Alert archive / Colorado / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 78, NWS Denver/Boulder, CO

June 11, 2010Adams County, Arapahoe County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 11, 2010, 6:59 PM MDT for Adams County, Arapahoe County, Washington County, Colorado. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 11, 2010, 6:59 PM MDT (00:59 UTC)
Expired
Jun 11, 2010, 7:37 PM MDT
In force
38 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.5 in
Wind
50.0 mph

Counties Adams County, CO, Arapahoe County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 50 km from the middle of the area, began a volume at 00:59 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 11, 2:13 PM MDTTornado WatchSPC7 hr

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Jun 11, 3:10 PM MDT, 3 hours 49 minutes earlier.

Area forecast discussion, Jun 11, 3:10 PM MDT, 3 hours 49 minutes before
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Hazardous weather outlook, Jun 11, 11:00 AM MDT, 7 hours 59 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1100 AM MDT FRI JUN 11 2010

COZ030>051-121200-
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-
1100 AM MDT FRI JUN 11 2010

...FLOOD WATCH FOR PORTIONS OF LARIMER...WELD...AND BOULDER COUNTIES
TONIGHT THROUGH SATURDAY NIGHT...

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

.DAY ONE...TODAY AND TONIGHT

A VERY MOIST AIRMASS COUPLED WITH A DEEPENING UPPER LEVEL LOW OVER
THE SOUTHWEST WILL BRING WIDESPREAD THUNDERSTORMS AND SOME HEAVY
RAINS TO THE AREA THROUGH TONIGHT.  UPSLOPE FLOW IS DEEPENING OVER
THE AREA AND SHOWERS AND THUNDERSTORMS WILL SOON BE DEVELOPING IN
THE FOOTHILLS.  THESE WILL INCREASE IN COVERAGE LATER THIS AFTERNOON
AND TONIGHT WITH THE FOCUS FOR THE HEAVIEST RAINS IN AND NEAR THE
FOOTHILLS FROM WEST OF DENVER NORTH TO THE WYOMING BORDER.  GENERAL
RAINFALL TOTALS OF ONE TO TWO INCHES ARE POSSIBLE...WITH LOCALLY
MORE...ESPECIALLY IN LARIMER COUNTY.  A FLOOD WATCH REMAINS IN
EFFECT FOR MUCH OF THIS AREA THROUGH SATURDAY NIGHT.

AS THE PRECIPITATION BECOMES MORE WIDESPREAD TONIGHT THE SNOW LEVEL
WILL LOWER FROM AROUND 10000 FEET TO AROUND 9000 FEET BY SATURDAY
MORNING.  SEVERAL INCHES OF SNOW ARE LIKELY AT HIGHER ELEVATIONS
WHICH COULD CLOSE SEASONAL ROADS SUCH AS TRAIL RIDGE ROAD IN ROCKY
MOUNTAIN NATIONAL PARK.

ON THE PLAINS THE ATMOSPHERE IS NOT AS UNSTABLE AS YESTERDAY BUT
WITH ALL THE MOISTURE IN PLACE AND AFTERNOON HEATING SOME
THUNDERSTORMS COULD BECOME SEVERE.  AT THIS TIME LARGE HAIL APPEARS
TO BE THE MAIN THREAT WITH STRONG STORMS PERSISTING INTO THIS
EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A COOL AND WET WEATHER PATTERN WILL REMAIN OVER NORTH CENTRAL AND
NORTHEAST COLORADO THROUGH THE WEEKEND. PERIODS OF RAIN ARE EXPECTED
THROUGH SUNDAY AFTERNOON WITH SNOW ABOVE 10000 FEET AND POSSIBLY
MIXED DOWN TO 9000 FEET. SNOW ACCUMULATIONS OF 3 TO 6 INCHES ARE
POSSIBLE ABOVE 10000 FEET...MAINLY EAST OF THE CONTINENTAL DIVIDE.
MODERATE TO HEAVY RAIN MAY CAUSE STREAMS AND RIVERS TO RISE THE
WEEKEND ALONG THE FRONT RANGE...POSSIBLY FLOODING LOW LYING AREAS.

FOR NEXT WEEK THERE WILL BE A SLIGHT CHANCE FOR AFTERNOON AND
EVENING SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AFTER 1 PM.

SZOKE/MEIER

In the hours before

Local storm report, Jun 11, 5:18 PM MDT, 1 hour 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
518 PM MDT FRI JUN 11 2010

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

0503 PM     TORNADO          3 W RAMAH               39.12N 104.22W
06/11/2010                   EL PASO            CO   NWS EMPLOYEE

&&

BLOUIS
Local storm report, Jun 11, 5:23 PM MDT, 1 hour 36 minutes before
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Local storm report, Jun 11, 5:50 PM MDT, 1 hour 9 minutes before
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Local storm report, Jun 11, 5:52 PM MDT, 1 hour 7 minutes before
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Local storm report, Jun 11, 6:36 PM MDT, 23 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
636 PM MDT FRI JUN 11 2010

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

0626 PM     HAIL             4 E PERRY PARK          39.26N 104.91W
06/11/2010  M2.00 INCH       DOUGLAS            CO   TRAINED SPOTTER

0601 PM     HAIL             1 SSW BENNETT           39.74N 104.43W
06/11/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0600 PM     HAIL             6 NE MATHESON           39.23N 103.90W
06/11/2010  M2.75 INCH       ELBERT             CO   PUBLIC

0559 PM     HAIL             1 SW STRASBURG          39.72N 104.31W
06/11/2010  M2.00 INCH       ARAPAHOE           CO   TRAINED SPOTTER

0555 PM     HAIL             5 NW LIMON              39.32N 103.76W
06/11/2010  M1.25 INCH       ELBERT             CO   TRAINED SPOTTER

0555 PM     HAIL             5 NW LIMON              39.32N 103.76W
06/11/2010  E1.25 INCH       ELBERT             CO   TRAINED SPOTTER

0547 PM     HAIL             1 S WIGGINS             40.22N 104.07W
06/11/2010  M2.75 INCH       MORGAN             CO   COUNTY OFFICIAL

&&

BLOUIS
Local storm report, Jun 11, 6:54 PM MDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
654 PM MDT FRI JUN 11 2010

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

0620 PM     HAIL             1 N STRASBURG           39.75N 104.30W
06/11/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

            FUNNEL CLOUD 3 WEST STRASBURG 555 PM

&&

BLOUIS

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 11, 6:08 PM MDTTornado WarningBOUAdams, Arapahoe52 min
Jun 11, 6:11 PM MDTTornado WarningBOUMorgan, Washington34 min
Jun 11, 6:16 PM MDTSevere Thunderstorm WarningBOULogan, Weld59 min
Jun 11, 6:17 PM MDTFlash Flood WarningBOUElbert, Lincoln3 hr
Jun 11, 6:28 PM MDTTornado WarningBOUElbert, Lincoln47 min
Jun 11, 6:39 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld66 min
Jun 11, 6:43 PM MDTTornado WarningBOUMorgan, Washington32 min
Jun 11, 7:09 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington34 min
Jun 11, 7:12 PM MDTSevere Thunderstorm WarningBOULogan33 min
Jun 11, 7:13 PM MDTTornado WarningBOULincoln47 min
Jun 11, 7:35 PM MDTFlash Flood WarningBOULogan, Morgan, Washington4 hr
Jun 11, 7:42 PM MDTSevere Thunderstorm WarningBOULogan, Sedgwick63 min
Jun 11, 7:53 PM MDTSevere Thunderstorm WarningBOULincoln, Washington22 min
Jun 11, 8:27 PM MDTFlash Flood WarningBOUPhillips, Sedgwick2 hr
Jun 11, 8:32 PM MDTFlash Flood WarningBOUMorgan, Weld3 hr
Jun 11, 8:36 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick54 min
Jun 11, 9:59 PM MDTSevere Thunderstorm WarningBOUPark46 min
Jun 11, 10:30 PM MDTAreal Flood AdvisoryBOUPark90 min
Jun 11, 10:44 PM MDTSevere Thunderstorm WarningBOUPark61 min
Jun 11, 11:32 PM MDTAreal Flood WarningBOUMorgan, Weld10 hr
Jun 12, 12:17 AM MDTAreal Flood AdvisoryBOUDouglas, Jefferson, Park88 min
Jun 12, 4:20 AM MDTAreal Flood AdvisoryBOULarimer, Weld24 hr
Jun 12, 9:28 AM MDTAreal Flood WarningBOUWeld8 hr
Jun 12, 9:58 AM MDTAreal Flood AdvisoryBOUBoulder24 hr
Jun 12, 1:49 PM MDTRiver Flood AdvisoryBOULarimer6 hr
Jun 12, 1:49 PM MDTRiver Flood AdvisoryBOULarimer29 hr
Jun 12, 1:49 PM MDTRiver Flood AdvisoryBOUWeld29 hr
Jun 12, 1:49 PM MDTRiver Flood AdvisoryBOUWeld29 hr
Jun 12, 3:50 PM MDTAreal Flood WarningBOUWeld4 days
Jun 12, 5:15 PM MDTAreal Flood AdvisoryBOUWeld17 hr

Nearby

Severe Thunderstorm Warnings in Colorado, 2010Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.