Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 648, NWS Norman, OK

October 21, 2007Logan County, Noble County, Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 21, 2007, 10:14 PM CDT for Logan County, Noble County, Payne County, Oklahoma. It was in force for 46 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
Oct 21, 2007, 10:14 PM CDT (03:14 UTC)
Expired
Oct 21, 2007, 11:00 PM CDT
In force
46 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Logan County, OK, Noble County, OK, Payne County, OK

The radar

The Norman radar (KTLX), 89 km from the middle of the area, began a volume at 03:15 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

Lamont, OK (KLMN), launched 00:00Z, 3.2 hours before the alert went out and 60 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, Lamont, OK at 00:00Z on 2007-10-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lamont, OK at 00:00Z on 2007-10-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -67 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1120 m above ground
0-6 km bulk shear
95 kt
0-1 km storm-relative helicity
-67 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Oct 21, 8:32 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Oct 21, 8:32 PM CDT, 1 hour 42 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
832 PM CDT SUN OCT 21 2007

.UPDATE...
ELEVATED CONVECTION INCREASING RAPIDLY IN RESPONSE TO DEEPENING
TROF AIDED BY FRONTOGENETIC FORCING N OF STRONG COLD FRONT. 00Z
OUN SOUNDING SHOWS DECENT ELEVATED INSTABILITY... 1000-1500 J/KG
FOR PARCELS LIFTED FROM AROUND 850 MB. THIS ALONG WITH VERY STRONG
DEEP-LAYER SHEAR - UP TO 95 KT IN 0-6KM LAYER - WILL SUPPORT A GOOD
POTENTIAL FOR SMALL HAIL AND PERHAPS ISOLATED STORMS WITH
MARGINALLY SEVERE HAIL THIS EVENING. FURTHER INCREASE IN COVERAGE
EXPECTED THROUGH THE NIGHT PER MODEL QPFS... ALTHOUGH MODE MAY
TREND TOWARD LESS CONVECTION AND MORE STRATIFORM PRECIP LATE
TONIGHT INTO MONDAY. FORECAST/GRIDS HAVE CURRENT TRENDS REFLECTED
WELL. WE WILL ONLY MAKE SOME RELATIVELY SMALL ADJUSTMENTS AT THIS
TIME... TO ADD MENTION OF SMALL HAIL AND HEAVY RAIN IN THE CURRENT
ACTIVE CORRIDOR FROM LAWTON TO W/N OF OKC TO E OF ENID.

STRONGER WINDS BEGINNING TO APPEAR AT SFC ACROSS MAINLY SW
QUADRANT OF OK AS 40-50KT WINDS AT 1 KM AGL BEGIN TO MIX DOWN IN
STRONG POST-FRONTAL COLD ADVECTION. SEVERAL GUSTS 40-48 MPH BEING
SEEN ON OK MESONET AND FROM SEVERAL METARS. WIND ADVISORY
CONTINUES. 24

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  43  48  41  58 / 100  80  30  20
HOBART OK         43  50  40  62 /  90  60  20   0
WICHITA FALLS TX  44  51  41  62 /  80  60  20   0
GAGE OK           41  55  41  63 /  40  20  20   0
PONCA CITY OK     45  50  39  59 /  90  80  40  30
DURANT OK         52  52  44  59 /  70  70  40  20

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...WIND ADVISORY UNTIL 6 AM CDT MONDAY FOR OKZ012-016>019-021>025-
     027>029-033>041-044>046-050.

TX...WIND ADVISORY UNTIL 6 AM CDT MONDAY FOR TXZ083>090.

&&

22/24
Hazardous weather outlook, Oct 21, 9:28 PM CDT, 46 minutes before
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In the hours before

Local storm report, Oct 21, 9:17 PM CDT, 57 minutes before
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Local storm report, Oct 21, 9:29 PM CDT, 45 minutes before
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Local storm report, Oct 21, 9:44 PM CDT, 30 minutes before
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Local storm report, Oct 21, 9:49 PM CDT, 25 minutes before
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Special weather statement, Oct 21, 9:59 PM CDT, 15 minutes before
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Special weather statement, Oct 21, 10:02 PM CDT, 12 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Oct 21, 8:35 PM CDTSevere Thunderstorm WarningOUNCanadian25 min
Oct 21, 8:51 PM CDTSevere Thunderstorm WarningOUNCanadian, Logan, Oklahoma39 min
Oct 21, 9:21 PM CDTSevere Thunderstorm WarningOUNCaddo39 min
Oct 21, 9:21 PM CDTSevere Thunderstorm WarningOUNLogan, Noble, Payne39 min
Oct 21, 9:30 PM CDTSevere Thunderstorm WarningOUNKingfisher, Logan, Oklahoma30 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2007Every severe thunderstorm warning in 2007

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.