Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 474, NWS Norman, OK

June 30, 2001Pottawatomie County, Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 30, 2001, 1:27 AM CDT for Pottawatomie County, Seminole County, Oklahoma. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 30, 2001, 1:27 AM CDT (06:27 UTC)
Expired: Jun 30, 2001, 2:15 AM CDT
In force: 48 min
Issued by: NWS Norman, OK
Area: Whole counties

Counties Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 48 km from the middle of the area, began a volume at 06:28 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 30, 1:00 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.5 hours before the alert went out and 56 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

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KOUN 300628
SVROKC
OKC125-133-300715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
127 AM CDT SAT JUN 30 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  POTTAWATOMIE COUNTY IN CENTRAL OKLAHOMA
  SEMINOLE COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 215 AM CDT

* AT 127 AM CDT...DOPPLER RADAR DETECTED A LARGE SEVERE THUNDERSTORM 
4 MILES NORTHEAST OF MAUD...MOVING SOUTH-SOUTHWEST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE BOWLEGS...KONAWA...MAUD...SEMINOLE
  AND ST. LOUIS

HAIL UP TO THE SIZE OF GOLFBALLS IS LIKELY WITH THIS SEVERE THUNDERSTORM.

LAT...LON 3525 9659 3530 t9678 3498 9693 3493 9671

ANDRA

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 42 minutes earlier.

Area forecast discussion, Jun 29, 9:45 PM CDT, 3 hours 42 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.

In the hours before

Local storm report, Jun 30, 1:04 AM CDT, 23 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
104 AM CDT SAT JUN 30 2001

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

0100 AM    PRAGUE                    OK   1.00 INCH HAIL
06/30/01   LINCOLN                        POLICE DEPT REPORT

J

Local storm report, Jun 30, 1:20 AM CDT, 7 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
120 AM CDT SAT JUN 30 2001

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

0105 AM    PR!AGUE                    OK   1.75 INCH HAIL
06/30/01   LINCOLN                        EMERGENCY MANAGER
                                          REPORT

J

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, 12:53 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	37 min
Jun 30, 1:23 AM CDT	Severe Thunderstorm Warning	OUN	Payne	52 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.