Alert archive / Colorado / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 103, NWS Denver/Boulder, CO

July 2, 2010Adams County, Arapahoe County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 2, 2010, 1:51 PM MDT for Adams County, Arapahoe County, Washington County, Colorado. It was in force for 39 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
Jul 2, 2010, 1:51 PM MDT (19:51 UTC)
Expired
Jul 2, 2010, 2:30 PM MDT
In force
39 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 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 19:51 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 Jul 2, 2:51 AM MDT, 11 hours earlier.

Area forecast discussion, Jul 2, 2:51 AM MDT, 11 hours before
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Hazardous weather outlook, Jul 2, 11:23 AM MDT, 2 hours 28 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1123 AM MDT FRI JUL 02 2010

COZ030>051-031200-
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-
1123 AM MDT FRI JUL 02 2010

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

.DAY ONE...TODAY AND TONIGHT

SUBTROPICAL MOISTURE IN SOUTHWEST FLOW ALOFT WILL HELP TRIGGER
SCATTERED AFTERNOON THUNDERSTORMS IN THE MOUNTAINS AND FOOTHILLS
THIS AFTERNOON.  THE STORMS WILL THEN SPREAD ACROSS THE URBAN
CORRIDOR AND NORTHEAST PLAINS DURING THE MID AFTERNOON AND EVENING
HOURS.  THE STRONGER STORMS WILL PRODUCE FREQUENT CLOUD TO GROUND
LIGHTNING...GUSTY WINDS TO 45 MPH AND LOCALLY HEAVY RAINFALL...UP TO
A HALF INCH IN 30 MINUTES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED LATE DAY THUNDERSTORMS AND VERY WARM TEMPERATURES ON
SATURDAY GIVE WAY TO SCATTERED SHOWERS AND MUCH COOLER TEMPERATURES
ON SUNDAY. A STRONG COLD FRONT ASSOCIATED WITH A RATHER VIGOROUS
UPPER LEVEL LOW PRESSURE TROUGH IS FORECAST TO DROP SOUTH THROUGH
NORTHEAST COLORADO EARLY ON SUNDAY. DURING THE DAY COOL AND
RELATIVELY MOIST UPSLOPE FLOW BEHIND THE COLD FRONT SHOULD PRODUCE
QUITE A BIT OF CLOUDINESS AND HOLD AFTERNOON TEMPERATURES ON THE
PLAINS TO THE 70S. HIGH COUNTRY LOCATIONS...PARTICULARLY WEST OF THE
CONTINENTAL DIVIDE WILL NOT SEE AS MUCH COOLING WITH THIS SYSTEM.
TEMPERATURES REBOUND AND SHOWERS GO AWAY ON MONDAY AS A WEAK HIGH
PRESSURE RIDGE RACES ACROSS THE REGION. YET ANOTHER WEATHER
DISTURBANCE DROPS OUT OF THE NORTHERN ROCKIES ON TUESDAY BRINGING
WITH IT ANOTHER ROUND OF BELOW NORMAL TEMPERATURES AND SCATTERED
SHOWERS TO THE OUTLOOK AREA TUESDAY AND WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

COOPER/BAKER

In the hours before

Special weather statement, Jul 2, 1:00 PM MDT, 51 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
100 PM MDT FRI JUL 2 2010

COZ045-046-021930-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY CO-CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES CO-
100 PM MDT FRI JUL 2 2010

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY FOR

  NORTH CENTRAL ELBERT COUNTY
  EASTERN ARAPAHOE COUNTY

AT 100 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND WIND GUSTS TO
AROUND 40 MPH.  THIS STORM WAS LOCATED 3 MILES SOUTH OF DEER TRAIL...
OR 29 MILES NORTHWEST OF LIMON...MOVING NORTHEAST AT 20 MPH.

LOCATIONS IN THE ADVISORY INCLUDE BUT ARE NOT LIMITED TO DEER TRAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINS MAY ALSO OCCUR WITH THIS STORM...WHICH MAY FLOOD
LOW-LYING AREAS SUCH AS DITCHES AND UNDERPASSES. DO NOT DRIVE YOUR
VEHICLE ON A FLOODED ROADWAY.

&&

LAT...LON 3974 10410 3974 10382 3948 10397 3955 10418
TIME...MOT...LOC 1900Z 202DEG 16KT 3960 10403

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 1:00 PM MDTSpecial Weather StatementBOUArapahoe30 min
Jul 2, 3:23 PM MDTSevere Thunderstorm WarningBOUPhillips37 min
Jul 2, 3:59 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick31 min
Jul 2, 4:11 PM MDTAreal Flood AdvisoryBOUPhillips94 min
Jul 2, 4:25 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick21 min

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.