Alert archive / Colorado / Special Weather Statements in 2013

Special Weather Statement, NWS Denver/Boulder, CO

July 24, 2013Clear Creek County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Jul 24, 2013, 1:13 PM MDT for Clear Creek County, Colorado. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 24, 2013, 1:13 PM MDT (19:13 UTC)
Expired: Jul 24, 2013, 2:00 PM MDT
In force: 47 min
Issued by: NWS Denver/Boulder, CO

County Clear Creek County, CO

The radar

The Denver radar (KFTG), 92 km from the middle of the area, began a volume at 19:14 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 nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 7.2 hours before the alert went out and 202 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 429 J/kg
Mixed-layer CIN: -353 J/kg
Mixed-layer LCL: 1506 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 24, 9:53 AM MDT, 3 hours 20 minutes earlier.

Area forecast discussion, Jul 24, 9:53 AM MDT, 3 hours 20 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Jul 24, 10:51 AM MDT, 2 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1051 AM MDT WED JUL 24 2013

COZ030>051-251700-
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-
1051 AM MDT WED JUL 24 2013

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS DEVELOP OVER THE MOUNTAINS AND FOOTHILLS THIS
AFTERNOON AND SPREAD ONTO THE PLAINS THIS AFTERNOON AND EVENING.
AN ISOLATED SEVERE THUNDERSTORM WILL BE POSSIBLE OVER THE
OVER THE FRONT RANGE AND EASTERN PLAINS WITH HAIL TO ONE INCH IN
DIAMETER AND WIND GUSTS TO 60 MPH. OTHERWISE THE STORMS WILL
PRODUCE BRIEF HEAVY RAIN...SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

HIGH PRESSURE ALOFT OVER THE SOUTHWESTERN UNITED STATES WILL BE
WEAKENING THROUGH SUNDAY...ALLOWING SUBTROPICAL MOISTURE TO SPREAD
ACROSS COLORADO. INCREASED MOISTURE LEVELS WILL FUEL AFTERNOON
SHOWERS AND THUNDERSTORMS THAT DEVELOP OVER THE MOUNTAINS AND
MOVE EASTWARD ONTO THE PLAINS. THE STORMS COULD BE SLOW MOVING AT
TIMES...MAKING LOCALLY HEAVY RAIN POSSIBLE. THE UPPER RIDGE IS
EXPECTED TO STRENGTHEN LATE IN THE WEEKEND WHICH WILL DIMINISH THE
CHANCE OF AFTERNOON SHOWERS SLIGHTLY. TEMPERATURES WILL ALSO BE
SLIGHTLY COOLER THAN SEASONAL NORMALS UNTIL EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

In the hours before

Special weather statement, Jul 24, 1:13 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
113 PM MDT WED JUL 24 2013

COZ034-036-242000-
SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST
BOULDER/GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE
9000 FEET-JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE  6000
FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-
113 PM MDT WED JUL 24 2013

THE NATIONAL WEATHER SERVICE HAS ISSUED A SIGNIFICANT WEATHER
ADVISORY FOR NORTHEASTERN PARK COUNTY UNTIL 200 PM MDT.

AT 112 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM OVER HIGHLAND PARK...OR 35 MILES SOUTHWEST OF
DENVER...MOVING NORTHEAST AT 30 MPH.

HAIL UP TO THE SIZE OF NICKELS WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE BUT ARE NOT LIMITED TO...
SHAWNEE...BAILEY...HARRIS PARK...GRANT AND HIGHLAND PARK.

LAT...LON 3936 10550 3946 10570 3956 10566 3956 10540
      3941 10540
TIME...MOT...LOC 1912Z 218DEG 25KT 3950 10555

KRIEDERMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 7:56 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	34 min
Jul 24, 2:32 PM MDT	Special Weather Statement	BOU	Douglas	28 min
Jul 24, 2:46 PM MDT	Areal Flood Advisory	BOU	Douglas	119 min
Jul 24, 2:57 PM MDT	Special Weather Statement	BOU	Douglas	33 min
Jul 24, 5:13 PM MDT	Severe Thunderstorm Warning	BOU	Weld	32 min

Nearby

Special Weather Statements in Colorado, 2013 Every special weather statement in 2013

Sources

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