Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 371, NWS Norman, OK

May 31, 2001Bryan County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 31, 2001, 2:01 AM CDT for Bryan County, Oklahoma. It was in force for 59 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 31, 2001, 2:01 AM CDT (07:01 UTC)
Expired: May 31, 2001, 3:00 AM CDT
In force: 59 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Bryan County, OK

The radar

The Norman radar (KTLX), 179 km from the middle of the area, began a volume at 07:02 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 31, 2:10 AM CDT	Thunderstorm Wind 52 E	Roberta, 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

Fort Worth, TX (KFWD), launched 00:00Z, 7.0 hours before the alert went out and 158 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: 3359 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1522 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.6

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 30, 10:31 PM CDT, 3 hours 30 minutes earlier.

Area forecast discussion, May 30, 10:31 PM CDT, 3 hours 30 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1031 PM CDT WED MAY 30 2001

SAME SONG...DIFFERENT VERSE...ANOTHER ACTIVE NIGHT ACROSS THE CWA.
HOWEVER...THINGS SEEM TO BE ON THE DOWNWARD TREND...AS SUPERCELL
PROPAGATING ALONG OLD SURFACE BOUNDARY OVER NORTH TEXAS BECOMES MORE
DISORGANIZED WITH TIME. MAIN CONCERN WITH ZONE UPDATE IS WHAT TO DO
WITH POPS. ALREADY SENT UPDATED ZONES TO INCREASE THEM ACROSS WEST
CENTRAL ZONES TO HANDLE SOUTHEASTERLY MOVING CONVECTIVE COMPLEX
ACROSS TEXAS PANHANDLE. HOWEVER...NORTHERN EDGE OF COMPLEX CONTINUES
TO SHOW A DOWNWARD TREND. WITH ABSENCE OF LOW LEVEL FORCING
MECHANISM...HAVE REMOVED POPS ACROSS NORTH CENTRAL AND LOWERED THEM
ACROSS THE CENTRAL ZONES. LEFT POPS HIGH ACROSS SOUTHERN PORTIONS OF
THE AREA...TO ACCOUNT FOR WEST TEXAS MCS...AND PRESENCE OF 850
BOUNDARY ACROSS NORTH TEXAS. OTHERWISE...MADE ONLY MINOR TWEAKS TO
TEMPS AND WINDS.

LANE

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

In the hours before

Local storm report, May 30, 9:38 PM CDT, 4 hours 23 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
938 PM CDT WED MAY 30 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0935 PM    7W. MUNDAY                 TX   1.75 INCH HAIL
05/30/01   KNOX                           SPOTTER REPORT

CW

Local storm report, May 30, 9:44 PM CDT, 4 hours 17 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
944 PM CDT WED MAY 30 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0940 PM    11nSSW WINDTHORST          TX   .88 INCH HAIL
05/30/01   ARCHER                         PUBLIC REPORT

CW

Local storm report, May 30, 9:53 PM CDT, 4 hours 8 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
953 PM CDT WED MAY 30 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0945 PM    E eSIDE MUNDAY             TX   1.00 INCH HAIL
05/30/01   KNOX                           CO-OP OBSERVER

CW

Local storm report, May 30, 10:23 PM CDT, 3 hours 38 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1023 PM CDT WED MAY 30 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1010 PM    10SW HOLLIDAY             TX   1.00 INCH HAIL
05/30/01   ARCHER                         PUBLIC AT LAKE KICKAPOO

CW

Local storm report, May 31, 12:16 AM CDT, 1 hour 45 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1216 AM CDT THU MAY 31 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1211 AM    A3TOKA                     OK   .75 INCH HAIL
05/31/01   ATOKA                          SHERIFFS OFFICE REPORT

CW

Local storm report, May 31, 12:21 AM CDT, 1 hour 40 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1221 AM CDT THU MAY 31 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1221 AM    BYERS                     TX   .75 INCH HAIL
05/31/01   CLAY                           SPOTTER REPORT

CW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:16 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	34 min
May 30, 7:28 PM CDT	Tornado Warning	OUN	Hughes	32 min
May 30, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Johnston, Murray, Pontotoc	48 min
May 30, 9:00 PM CDT	Severe Thunderstorm Warning	OUN	Murray	30 min
May 30, 9:19 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	41 min
May 30, 11:21 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	39 min
May 30, 11:26 PM CDT	Severe Thunderstorm Warning	OUN	Carter	49 min
May 31, 12:05 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson	40 min
May 31, 12:10 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	65 min
May 31, 1:13 AM CDT	Severe Thunderstorm Warning	OUN	Atoka	47 min
May 31, 3:27 AM CDT	Severe Thunderstorm Warning	OUN	Bryan	48 min
May 30, 7:12 PM CDT	Severe Thunderstorm Warning	OUN	Clay	48 min
May 30, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	35 min
May 30, 7:40 PM CDT	Tornado Warning	OUN	Archer, Wichita	50 min
May 30, 7:58 PM CDT	Severe Thunderstorm Warning	OUN	Clay	47 min
May 30, 8:27 PM CDT	Tornado Warning	OUN	Archer	48 min
May 30, 8:43 PM CDT	Severe Thunderstorm Warning	OUN	Clay	47 min
May 30, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Archer	47 min
May 30, 9:23 PM CDT	Severe Thunderstorm Warning	OUN	Knox	52 min
May 30, 9:58 PM CDT	Severe Thunderstorm Warning	OUN	Archer	47 min
May 30, 10:12 PM CDT	Flash Flood Warning	OUN	Archer	3 hr
May 30, 10:44 PM CDT	Severe Thunderstorm Warning	OUN	Archer	46 min
May 30, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	49 min
May 30, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Knox	43 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.