Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 80, NWS Tulsa, OK

April 20, 2004Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 20, 2004, 7:43 PM CDT for Osage County, Oklahoma. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 20, 2004, 7:43 PM CDT (00:43 UTC)
Expired: Apr 20, 2004, 8:30 PM CDT
In force: 47 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Osage County, OK

The radar

The Tulsa radar (KINX), 62 km from the middle of the area, began a volume at 00:42 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 20, 2:05 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 0.7 hours before the alert went out and 117 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: 664 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1263 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 210043
SVRTUL
OKC113-210130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
743 PM CDT TUE APR 20 2004

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN OSAGE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 830 PM CDT

* AT 743 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR 
  PRUE...MOVING EAST AT 25 MPH.

.

HAIL TO THE SIZE OF PENNIES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED 
IN THE WARNED AREA. STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE 
STORM HAS PASSED.

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. BE ALERT FOR RAPIDLY
CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

LAT...LON 3634 9636 3626 9640 3617 9609 3633 9601

$$

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 6:41 PM CDT, 1 hour 2 minutes earlier.

Area forecast discussion, Apr 20, 6:41 PM CDT, 1 hour 2 minutes before

MESOSCALE FORECAST DISCUSSION...MESOSCALE UPDATE
NATIONAL WEATHER SERVICE TULSA OKLAHOMA
641 PM CDT TUE APR 20 2004

LATEST HIGH RESOLUTION MESOSCALE ANALYSIS GRIDS SHOW AND AXIS OF 150
TO 250 M2/S2 3KM STORM-RELATIVE HELICITIES IN ADVANCE OF THE
WASHINGTON AND CREEK COUNTY SUPERCELLS WITH LIFTED INDICES TO -4.
THE BEST PHASED INSTABILITY AND WIND PROFILES EXIST FROM THE STORMS
EASTWARD TO CRAIG...ROGERS AND WESTERN WAGONER COUNTIES.  THIS WILL
SUPPORT A SEVERE THREAT ACROSS THE TULSA METRO AREA AND INTO NOWATA
COUNTY WITH THESE TWO STORMS.

IF THE HIGHER HELICITY REMAINS IN PLACE AHEAD OF THE TWO CELLS...
THEN THERE WILL BE SOME INCREASE IN TORNADO POTENTIAL AND THESE CELL
WILL NEED TO BE MONITORED CLOSELY.

FORECAST ID= 08

.TSA WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
OK...NONE.

Hazardous weather outlook, Apr 20, 7:00 PM CDT, 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
700 PM CDT TUE APR 20 2004

ARZ001-002-010-011-019-020-029-OKZ049-053>076-210300-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CHOCTAW OK-CRAIG OK-
CRAWFORD AR-CREEK OK-DELAWARE OK-FRANKLIN AR-HASKELL OK-LATIMER OK-
LE FLORE OK-MADISON AR-MAYES OK-MCINTOSH OK-MUSKOGEE OK-NOWATA OK-
OKFUSKEE OK-OKMULGEE OK-OSAGE OK-OTTAWA OK-PAWNEE OK-PITTSBURG OK-
PUSHMATAHA OK-ROGERS OK-SEBASTIAN AR-SEQUOYAH OK-TULSA OK-WAGONER OK-
WASHINGTON OK-WASHINGTON AR-
700 PM CDT TUE APR 20 2004

THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

...TORNADO WATCH UNTIL 8PM FOR MUCH OF NORTHEAST OKLAHOM AND FAR
NORTHWEST ARKANSAS...

THUNDERSTORMS...SOME SEVERE...WILL CONTINUE TO MOVE ACROSS NORTHEAST
OKLAHOMA DURING THE EVENING AND COULD DEVELOP A LITTLE FURTHER SOUTH
TOWARD EAST-CENTRAL OKLAHOMA.  THE ATMOSPHERE WILL BEGIN TO
STABILIZE AFTER SUNSET...DIMINISHING THE THREAT...BUT THUNDERTORMS
MAY PERSIST INTO NORTHWEST ARKANSAS DURING THE EARLY NIGHT-TIME
HOURS.

THROUGH 8PM CONDITIONS WILL FAVOR SOME STORMS HAVING SUPERCELL
CHARACTERISTICS.

SPOTTER / EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTERS AND EMERGENCY MANAGERS IN THE TORNADO WATCH AREA SHOULD
REMAIN ACTIVE AND REPORT INFORMATION TO THE NATIONAL WEATHER
SERVICE.  SPOTTERS IN SOUTHEAST OKLAHOMA AND WEST-CENTRAL ARKANSAS
SHOULD CONTINUE TO MONITOR THE PROGRESS OF THESE STORMS IN CASE THEY
DEVELOP FURTHER SOUTH.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
AN UNSETTLED WEATHER PATTERN WILL CONTINUE THROUGH MUCH OF THE
EXTENDED OUTLOOK PERIOD.  CURRENTLY...THE BEST CHANCES OF
SIGNIFICANT SEVERE WEATHER APPEAR TO BE ON THURSDAY AND/OR FRIDAY.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL TABULAR AND GRAPHICAL
INFORMATION

In the hours before

Local storm report, Apr 20, 6:27 PM CDT, 1 hour 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
627 PM CDT TUE APR 20 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0620 PM     HAIL             3 N COPAN               36.94N 95.93W
04/20/2004  0.88 INCH        WASHINGTON         OK   AMATEUR RADIO

&&

GW

Local storm report, Apr 20, 6:49 PM CDT, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
649 PM CDT TUE APR 20 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0645 PM     HAIL             MANNFORD                36.13N 96.35W
04/20/2004  0.75 INCH        CREEK              OK   TRAINED SPOTTER

&&

RDU

Local storm report, Apr 20, 6:54 PM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
654 PM CDT TUE APR 20 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0620 PM     HAIL             BARTLESVILLE            36.75N 95.98W
04/20/2004  1.00 INCH        WASHINGTON         OK   TRAINED SPOTTER

0605 PM     HAIL             OKESA                   36.71N 96.13W
04/20/2004  1.00 INCH        OSAGE              OK   TRAINED SPOTTER

&&

RDU

Local storm report, Apr 20, 7:16 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
716 PM CDT TUE APR 20 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0710 PM     TORNADO          1 N SAPULPA             36.01N 96.11W
04/20/2004                   CREEK              OK   TRAINED SPOTTER

&&

RDU

Local storm report, Apr 20, 7:35 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
735 PM CDT TUE APR 20 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0729 PM     HAIL             RAMONA                  36.53N 95.92W
04/20/2004  1.75 INCH        WASHINGTON         OK   PUBLIC

&&

RDU

Local storm report, Apr 20, 7:43 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
743 PM CDT TUE APR 20 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0736 PM     HAIL             3 SW DEPEW              35.77N 96.54W
04/20/2004  1.75 INCH        CREEK              OK   TRAINED SPOTTER

&&

RDU

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 7:06 PM CDT	Severe Thunderstorm Warning	TSA	Washington	54 min
Apr 20, 7:08 PM CDT	Tornado Warning	TSA	Creek, Tulsa	52 min
Apr 20, 7:10 PM CDT	Severe Thunderstorm Warning	TSA	Creek	65 min
Apr 20, 7:16 PM CDT	Tornado Warning	TSA	Washington	44 min
Apr 20, 7:25 PM CDT	Tornado Warning	TSA	Rogers	50 min
Apr 20, 7:30 PM CDT	Severe Thunderstorm Warning	TSA	Craig	45 min
Apr 20, 7:39 PM CDT	Tornado Warning	TSA	Wagoner	36 min
Apr 20, 7:41 PM CDT	Tornado Warning	TSA	Creek	64 min
Apr 20, 7:52 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	23 min
Apr 20, 8:03 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	57 min
Apr 20, 8:15 PM CDT	Tornado Warning	TSA	Craig, Ottawa	45 min
Apr 20, 8:19 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers	41 min
Apr 20, 8:25 PM CDT	Tornado Warning	TSA	Wagoner	50 min
Apr 20, 8:28 PM CDT	Tornado Warning	TSA	Okmulgee	47 min
Apr 20, 8:43 PM CDT	Severe Thunderstorm Warning	TSA	Mayes	47 min
Apr 20, 8:44 PM CDT	Severe Thunderstorm Warning	TSA	Creek	46 min
Apr 20, 8:51 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	39 min
Apr 20, 9:02 PM CDT	Tornado Warning	TSA	Muskogee	43 min
Apr 20, 9:08 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	37 min
Apr 20, 9:13 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Wagoner	47 min
Apr 20, 9:21 PM CDT	Tornado Warning	TSA	Okfuskee	24 min
Apr 20, 9:29 PM CDT	Tornado Warning	TSA	Okmulgee	46 min
Apr 20, 9:31 PM CDT	Severe Thunderstorm Warning	TSA	Creek	44 min
Apr 20, 9:41 PM CDT	Severe Thunderstorm Warning	TSA	Delaware	49 min
Apr 20, 9:44 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	46 min
Apr 20, 10:22 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	38 min
Apr 20, 10:24 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	51 min
Apr 20, 10:52 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee, Okmulgee	38 min
Apr 21, 3:18 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	42 min
Apr 21, 3:53 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	67 min
Apr 21, 4:29 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	76 min
Apr 21, 4:41 PM CDT	Tornado Warning	TSA	Sequoyah	64 min
Apr 21, 5:01 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	74 min
Apr 21, 5:08 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	82 min
Apr 21, 5:24 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	51 min
Apr 21, 5:28 PM CDT	Tornado Warning	TSA	Sequoyah	62 min
Apr 21, 5:56 PM CDT	Severe Thunderstorm Warning	TSA	Creek	79 min
Apr 21, 6:12 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	63 min
Apr 21, 6:16 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	59 min
Apr 21, 6:19 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa	56 min
Apr 21, 6:21 PM CDT	Tornado Warning	TSA	Creek	54 min
Apr 21, 6:26 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	64 min
Apr 21, 6:30 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	30 min
Apr 21, 6:33 PM CDT	Tornado Warning	TSA	Tulsa	57 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2004 Every severe thunderstorm warning in 2004

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.