Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 581, NWS Norman, OK

July 7, 2004Johnston County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 7, 2004, 6:05 AM CDT for Johnston County, Oklahoma. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 7, 2004, 6:05 AM CDT (11:05 UTC)
Expired: Jul 7, 2004, 6:45 AM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Johnston County, OK

The radar

The Norman radar (KTLX), 126 km from the middle of the area, began a volume at 11:08 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.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 11.1 hours before the alert went out and 121 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: 3161 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 985 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Jul 7, 3:59 AM CDT, 2 hours 6 minutes earlier.

Area forecast discussion, Jul 7, 3:59 AM CDT, 2 hours 6 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
400 AM CDT WED JUL  7 2004

.DISCUSSION...
DIFFICULT TASK OF ASSIGNING POPS TO FIRST 6 HOURS OF SO
THIS MORNING.  APPEARS NEW CONVECTION IS DEVELOPING ALONG
832 MB FRONT WITH LARGER CLUSTER OF STORMS PROPAGATING SOUTH
AND SOUTHEAST.  ALSO ELEVATED ECHOS OVER SOUTHWEST KANSAS MOVING
SE INTO NORTHWEST PARTS OF THE STATE.  THINK THAT LARGER CLUSTER
OF STORMS OVER SOUTHWEST PART OF FA WILL BE MAINLY CLEAR OF TEXAS
COUNTIES BY SUNRISE OR SHORTLY AFTER.  ANOTHER LARGER CLUSTER
MAY EVENTUALLY DEVELOP OVER CENTRAL OKLAHOMA AND THEN MOVE INTO
SOUTH CENTRAL AND SOUTHEAST OKLAHOMA THIS MORNING.

AFTER THIS...MODELS LIFT FRONT BACK TO THE NORTH TODAY AND THIS
WILL BE FOCUS FOR STORMS MOVING BACK INTO NORTHERN PARTS OF THE
AREA LATER TONIGHT.  APPEARS BEST CHANCE WILL BE ACROSS NORTH CENTRAL
OKLAHOMA BUT CONFIDENCE IN THIS IS RATHER LOW.  AFTER WEDNESDAY
NIGHT APPEARS THAT MORE SUMMER-LIKE WEATHER IS IN STORE FOR SOUTHERN
PLAINS.  WEAKNESS IN RIDGE (TROUGH) MAY ALLOW FOR ISOLATED STORMS
SOUTH DURING THE EARLY PART OF THE WEEKEND...BUT OVERALL THINGS
SHOULD REMAIN DRY THURSDAY INTO THE EARLY PART OF NEXT WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  90  71  94  74 /  50  30  10  10
HOBART OK         93  72  97  74 /  30  20  10  10
WICHITA FALLS TX  93  73  98  75 /  40  20  10  10
GAGE OK           91  68  96  70 /  40  20  10  10
PONCA CITY OK     88  71  93  74 /  30  50  10  10
DURANT OK         90  73  92  75 /  50  20  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.

&&

6

Hazardous weather outlook, Jul 6, 12:05 PM CDT, 18 hours before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1205 PM CDT TUE JUL 6 2004

OKZ004>048-050>052-TXZ083>090-071200-

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
TONIGHT ACROSS MUCH OF CENTRAL AND SOUTHERN OKLAHOMA AND ALL OF
WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA IS SOUTH OF A LINE FROM ERICK TO GEARY TO
CHANDLER.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 5 PM
THROUGH OVERNIGHT.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREAS SHOULD BE PREPARED FOR ADDITIONAL SEVERE WEATHER
OPERATIONS THIS EVENING AND OVERNIGHT TONIGHT.

DISCUSSION...
AN OUTFLOW BOUNDARY GENERATED FROM THUNDERSTORMS OVERNIGHT AND THIS
MORNING HAS BECOME NEARLY STATIONARY ACROSS NORTH TEXAS... FROM NEAR
FORT WORTH... NORTHWESTWARD TO NEAR KNOX COUNTY TEXAS... TO BETWEEN
LUBBOCK AND AMARILLO.  IN ADDITION... A COLD FRONT LOCATED ACROSS
THE NORTHERN TEXAS PANHANDLE INTO NORTHWEST OKLAHOMA AT MIDDAY...
WILL MOVE SLOWLY SOUTHEAST TO NEAR INTERSTATE 44 BY EARLY THIS
EVENING. CLOUD COVER FROM MORNING THUNDERSTORMS HAS RAPIDLY
THINNED ACROSS WESTERN AND NORTHERN OKLAHOMA... AND WESTERN NORTH
TEXAS... AND THIS WILL ALLOW THE AIRMASS TO RAPIDLY DESTABILIZE
DURING THE AFTERNOON.  RAPID REDEVELOPMENT OF THUNDERSTORMS IS
EXPECTED THIS AFTERNOON AND EVENING FROM SOUTHEAST COLORADO AND
NORTHEAST NEW MEXICO INTO THE TEXAS PANHANDLE WHERE SURFACE
CONVERGENCE AND INSTABILITY WILL BE MAXIMIZED... AND ISOLATED STORMS
MAY ALSO REDEVELOP OVER PARTS OF SOUTHWEST OKLAHOMA AND WESTERN
NORTH TEXAS NEAR THE FRONT AND OUTFLOW BOUNDARY.

STORMS DEVELOPING FARTHER WEST ARE EXPECTED TO ORGANIZE INTO ANOTHER
COMPLEX AND MOVE SOUTHEASTWARD OVERNIGHT... AFFECTING SOUTHERN
OKLAHOMA AND WESTERN NORTH TEXAS... WITH THE MOST WIDESPREAD
COVERAGE ACROSS THE SOUTHWEST THIRD OF OKLAHOMA AND WESTERN NORTH
TEXAS. THE TORNADO THREAT IS EXCEPTIONALLY LOW AGAIN TODAY... WITH
THE PRIMARY SEVERE WEATHER THREAT BEING LARGE HAIL THIS AFTERNOON
AND EVENING... AND DAMAGING WINDS WITH THE COMPLEX OF STORMS
OVERNIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY JUL 7.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

THUNDERSTORM OUTLOOK...
ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN WEDNESDAY AS THE
FRONT STALLS AND BEGINS TO RETREAT NORTHWARD.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
WEDNESDAY.

 MILLER

In the hours before

Local storm report, Jul 7, 3:28 AM CDT, 2 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
328 AM CDT WED JUL 07 2004

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

0122 AM     HAIL             7 N REED                35.00N 99.68W
07/07/2004  1.75 INCH        GREER              OK   EMERGENCY MNGR

0110 AM     HAIL             2 S BLAIR               34.75N 99.33W
07/07/2004  0.88 INCH        JACKSON            OK   AMATEUR RADIO

0150 AM     HAIL             4 NE ALTUS              34.68N 99.28W
07/07/2004  1.00 INCH        JACKSON            OK   AMATEUR RADIO

0158 AM     HAIL             1 W ALTUS               34.64N 99.35W
07/07/2004  0.88 INCH        JACKSON            OK   AMATEUR RADIO

&&

FM

Local storm report, Jul 7, 3:39 AM CDT, 2 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
339 AM CDT WED JUL 07 2004

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

0200 AM     TSTM WND GST     3 S ALTUS               34.59N 99.33W
07/07/2004  59 MPH           JACKSON            OK   MESONET

0205 AM     TSTM WND GST     3 S ALTUS               34.59N 99.33W
07/07/2004  60 MPH           JACKSON            OK   MESONET

0220 AM     TSTM WND GST     3 S ALTUS               34.59N 99.33W
07/07/2004  62 MPH           JACKSON            OK   MESONET

0237 AM     HAIL             NOBLE                   35.14N 97.39W
07/07/2004  1.00 INCH        CLEVELAND          OK   TRAINED SPOTTER

0254 AM     TSTM WND GST     5 N VERNON              34.22N 99.28W
07/07/2004  62 MPH           WILBARGER          TX   AMATEUR RADIO

0257 AM     TSTM WND GST     5 N VERNON              34.22N 99.28W
07/07/2004  72 MPH           WILBARGER          TX   AMATEUR RADIO

0308 AM     HAIL             2 E MIDDLEBERG          35.10N 97.71W
07/07/2004  1.25 INCH        GRADY              OK   NWS EMPLOYEE

0315 AM     HAIL             2 SSW BLANCHARD         35.12N 97.67W
07/07/2004  1.00 INCH        MCCLAIN            OK   CO-OP OBSERVER

0331 AM     HAIL             2 SSW BLANCHARD         35.12N 97.67W
07/07/2004  1.25 INCH        MCCLAIN            OK   AMATEUR RADIO

&&

FM

Special weather statement, Jul 7, 4:37 AM CDT, 1 hour 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
437 AM CDT WED JUL 7 2004

OKZ031-071000-
SEMINOLE OK-
437 AM CDT WED JUL 7 2004

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR SEMINOLE COUNTY.

A STRONG THUNDERSTORM WAS LOCATED 7 MILES WEST OF LITTLE AT 437 AM
CDT...MOVING EAST AT 10 MPH. SMALL HAIL AND HEAVY RAIN ARE LIKELY
WITH THIS STORM AS IT MOVES EAST ACROSS NORTHERN SEMINOLE COUNTY.

CJS

Special weather statement, Jul 7, 4:39 AM CDT, 1 hour 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
439 AM CDT WED JUL 7 2004

OKZ032-071000-
HUGHES OK-
439 AM CDT WED JUL 7 2004

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HUGHES COUNTY.

STRONG THUNDERSTORMS WERE LOCATED ACROSS FAR NORTHERN HUGHES
COUNTY... MOVING EAST AT 10 MPH. HAIL TO NEAR THE SIZE OF DIMES AND
HEAVY RAIN ARE LIKELY WITH THE STORMS.

CJS

Local storm report, Jul 7, 4:45 AM CDT, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
445 AM CDT WED JUL 07 2004

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

0422 AM     TSTM WND GST     5 N WICHITA FALLS       33.99N 98.50W
07/07/2004  59 MPH           WICHITA            TX   OFFICIAL NWS OBS

&&

FM

Local storm report, Jul 7, 5:23 AM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
523 AM CDT WED JUL 07 2004

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

0515 AM     HAIL             HENRIETTA               33.82N 98.19W
07/07/2004  0.75 INCH        CLAY               TX   AMATEUR RADIO

&&

FM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 12:04 AM CDT	Severe Thunderstorm Warning	OUN	Washita	41 min
Jul 7, 12:10 AM CDT	Severe Thunderstorm Warning	OUN	Greer	50 min
Jul 7, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa	60 min
Jul 7, 12:36 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	54 min
Jul 7, 12:59 AM CDT	Severe Thunderstorm Warning	OUN	Greer	61 min
Jul 7, 1:03 AM CDT	Severe Thunderstorm Warning	OUN	Caddo	57 min
Jul 7, 1:28 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	62 min
Jul 7, 1:45 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa	45 min
Jul 7, 1:57 AM CDT	Severe Thunderstorm Warning	OUN	Greer	63 min
Jul 7, 1:59 AM CDT	Severe Thunderstorm Warning	OUN	Caddo	61 min
Jul 7, 2:04 AM CDT	Severe Thunderstorm Warning	OUN	Grady	56 min
Jul 7, 2:22 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	53 min
Jul 7, 2:26 AM CDT	Severe Thunderstorm Warning	OUN	Beckham	64 min
Jul 7, 2:33 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	42 min
Jul 7, 2:36 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	54 min
Jul 7, 2:58 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	62 min
Jul 7, 3:09 AM CDT	Severe Thunderstorm Warning	OUN	Canadian	51 min
Jul 7, 3:16 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	59 min
Jul 7, 3:25 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	65 min
Jul 7, 3:28 AM CDT	Severe Thunderstorm Warning	OUN	McClain	62 min
Jul 7, 3:44 AM CDT	Severe Thunderstorm Warning	OUN	Washita	61 min
Jul 7, 3:45 AM CDT	Severe Thunderstorm Warning	OUN	Cotton	45 min
Jul 7, 3:57 AM CDT	Severe Thunderstorm Warning	OUN	Grady	63 min
Jul 7, 4:14 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland	46 min
Jul 7, 4:28 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson	62 min
Jul 7, 4:50 AM CDT	Severe Thunderstorm Warning	OUN	Seminole	40 min
Jul 7, 5:29 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson	46 min
Jul 7, 5:55 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	50 min
Jul 7, 6:44 AM CDT	Severe Thunderstorm Warning	OUN	Johnston	46 min
Jul 7, 7:21 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	54 min
Jul 6, 11:56 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	64 min
Jul 7, 3:37 AM CDT	Severe Thunderstorm Warning	OUN	Wichita	38 min
Jul 7, 4:11 AM CDT	Severe Thunderstorm Warning	OUN	Wichita	64 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.