Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 481, NWS Norman, OK

June 30, 2001Garvin County, McClain County, Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 30, 2001, 3:58 AM CDT for Garvin County, McClain County, Pottawatomie County, Oklahoma. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jun 30, 2001, 3:58 AM CDT (08:58 UTC)
Expired: Jun 30, 2001, 4:45 AM CDT
In force: 47 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Garvin County, OK, McClain County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 51 km from the middle of the area, began a volume at 08:58 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

Time	Report	Where	Remark
Jun 30, 4:00 AM CDT	Thunderstorm Wind	Byars, OK	A wishing well was blown over.

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
Jun 30, 1:00 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 9.0 hours before the alert went out and 46 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 300859
SVROKC
OKC049-087-125-300945-

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

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MCCLAIN COUNTY IN CENTRAL OKLAHOMA
  POTTAWATOMIE COUNTY IN CENTRAL OKLAHOMA
  NORTHEAST GARVIN COUNTY IN SOUTHERN OKLAHOMA

* UNTIL 445 AM CDT

* AT 358 AM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM OVER
  WANETTE...MOVING SOUTH AT 30 MPH.

* LOCATIONS IN THE WARNING INCLUDE ASHER...BYARS...ROSEDALE...
  STRATFORD AND WANETTE

HAIL UP TO THE SIZE OF GOLFBALLS AND WINDS TO 65 MPH ARE LIKELY WITH 
THIS SEVERE THUNDERSTORM.

LAT...LON 3507 9691 3502 9717 3488 9728 3471 9721
          3467 9693
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 30, 3:40 AM CDT, 18 minutes earlier.

Area forecast discussion, Jun 30, 3:40 AM CDT, 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
340 AM CDT SAT JUN 30 2001

LATEST ROUND OF OVERNIGHT CONVECTION LOCATED GENERALLY NEAR AND EAST
OF INTERSTATE 35 WILL CONTINUE TO TRACK SOUTH ACROSS THE SOUTHEAST
AND SOUTH CENTRAL ZONES DURING THE EARLY MORNING HOURS. TRAINING OF
SOME OF THE ECHOES HAVE LED TO LOCALLY HEAVY RAIN FROM STILLWATER
SOUTH THROUGH SHAWNEE. LOW LEVEL WARM ADVECTION OCCURRING ON THE
WEST SIDE OF THE SOUTHERN MISSOURI UPPER LOW HAS BEEN SUPPORTING
CONVECTION. MEANWHILE SCATTERED SHOWERS IN SOUTHWEST OKLAHOMA AND
WESTERN NORTH TEXAS WERE ALSO OCCURRING IN AN AREA OF LOW LEVEL WARM
ADVECTION. LOOK FOR THE CONVECTION TO DIMINISH DURING THE MORNING AS
WARM ADVECTION PATTERNS AND INSTABILITIES WEAKEN. MEANWHILE... THE
UPPER LOW IS EXPECTED TO CONTINUE TO WEAKEN WHILE BECOMING MORE
SHEARED AS IT MOVES TOWARDS SOUTH TEXAS. LOOKS LIKE RAIN CHANCES
WILL END IN THE SOUTHERN ZONES BY MONDAY. IN THE MEANTIME... WILL GO
WITH HIGH POPS FOR MAINLY THIS MORNING NEAR AND DOWNSTREAM OF
CURRENT CONVECTION... WITH DECREASING POPS TO THE NORTHWEST. ANY
REMAINING BOUNDARIES FROM MORNING TSTMS COULD ACT AS A FOCUS FOR
ADDITIONAL DEVELOPMENT THIS AFTERNOON. AFTERNOON HIGHS WILL BE
AFFECTED BY MORNING CLOUDS AND RAIN...WITH MID 80S IN THE
SOUTHEAST... WARMING INTO THE MID 90S IN THE WEST.

IN THE LONGER TERM... MADE LITTLE CHANGE TO GOING FORECAST. LOOKS
LIKE GENERALLY DRY WEATHER EARLY IN THE WEEK. HOWEVER... CHANCE OF
TSTMS POSSIBLE FOURTH OF JULY NIGHT AS A COLD FRONT MOVES ACROSS THE
AREA... BRINGING SOMEWHAT COOLER WEATHER FOR THURSDAY.

FCSTID = 32
OKC   88  69  90  68 /  30  20  20   0
HBR   92  68  93  69 /  20  10  10   0
SPS   92  69  93  70 /  30  20  20  20
GAG   91  66  91  65 /  10  10  10   0
PNC   88  68  89  68 /  20  10  20   0
DUA   85  68  89  68 /  40  30  20  20

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

%

In the hours before

Local storm report, Jun 30, 1:04 AM CDT, 2 hours 54 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, 2 hours 38 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

Local storm report, Jun 30, 2:04 AM CDT, 1 hour 54 minutes before

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

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

0156 AM    STROUD                    OK   1.00 INCH HAIL
06/30/01   LINCOLN                        AMATURE RADIO REPORT

0200 AM    STILLWATER                OK   .75 INCH HAIL
06/30/01   PAYNE                          AMATURE RADIO REPORT

J

Local storm report, Jun 30, 3:00 AM CDT, 58 minutes before

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

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

0250 AM    3 W DAISY                 OK   WIND DAMAGE
06/30/01   ATOKA                          SHERIFF OFFICE REPORTS
                                          LARGE TREE BLOWN ONTO
                                          MOBILE HOME AND POWER LINES
                                          DOWN.

J

Local storm report, Jun 30, 3:46 AM CDT, 12 minutes before

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

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

0210 AM    PE$RKINS                   OK   1.75 INCH HAIL
06/30/01   PAYNE                          SPOTTER 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, 1:27 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, 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.