Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 115, NWS Tulsa, OK

April 21, 2004Tulsa County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 21, 2004, 7:27 PM CDT for Tulsa County, Oklahoma. It was in force for 63 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 21, 2004, 7:27 PM CDT (00:27 UTC)
Expired: Apr 21, 2004, 8:30 PM CDT
In force: 63 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Tulsa County, OK

The radar

The Tulsa radar (KINX), 36 km from the middle of the area, began a volume at 00:27 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 21, 1:50 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.5 hours before the alert went out and 161 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: 415 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1340 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 357 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 11.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 220027
SVRTUL
OKC143-220130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
728 PM CDT WED APR 21 2004

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN TULSA COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 830 PM CDT

* AT 727 PM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG
  A LINE EXTENDING FROM 3 MILES NORTH OF JENKS TO 6 MILES SOUTHWEST
  OF BIXBY...MOVING EAST AT 30 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...TULSA...
  BIXBY...JENKS...GLENPOOL AND BROKEN ARROW.

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 3617 9577 3591 9577 3591 9583 3586 9583
          3586 9602 3609 9603 3609 9610 3616 9610

$$

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 21, 6:40 PM CDT, 47 minutes earlier.

Area forecast discussion, Apr 21, 6:40 PM CDT, 47 minutes before

AREA FORECAST DISCUSSION...MESOSCALE UPDATE
NATIONAL WEATHER SERVICE TULSA OKLAHOMA
640 PM CDT WED APR 21 2004

A LARGE SUPERCELL IS TRACKING ACROSS NORTHERN CREEK
COUNTY...SOMEWHAT WEAKER DEEP LAYER SHEAR IS RESULTING IN A MORE
HEAVY PRECIPITATION APPEARANCE.  THE ASSOCIATED MESOCYCLONE IS LARGE
AND STRONG...SO A TORNADO IS POSSIBLE WITH THE CELL.  LIFTED INDICES
AHEAD OF THE STORM RANGE FROM -5 TO -8...WITH STORM-RELATIVE
HELICITIES TO 3KM ABOUT 300...BUT TO THE LCL ONLY ABOUT 100.

THE STORM MOVING THROUGH SEQUOYAH COUNTY DID NOT TURN.  THE STORM
BOUNDARY IN THE FORT SMITH AREA HAS PUSHED MORE TO THE SOUTHWEST AND
THE STORM IS LIKLEY BECOMING ELEVATED...MEANING THE TORNADO THREAT
IS DIMINISHING WITH THE CELL...HOWEVER IT WILL NEED TO BE MONITORED
CLOSELY FOR ANOTHER 30 MINUTES OR SO UNTIL IT GETS DEEPER INTO THE
COOLER AIR.

FORECAST ID= 08

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

Hazardous weather outlook, Apr 21, 1:00 PM CDT, 6 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
100 PM CDT WED APR 21 2004

ARZ001-002-010-011-019-020-029-OKZ049-053>076-221100-
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-
100 PM CDT WED APR 21 2004

.DAY ONE...THIS AFTERNOON AND TONIGHT

...SEVERE WEATHER OUTBREAK IS EXPECTED ACROSS EASTERN OKLAHOMA AND
   NORTHWEST ARKANSAS...

SIGNIFICANT SEVERE WEATHER IS EXPECTED ACROSS EASTERN OKLAHOMA AND
NORTHWEST ARKANSAS BEGINNING THIS AFTERNOON AND CONTINUING THROUGH
TONIGHT.  LARGE HAIL...DAMAGING WINDS...AND TORNADOES ARE LIKELY.

INSTABILITY HAS ALREADY BUILT TO IMPRESSIVE LEVELS ACROSS MUCH OF
EASTERN OKLAHOMA AHEAD OF AN APPROACHING MID LEVEL DISTURBANCE.
WIND FIELDS ASSOCIATED WITH THIS DISTURBANCE ARE RATHER STRONG AND
WILL CONTRIBUTE TO A FAVORABLE ENVIRONMENT FOR SUPERCELLS TO DEVELOP.

A STATIONARY FRONT IS LOCATED FROM NEAR JOPLIN MISSOURI STRETCHING
INTO THE TEXAS PANHANDLE.  FURTHER SOUTH...A WEAKER YET PRONOUNCED
OUTFLOW BOUNDARY REMAINS FROM THE PREVIOUS NIGHTS THUNDERSTORMS.
THIS BOUNDARY IS RUNNING VERY NEAR THE ARKANSAS RIVER VALLEY FROM
FORT SMITH WESTWARD AND INTERSECTING THE STATIONARY FRONT ACROSS
CENTRAL OKLAHOMA.  THIS BOUNDARY MAY DRIFT A BIT FURTHER NORTHWARD
HOWEVER THIS GENERAL PLACEMENT IS EXPECTED BY MID AFTERNOON WHEN
INITIAL THUNDERSTORM DEVELOPMENT WILL OCCUR.  ADDITIONAL
THUNDERSTORMS WILL DEVELOP ALONG THE STATIONARY FRONT ACROSS
NORTHERN OKLAHOMA AND SPREAD INTO NORTHEAST OKLAHOMA DURING THE
EVENING.

ACCOMPANYING THE SEVERE WEATHER THREAT WILL BE AN ELEVATED RISK OF
FLASH FLOODING ACROSS NORTHEAST OKLAHOMA WHERE PREVIOUS RAIN EVENTS
HAVE SATURATED THE SOIL LEAVING ANY ADDITIONAL RAINS TO CONTRIBUTE
TO A FLASH FLOOD POTENTIAL.

WARNING PROBABILITIES FOR SEVERE THUNDERSTORMS AND TORNADOES CAN BE
FOUND IN THE CURRENT HAZARDS SECTION AT: WWW.SRH.NOAA.GOV/TULSA.
GIVEN PROBABILITIES REPRESENT THE POTENTIAL FOR A WARNING TO BE
ISSUED AT YOUR LOCATION.

SPOTTER / EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTER ACTIVATION WILL BE REQUIRED LATER TODAY. EMERGENCY
MANAGEMENT PERSONNEL ACROSS THE ENTIRE OUTLOOK AREA SHOULD HAVE
ALREADY COMPLETED PREPARATIONS FOR SIGNIFICANT SEVERE WEATHER.
ADDITIONAL PREPARATIONS FOR POTENTIALLY DAMAGING TORNADOES SHOULD BE
CONSIDERED.  PERSONAL DEDICATED TO MONITORING THE LATEST WEATHER
CONDITIONS AND STATEMENTS IS RECOMMENDED.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
WIDESPREAD AND SIGNIFICANT SEVERE WEATHER WILL AGAIN BE POSSIBLE BOTH
THURSDAY AND FRIDAY.  LATER FORECASTS AND STATEMENTS SHOULD BE
CLOSELY MONITORED FOR FURTHER INFORMATION FOR THIS TIMEFRAME.

A RETURN TO MORE TRANQUIL WEATHER WILL ARRIVE BY THE WEEKEND AND
CONTINUE INTO EARLY NEXT WEEK.

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

In the hours before

Local storm report, Apr 21, 6:46 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
646 PM CDT WED APR 21 2004

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

0630 PM     HAIL             BROKEN ARROW            36.05N 95.79W
04/21/2004  1.00 INCH        TULSA              OK   NWS EMPLOYEE

            HAIL COVERED THE GROUND.

&&
56TH STREET AND 286TH AVE...PART OF BROKEN ARROW IN WAGONER COUNTY.

GW

Local storm report, Apr 21, 6:47 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
647 PM CDT WED APR 21 2004

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

0634 PM     HAIL             MANNFORD                36.13N 96.35W
04/21/2004  1.00 INCH        CREEK              OK   AMATEUR RADIO

&&

GW

Local storm report, Apr 21, 6:56 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
656 PM CDT WED APR 21 2004

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

0629 PM     HAIL             MANNFORD                36.13N 96.35W
04/21/2004  2.75 INCH        CREEK              OK   AMATEUR RADIO

&&

GW

Local storm report, Apr 21, 7:00 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
700 PM CDT WED APR 21 2004

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

0640 PM     HAIL             TULSA                   36.13N 95.92W
04/21/2004  1.75 INCH        TULSA              OK   NWS EMPLOYEE

            REPORTED AT 31ST AND YALE.

&&

GW

Local storm report, Apr 21, 7:16 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
716 PM CDT WED APR 21 2004

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

0609 PM     TSTM WND DMG     SILVER CITY             36.09N 96.49W
04/21/2004                   CREEK              OK   EMERGENCY MNGR

            ONE HALF MILE NORTH OF SILVER CITY...TWO MOBILE HOMES
            DESTROYED...AND TREES UPROOTED.

&&

GW

Local storm report, Apr 21, 7:19 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
719 PM CDT WED APR 21 2004

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

0622 PM     TSTM WND DMG     4 SW MANNFORD           36.09N 96.40W
04/21/2004                   CREEK              OK   BROADCAST MEDIA

            BUILDING DAMAGED.

&&
EXTENT OF DAMAGE UNKNOWN.

GW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 7:09 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	81 min
Apr 21, 7:13 PM CDT	Severe Thunderstorm Warning	TSA	Creek	47 min
Apr 21, 8:23 PM CDT	Flash Flood Warning	TSA	Cherokee	4 hr
Apr 21, 9:08 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	37 min
Apr 21, 9:14 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	61 min
Apr 21, 9:25 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	65 min
Apr 21, 9:58 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee, Okmulgee	62 min
Apr 21, 10:02 PM CDT	Severe Thunderstorm Warning	TSA	Adair	43 min
Apr 21, 10:08 PM CDT	Severe Thunderstorm Warning	TSA	Haskell	67 min
Apr 21, 10:40 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	65 min
Apr 21, 10:44 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Okfuskee	61 min
Apr 21, 10:53 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	52 min
Apr 21, 11:01 PM CDT	Tornado Warning	TSA	McIntosh	59 min
Apr 21, 11:16 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	59 min
Apr 21, 11:24 PM CDT	Tornado Warning	TSA	Haskell, Pittsburg	66 min
Apr 21, 11:41 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	49 min
Apr 21, 11:49 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	71 min
Apr 21, 11:56 PM CDT	Tornado Warning	TSA	McIntosh	64 min
Apr 22, 12:03 AM CDT	Tornado Warning	TSA	Haskell	42 min
Apr 22, 12:28 AM CDT	Tornado Warning	TSA	LeFlore	47 min
Apr 22, 12:29 AM CDT	Tornado Warning	TSA	Haskell, Muskogee	76 min
Apr 22, 12:43 AM CDT	Severe Thunderstorm Warning	TSA	Creek	62 min
Apr 22, 1:00 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Tulsa, Washington	60 min
Apr 22, 1:16 AM CDT	Flash Flood Warning	TSA	LeFlore	4 hr
Apr 22, 1:23 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	67 min
Apr 22, 1:34 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	56 min
Apr 22, 1:38 AM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	52 min
Apr 22, 1:49 AM CDT	Severe Thunderstorm Warning	TSA	Nowata, Rogers, Wagoner	41 min
Apr 22, 2:10 AM CDT	Severe Thunderstorm Warning	TSA	Mayes	35 min
Apr 22, 2:39 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh	51 min
Apr 22, 3:21 AM CDT	Severe Thunderstorm Warning	TSA	Muskogee	24 min
Apr 22, 3:29 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa, Wagoner	76 min
Apr 22, 3:50 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	70 min
Apr 22, 3:53 PM CDT	Tornado Warning	TSA	Wagoner	37 min
Apr 22, 3:56 PM CDT	Tornado Warning	TSA	Rogers	64 min
Apr 22, 4:20 PM CDT	Tornado Warning	TSA	Tulsa	55 min
Apr 22, 4:27 PM CDT	Tornado Warning	TSA	Mayes	63 min
Apr 22, 4:34 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	56 min
Apr 22, 4:36 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	24 min
Apr 22, 4:42 PM CDT	Tornado Warning	TSA	Wagoner	63 min
Apr 22, 5:03 PM CDT	Tornado Warning	TSA	Cherokee, Delaware	72 min
Apr 22, 5:11 PM CDT	Tornado Warning	TSA	Okmulgee, Tulsa	34 min
Apr 22, 5:25 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	80 min
Apr 22, 5:26 PM CDT	Tornado Warning	TSA	Mayes	34 min
Apr 22, 5:30 PM CDT	Tornado Warning	TSA	Muskogee	60 min
Apr 22, 5:40 PM CDT	Tornado Warning	TSA	Wagoner	65 min
Apr 22, 5:45 PM CDT	Tornado Warning	TSA	Okmulgee	60 min
Apr 22, 5:48 PM CDT	Tornado Warning	TSA	Adair	57 min
Apr 22, 5:54 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	51 min
Apr 22, 6:05 PM CDT	Severe Thunderstorm Warning	TSA	Craig	55 min
Apr 22, 6:26 PM CDT	Tornado Warning	TSA	Muskogee	64 min
Apr 22, 6:31 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	59 min
Apr 22, 6:36 PM CDT	Tornado Warning	TSA	Cherokee	54 min
Apr 22, 6:41 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	64 min
Apr 22, 6:41 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	79 min
Apr 22, 6:45 PM CDT	Tornado Warning	TSA	Adair	60 min
Apr 22, 6:51 PM CDT	Tornado Warning	TSA	Craig, Ottawa	54 min
Apr 22, 6:55 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	95 min
Apr 22, 6:56 PM CDT	Flash Flood Warning	TSA	Adair, Cherokee, Muskogee, Okmulgee, Wagoner	4 hr

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.