Alert archive / Colorado / Special Weather Statements in 2018

Special Weather Statement, NWS Denver/Boulder, CO

June 27, 2018Broomfield County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Jun 27, 2018, 6:10 PM MDT for Broomfield County, Colorado. It was in force for 50 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: Jun 27, 2018, 6:10 PM MDT (00:10 UTC)
Expired: Jun 27, 2018, 7:00 PM MDT
In force: 50 min
Issued by: NWS Denver/Boulder, CO

County Broomfield County, CO

The radar

The Denver radar (KFTG), 54 km from the middle of the area, began a volume at 00:10 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.2 hours before the alert went out and 404 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: 4603 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1383 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: -0.4
Supercell composite: -5.2

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 Jun 27, 4:35 PM MDT, 1 hour 35 minutes earlier.

Area forecast discussion, Jun 27, 4:35 PM MDT, 1 hour 35 minutes before

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Hazardous weather outlook, Jun 27, 11:03 AM MDT, 7 hours 7 minutes before

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In the hours before

Local storm report, Jun 27, 4:58 PM MDT, 1 hour 12 minutes before

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Special weather statement, Jun 27, 5:24 PM MDT, 46 minutes before

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Special weather statement, Jun 27, 6:01 PM MDT, 9 minutes before

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Special weather statement, Jun 27, 6:10 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
Jun 27, 6:01 PM MDT	Special Weather Statement	BOU	Broomfield	44 min
Jun 27, 7:01 PM MDT	Special Weather Statement	BOU	Arapahoe	29 min
Jun 28, 4:37 AM MDT	Fire Weather Watch	BOU	Grand, Jackson, Park, Summit	10 hr
Jun 28, 2:42 PM MDT	Red Flag Warning	BOU	Boulder, Clear Creek, Gilpin, Grand, Jackson, Larimer and 2 more	28 hr

Nearby

Special Weather Statements in Colorado, 2018 Every special weather statement in 2018

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.