Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 79, NWS Norman, OK

March 30, 1998Johnston County, Marshall County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 30, 1998, 4:57 PM CST for Johnston County, Marshall County, Oklahoma. It was in force for 48 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
Mar 30, 1998, 4:57 PM CST (22:57 UTC)
Expired
Mar 30, 1998, 5:45 PM CST
In force
48 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Johnston County, OK, Marshall County, OK

The radar

The Norman radar (KTLX), 139 km from the middle of the area, began a volume at 22:58 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

TimeReportWhereRemark
Mar 30, 5:30 PM CSTHail 0.75Coleman, 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.

IssuedProductOfficeLasted
Mar 30, 1:00 PM CSTTornado WatchSPC7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.0 hours before the alert went out and 132 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-pSkew-T log-p diagram, Norman, OK at 12:00Z on 1998-03-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 769 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 1998-03-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 231 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
769 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
646 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
231 m²/s²
0-3 km storm-relative helicity
255 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 30, 1:16 AM CSTSevere Thunderstorm WarningOUNHarper, Woods44 min
Mar 30, 1:41 AM CSTSevere Thunderstorm WarningOUNEllis49 min
Mar 30, 2:17 AM CSTSevere Thunderstorm WarningOUNHarper, Woodward43 min
Mar 30, 3:22 AM CSTSevere Thunderstorm WarningOUNWoodward23 min
Mar 30, 12:20 PM CSTSevere Thunderstorm WarningOUNComanche, Grady40 min
Mar 30, 1:00 PM CSTSevere Thunderstorm WarningOUNCanadian, Grady45 min
Mar 30, 1:00 PM CSTSevere Thunderstorm WarningOUNCotton, Jefferson, Stephens45 min
Mar 30, 1:16 PM CSTSevere Thunderstorm WarningOUNCleveland, McClain44 min
Mar 30, 1:16 PM CSTSevere Thunderstorm WarningOUNKingfisher, Logan, Oklahoma44 min
Mar 30, 1:44 PM CSTSevere Thunderstorm WarningOUNGarvin, Grady, McClain, Stephens46 min
Mar 30, 1:44 PM CSTSevere Thunderstorm WarningOUNJefferson46 min
Mar 30, 2:29 PM CSTSevere Thunderstorm WarningOUNCarter, Garvin, Jefferson, Stephens46 min
Mar 30, 2:29 PM CSTSevere Thunderstorm WarningOUNCleveland, McClain46 min
Mar 30, 2:35 PM CSTSevere Thunderstorm WarningOUNKay40 min
Mar 30, 3:00 PM CSTSevere Thunderstorm WarningOUNPottawatomie45 min
Mar 30, 3:14 PM CSTSevere Thunderstorm WarningOUNCarter, Garvin, McClain, Murray46 min
Mar 30, 3:14 PM CSTSevere Thunderstorm WarningOUNLove46 min
Mar 30, 3:42 PM CSTSevere Thunderstorm WarningOUNPottawatomie63 min
Mar 30, 3:58 PM CSTSevere Thunderstorm WarningOUNCarter, Johnston, Murray, Pontotoc62 min
Mar 30, 3:58 PM CSTSevere Thunderstorm WarningOUNLove, Marshall62 min
Mar 30, 4:46 PM CSTSevere Thunderstorm WarningOUNCoal, Hughes59 min
Mar 30, 5:36 PM CSTSevere Thunderstorm WarningOUNAtoka54 min
Mar 30, 5:46 PM CSTSevere Thunderstorm WarningOUNCoal29 min
Mar 30, 5:47 PM CSTSevere Thunderstorm WarningOUNBryan43 min
Mar 30, 5:59 PM CSTSevere Thunderstorm WarningOUNAtoka31 min
Mar 30, 12:44 PM CSTSevere Thunderstorm WarningOUNArcher, Clay, Wichita31 min
Mar 30, 1:12 PM CSTSevere Thunderstorm WarningOUNArcher, Clay48 min
Mar 30, 1:58 PM CSTSevere Thunderstorm WarningOUNClay47 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998Every 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.