Alert archive / Colorado / Special Weather Statements in 2012

Special Weather Statement, NWS Denver/Boulder, CO

September 3, 2012Boulder County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Sep 3, 2012, 12:48 PM MDT for Boulder County, Colorado. It was in force for 42 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: Sep 3, 2012, 12:48 PM MDT (18:48 UTC)
Expired: Sep 3, 2012, 1:30 PM MDT
In force: 42 min
Issued by: NWS Denver/Boulder, CO

County Boulder County, CO

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.8 hours before the alert went out and 394 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2600 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 26 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 Sep 3, 11:11 AM MDT, 1 hour 37 minutes earlier.

Area forecast discussion, Sep 3, 11:11 AM MDT, 1 hour 37 minutes before

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Hazardous weather outlook, Sep 3, 11:22 AM MDT, 1 hour 26 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1122 AM MDT MON SEP 3 2012

COZ030>051-041730-
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-
1122 AM MDT MON SEP 3 2012

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS CHANCE OF THUNDERSTORMS IN THE HIGH COUNTRY OF NORTH
CENTRAL COLORADO THIS AFTERNOON...WITH THE POSSIBLY OF SMALL
HAIL...WIND GUSTS TO 45 MPH AND FREQUENT CLOUD-TO-GROUND
LIGHTNING. A POTENT LITTLE THUNDERSTORM NEAR KREMMLING IN GRAND
COUNTY HAS ALREADY PRODUCED SMALL HAIL AND STRONG GUSTY WINDS AS
OF 11 AM THIS MORNING. A FEW OF THESE HIGH COUNTRY STORMS MAY
MOVE EAST OVER THE ADJACENT HIGH PLAINS THIS AFTERNOON THERE THEY
MAY PRODUCE STRONG GUSTY WINDS...DANGEROUS LIGHTNING AND BRIEF
LIGHT TO MODERATE RAINFALL. MOST OF THIS STORM ACTIVITY SHOULD
MOVE EAST OF THE OUTLOOK AREA EARLY THIS EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

DRY WEATHER IS EXPECTED ACROSS THE FORECAST AREA TUESDAY INTO
THURSDAY MORNING.  A COLD FRONT WILL BRING A SLIGHT CHANCE OF LATE DAY
SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS THURSDAY AND
FRIDAY...WITH A SLIGHT CHANCE OF SHOWERS OVER THE PLAINS ON FRIDAY.
SATURDAY AND SUNDAY LOOK DRY AGAIN FOR ALL AREAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

In the hours before

Special weather statement, Sep 3, 10:46 AM MDT, 2 hours 2 minutes before

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Special weather statement, Sep 3, 12:48 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1248 PM MDT MON SEP 3 2012

COZ035-038-039-043-031930-
CENTRAL AND SOUTH WELD COUNTY CO-
BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD
COUNTY CO-LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY CO-
LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET CO-
1248 PM MDT MON SEP 3 2012

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

  SOUTH CENTRAL LARIMER COUNTY
  NORTHEASTERN BOULDER COUNTY
  SOUTHWESTERN WELD COUNTY

AT 1248 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM CAPABLE OF PRODUCING PEA SIZE HAIL...AND WIND GUSTS TO
AROUND 50 MPH.  THIS STORM WAS LOCATED NEAR LYONS...OR 26 MILES
SOUTHWEST OF FORT COLLINS...MOVING EAST AT 25 MPH.

LOCATIONS IN THE ADVISORY INCLUDE BUT ARE NOT LIMITED TO NIWOT...
MEAD...LYONS...JAMESTOWN...FREDERICK...FIRESTONE...DACONO...
BERTHOUD...LONGMONT AND NORTHEASTERN BOULDER.

LAT...LON 4035 10492 4004 10493 4010 10543 4033 10538
TIME...MOT...LOC 1848Z 275DEG 21KT 4022 10528

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 10:46 AM MDT	Special Weather Statement	BOU	Grand	59 min
Sep 3, 1:45 PM MDT	Special Weather Statement	BOU	Weld	45 min
Sep 3, 3:28 PM MDT	Special Weather Statement	BOU	Grand	47 min
Sep 3, 4:58 PM MDT	Special Weather Statement	BOU	Boulder	32 min
Sep 3, 5:42 PM MDT	Special Weather Statement	BOU	Broomfield, Denver, Weld	63 min

Nearby

Special Weather Statements in Colorado, 2012 Every special weather statement in 2012

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.