Alert archive / Colorado / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 142, NWS Denver/Boulder, CO

August 9, 2010Larimer County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 9, 2010, 2:28 PM MDT for Larimer County, Colorado. It was in force for 22 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: Aug 9, 2010, 2:28 PM MDT (20:28 UTC)
Expired: Aug 9, 2010, 2:50 PM MDT
In force: 22 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Larimer County, CO

The radar

The Cheyenne radar (KCYS), 77 km from the middle of the area, began a volume at 20:30 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.

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 Aug 9, 3:06 AM MDT, 11 hours 22 minutes earlier.

Area forecast discussion, Aug 9, 3:06 AM MDT, 11 hours 22 minutes before

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Hazardous weather outlook, Aug 9, 11:07 AM MDT, 3 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK...DELAYED
NATIONAL WEATHER SERVICE DENVER CO
1107 AM MDT MON AUG 09 2010

COZ030>051-101200-
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-
1107 AM MDT MON AUG 09 2010

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

.DAY ONE...TODAY AND TONIGHT

LIGHT RAIN SHOWERS FROM THIS MORNING HAVE MOVED OUT OF THE REGION
LEAVING BEHIND MOSTLY SUNNY SKIES.  HOWEVER...AN UPPER LEVEL WEATHER
DISTURBANCE REMAINS OVER THE CENTRAL PART OF THE STATE WHICH WILL
PRODUCE ADDITIONAL SHOWERS AND THUNDERSTORMS LATER THIS AFTERNOON.
STRONG DAYTIME HEATING AND A STILL MOIST AIRMASS WILL COMBINE WITH
THE UPPER LEVEL DISTURBANCE TO PRODUCE THE SHOWER ACTIVITY.
THUNDERSTORMS WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL
WITH RATES UP TO AN INCH AND A HALF IN 30 MINUTES.  STORM MOTIONS
OUT OF THE SOUTH TO SOUTHWEST WILL ALSO MAKE IT POSSIBLE FOR
MULTIPLE ROUNDS OF STORM DEVELOPMENT THROUGH THE EVENING HOURS.
THE PASSAGE OF MORE THAN A SINGLE STORM WILL BE POSSIBLE AT ANY
GIVEN LOCATION.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

DRIER AND WARMER CONDITIONS ARE EXPECTED FOR LATER THIS WEEK WITH
THE EASTWARD SHIFT OF THE MONSOONAL MOISTURE PLUME. HOWEVER STRONG
DAYTIME HEATING MAY STILL MANAGE TO PRODUCE ISOLATED TO EVEN
SCATTERED THUNDERSTORMS EACH AFTERNOON AND EVENING...MAINLY OVER AND
NEAR THE HIGH MOUNTAIN TERRAIN.  ANTICIPATE ABOVE AVERAGE
TEMPERATURES THROUGH FRIDAY WITH A RETURN TO MORE SEASONAL
TEMPERATURES BY THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.
HOWEVER...REPORTS OF HEAVY RAINFALL WILL BE APPRECIATED.

DANKERS/BAKER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 11:32 PM MDT	Special Weather Statement	BOU	Lincoln	28 min
Aug 9, 12:03 AM MDT	Special Weather Statement	BOU	Lincoln	27 min
Aug 9, 1:21 AM MDT	Areal Flood Advisory	BOU	Lincoln	84 min
Aug 9, 2:18 PM MDT	Areal Flood Advisory	BOU	Larimer	87 min
Aug 9, 2:48 PM MDT	Areal Flood Advisory	BOU	Clear Creek, Gilpin	87 min
Aug 9, 3:10 PM MDT	Areal Flood Advisory	BOU	Douglas, Jefferson	95 min
Aug 9, 4:29 PM MDT	Severe Thunderstorm Warning	BOU	Weld	29 min
Aug 9, 4:50 PM MDT	Areal Flood Advisory	BOU	Weld	85 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2010 Every 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.