Alert archive / Nebraska / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 28, NWS North Platte, NE

May 14, 1999Frontier County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 14, 1999, 7:12 PM CDT for Frontier County, Nebraska. It was in force for 63 min. 1 report 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: May 14, 1999, 7:12 PM CDT (00:12 UTC)
Expired: May 14, 1999, 8:15 PM CDT
In force: 63 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Frontier County, NE

The radar

The North Platte radar (KLNX), 160 km from the middle of the area, began a volume at 00:14 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.

What was reported inside it

Time	Report	Where	Remark
May 14, 7:30 PM CDT	Hail 1	Maywood, NE

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
May 14, 4:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.2 hours before the alert went out and 69 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: 87 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1070 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 198 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 North Platte, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at May 14, 2:25 PM CDT, 4 hours 47 minutes earlier.

Area forecast discussion, May 14, 2:25 PM CDT, 4 hours 47 minutes before

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In the hours before

Local storm report, May 14, 5:51 PM CDT, 1 hour 21 minutes before

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Local storm report, May 14, 5:51 PM CDT, 1 hour 21 minutes before

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Local storm report, May 14, 6:41 PM CDT, 31 minutes before

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Local storm report, May 14, 6:41 PM CDT, 31 minutes before

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The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 14, 7:50 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	35 min
May 14, 8:22 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	33 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 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; radar from the NEXRAD Level II archive.