Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2005
Severe Thunderstorm Warning 53, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Apr 20, 2005, 7:08 PM CDT for Greer County, Harmon County, Jackson County, Oklahoma. It was in force for 52 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
- Apr 20, 2005, 7:08 PM CDT (00:08 UTC)
- Expired
- Apr 20, 2005, 8:00 PM CDT
- In force
- 52 min
- Issued by
- NWS Norman, OK
- Area
- Counties, with a storm outline in the text
Counties Greer County, OK, Harmon County, OK, Jackson County, OK
The radar
The Altus AFB radar (KFDR), 72 km from the middle of the area, began a volume at 00:09 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 20, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 00:00Z, 0.1 hours before the alert went out and 198 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
- 81 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 3303 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Apr 20, 1:49 PM CDT, 5 hours 19 minutes earlier.
Area forecast discussion, Apr 20, 1:49 PM CDT, 5 hours 19 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 149 PM CDT WED APR 20 2005 .DISCUSSION...DRYLINE EXTENDS FROM CENTRAL KS SSWWD INTO FAR NW OK..AND THEN SWD ACROSS THE ERN TX PANHANDLE TO NEAR SNYDER. LOW LEVEL MOISTURE IS PERHAPS A BIT BETTER THAN YDAY..BUT OVERALL CAPE/SHEAR PROFILES ARE PRETTY SIMILAR TO YDAY. PERHAPS ONE IMPORTANT DIFFERENCE APPEARS TO BE SUBTLE WAVE PROGRESSING NEWD FROM SW TEXAS AT THE LEADING EDGE OF DRY PLUME EVIDENT IN WV IMAGERY ACROSS NRN MEXICO INTO TX BIG BEND REGION. MULTIPLE CHANNEL WV IMAGERY SUGGESTS THAT WAVE AXIS IS SOMEWHERE FROM JUST NORTH OF LUBBOCK ARCING SEWD TO JUST EAST OF SAN ANGELO..MOVING NEWD AT 15- 20 MPH. ASCENT WITHIN AREA JUST IN ADVANCE OF WAVE HAS SUPPORTED WEAK ELEVATED CONVECTION OVER CENT/WRN TEXAS MUCH OF THE MORNING. IT LOOKS TO BE A CLOSE CALL ON TIMING..AS WAVE MAY MOVE TOO FAR EWD TO SUPPORT DRYLINE STORMS. BUT..IF LIFT CAN BECOME SUPERIMPOSED NEAR DRYLINE..AS CURRENT VIZ SAT IMAGES SUGGEST IT MIGHT..STORM INITIATION AND/OR ONGOING ELEVATED CONVECTION TAPPING INTO BOUNDARY LAYER INSTABILITY APPEARS FAIRLY DECECNT. GIVEN CAPE/SHEAR PROFILES..SUPERCELLS WITH VERY LARGE HAIL APPEAR LIKELY..ON CONDITION OF INITIATION. DRYLINE WILL RETREAT WWD THIS EVENING..BUT SHUD BE ON THE MOVE EWD FAIRLY RAPIDLY THUR MORNING..WITH COLD FRONT OVERTAKING THE DRYLINE FROM N TO S DURING THE DAY. IT SEEMS THAT STORMS MAY DEVELOP EARLY/MID AFTERNOON ALONG OR JUST SOUTHEAST OF I44..WITH BEST CHANCES OVER SCENT/SE OK 3-10 PM THUR EVENING. SECONDARY COLD FRONT WILL THEN SWEEP SEWD THUR NITE/FRI MORNING..WITH A WINDY BUT MILD DAY FRIDAY. WE MAY NEED TO HOIST A FIRE WEATHER WATCH FOR MUCH OF WRN OK FOR FRI AFTERNOON IN LATER ISSUANCES. RIDGE AXIS SETTLING OVER THE SRN PLAINS SAT/SUN SHUD BRING VERY NICE SPRING WEATHER WITH COOL/COLD NIGHTS AND PLEASANT AFTERNOON TEMPS IN THE 60S TO LOWER 70S. WINDS SHUD ALSO BE LIGHT MUCH OF THE WEEKEND..AT LEAST BY APRIL STANDARDS..UNTIL SRLY RETURN FLOW DEVELOPS WEST ON SUNDAY. NEXT CHANCE OF RAIN BEGINS LATE SUN INTO TUE WITH NEXT WAVE..BUT MOISTURE WILL BE A PROBLEM AS SOUTH WINDS SUN/MON WILL YET AGAIN HAVE TRAJECTORIES ORIGINATING IN THE POST FRONTAL COOL SFC RIDGE OVER THE NRN/WRN GULF. UNTIL WE GET A PATTERN CHANGE THAT REMOVES THE PRESENCE OF THE MEAN ERN CONUS TROF AND SUBSEQUENT PERSISTENT LOW LEVEL RIDGING IN THE NRN GULF OF MEXICO..CHANCES OF GETTING A TRULY TROPICAL BOUNDARY LAYER AIRMASS INTO NTEX/OK APPEAR SLIM TO NONE. MILLER && .PRELIMINARY POINT TEMPS/POPS... OKLAHOMA CITY OK 65 84 52 74 / 20 30 10 10 HOBART OK 63 86 51 75 / 30 20 10 10 WICHITA FALLS TX 65 90 58 78 / 30 30 10 10 GAGE OK 56 80 45 70 / 30 10 10 10 PONCA CITY OK 65 82 49 70 / 20 30 10 10 DURANT OK 65 84 61 80 / 20 40 50 20 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...NONE. TX...NONE. &&
Hazardous weather outlook, Apr 20, 6:35 PM CDT, 33 minutes before
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Special weather statement, Apr 20, 6:07 PM CDT, 1 hour 1 minute before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 607 PM CDT WED APR 20 2005 OKZ021-033-034-202330- BECKHAM OK-GREER OK-HARMON OK- 607 PM CDT WED APR 20 2005 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...GREER AND HARMON COUNTIES. AT 607 PM CDT... A CLUSTER OF STRONG TO SEVERE THUNDERSTORMS WAS RAPIDLY DEVELOPING BETWEEN SHAMROCK AND CHILDRESS TEXAS... MOVING NORTHEAST AT 30 MPH. THESE STORMS WILL LIKELY MOVE INTO WESTERN OKLAHOMA AND PRODUCE SEVERE WEATHER BY 7 PM. PEOPLE IN BECKHAM...GREER AND HARMON COUNTIES SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS. MILLER
Local storm report, Apr 20, 6:38 PM CDT, 30 minutes before
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</html>Special weather statement, Apr 20, 6:42 PM CDT, 26 minutes before
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</html>Local storm report, Apr 20, 6:44 PM CDT, 24 minutes before
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</html>Local storm report, Apr 20, 6:49 PM CDT, 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
649 PM CDT WED APR 20 2005
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0648 PM HAIL 4 NNW MCKNIGHT 34.82N 99.95W
04/20/2005 0.75 INCH HARMON OK PUBLIC
&&
JLPLocal storm report, Apr 20, 7:06 PM CDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
706 PM CDT WED APR 20 2005
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 PM TSTM WND DMG HOLLIS 34.69N 99.92W
04/20/2005 HARMON OK LAW ENFORCEMENT
POWERLINES DOWN IN TOWN
&&
JLPThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 7:12 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 48 min |
| Apr 20, 7:41 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 64 min |
| Apr 20, 7:48 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Dewey, Washita | 57 min |
| Apr 20, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Jackson, Kiowa | 46 min |
| Apr 20, 8:00 PM CDT | Severe Thunderstorm Warning | OUN | Harmon | 45 min |
| Apr 20, 8:43 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 47 min |
| Apr 20, 8:45 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Washita | 30 min |
| Apr 20, 8:51 PM CDT | Flash Flood Warning | OUN | Harmon, Jackson | 3 hr |
| Apr 20, 9:16 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Kiowa | 44 min |
| Apr 20, 9:21 PM CDT | Severe Thunderstorm Warning | OUN | Harmon | 39 min |
| Apr 20, 9:27 PM CDT | Severe Thunderstorm Warning | OUN | Tillman | 33 min |
| Apr 20, 9:55 PM CDT | Severe Thunderstorm Warning | OUN | Harmon, Jackson | 65 min |
| Apr 20, 10:03 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 42 min |
| Apr 20, 10:43 PM CDT | Severe Thunderstorm Warning | OUN | Grant | 47 min |
| Apr 21, 12:23 AM CDT | Severe Thunderstorm Warning | OUN | Cotton, Jefferson | 52 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.