Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 474, NWS Norman, OK

July 4, 2005Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 4, 2005, 3:11 AM CDT for Pottawatomie County, Oklahoma. It was in force for 34 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 4, 2005, 3:11 AM CDT (08:11 UTC)
Expired
Jul 4, 2005, 3:45 AM CDT
In force
34 min
Issued by
NWS Norman, OK
Area
Counties, with a storm outline in the text

County Pottawatomie County, OK

The radar

The Norman radar (KTLX), 33 km from the middle of the area, began a volume at 08:12 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 watch it was issued in

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

IssuedProductOfficeLasted
Jul 3, 8:25 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 4, 2:15 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.2 hours before the alert went out and 41 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2005-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3838 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2005-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
3838 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1823 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
257 m²/s²
Significant tornado parameter
0.3
Supercell composite
8.6

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 3, 9:50 PM CDT, 5 hours 21 minutes earlier.

Area forecast discussion, Jul 3, 9:50 PM CDT, 5 hours 21 minutes before
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Hazardous weather outlook, Jul 3, 8:20 PM CDT, 6 hours 51 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
820 PM CDT SUN JUL 3 2005

OKZ004>048-050>052-TXZ083>090-041200-

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS MUCH OF
NORTHERN OKLAHOMA...AND A SLIGHT RISK ACROSS WESTERN NORTH TEXAS AND
MOST OF CENTRAL AND SOUTHWEST OKLAHOMA.

LOCATION...
THE MODERATE RISK AREA IS NORTH OF A LINE FROM CHEYENNE TO OKARCHE
TO CUSHING. SOUTH OF THE MODERATE RISK AREA... THE SLIGHT RISK AREA
COVERS LOCATIONS NORTHWEST OF A LINE FROM ARCHER CITY TO ARDMORE TO
COALGATE.

TIMING...
THE MOST LIKELY TIME FOR SEVERE STORMS WILL BE FROM 9 PM THROUGH 3
AM ACROSS THE MODERATE RISK AREA... AND AFTER MIDNIGHT FROM THE
INTERSTATE 40 AREA SOUTHWARD.

EXPECTED WEATHER AND IMPACTS...
THE PRIMARY SEVERE WEATHER THREATS WILL BE DESTRUCTIVE WIND GUSTS TO
80 MPH OR MORE...AND HAIL TO THE SIZE OF GOLF BALLS OR POSSIBLY
LARGER.

RECOMMENDED ACTIONS...
EMERGENCY MANAGEMENT AND STORM SPOTTER GROUPS ACROSS THE RISK AREAS
SHOULD REMAIN PREPARED FOR SEVERE WEATHER OPERATIONS OVERNIGHT. ALL
PERSONS WITH OUTDOOR PLANS THIS EVENING AND TONIGHT ARE STRONGLY
ENCOURAGED TO REMAIN ALERT FOR CHANGING WEATHER CONDITIONS ...AND TO
STAY AWARE OF THE LATEST WEATHER INFORMATION THROUGH THE EVENING AND
OVERNIGHT HOURS..

DISCUSSION...
THUNDERSTORMS WILL CONTINUE TO INCREASE THIS EVENING ALONG AND NEAR
A COLD FRONT ACROSS SOUTHERN KANSAS...AND ORGANIZE INTO A LINE OR
CLUSTER AS THEY MOVE SOUTH INTO OKLAHOMA. THE RESULTING STORM
COMPLEX WILL MOVE INTO NORTHERN OKLAHOMA BY MID TO LATE
EVENING...AND CONTINUE SOUTH AND SOUTHEAST ACROSS MUCH OF THE AREA
OVERNIGHT. A LOW LEVEL JET DEVELOPING OVER THE AREA WILL HELP TO
MAINTAIN THE THUNDERSTORMS THROUGHOUT THE NIGHT. VERY UNSTABLE
CONDITIONS WILL PERSIST OVER OKLAHOMA AND NORTH TEXAS THIS
EVENING...WITH CAPE VALUES LIKELY TO REMAIN IN THE 3000 TO 5000
RANGE. THIS LEVEL OF INSTABILITY...ALONG WITH STRENGTHENING VERTICAL
WIND SHEAR AS THE LOW LEVEL JET INCREASES...WILL RESULT IN THE
POSSIBILITY OF WIDESPREAD AND OR SIGNIFICANT SEVERE THUNDERSTORMS
OVERNIGHT. WIND GUSTS TO 80 MPH AND HAIL LARGER THAN GOLFBALLS WILL
BE POSSIBLE.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT MONDAY JULY 4.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...90 PERCENT.

OTHER HAZARDOUS WEATHER...
HEAVY RAINS ALSO COULD CAUSE LOCALIZED FLOODING IN SOME LOCATIONS...
ESPECIALLY IN LOW-LYING AREAS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS THAT DEVELOP OVERNIGHT WILL LIKELY BE ONGOING ACROSS
THE AREA MONDAY MORNING. A FEW OF THESE MAY STILL BE SEVERE WITH
STRONG WIND GUSTS BEING THE PRIMARY CONCERN.

THERE WILL BE AT LEAST A SLIGHT CHANCE OF THUNDERSTORMS EACH DAY
THROUGH THE REST OF THE WEEK... AS A SURFACE FRONT REMAINS NEAR
THE AREA AND A NORTHWEST FLOW PATTERN ALOFT PERSISTS OVER THE
PLAINS. IN THIS WEATHER PATTERN... THUNDERSTORM CHANCES WILL
GENERALLY WILL BE THE HIGHEST DURING THE LATE NIGHT AND MORNING
HOURS.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
MONDAY JULY 4.

24

In the hours before

Local storm report, Jul 4, 2:31 AM CDT, 40 minutes before
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Local storm report, Jul 4, 2:42 AM CDT, 29 minutes before
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Local storm report, Jul 4, 2:45 AM CDT, 26 minutes before
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Local storm report, Jul 4, 2:51 AM CDT, 20 minutes before
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Local storm report, Jul 4, 2:55 AM CDT, 16 minutes before
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Local storm report, Jul 4, 3:06 AM CDT, 5 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 8:42 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant63 min
Jul 3, 8:49 PM CDTSevere Thunderstorm WarningOUNKay56 min
Jul 3, 9:41 PM CDTSevere Thunderstorm WarningOUNGrant, Kay49 min
Jul 3, 10:08 PM CDTSevere Thunderstorm WarningOUNHarper, Woods52 min
Jul 3, 10:24 PM CDTSevere Thunderstorm WarningOUNKay51 min
Jul 3, 10:28 PM CDTSevere Thunderstorm WarningOUNGrant47 min
Jul 3, 10:57 PM CDTSevere Thunderstorm WarningOUNHarper, Woods, Woodward63 min
Jul 3, 11:12 PM CDTSevere Thunderstorm WarningOUNKay48 min
Jul 3, 11:16 PM CDTSevere Thunderstorm WarningOUNAlfalfa59 min
Jul 3, 11:33 PM CDTSevere Thunderstorm WarningOUNEllis42 min
Jul 3, 11:36 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Major54 min
Jul 4, 12:11 AM CDTSevere Thunderstorm WarningOUNKay64 min
Jul 4, 12:20 AM CDTSevere Thunderstorm WarningOUNBlaine, Dewey40 min
Jul 4, 12:21 AM CDTSevere Thunderstorm WarningOUNNoble54 min
Jul 4, 12:27 AM CDTSevere Thunderstorm WarningOUNGarfield, Major42 min
Jul 4, 12:45 AM CDTSevere Thunderstorm WarningOUNKingfisher, Logan, Payne60 min
Jul 4, 12:56 AM CDTSevere Thunderstorm WarningOUNCanadian, Lincoln, Oklahoma79 min
Jul 4, 1:00 AM CDTSevere Thunderstorm WarningOUNBlaine30 min
Jul 4, 1:48 AM CDTSevere Thunderstorm WarningOUNCleveland, Grady, McClain72 min
Jul 4, 2:11 AM CDTSevere Thunderstorm WarningOUNLincoln, Oklahoma, Pottawatomie64 min
Jul 4, 2:28 AM CDTSevere Thunderstorm WarningOUNSeminole62 min
Jul 4, 2:56 AM CDTSevere Thunderstorm WarningOUNCleveland28 min
Jul 4, 4:04 AM CDTSevere Thunderstorm WarningOUNBlaine26 min
Jul 4, 5:54 AM CDTSevere Thunderstorm WarningOUNCoal, Johnston, Pontotoc51 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2005Every severe thunderstorm warning in 2005

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.