Alert archive / Colorado / Special Weather Statements in 2011

Special Weather Statement, NWS Denver/Boulder, CO

July 17, 2011Gilpin County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Jul 17, 2011, 2:20 PM MDT for Gilpin County, Colorado. It was in force for 25 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 17, 2011, 2:20 PM MDT (20:20 UTC)
Expired: Jul 17, 2011, 2:45 PM MDT
In force: 25 min
Issued by: NWS Denver/Boulder, CO

County Gilpin County, CO

The radar

The Denver radar (KFTG), 87 km from the middle of the area, began a volume at 20:23 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 (KDNR), launched 12:00Z, 8.3 hours before the alert went out and 199 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: 94 J/kg
Mixed-layer CIN: -352 J/kg
Mixed-layer LCL: 1885 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 17, 4:00 AM MDT, 10 hours 20 minutes earlier.

Area forecast discussion, Jul 17, 4:00 AM MDT, 10 hours 20 minutes before

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Hazardous weather outlook, Jul 17, 10:49 AM MDT, 3 hours 31 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1049 AM MDT SUN JUL 17 2011

COZ030>051-181200-
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-
1049 AM MDT SUN JUL 17 2011

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL DEVELOP ACROSS THE MOUNTAINS...
FOOTHILLS AND THE URBAN CORRIDOR THIS AFTERNOON...POSSIBLY SPREADING
OVER THE PLAINS BY LATE AFTERNOON. THE STORMS WILL PRODUCE LIGHTNING
AND BRIEF HEAVY RAIN WITH RAINFALL RATES UP TO AN INCH PER HOUR
POSSIBLE. GUSTY SOUTHERLY WINDS OF 15 TO 25 MPH WILL OCCUR ACROSS
THE EASTERN PLAINS LATE THIS AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

LITTLE CHANGE IN THE WEATHER PATTERN IS EXPECTED.  THE BEST CHANCE
OF THUNDERSTORMS WILL BE OVER THE MOUNTAINS EACH DAY...WITH A SLIGHT
CHANCE OF THUNDERSTORMS OVER THE NORTHEAST PLAINS OF COLORADO.
TEMPERATURES WILL BE ABOVE SEASONAL NORMALS IN MOST AREAS...
ESPECIALLY OUT OF THE PLAINS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

D_L/RJK

In the hours before

Special weather statement, Jul 17, 2:20 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 6:33 PM MDT	River Flood Advisory	BOU	Morgan	40 hr
Jul 16, 6:33 PM MDT	River Flood Advisory	BOU	Logan, Morgan, Washington	63 hr
Jul 16, 9:37 PM MDT	Severe Thunderstorm Warning	BOU	Weld	35 min
Jul 17, 12:55 PM MDT	Areal Flood Advisory	BOU	Boulder, Grand, Larimer	80 min
Jul 17, 2:25 PM MDT	Severe Thunderstorm Warning	BOU	Gilpin	35 min
Jul 17, 2:29 PM MDT	Areal Flood Advisory	BOU	Clear Creek, Gilpin	91 min
Jul 17, 2:57 PM MDT	Flash Flood Warning	BOU	Clear Creek, Gilpin	3 hr
Jul 17, 3:33 PM MDT	Special Weather Statement	BOU	Boulder	27 min
Jul 17, 3:37 PM MDT	Areal Flood Advisory	BOU	Boulder	83 min
Jul 17, 3:44 PM MDT	Flash Flood Warning	BOU	Boulder	3 hr
Jul 17, 3:59 PM MDT	Special Weather Statement	BOU	Boulder	31 min
Jul 17, 4:16 PM MDT	Areal Flood Advisory	BOU	Boulder	89 min
Jul 17, 4:31 PM MDT	Special Weather Statement	BOU	Boulder	29 min
Jul 17, 4:57 PM MDT	Special Weather Statement	BOU	Boulder	33 min
Jul 17, 5:01 PM MDT	Areal Flood Advisory	BOU	Boulder	89 min
Jul 17, 5:25 PM MDT	Special Weather Statement	BOU	Boulder	35 min

Nearby

Special Weather Statements in Colorado, 2011 Every special weather statement in 2011

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.