Alert archive / Colorado / Special Weather Statements in 2014

Special Weather Statement, NWS Denver/Boulder, CO

August 23, 2014Adams County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Aug 23, 2014, 3:29 PM MDT for Adams County, Colorado. It was in force for 31 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: Aug 23, 2014, 3:29 PM MDT (21:29 UTC)
Expired: Aug 23, 2014, 4:00 PM MDT
In force: 31 min
Issued by: NWS Denver/Boulder, CO

County Adams County, CO

The radar

The Denver radar (KFTG), 31 km from the middle of the area, began a volume at 21:32 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, 9.5 hours before the alert went out and 100 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: 70 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1113 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 25 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 Aug 23, 3:29 PM MDT, 0 minutes earlier.

Area forecast discussion, Aug 23, 3:29 PM MDT, 0 minutes before

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Hazardous weather outlook, Aug 23, 10:33 AM MDT, 4 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1033 AM MDT SAT AUG 23 2014

COZ030>051-241645-
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-
1033 AM MDT SAT AUG 23 2014

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

.DAY ONE...TODAY AND TONIGHT

THERE WILL BE A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS IN THE
MOUNTAINS WITH A CHANCE OF THUNDERSTORMS OVER NORTHEAST COLORADO
THIS AFTERNOON INTO THE EVENING HOURS. THE STORMS WILL PRODUCE BRIEF
HEAVY RAIN AND GUSTY WINDS. OVER FAR NORTHEAST COLORADO AN
ISOLATED SEVERE THUNDERSTORM IS POSSIBLE WITH WIND GUSTS TO 60 MPH
AND HAIL TO ONE INCH IN DIAMETER.

THE THREAT OF SHOWERS AND THUNDERSTORMS WILL GRADUALLY DECREASE
THIS EVENING AS DRIER AIR SPREADS ACROSS THE AREA.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

IT WILL REMAIN UNSETTLED SUNDAY THROUGH WEDNESDAY. ON SUNDAY IT
WILL BE RELATIVELY COOL WITH A CHANCE OF THUNDERSTORMS IN THE
MOUNTAINS SUNDAY AFTERNOON AND EVENING...WITH A LESSER CHANCE
ACROSS THE NORTHEAST PLAINS. IT WILL BE A LITTLE DRIER ON MONDAY
WITH TEMPERATURES STILL HOVERING NEAR 80. THE NEXT STORM SYSTEM
WILL BRING COOLER TEMPERATURES AND A BETTER CHANCE OF SHOWERS AND
THUNDERSTORMS TO THE REGION LATE MONDAY NIGHT THROUGH TUESDAY
NIGHT. IT WILL REMAIN COOL ON WEDNESDAY WITH A LESSER CHANCE OF
THUNDERSTORMS. A RIDGE BUILDING OVER THE WEST WILL BRING DRIER AND
WARMER WEATHER BACK INTO THE AREA FOR THURSDAY AND FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

In the hours before

Special weather statement, Aug 23, 2:21 PM MDT, 1 hour 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
221 PM MDT SAT AUG 23 2014

COZ039-040-043-232100-
CENTRAL AND SOUTH WELD COUNTY CO-
BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY
CO-
NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE
COUNTIES/EAST BROOMFIELD COUNTY CO-
221 PM MDT SAT AUG 23 2014

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BOULDER...
SOUTHWESTERN WELD...BROOMFIELD...NORTHERN JEFFERSON...NORTHWESTERN
DENVER AND NORTHWESTERN ADAMS COUNTIES UNTIL 300 PM MDT...

AT 220 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
ERIE...OR 21 MILES NORTH OF DENVER...MOVING EAST AT 20 MPH.

HALF INCH HAIL AND RAINFALL AMOUNTS UP TO AN INCH IN 30 MINUTES
WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
NORTHERN THORNTON...NORTHERN WESTMINSTER...NORTHEASTERN BOULDER...
BROOMFIELD...BRIGHTON...LAFAYETTE...LOUISVILLE...ERIE...FIRESTONE...
FREDERICK...FORT LUPTON...LOCHBUIE...DACONO...PLATTEVILLE AND NIWOT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXPECT SOME STREET FLOODING WITH THIS STORM.

&&

LAT...LON 3990 10514 4008 10522 4025 10475 3999 10463
TIME...MOT...LOC 2020Z 250DEG 18KT 4002 10508

Local storm report, Aug 23, 2:44 PM MDT, 45 minutes before

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Special weather statement, Aug 23, 2:46 PM MDT, 43 minutes before

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Special weather statement, Aug 23, 3:29 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
Aug 22, 6:50 PM MDT	Special Weather Statement	BOU	Washington	40 min
Aug 22, 7:15 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Elbert, Lincoln, Morgan, Washington	90 min
Aug 23, 2:21 PM MDT	Special Weather Statement	BOU	Broomfield	39 min
Aug 23, 2:24 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	36 min
Aug 23, 2:46 PM MDT	Special Weather Statement	BOU	Adams	44 min

Nearby

Special Weather Statements in Colorado, 2014 Every special weather statement in 2014

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.