Alert archive / Colorado / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 57, NWS Denver/Boulder, CO

June 11, 1999Lincoln County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 11, 1999, 7:31 PM MDT for Lincoln County, Colorado. It was in force for 44 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 11, 1999, 7:31 PM MDT (01:31 UTC)
Expired: Jun 11, 1999, 8:15 PM MDT
In force: 44 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Lincoln County, CO

What was reported inside it

Time	Report	Where	Remark
Jun 11, 8:15 PM MDT	Hail 1	Karval, CO
Jun 11, 8:25 PM MDT	Hail 0.75	Karval, CO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 11, 1:15 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.5 hours before the alert went out and 101 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: 26 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1482 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: -68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 11, 2:15 PM MDT, 5 hours 16 minutes earlier.

Area forecast discussion, Jun 11, 2:15 PM MDT, 5 hours 16 minutes before

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In the hours before

Local storm report, Jun 11, 5:32 PM MDT, 1 hour 59 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 11, 8:07 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	38 min
Jun 12, 1:15 PM MDT	Severe Thunderstorm Warning	BOU	Jefferson, Park	30 min
Jun 12, 1:20 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	30 min
Jun 12, 1:44 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	46 min
Jun 12, 1:48 PM MDT	Severe Thunderstorm Warning	BOU	Douglas, Jefferson	42 min
Jun 12, 2:35 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas, Elbert	35 min
Jun 12, 2:57 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	33 min
Jun 12, 3:29 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	46 min
Jun 12, 3:29 PM MDT	Severe Thunderstorm Warning	BOU	Denver	46 min
Jun 12, 5:49 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	26 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.