Alert archive / Colorado / Special Weather Statements in 2017

Special Weather Statement, NWS Denver/Boulder, CO

July 3, 2017Adams County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Jul 3, 2017, 2:01 PM MDT for Adams County, Colorado. It was in force for 44 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 3, 2017, 2:01 PM MDT (20:01 UTC)
Expired: Jul 3, 2017, 2:45 PM MDT
In force: 44 min
Issued by: NWS Denver/Boulder, CO

County Adams County, CO

The radar

The Denver radar (KFTG), 19 km from the middle of the area, began a volume at 20:00 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, 8.0 hours before the alert went out and 124 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: 2719 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 3, 10:40 AM MDT, 3 hours 21 minutes earlier.

Area forecast discussion, Jul 3, 10:40 AM MDT, 3 hours 21 minutes before

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Hazardous weather outlook, Jul 3, 10:35 AM MDT, 3 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1035 AM MDT Mon Jul 3 2017

COZ030>051-041645-
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-
1035 AM MDT Mon Jul 3 2017

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

Isolated showers and thunderstorms will develop over the
mountains and adjacent plains by this afternoon before spreading
east on the plains through the early evening hours. Expect gusty
winds to 40 mph but only brief light rain for mountains and
speeds of up to 30 mph over the adjacent plains. Potential for a
few strong to severe storms increases over the far northeast
plains, generally east of a line from Akron to Sterling. Damaging
winds up to 60 mph and large hail are possible. Temperatures will
reach into the low 90s today with 50s to lower 60s expected
overnight.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Temperatures will be warming Tuesday through Thursday, with mid
90s expected across the Plains. Isolated to scattered
thunderstorms are possible over the mountains each afternoon,
while the Plains will have a slight chance of thunderstorms
Tuesday, then again Friday through Sunday. The main impacts from
any storms that form will be lightning and gusty winds to 40 mph.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed over the far northeast plains of
Colorado after 2 pm.

In the hours before

Special weather statement, Jul 3, 1:32 PM MDT, 29 minutes before

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Special weather statement, Jul 3, 2:01 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 2, 6:09 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Sedgwick	20 min
Jul 3, 1:32 PM MDT	Special Weather Statement	BOU	Weld	43 min
Jul 3, 2:30 PM MDT	Special Weather Statement	BOU	Adams	45 min
Jul 3, 2:37 PM MDT	Special Weather Statement	BOU	Lincoln	38 min
Jul 3, 3:08 PM MDT	Special Weather Statement	BOU	Morgan	37 min
Jul 3, 3:31 PM MDT	Special Weather Statement	BOU	Adams	44 min
Jul 3, 3:44 PM MDT	Special Weather Statement	BOU	Arapahoe	46 min
Jul 3, 4:20 PM MDT	Special Weather Statement	BOU	Elbert	25 min
Jul 3, 4:30 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Sedgwick, Washington	45 min
Jul 3, 4:45 PM MDT	Special Weather Statement	BOU	Lincoln	15 min

Nearby

Special Weather Statements in Colorado, 2017 Every special weather statement in 2017

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.