Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 87, NWS Tulsa, OK

April 20, 2004Okfuskee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 20, 2004, 9:08 PM CDT for Okfuskee County, Oklahoma. It was in force for 37 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, 9:08 PM CDT (02:08 UTC)
Expired: Apr 20, 2004, 9:45 PM CDT
In force: 37 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Okfuskee County, OK

The radar

The Norman radar (KTLX), 87 km from the middle of the area, began a volume at 02:11 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, 7:50 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.1 hours before the alert went out and 102 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3300 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 210208
SVRTUL
OKC107-210245-

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN OKFUSKEE COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 945 PM CDT

* AT 907 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4
  MILES WEST OF WELTY...MOVING EAST AT 30 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...OKFUSKEE AND
  WELTY.

HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 70 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 3566 9655 3554 9657 3548 9608 3564 9613

$$

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, 8:35 PM CDT, 33 minutes earlier.

Area forecast discussion, Apr 20, 8:35 PM CDT, 33 minutes before

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

LATEST RUC OUTPUT INDICATES CAPE VALUES FROM NEAR 2000 J/KG OVER
OSAGE COUNTY LOWERING TO NEAR 600 J/KG OVER NORTHWEST ARKANSAS.
MODEL SUGGESTS THESE VALUES WILL GRADUALLY DIMINISH OVER THE NEXT
SEVERAL HOURS.  HOWEVER...HELICITY IS FORECAST TO INCREASE OVER
NORTHEAST OKLAHOMA WITH THE HIGHEST VALUES ALONG AND JUST SOUTHEAST
OF INTERSTATE 44 THROUGH 10 PM.  THIS COMBINATION SHOULD KEEP THE
ATMOSPHERE FAVORABLE FOR SUPERCELLS THROUGH LATE EVENING.

FORECAST ID= 02

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

Hazardous weather outlook, Apr 20, 8:30 PM CDT, 38 minutes before

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

ARZ001-002-010-011-019-020-029-OKZ049-053>076-210600-
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-
830 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 1AM FOR MUCH OF EASTERN OKLAHOMA AND
NORTHWEST ARKANSAS...

THUNDERSTORMS...SOME SEVERE...WILL CONTINUE TO MOVE ACROSS NORTHEAST
OKLAHOMA THROUGH THE REMAINDER OF THE EVENING AND PERSIST INTO
NORTHWEST ARKANSAS INTO THE EARLY NIGHT-TIME HOURS.

CONDITIONS WILL REMAIN FAVORABLE FOR SOME STORMS TO CONTINUE SHOWING
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, 6:54 PM CDT, 2 hours 14 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, 1 hour 52 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, 1 hour 33 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, 1 hour 25 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

Local storm report, Apr 20, 9:01 PM CDT, 7 minutes before

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

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

0855 PM     HAIL             BALD HILL               35.74N 95.84W
04/20/2004  1.75 INCH        OKMULGEE           OK   BROADCAST MEDIA

&&

RDU

Special weather statement, Apr 20, 9:07 PM CDT, 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
907 PM CDT TUE APR 20 2004

ARZ001-OKZ063-210300-
BENTON AR-DELAWARE OK-
907 PM CDT TUE APR 20 2004

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 1000 PM CDT
FOR THE FOLLOWING COUNTIES:

IN NORTHWEST ARKANSAS
     BENTON

IN NORTHEAST OKLAHOMA
     DELAWARE

AT 907 PM CDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 7 MILES NORTHEAST OF GROVE TO 7 MILES WEST OF
LEACH...MOVING EAST AT 25 MPH.

A LARGE PORTION OF BENTON AND DELAWARE COUNTIES WILL BE AFFECTED BY
THESE STORMS THROUGH 1000 PM CDT.

THESE STORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 50 MPH.
RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE THE SIGNIFICANT
WEATHER ALERT IS UPGRADED TO A WARNING.

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, 7:43 PM CDT	Severe Thunderstorm Warning	TSA	Osage	47 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, 9:13 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.