Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 199, NWS Norman, OK

May 18, 2001Jackson County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2001, 1:30 AM CDT for Jackson County, Oklahoma. It was in force for 45 min. 3 reports 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: May 18, 2001, 1:30 AM CDT (06:30 UTC)
Expired: May 18, 2001, 2:15 AM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Jackson County, OK

What was reported inside it

Time	Report	Where
May 18, 1:38 AM CDT	Thunderstorm Wind 84 M	Altus Afb, OK
May 18, 1:40 AM CDT	Thunderstorm Wind 52 E	Altus, OK
May 18, 2:20 AM CDT	Thunderstorm Wind 61 E	Cache, 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.

Issued	Product	Office	Lasted
May 17, 9:30 PM 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 204 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: 2992 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 180631
SVROKC
OKC065-180715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
130 AM CDT FRI MAY 18 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JACKSON COUNTY IN SOUTHWEST OKLAHOMA

* UNTIL 215 AM CDT

* AT 130 AM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 9
  MILES WEST OF OLUSTEE...MOVING EAST AT 25 MPH.

* LOCATIONS IN dTHE WARNING INCLUDE ALTUS AIR FORCE BASE...ALTUS...
  DUKE...ELMER AND OLUSTEE

WIND GUSTS TO 70 MPH CAN BE EXPECTED WITH THIS SEVERE THUNDERSTORM.

LAT...LON 3471 9965 3447 9967 3440 9942 3469 9910
JAMES

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 17, 9:35 PM CDT, 3 hours 55 minutes earlier.

Area forecast discussion, May 17, 9:35 PM CDT, 3 hours 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
935 PM CDT THU MAY 17 2001

LATEST WATER VAPOR/IR IMAGERY/00Z ANALYSIS SHOW UVV'S NOW MOVING
INTO WESTERN OKLAHOMA AND WESTERN NORTH TEXAS AND WILL BE
RESPONSIBLE FOR INCREASING/INTENSIFYING CONVECTION ACROSS THE
FORECAST AREA OVERNIGHT...PARTICULARLY THE WESTERN HALF. 02Z SURFACE
ANALYSIS SHOWS OUTFLOW BOUNDARY NEARLY STATIONARY FROM SOUTH OF
TULSA EXTENDING WESTWARD ALONG INTERSTATE 40 TO NEAR WEATHERFORD.
BOUNDARY THEN HARD TO DISCERN AS IT MERGES WITH PRE-FRONTAL TROUGH
EXTENDING SOUTHWEST TOWARD MIDLAND. COLD FRONT NOW INTO NORTHWEST
OKLAHOMA. WITH ABOVE MENTIONED CONCERNS...WILL MAINTAIN HIGHEST POPS
AND SEVERE WORDING ACROSS THE WESTERN HALF OF AREA OVERNIGHT.

ANOTHER CONCERN THIS EVENING HAS BEEN NEARLY STATIONARY
THUNDERSTORM OVER BECKHAM COUNTY NEAR SAYRE WITH KFDR WSR-88D
INDICATING 3 TO 4 INCHES OF RAIN PER HOUR. BELIEVE HAIL HAS
CONTAMINATED THE TOTALS SLIGHTLY BUT WITH HIGH PRECIPITABLE WATER
AND WEAK WINDS ALOFT...2 TO 3 INCHES PER HOUR MAY BE POSSIBLE.
MID/UPPER LEVEL WILL INCREASE SLIGHTLY AS SHORTWAVE TROUGHS TO THE
WEST APPROACH AND MAY ALLEVIATE THE LOCALLY HEAVY RAIN A LITTLE AS
THE NIGHT PROGRESSES.

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

In the hours before

Local storm report, May 17, 9:06 PM CDT, 4 hours 24 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
906 PM CDT THU MAY 17 2001

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

0905 PM    2 S SAYRE                 OK   1.75 INCH HAIL
05/17/01   BECKHAM                        AMATURE RADIO REPORT

J

Local storm report, May 18, 12:09 AM CDT, 1 hour 21 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1209 AM CDT FRI MAY 18 2001

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

1141 PM    2I NE KINGFISHER           OK   WIND DAMAGE
05/17/01   KINGFISHER                     4 TO 5 POWER POLES SNAPPED
                                          AND DOWN. REPORTED BY EM

Local storm report, May 18, 12:22 AM CDT, 1 hour 8 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1222 AM CDT FRI MAY 18 2001

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

1221 AM    37 W ELDORADO              OK   1.00 INCH HAIL
05/18/01   JACKSON                        AMATURE RADIO REPORT.

J

Local storm report, May 18, 12:29 AM CDT, 1 hour 1 minute before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1229 AM CDT FRI MAY 18 2001

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

1228 AM    EzLDORADO                  OK   1.75 INCH HAIL
05/18/01   JACKSON                        AMATURE RADIO REPORT.

J

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:17 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	43 min
May 17, 8:58 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	47 min
May 17, 10:29 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	46 min
May 17, 11:38 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	52 min
May 18, 12:18 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	42 min
May 18, 1:46 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	44 min
May 18, 1:51 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	39 min
May 18, 2:18 AM CDT	Severe Thunderstorm Warning	OUN	Cotton	42 min
May 18, 2:30 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	45 min
May 18, 2:37 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	53 min
May 18, 2:37 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	53 min
May 18, 2:41 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	64 min
May 18, 2:59 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Logan, Oklahoma	61 min
May 18, 2:59 AM CDT	Severe Thunderstorm Warning	OUN	McClain	61 min
May 18, 3:17 AM CDT	Severe Thunderstorm Warning	OUN	Garvin	43 min
May 18, 3:22 AM CDT	Flash Flood Warning	OUN	Kingfisher	3 hr
May 18, 3:27 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Murray	48 min
May 18, 3:37 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	53 min
May 18, 4:03 AM CDT	Severe Thunderstorm Warning	OUN	Johnston, Pontotoc, Seminole	57 min
May 18, 4:22 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	38 min
May 18, 4:35 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	55 min
May 18, 4:59 AM CDT	Severe Thunderstorm Warning	OUN	Atoka	61 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.