Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 472, NWS Norman, OK

June 30, 2001Lincoln County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 30, 2001, 12:53 AM CDT for Lincoln County, Oklahoma. It was in force for 37 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 30, 2001, 12:53 AM CDT (05:53 UTC)
Expired: Jun 30, 2001, 1:30 AM CDT
In force: 37 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 05:53 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
Jun 30, 1:00 AM CDT	Hail 1	Prague, OK
Jun 30, 1:05 AM CDT	Hail 1.75	Prague, 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 5.9 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: 1853 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1446 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 7.9

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.

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 Jun 29, 9:45 PM CDT, 3 hours 8 minutes earlier.

Area forecast discussion, Jun 29, 9:45 PM CDT, 3 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
945 PM CDT FRI JUN 29 2001

00Z UA DATA SHOWS GOOD H8 WAA PATTERN ACRS SRN HALF OF THE FA. RUC
AND MESOETA SHOW WAA PATTERN CONTINUING OVERNIGHT...MAINLY ERN HALF
OF THE FA. PLENTY OF MOISTR ARND AND WITH WAA CONTG WILL CONT WITH
MAINLY CHC CAT POPS CNTRL AND E TONIGHT. WILL INCREASE CLDS AND
TWEAK A FEW MINS WITH HI DEWPOINTS AND INCRSG CLDS HOLDING UP TMPS.

02

.OUN...
OK...NONE.
TX...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 12:45 AM CDT	Severe Thunderstorm Warning	OUN	Seminole	45 min
Jun 30, 1:23 AM CDT	Severe Thunderstorm Warning	OUN	Payne	52 min
Jun 30, 1:27 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	48 min
Jun 30, 1:55 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	50 min
Jun 30, 2:13 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	62 min
Jun 30, 2:18 AM CDT	Severe Thunderstorm Warning	OUN	Garfield	57 min
Jun 30, 2:38 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	37 min
Jun 30, 2:40 AM CDT	Severe Thunderstorm Warning	OUN	Atoka	50 min
Jun 30, 2:43 AM CDT	Flash Flood Warning	OUN	Pottawatomie, Seminole	4 hr
Jun 30, 3:14 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie	46 min
Jun 30, 3:58 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pottawatomie	47 min
Jun 30, 4:43 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	47 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001 Every severe thunderstorm warning in 2001

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.