Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 642, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 30, 2004, 4:46 AM CDT for Harper County, Oklahoma. It was in force for 44 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
- Aug 30, 2004, 4:46 AM CDT (09:46 UTC)
- Expired
- Aug 30, 2004, 5:30 AM CDT
- In force
- 44 min
- Issued by
- NWS Norman, OK
- Area
- Counties, with a storm outline in the text
County Harper County, OK
The radar
The Dodge City radar (KDDC), 111 km from the middle of the area, began a volume at 09:46 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
Dodge City, (KDDC), launched 00:00Z, 9.8 hours before the alert went out and 111 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.
- Mixed-layer CAPE
- 913 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 1956 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
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 Aug 30, 3:41 AM CDT, 1 hour 5 minutes earlier.
Area forecast discussion, Aug 30, 3:41 AM CDT, 1 hour 5 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 341 AM CDT MON AUG 30 2004 .DISCUSSION... SCATTERED TSRA CONTINUE TO DEVELOP OVER KANSAS AND NORTHWEST OKLAHOMA IN ASSOCIATION WITH THE LOW LEVEL JET AND PASSAGE OF SHORTWAVE TROUGH. NEARBY WEAK COLD FRONT OVER NORTHWEST KANSAS WILL SHIFT SLIGHTLY EASTWARD THIS AFTERNOON AS THE TROUGH MOVES THROUGH THE GREAT LAKES...BEFORE SLOWLY WEAKENING. THANKS IN PART TO A RELATIVELY MOIST GROUND...MODELS CONTINUE TO HAVE DIFFICULTY HANDING MOISTURE TRANSPORT FROM THE GROUND...WITH EVEN 06 HR 2M DEWPOINT PROGS FROM ETA/GFS AVERAGING 4-10 DEGREES F TOO LOW. ACCOUNTING FOR THE LIKELIHOOD OF THIS TREND CONTINUING TODAY...MODERATE INSTABILITY IS EXPECTED TO REFORM AHEAD OF THE COLD FRONT BY LATE AFTERNOON WITH CONVECTIVE INHIBITION LOW. ALTHOUGH WE EXPECT SCATTERED TSRA TO FORM ALONG THE FRONT BY THIS TIME...AREAL COVERAGE SHOULD BE MUCH LESS HOWEVER COMPARED TO SUNDAY AS THE MID/UPPER RIDGE BUILDS SLOWLY OVER THE AREA. PRECIP CHANCES ARE WORTH MENTIONING FOR THE NORTHERN ONE THIRD OF THE FORECAST AREA FOR LATE AFTERNOON/TONIGHT. BY WEDNESDAY...THE SYNOPTIC PATTERN CONTINUES TO SHIFT TOWARD A LESS FAVORABLE PATTERN FOR RAIN...WITH GREAT LAKES TROUGH RETREATING... AND NEXT UPPER TROUGH ENTERING WESTERN US. WITH SURFACE RIDGE EXPECTED TO PREVAIL OVER THE WESTERN GULF FOR AT LEAST ANOTHER FEW DAYS...DEEPER MOISTURE RETURN WILL BE UNAVAILABLE...SUPPORTING RELATIVELY COOL NIGHTS WITH SKIES PC/MOSTLY CLEAR. BUT BY THE END OF THE WEEK...THE MEDIUM RANGE MODELS ARE IS REASONABLE AGREEMENT IN ALLOWING LONGWAVE TROUGH TO MOVE THROUGH THE ROCKIES WITH ASSOCIATED WEAK COLD FRONT POSSIBLY ENTERING NORTHWEST OKLAHOMA BY LATE FRIDAY/SATURDAY. EVEN IF DEEPER MOISTURE DOES NOT RETURN TO THE AREA BY THIS TIME...LIFT ASSOCIATED WITH COLD FRONT AND TROUGH MAY BE SUFFICIENT TO OVERCOME NEGATING AFFECTS OF LESS MOISTURE...AT LEAST ENOUGH TO WARRANT LOW POPS. && .PRELIMINARY POINT TEMPS/POPS... OKLAHOMA CITY OK 87 64 88 65 / 10 0 0 10 HOBART OK 90 65 90 66 / 10 10 0 10 WICHITA FALLS TX 89 65 89 67 / 10 0 0 10 GAGE OK 89 65 90 63 / 30 30 10 10 PONCA CITY OK 86 62 89 65 / 10 20 0 10 DURANT OK 88 64 88 66 / 10 0 0 10 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...NONE. TX...NONE. && JAMES
Hazardous weather outlook, Aug 29, 11:59 AM CDT, 16 hours 47 minutes before
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 7:15 AM CDT | Flash Flood Warning | OUN | Harper | 3 hr |
| Aug 30, 9:39 AM CDT | Severe Thunderstorm Warning | OUN | Beckham | 51 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2004Every 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.