Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 151, NWS Norman, OK

May 5, 1998Lincoln County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 5, 1998, 2:21 AM CDT for Lincoln County, Oklahoma. It was in force for 54 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 5, 1998, 2:21 AM CDT (07:21 UTC)
Expired: May 5, 1998, 3:15 AM CDT
In force: 54 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Lincoln County, OK

The radar

The Norman radar (KTLX), 55 km from the middle of the area, began a volume at 07:23 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 5, 2:30 AM CDT	Thunderstorm Wind	Meeker, OK

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 5, 1:45 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.4 hours before the alert went out and 71 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: 7 J/kg
Mixed-layer CIN: -421 J/kg
Mixed-layer LCL: 2029 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 4, 9:30 PM CDT, 4 hours 51 minutes earlier.

Area forecast discussion, May 4, 9:30 PM CDT, 4 hours 51 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 5, 1:16 AM CDT	Severe Thunderstorm Warning	OUN	Blaine	44 min
May 5, 1:29 AM CDT	Severe Thunderstorm Warning	OUN	Major, Woodward	46 min
May 5, 1:34 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	41 min
May 5, 1:44 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Logan, Oklahoma	46 min
May 5, 2:07 AM CDT	Severe Thunderstorm Warning	OUN	Harper	38 min
May 5, 2:14 AM CDT	Severe Thunderstorm Warning	OUN	Major	61 min
May 5, 2:18 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	57 min
May 5, 3:04 AM CDT	Severe Thunderstorm Warning	OUN	Woods	56 min
May 5, 3:13 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	47 min
May 5, 3:22 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	38 min
May 5, 3:40 AM CDT	Flash Flood Warning	OUN	Logan	3 hr
May 5, 3:58 AM CDT	Severe Thunderstorm Warning	OUN	Logan	47 min
May 5, 5:54 AM CDT	Severe Thunderstorm Warning	OUN	Hughes	51 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998 Every severe thunderstorm warning in 1998

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.