THIS MAY CAUSE STREAMS TO RISE BACK TO LEVELS SEEN EARLIER
THIS WEEK.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...FLOOD ADVISORIES FOR RIVERS AND
STREAMS IN PORTIONS OF LARIMER...BOULDER...AND...WELD COUNTIES.

...FLOOD WATCH 6PM MDT FRIDAY THROUGH 6AM MDT SUNDAY FOR THE
NORTHERN FOOTHILLS AND NORTHERN PARTS OF THE URBAN CORRIDOR...ZONES
35..38..39..42..43...

SZOKE/BAKER

Hazardous weather outlook, Jun 10, 10:44 AM MST, 16 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
1144 AM MDT THU JUN 10 2010

COZ030>051-111200-
JACKSON COUNTY BELOW 9000 FEET-WEST JACKSON AND WEST GRAND
COUNTIES ABOVE 9000 FEET-GRAND AND SUMMIT COUNTIES BELOW 9000
FEET-SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-SOUTH AND SOUTHEAST
GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/GILPIN/CLEAR CREEK/
SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET-LARIMER AND
BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-JEFFERSON AND WEST
DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK
COUNTIES BELOW 9000 FEET-CENTRAL AND SOUTHEAST PARK COUNTY-LARIMER
COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-BOULDER AND JEFFERSON
COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY-NORTH DOUGLAS
COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/
EAST BROOMFIELD COUNTY-ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES
ABOVE 6000 FEET-NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD
COUNTY-MORGAN COUNTY-CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN
COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS
COUNTY-
1144 AM MDT THU JUN 10 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

A SURGE OF NORTHERLY WINDS MOVED THROUGH THE AREA THIS MORNING AND
ALONG WITH SOME CLOUDINESS THIS HAS TEMPORARILY STABILIZED THE LOWER
ATMOSPHERE.  HOWEVER CONDITIONS SHOULD BECOME MORE UNSTABLE DURING
THIS AFTERNOON WITH INCREASING SUNSHINE AND WINDS BECOMING MORE
EASTERLY AS A LOW PRESSURE STRENGTHENS NEAR THE PALMER DIVIDE.  IN
ADDITION AN APPROACHING WEAK UPPER LEVEL DISTURBANCE WILL HELP TO
COOL CONDITIONS ALOFT LATER TODAY.  SO THE INGREDIENTS WILL BE IN
PLACE FOR POTENTIAL SEVERE STORMS LATER THIS AFTERNOON AND THIS
EVENING.  THE STORMS SHOULD DEVELOP IF THE MID LEVEL CAPPING
INVERSION CAN BE OVERCOME.  THE GREATEST THREAT IS EXPECTED TO BE
MORE IN THE NORTHEAST CORNER OF THE AREA WHERE SUPERCELL STORMS ARE
POSSIBLE BY LATE TODAY WITH ISOLATED TORNADOES.  OTHERWISE THE MAIN
THREAT SHOULD BE HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS UP TO
70 MPH MAINLY NORTH OF INTERSTATE 70.

HIGH WATER WILL CONTINUE ON RIVERS IN LARIMER...BOULDER...AND WELD
COUNTIES. WARMER TEMPERATURES IN THE HIGH COUNTRY MAY BRING A SLIGHT
INCREASE IN RUNOFF TONIGHT.  SEE THE LATEST FLOOD STATEMENTS AND
ADVISORIES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

TEMPERATURES TURN STEADILY COOLER ON FRIDAY AND EVEN COLDER THIS
WEEKEND AS MOIST UPSLOPE FLOW BEHIND A COUPLE OF STRONG COLD FRONTS
COMBINE WITH THE LIFT AND INSTABILITY PRODUCED BY AN UNUSUALLY COOL
AND MOIST UPPER LEVEL STORM SYSTEM WHICH PASSES OVER THE REGION THIS
WEEKEND. SCATTERED THUNDERSTORMS DEVELOPING FRIDAY AFTERNOON
FOLLOWING PASSAGE OF THE FIRST OF TWO COLD FRONTS MAY PRODUCE
PERIODS OF MODERATE TO HEAVY RAINFALL AND SMALL HAIL ON THE
PLAINS...PARTICULARLY ALONG THE FRONT RANGE. A SECOND REINFORCING
SURGE OF UNSEASONABLY COOL AND MOIST AIR ARRIVING SATURDAY MORNING
IS EXPECTED TO PRODUCE EXTENSIVE LOW CLOUDINESS AND PERIODS OF LIGHT
TO MODERATE RAINFALL FROM THE FRONT RANGE EASTWARD THROUGH SATURDAY
NIGHT. TEMPERATURES ON THE PLAINS SATURDAY AND SUNDAY WILL BE
UNSEASONABLY COOL FOR JUNE WITH DAYTIME READINGS STRUGGLING TO REACH
THE 60 DEGREE BOTH DAYS. HIGH COUNTRY AREAS GENERALLY WEST OF THE
CONTINENTAL DIVIDE SHOULD SEE LITTLE TEMPERATURE CHANGE UNTIL THIS
WEEKEND. SATURDAY NIGHT INTO SUNDAY HIGH COUNTRY AREAS GENERALLY
ABOVE 8000 FEET COULD SEE A MIXTURE OF RAIN AND SNOW...WITH SEVERAL
INCHES OF SNOW ACCUMULATION POSSIBLE OVER EAST SLOPES OF THE FRONT
RANGE ROUGHLY ABOVE 9500 FEET BY SUNDAY AFTERNOON. SCATTERED RAIN
SHOWERS AND THUNDERSTORMS WILL AGAIN DEVELOP AT LOWER ELEVATIONS ON
SUNDAY WITH PASSAGE OF THE MAIN STORM SYSTEM TO OUR WEST. DRIER AND
WARMER CONDITIONS SHOULD RETURN TO THE OUTLOOK AREA FOR NEXT
WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED FOR LATER THIS AFTERNOON
AND THIS EVENING.

SZOKE/BAKER

In the hours before

Local storm report, Jun 10, 9:57 PM MST, 5 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
1057 PM MDT THU JUN 10 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1056 PM     HAIL             10 E ELBA               39.92N 102.99W
06/10/2010  M1.50 INCH       WASHINGTON         CO   TRAINED SPOTTER

&&

BLOUIS

Local storm report, Jun 10, 10:09 PM MST, 5 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
1109 PM MDT THU JUN 10 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1056 PM     HAIL             10 E ELBA               39.92N 102.99W
06/10/2010  M1.50 INCH       WASHINGTON         CO   TRAINED SPOTTER

1050 PM     HAIL             5 ESE ELBA              39.90N 103.09W
06/10/2010  M1.00 INCH       WASHINGTON         CO   TRAINED SPOTTER

1045 PM     HAIL             1 S ELBA                39.91N 103.18W
06/10/2010  M1.50 INCH       WASHINGTON         CO   TRAINED SPOTTER

1031 PM     HAIL             5 NNW HOLYOKE           40.66N 102.33W
06/10/2010  M0.88 INCH       PHILLIPS           CO   TRAINED SPOTTER

1019 PM     HAIL             8 NNE WOODLIN SCHOOL    39.89N 103.46W
06/10/2010  M0.88 INCH       WASHINGTON         CO   TRAINED SPOTTER

0942 PM     HAIL             4 ESE SHAMROCK          39.85N 103.74W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0938 PM     HAIL             4 SSE AURORA            39.65N 104.79W
06/10/2010  M1.75 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0927 PM     TORNADO          21 SE AKRON             39.95N 102.93W
06/10/2010                   WASHINGTON         CO   PUBLIC

0851 PM     HAIL             3 S ELBA                39.88N 103.18W
06/10/2010  M1.50 INCH       WASHINGTON         CO   PUBLIC

0820 PM     HAIL             5 SE ROGGEN             40.11N 104.30W
06/10/2010  M1.75 INCH       WELD               CO   TRAINED SPOTTER

0817 PM     HAIL             3 NNE BYERS             39.75N 104.21W
06/10/2010  E1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0817 PM     HAIL             3 NNE BYERS             39.75N 104.21W
06/10/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0745 PM     HAIL             7 SE ROGGEN             40.10N 104.28W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0745 PM     HAIL             7 SE ROGGEN             40.10N 104.28W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0730 PM     HAIL             1 W PROSPECT VALLEY     40.07N 104.43W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0710 PM     TORNADO          4 NE DEER TRAIL         39.66N 103.99W
06/10/2010                   ARAPAHOE           CO   TRAINED SPOTTER

0700 PM     HAIL             3 NE DEER TRAIL         39.65N 104.00W
06/10/2010  E2.50 INCH       ARAPAHOE           CO   AMATEUR RADIO

0700 PM     HAIL             3 NNE DEER TRAIL        39.66N 104.02W
06/10/2010  M2.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0659 PM     HAIL             N DEER TRAIL            39.62N 104.04W
06/10/2010  M3.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0656 PM     HAIL             2 N DEER TRAIL          39.65N 104.04W
06/10/2010  M2.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0656 PM     HAIL             2 SSE LOCHBUIE          39.98N 104.70W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0656 PM     HAIL             2 SSE LOCHBUIE          39.98N 104.70W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0653 PM     HAIL             2 NE DEER TRAIL         39.64N 104.02W
06/10/2010  M1.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0650 PM     HAIL             2 S DEER TRAIL          39.59N 104.04W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   PUBLIC

0650 PM     HAIL             2 NE THORNTON           39.92N 104.93W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0644 PM     HAIL             1 S BYERS               39.70N 104.22W
06/10/2010  M1.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0644 PM     HAIL             3 WSW ARAPAHOE PARK     39.62N 104.74W
06/10/2010  M1.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0636 PM     HAIL             4 SSE BYERS             39.65N 104.19W
06/10/2010  U2.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0632 PM     HAIL             THORNTON                39.89N 104.96W
06/10/2010  M1.00 INCH       ADAMS              CO   PUBLIC

0632 PM     HAIL             7 S BENNETT             39.65N 104.42W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0632 PM     HAIL             2 ENE CASTLE ROCK       39.39N 104.82W
06/10/2010  M2.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0627 PM     HAIL             5 N DENVER              39.80N 104.96W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0625 PM     HAIL             3 SSE HOYT              39.98N 104.04W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0625 PM     HAIL             3 SSE HOYT              39.98N 104.04W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0620 PM     HAIL             2 WSW STRASBURG         39.73N 104.34W
06/10/2010  M1.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0609 PM     HAIL             14 ENE GROVER           40.95N 103.98W
06/10/2010  M1.50 INCH       WELD               CO   STORM CHASER

0553 PM     HAIL             8 SE ARAPAHOE PARK      39.54N 104.59W
06/10/2010  M1.50 INCH       ELBERT             CO   TRAINED SPOTTER

0540 PM     HAIL             1 SSE PONDEROSA PARK    39.38N 104.62W
06/10/2010  M3.00 INCH       ELBERT             CO   TRAINED SPOTTER

0520 PM     HAIL             2 ESE PARKER            39.49N 104.73W
06/10/2010  M1.50 INCH       DOUGLAS            CO   TRAINED SPOTTER

            FUNNEL CLOUD

0518 PM     HAIL             NE CASTLE ROCK          39.38N 104.85W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0515 PM     HAIL             4 SSE PARKER            39.46N 104.74W
06/10/2010  M1.25 INCH       DOUGLAS            CO   TRAINED SPOTTER

0514 PM     HAIL             1 SSE PONDEROSA PARK    39.38N 104.62W
06/10/2010  M2.00 INCH       ELBERT             CO   TRAINED SPOTTER

0514 PM     HAIL             2 NW DEER TRAIL         39.64N 104.07W
06/10/2010  M3.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

            HAIL 3.5 INCHES

0513 PM     HAIL             1 ENE PARKER            39.51N 104.75W
06/10/2010  M1.25 INCH       DOUGLAS            CO   TRAINED SPOTTER

0512 PM     HAIL             HUGO                    39.13N 103.47W
06/10/2010  E1.75 INCH       LINCOLN            CO   LAW ENFORCEMENT

0511 PM     HAIL             2 ESE PARKER            39.49N 104.73W
06/10/2010  M0.50 INCH       DOUGLAS            CO   TRAINED SPOTTER

0510 PM     HAIL             2 S HUGO                39.11N 103.47W
06/10/2010  M1.00 INCH       LINCOLN            CO   PUBLIC

0509 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0509 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0506 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0458 PM     HAIL             3 NW PARKER             39.53N 104.81W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0458 PM     HAIL             3 NW PARKER             39.53N 104.81W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

&&

GIMMESTAD

Local storm report, Jun 10, 11:08 PM MST, 4 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
1208 AM MDT FRI JUN 11 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1056 PM     HAIL             10 E ELBA               39.92N 102.99W
06/10/2010  M1.50 INCH       WASHINGTON         CO   TRAINED SPOTTER

1050 PM     HAIL             5 ESE ELBA              39.90N 103.09W
06/10/2010  M1.00 INCH       WASHINGTON         CO   TRAINED SPOTTER

1045 PM     HAIL             1 S ELBA                39.91N 103.18W
06/10/2010  M1.50 INCH       WASHINGTON         CO   TRAINED SPOTTER

1031 PM     HAIL             5 NNW HOLYOKE           40.66N 102.33W
06/10/2010  M0.88 INCH       PHILLIPS           CO   TRAINED SPOTTER

1019 PM     HAIL             8 NNE WOODLIN SCHOOL    39.89N 103.46W
06/10/2010  M0.88 INCH       WASHINGTON         CO   TRAINED SPOTTER

0942 PM     HAIL             4 ESE SHAMROCK          39.85N 103.74W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0938 PM     HAIL             4 SSE AURORA            39.65N 104.79W
06/10/2010  M1.75 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0927 PM     TORNADO          21 SE AKRON             39.95N 102.93W
06/10/2010                   WASHINGTON         CO   PUBLIC

0851 PM     HAIL             3 S ELBA                39.88N 103.18W
06/10/2010  M1.50 INCH       WASHINGTON         CO   PUBLIC

0820 PM     HAIL             5 SE ROGGEN             40.11N 104.30W
06/10/2010  M1.75 INCH       WELD               CO   TRAINED SPOTTER

0817 PM     HAIL             3 NNE BYERS             39.75N 104.21W
06/10/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0817 PM     HAIL             3 NNE BYERS             39.75N 104.21W
06/10/2010  E1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0746 PM     TORNADO          1 E LAST CHANCE         39.73N 103.56W
06/10/2010                   WASHINGTON         CO   STORM CHASER

            OBSERVED BY STORM CHASER CAM. NO DAMAGE REPORTED.

0745 PM     HAIL             7 SE ROGGEN             40.10N 104.28W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0745 PM     HAIL             7 SE ROGGEN             40.10N 104.28W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0730 PM     HAIL             1 W PROSPECT VALLEY     40.07N 104.43W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0715 PM     HAIL             2 SSW THORNTON          39.86N 104.97W
06/10/2010  M0.88 INCH       ADAMS              CO   TRAINED SPOTTER

0710 PM     TORNADO          4 NE DEER TRAIL         39.66N 103.99W
06/10/2010                   ARAPAHOE           CO   TRAINED SPOTTER

            ON GROUND FOR 8-10 MINUTES, DISSIPATED FOR APPROXIMATELY
            5 MINUTES, THEN REFORMED AND WAS ON THE GROUND ANOTHER
            6-8 MINUTES. NO DAMAGE REPORTED.

0700 PM     HAIL             3 NNE DEER TRAIL        39.66N 104.02W
06/10/2010  M2.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0700 PM     HAIL             3 NE DEER TRAIL         39.65N 104.00W
06/10/2010  E2.50 INCH       ARAPAHOE           CO   AMATEUR RADIO

0659 PM     HAIL             N DEER TRAIL            39.62N 104.04W
06/10/2010  M3.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0656 PM     HAIL             2 N DEER TRAIL          39.65N 104.04W
06/10/2010  M2.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0656 PM     HAIL             2 SSE LOCHBUIE          39.98N 104.70W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0656 PM     HAIL             2 SSE LOCHBUIE          39.98N 104.70W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0653 PM     HAIL             2 NE DEER TRAIL         39.64N 104.02W
06/10/2010  M1.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0650 PM     HAIL             2 S DEER TRAIL          39.59N 104.04W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   PUBLIC

0650 PM     HAIL             2 NE THORNTON           39.92N 104.93W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0644 PM     HAIL             3 WSW ARAPAHOE PARK     39.62N 104.74W
06/10/2010  M1.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0644 PM     HAIL             1 S BYERS               39.70N 104.22W
06/10/2010  M1.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0636 PM     HAIL             4 SSE BYERS             39.65N 104.19W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0632 PM     HAIL             2 ENE CASTLE ROCK       39.39N 104.82W
06/10/2010  M2.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0632 PM     HAIL             7 S BENNETT             39.65N 104.42W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0632 PM     HAIL             THORNTON                39.89N 104.96W
06/10/2010  M1.00 INCH       ADAMS              CO   PUBLIC

0627 PM     HAIL             5 N DENVER              39.80N 104.96W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0625 PM     HAIL             3 SSE HOYT              39.98N 104.04W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0625 PM     HAIL             3 SSE HOYT              39.98N 104.04W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0620 PM     HAIL             2 WSW STRASBURG         39.73N 104.34W
06/10/2010  M1.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0609 PM     HAIL             14 ENE GROVER           40.95N 103.98W
06/10/2010  M1.50 INCH       WELD               CO   STORM CHASER

0553 PM     HAIL             8 SE ARAPAHOE PARK      39.54N 104.59W
06/10/2010  M1.50 INCH       ELBERT             CO   TRAINED SPOTTER

0540 PM     HAIL             1 SSE PONDEROSA PARK    39.38N 104.62W
06/10/2010  M3.00 INCH       ELBERT             CO   TRAINED SPOTTER

0520 PM     HAIL             2 ESE PARKER            39.49N 104.73W
06/10/2010  M1.50 INCH       DOUGLAS            CO   TRAINED SPOTTER

            FUNNEL CLOUD

0518 PM     HAIL             NE CASTLE ROCK          39.38N 104.85W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0515 PM     HAIL             4 SSE PARKER            39.46N 104.74W
06/10/2010  M1.25 INCH       DOUGLAS            CO   TRAINED SPOTTER

0514 PM     HAIL             2 NW DEER TRAIL         39.64N 104.07W
06/10/2010  M3.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

            MAX HAIL SIZE WAS 3.5 INCH DIAMETER.

0514 PM     HAIL             1 SSE PONDEROSA PARK    39.38N 104.62W
06/10/2010  M2.00 INCH       ELBERT             CO   TRAINED SPOTTER

0513 PM     HAIL             1 ENE PARKER            39.51N 104.75W
06/10/2010  M1.25 INCH       DOUGLAS            CO   TRAINED SPOTTER

0512 PM     HAIL             HUGO                    39.13N 103.47W
06/10/2010  E1.75 INCH       LINCOLN            CO   LAW ENFORCEMENT

0511 PM     HAIL             2 ESE PARKER            39.49N 104.73W
06/10/2010  M0.50 INCH       DOUGLAS            CO   TRAINED SPOTTER

0510 PM     HAIL             2 S HUGO                39.11N 103.47W
06/10/2010  M1.00 INCH       LINCOLN            CO   PUBLIC

0509 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0509 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0506 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0458 PM     HAIL             3 NW PARKER             39.53N 104.81W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0458 PM     HAIL             3 NW PARKER             39.53N 104.81W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

&&

DB

Local storm report, Jun 11, 12:28 AM MST, 2 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
128 AM MDT FRI JUN 11 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1056 PM     HAIL             10 E ELBA               39.92N 102.99W
06/10/2010  M1.50 INCH       WASHINGTON         CO   TRAINED SPOTTER

1050 PM     HAIL             5 ESE ELBA              39.90N 103.09W
06/10/2010  M1.00 INCH       WASHINGTON         CO   TRAINED SPOTTER

1045 PM     HAIL             1 S ELBA                39.91N 103.18W
06/10/2010  M1.50 INCH       WASHINGTON         CO   TRAINED SPOTTER

1031 PM     HAIL             5 NNW HOLYOKE           40.66N 102.33W
06/10/2010  M0.88 INCH       PHILLIPS           CO   TRAINED SPOTTER

1019 PM     HAIL             8 NNE WOODLIN SCHOOL    39.89N 103.46W
06/10/2010  M0.88 INCH       WASHINGTON         CO   TRAINED SPOTTER

0942 PM     HAIL             4 ESE SHAMROCK          39.85N 103.74W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0938 PM     HAIL             4 SSE AURORA            39.65N 104.79W
06/10/2010  M1.75 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0927 PM     TORNADO          21 SE AKRON             39.95N 102.93W
06/10/2010                   WASHINGTON         CO   PUBLIC

0851 PM     HAIL             3 S ELBA                39.88N 103.18W
06/10/2010  M1.50 INCH       WASHINGTON         CO   PUBLIC

0820 PM     HAIL             5 SE ROGGEN             40.11N 104.30W
06/10/2010  M1.75 INCH       WELD               CO   TRAINED SPOTTER

0817 PM     HAIL             3 NNE BYERS             39.75N 104.21W
06/10/2010  E1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0817 PM     HAIL             3 NNE BYERS             39.75N 104.21W
06/10/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0746 PM     TORNADO          1 E LAST CHANCE         39.73N 103.56W
06/10/2010                   WASHINGTON         CO   STORM CHASER

            OBSERVED BY STORM CHASER CAM. NO DAMAGE REPORTED.

0745 PM     HAIL             7 SE ROGGEN             40.10N 104.28W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0745 PM     HAIL             7 SE ROGGEN             40.10N 104.28W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0735 PM     HAIL             12 WSW LAST CHANCE      39.67N 103.80W
06/10/2010  M4.25 INCH       ARAPAHOE           CO   STORM CHASER

            4 TO 5 INCH DIAMETER HAIL. BROKEN TRUCK WINDOWS. TIME
            APPROXIMATE.

0730 PM     HAIL             1 W PROSPECT VALLEY     40.07N 104.43W
06/10/2010  M1.50 INCH       WELD               CO   TRAINED SPOTTER

0720 PM     TORNADO          1 SSW PROSPECT VALLEY   40.06N 104.42W
06/10/2010                   WELD               CO   STORM CHASER

0715 PM     HAIL             2 SSW THORNTON          39.86N 104.97W
06/10/2010  M0.88 INCH       ADAMS              CO   TRAINED SPOTTER

0710 PM     TORNADO          4 NE DEER TRAIL         39.66N 103.99W
06/10/2010                   ARAPAHOE           CO   TRAINED SPOTTER

            ON GROUND FOR 8-10 MINUTES, DISSIPATED FOR APPROXIMATELY
            5 MINUTES, THEN REFORMED AND WAS ON THE GROUND ANOTHER
            6-8 MINUTES. NO DAMAGE REPORTED.

0700 PM     HAIL             3 NNE DEER TRAIL        39.66N 104.02W
06/10/2010  M2.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0700 PM     HAIL             3 NE DEER TRAIL         39.65N 104.00W
06/10/2010  E2.50 INCH       ARAPAHOE           CO   AMATEUR RADIO

0659 PM     HAIL             N DEER TRAIL            39.62N 104.04W
06/10/2010  M3.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0656 PM     HAIL             2 SSE LOCHBUIE          39.98N 104.70W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0656 PM     HAIL             2 N DEER TRAIL          39.65N 104.04W
06/10/2010  M2.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0656 PM     HAIL             2 SSE LOCHBUIE          39.98N 104.70W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0653 PM     HAIL             2 NE DEER TRAIL         39.64N 104.02W
06/10/2010  M1.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0650 PM     HAIL             2 S DEER TRAIL          39.59N 104.04W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   PUBLIC

0650 PM     HAIL             2 NE THORNTON           39.92N 104.93W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0644 PM     HAIL             3 WSW ARAPAHOE PARK     39.62N 104.74W
06/10/2010  M1.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0644 PM     HAIL             1 S BYERS               39.70N 104.22W
06/10/2010  M1.50 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0636 PM     HAIL             4 SSE BYERS             39.65N 104.19W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0632 PM     HAIL             2 ENE CASTLE ROCK       39.39N 104.82W
06/10/2010  M2.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0632 PM     HAIL             THORNTON                39.89N 104.96W
06/10/2010  M1.00 INCH       ADAMS              CO   PUBLIC

0632 PM     HAIL             7 S BENNETT             39.65N 104.42W
06/10/2010  M2.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0627 PM     HAIL             5 N DENVER              39.80N 104.96W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0625 PM     HAIL             3 SSE HOYT              39.98N 104.04W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0625 PM     HAIL             3 SSE HOYT              39.98N 104.04W
06/10/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0620 PM     HAIL             2 WSW STRASBURG         39.73N 104.34W
06/10/2010  M1.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0609 PM     HAIL             14 ENE GROVER           40.95N 103.98W
06/10/2010  M1.50 INCH       WELD               CO   STORM CHASER

0553 PM     HAIL             8 SE ARAPAHOE PARK      39.54N 104.59W
06/10/2010  M1.50 INCH       ELBERT             CO   TRAINED SPOTTER

0540 PM     HAIL             1 SSE PONDEROSA PARK    39.38N 104.62W
06/10/2010  M3.00 INCH       ELBERT             CO   TRAINED SPOTTER

0520 PM     HAIL             2 ESE PARKER            39.49N 104.73W
06/10/2010  M1.50 INCH       DOUGLAS            CO   TRAINED SPOTTER

            FUNNEL CLOUD

0518 PM     HAIL             NE CASTLE ROCK          39.38N 104.85W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0515 PM     HAIL             4 SSE PARKER            39.46N 104.74W
06/10/2010  M1.25 INCH       DOUGLAS            CO   TRAINED SPOTTER

0514 PM     HAIL             1 SSE PONDEROSA PARK    39.38N 104.62W
06/10/2010  M2.00 INCH       ELBERT             CO   TRAINED SPOTTER

0514 PM     HAIL             2 NW DEER TRAIL         39.64N 104.07W
06/10/2010  M3.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

            MAX HAIL SIZE WAS 3.5 INCH DIAMETER.

0513 PM     HAIL             1 ENE PARKER            39.51N 104.75W
06/10/2010  M1.25 INCH       DOUGLAS            CO   TRAINED SPOTTER

0512 PM     HAIL             HUGO                    39.13N 103.47W
06/10/2010  E1.75 INCH       LINCOLN            CO   LAW ENFORCEMENT

0511 PM     HAIL             2 ESE PARKER            39.49N 104.73W
06/10/2010  M0.50 INCH       DOUGLAS            CO   TRAINED SPOTTER

0510 PM     HAIL             2 S HUGO                39.11N 103.47W
06/10/2010  M1.00 INCH       LINCOLN            CO   PUBLIC

0509 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0509 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0506 PM     HAIL             2 S PARKER              39.48N 104.76W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0458 PM     HAIL             3 NW PARKER             39.53N 104.81W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0458 PM     HAIL             3 NW PARKER             39.53N 104.81W
06/10/2010  M1.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

&&

GIMMESTAD

The radar

The Denver radar (KFTG), 29 km away, was scanning. The volume nearest the first event began at 10:18 UTC.

Open the radar archive at this moment

Event by event

33 hail, 7 thunderstorm wind, 6 flash flood, 2 tornado. Local standard time, as filed.

Thunderstorm Wind, Weld

When: June 11, 3:17 AM MST
Where: Weld County, 2.23 mi WSW of Tonville
Measured: 52 kt (60 mph) measured gust
Reported by: Trained Spotter
Coordinates: 40.010, -104.720

Thunderstorm Wind, Logan

When: June 11, 6:59 AM MST
Where: Logan County, 6.11 mi NNW of Crook
Measured: 52 kt (60 mph) measured gust
Reported by: Trained Spotter
Coordinates: 40.930, -102.850

Hail, Jefferson

When: June 11, 12:48 PM MST
Where: Jefferson County, 1.74 mi WSW of Arvada
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.790, -105.110

Hail, Jefferson

When: June 11, 2:02 PM MST
Where: Jefferson County, Evergreen
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.630, -105.320

Hail, Jefferson

When: June 11, 2:05 PM MST
Where: Jefferson County, 0.53 mi E of Wah Keeney Park
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.650, -105.320

Hail, Clear Creek

When: June 11, 2:10 PM MST
Where: Clear Creek County, 9.59 mi SE of Idaho Spgs
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.640, -105.410

Hail, Jefferson

When: June 11, 2:10 PM MST
Where: Jefferson County, 6.4 mi SSW of Golden
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.664, -105.266

Hail, Jefferson

When: June 11, 2:14 PM MST
Where: Jefferson County, 3.37 mi NW of Idledale
Measured: 1.5 in hail
Reported by: Trained Spotter
Coordinates: 39.700, -105.280

Hail, Jefferson

When: June 11, 2:31 PM MST
Where: Jefferson County, 1.27 mi WNW of Mountain View
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 39.780, -105.090

Hail, Jefferson

When: June 11, 2:40 PM MST
Where: Jefferson County, Mountain View
Measured: 1.25 in hail
Reported by: Trained Spotter
Coordinates: 39.770, -105.070

Hail, Boulder

When: June 11, 2:43 PM MST
Where: Boulder County, 1.74 mi NW of Lafayette
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 40.020, -105.100

Hail, Douglas

When: June 11, 2:53 PM MST
Where: Douglas County, 2.76 mi N of Orsa
Measured: 1.5 in hail
Reported by: Trained Spotter
Coordinates: 39.460, -104.900

Hail, Adams

When: June 11, 3:00 PM MST
Where: Adams County, 1.27 mi ESE of Henderson
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.910, -104.850

Hail, Adams

When: June 11, 3:11 PM MST
Where: Adams County, 0.69 mi N of Thornton
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 39.890, -104.950

Hail, Adams

When: June 11, 3:15 PM MST
Where: Adams County, 1.26 mi ENE of Brighton
Measured: 2.5 in hail
Reported by: Trained Spotter
Coordinates: 39.990, -104.800

Hail, Adams

When: June 11, 3:25 PM MST
Where: Adams County, 6.68 mi ENE of Barr Lake
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.980, -104.660

Hail, Adams

When: June 11, 3:56 PM MST
Where: Adams County, 16.28 mi NNE of Manila
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 39.990, -104.390

Thunderstorm Wind, Weld

When: June 11, 4:06 PM MST
Where: Weld County, Hereford
Measured: 59 kt (68 mph) measured gust
Reported by: Trained Spotter
Coordinates: 40.970, -104.300

Tornado, Elbert

When: June 11, 4:27 PM MST
Where: Elbert County, 3.85 mi SE of Matheson
Rating: EF0
Path length: 0.1 mi
Path width: 50 yd
Reported by: Trained Spotter
Coordinates: 39.130, -103.930

A tornado touched down but no damage.

Hail, Morgan

When: June 11, 4:30 PM MST
Where: Morgan County, 3.45 mi N of Hoyt
Measured: 3 in hail
Reported by: Trained Spotter
Coordinates: 40.070, -104.070

Hail, Morgan

When: June 11, 4:47 PM MST
Where: Morgan County, 8 mi S of Wiggins
Measured: 2.75 in hail
Reported by: County Official
Coordinates: 40.114, -104.070

Hail, Elbert

When: June 11, 4:55 PM MST
Where: Elbert County, 3.49 mi NE of River Bend
Measured: 1.25 in hail
Reported by: Trained Spotter
Coordinates: 39.320, -103.760

Hail, Arapahoe

When: June 11, 4:59 PM MST
Where: Arapahoe County, 4.78 mi W of Byers
Measured: 2 in hail
Reported by: Trained Spotter
Coordinates: 39.720, -104.310

Hail, Elbert

When: June 11, 5:00 PM MST
Where: Elbert County, 4.65 mi SW of Resolis
Measured: 2.75 in hail
Reported by: Public
Coordinates: 39.230, -103.900

Flash Flood, Weld

When: June 11, 5:00 PM MST to 10:00 PM MST
Where: Weld County, 3.49 mi E of Tonville to 1.83 mi E of Prospect
Cause: Heavy Rain
Property damage: $25,000
Crop damage: $250,000
Reported by: Storm Chaser
Coordinates: 40.016, -104.614

Heavy rain and torrential hail produced flash flooding over southeast Weld County. Fifty thousand acres of cropland was heavily damaged. Ham radio spotters reported water running across State Highway 52, east of Prospect Valley, forcing its closure. In addition, State Highways 14 and 392 near Briggdale were also inundated with water. Several county roads were either flooded or completely washed out.

Hail, Adams

When: June 11, 5:01 PM MST
Where: Adams County, 0.69 mi S of Bennett
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 39.740, -104.430

Hail, Douglas

When: June 11, 5:03 PM MST
Where: Douglas County, 6 mi E of Greenland
Measured: 2 in hail
Reported by: Trained Spotter
Coordinates: 39.150, -104.718

Hail, Douglas

When: June 11, 5:12 PM MST
Where: Douglas County, 8.5 mi SW of Castle Rock
Measured: 2 in hail
Reported by: Trained Spotter
Coordinates: 39.283, -104.983

Hail, Weld

When: June 11, 5:17 PM MST
Where: Weld County, 3.49 mi N of New Raymer Arpt
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 40.550, -103.880

Thunderstorm Wind, Weld

When: June 11, 5:17 PM MST
Where: Weld County, 3.35 mi NW of New Raymer Arpt
Measured: 52 kt (60 mph) measured gust
Reported by: Trained Spotter
Coordinates: 40.530, -103.920

Hail, Adams

When: June 11, 5:20 PM MST
Where: Adams County, 2.07 mi N of Strasburg
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.750, -104.300

Flash Flood, Weld

When: June 11, 5:45 PM MST to 10:30 PM MST
Where: Weld County, 2.66 mi W of Hereford to 13.55 mi SSW of Alden
Cause: Heavy Rain
Property damage: $25,000
Crop damage: $50,000
Reported by: Law Enforcement
Coordinates: 40.968, -104.351

Heavy rain either flooded or washed out several county roads including 51 and 82.

Flash Flood, Lincoln

When: June 11, 6:00 PM MST to 8:00 PM MST
Where: Lincoln County, 3.85 mi NE of (Lic)limon Arpt to 3.35 mi NNW of Limon
Cause: Heavy Rain
Property damage: $10,000
Reported by: Law Enforcement
Coordinates: 39.314, -103.593

Heavy rain caused flash flooding over parts of County Road 3J, forcing its closure.

Flash Flood, Elbert

When: June 11, 6:00 PM MST to 8:00 PM MST
Where: Elbert County, 5.43 mi ENE of River Bend to 4.85 mi N of River Bend
Cause: Heavy Rain
Property damage: $30,000
Reported by: Storm Chaser
Coordinates: 39.309, -103.705

Heavy rain caused flash flooding along Interstate 70 at the River Bend Exit. Several cars were reportedly stuck in the floodwaters.

Tornado, Lincoln

When: June 11, 6:10 PM MST
Where: Lincoln County, 6.72 mi ENE of Genoa
Rating: EF0
Path length: 0.1 mi
Path width: 50 yd
Reported by: Trained Spotter
Coordinates: 39.330, -103.392

A small tornado touched down briefly but did no damage.

Hail, Morgan

When: June 11, 6:15 PM MST
Where: Morgan County, 4.84 mi S of Wiggins
Measured: 2.75 in hail
Reported by: County Official
Coordinates: 40.160, -104.070

Thunderstorm Wind, Morgan

When: June 11, 6:15 PM MST
Where: Morgan County, 4.84 mi S of Wiggins
Measured: 52 kt (60 mph) measured gust
Reported by: County Official
Coordinates: 40.160, -104.070

Hail, Lincoln

When: June 11, 6:25 PM MST
Where: Lincoln County, 5.29 mi NNW of Arriba
Measured: 1.75 in hail
Reported by: Storm Chaser
Coordinates: 39.350, -103.310

Hail, Logan

When: June 11, 6:26 PM MST
Where: Logan County, 1.25 mi WSW of Peetz
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 40.960, -103.120

Hail, Logan

When: June 11, 6:26 PM MST
Where: Logan County, 1.25 mi WSW of Peetz
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 40.960, -103.120

Hail, Lincoln

When: June 11, 6:33 PM MST
Where: Lincoln County, 6.22 mi N of Arriba
Measured: 3 in hail
Reported by: Storm Chaser
Coordinates: 39.370, -103.270

Flash Flood, Morgan

When: June 11, 6:55 PM MST to 10:30 PM MST
Where: Morgan County, 1.5 mi NNW of Ft Morgan to 1.47 mi W of Ft Morgan
Cause: Heavy Rain
Property damage: $25,000
Crop damage: $50,000
Reported by: Emergency Manager
Coordinates: 40.270, -103.811

Heavy rain triggered flash flooding in the Fort Morgan and Brush areas. Numerous streets were closed due to the high floodwaters. Flooding was also reported on County Road T, near State Highway 52. A trained spotter in Fort Morgan measured 3 inches of rainfall.

Thunderstorm Wind, Logan

When: June 11, 6:59 PM MST
Where: Logan County, 5.27 mi NNW of Willard
Measured: 52 kt (60 mph) measured gust
Reported by: Trained Spotter
Coordinates: 40.620, -103.520

Hail, Phillips

When: June 11, 8:18 PM MST
Where: Phillips County, 2.1 mi E of Amherst
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 40.680, -102.130

The severe thunderstorm also produced a wind gusts to 60 mph. Heavy rain was also observed, estimated between 3 and 4 inches.

Thunderstorm Wind, Phillips

When: June 11, 8:45 PM MST
Where: Phillips County, 2.1 mi E of Amherst
Measured: 61 kt (70 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 40.680, -102.130

Damaging thunderstorm winds snapped 6 telephone poles off at the base. The poles were approximately 12 to 14 inches in diameter. In addition, the storm produced a measured 2.5 inches of rainfall.

Flash Flood, Phillips

When: June 11, 8:45 PM MST to 11:00 PM MST
Where: Phillips County, 6.68 mi NE of Amherst to 4.43 mi ESE of Amherst
Cause: Heavy Rain
Property damage: $25,000
Crop damage: $50,000
Reported by: County Official
Coordinates: 40.740, -102.070

Heavy rain washed out sections of 20 country roads in Phillips County.

Hail, Park

When: June 11, 9:45 PM MST
Where: Park County, 4.83 mi E of Hartsel
Measured: 1 in hail
Reported by: Law Enforcement
Coordinates: 39.020, -105.710

Hail, Douglas

When: June 11, 11:23 PM MST
Where: Douglas County, Westcreek
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.150, -105.170

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Colorado in 2010 Every state in 2010 This day in weather history The tornado archive for Colorado, 2010 Warnings in Colorado, June 2010

Sources

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: 232786, 232787, 232777, 232745, 232746, 232747, 232768, 232755, 232749, 232751, 232750, 232752, 232774, 232753, 232767, 232754, 232757, 240591, 232784, 232756, 232763, 232762, 232761, 232760, 240999, 232759, 234170, 232758, 232766, 232788, 232765, 241058, 241388, 241389, 232785, 232776, 232790, 232773, 232770, 232771, and more.