Alert archive / Oklahoma / Special Weather Statements in 2021
Special Weather Statement, NWS Norman, OK
NWS Norman, OK issued this special weather statement at May 11, 2021, 9:44 AM CDT for Cleveland County, Oklahoma. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 11, 2021, 9:44 AM CDT (14:44 UTC)
- Expired
- May 11, 2021, 10:15 AM CDT
- In force
- 31 min
- Issued by
- NWS Norman, OK
County Cleveland County, OK
The radar
The Norman radar (KTLX), 32 km from the middle of the area, began a volume at 14:47 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 12:00Z, 2.7 hours before the alert went out and 16 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 552 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at May 11, 5:59 AM CDT, 3 hours 45 minutes earlier.
Area forecast discussion, May 11, 5:59 AM CDT, 3 hours 45 minutes before
Area Forecast Discussion National Weather Service Norman OK 559 AM CDT Tue May 11 2021 ...New AVIATION... .SHORT TERM... (Today and tonight) Issued at 216 AM CDT Tue May 11 2021 Early this morning, isentropic ascent atop low 50s dewpoints could foster some isolated strong to severe thunderstorms across the area. An approaching mid-level perturbation should allow for lapse rates to steepen and support some elevated instability. Some high resolution models seem to show little-to-no initiation at all, but that is likely due to the weaker moisture advection beneath the isentropic ascent. Southern OK, at the very least, still has the best threat for marginally severe hail accompanying any deeper convection. The threat for convection does, however, have the possibility to reach the I-40 corridor and vicinity if surface moisture can increase. Models are in agreement with modest effective shear that could support organized cells, should they form. Any storms that do form, will tend to be isolated. During the day, cloudy skies and rain showers with ENE surface flow will keep temperatures across the area in the mid-to-upper 50s. Rain showers should taper off some this evening with low temperatures in the mid 40s to low 50s across much of the area. Bunker && .LONG TERM... (Wednesday through Monday) Issued at 216 AM CDT Tue May 11 2021 A low amplitude wave will make its way through the area on Wednesday, with low precipitation chances until it moves out of the area Wednesday evening. Northwest flow aloft will be overhead through most of the area through the remainder of the week, until a broad ridge sets in later this weekend. There is the chance that some residual convection, emanating from the Central/High Plains, moves into the area late on Friday into Saturday morning. Temperatures will gradually increase to near normal temperatures over the weekend with highs in the low 80s. Model guidance suggests that a negatively tilted mid-level trough could bring the chance for more organized convection across the area on Monday. There is model discrepancy on the initiating boundary currently and shear looks to be weaker, but the main point here is that an active pattern could exist next week. Confidence in potential and timing will be better later this week and into the weekend. Bunker && .AVIATION... (12Z TAFS) Issued at 543 AM CDT Tue May 11 2021 Ceilings will lower quickly this morning from VFR/MVFR to IFR with possibly some LIFR later this morning. Sfc visibility will also lower to mainly 3-5 mile range, but could see some lower vis within the shower/thunderstorm activity that is expected to become widespread later this morning. Precip chances will diminish from west to east during the afternoon and early evening hours. However IFR conditions will likely continue through 12Z Wednesday at most sites. && .UPPER AIR... Issued at 108 PM CDT Mon May 10 2021 An Upper Air flight is planned for 12z this morning. && .PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 57 48 61 47 / 100 20 20 10 Hobart OK 56 47 62 47 / 90 20 40 10 Wichita Falls TX 61 51 63 49 / 90 30 30 10 Gage OK 54 42 61 43 / 60 10 20 10 Ponca City OK 60 47 63 44 / 70 20 10 10 Durant OK 61 53 65 50 / 90 50 20 10 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. && SHORT TERM...13 LONG TERM....13 AVIATION...30
Hazardous weather outlook, May 11, 8:02 AM CDT, 1 hour 42 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 802 AM CDT Tue May 11 2021 OKZ004>048-050>052-TXZ083>090-121315- Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield- Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne- Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain- Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson- Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton- Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman- Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay- 802 AM CDT Tue May 11 2021 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Today and Tonight... .Thunderstorms... Thunderstorms will be possible this morning thru early this afternoon mainly along and south of Interstate 40. A few strong to severe thunderstorms will be possible across portions of western north Texas and southern Oklahoma thru 100 PM, with hail up to the size of half dollars and wind gusts exceeding 50 mph. Although showers will continue into the evening, thunderstorm chances will diminish across the area by late this afternoon. .DAYS TWO THROUGH SEVEN...Wednesday through Monday... .Thunderstorms... Thunderstorm chances return to parts of Oklahoma and western north Texas Friday night and continue through Monday. A few strong to severe storms appear possible. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook.
In the hours before
Special weather statement, May 11, 8:31 AM CDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
831 AM CDT Tue May 11 2021
OKZ022-023-035-111415-
Kiowa OK-Washita OK-Caddo OK-
831 AM CDT Tue May 11 2021
...SIGNIFICANT WEATHER ADVISORY FOR northeastern Kiowa...southeastern
Washita and southern Caddo Counties Until 915 AM CDT...
AT 826 AM CDT, a strong thunderstorm was located near Mountain View,
moving east at 45 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...
Locations impacted include...
Anadarko, Carnegie, Mountain View, Fort Cobb, Gracemont, Gotebo, Fort
Cobb Reservoir and Albert.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3496 9883 3506 9891 3513 9888 3531 9830
3503 9821
TIME...MOT...LOC 1326Z 257DEG 38KT 3506 9877
03Special weather statement, May 11, 8:37 AM CDT, 1 hour 7 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 837 AM CDT Tue May 11 2021 TXZ086-089-090-111415- Clay TX-Wichita TX-Archer TX- 837 AM CDT Tue May 11 2021 ...SIGNIFICANT WEATHER ADVISORY FOR central Clay...southeastern Wichita and northeastern Archer Counties Until 915 AM CDT... AT 835 AM CDT, a strong thunderstorm was located 6 miles northwest of Lake Arrowhead, moving northeast at 35 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts to 50 MPH... Minor flooding in areas of poor drainage... Heavy rain can lead to reduced visibility... Frequent cloud to ground lightning... Locations impacted include... Southeastern Wichita Falls, Henrietta, Petrolia, Scotland, Byers, Dean, Jolly, Lake Arrowhead and Lakeside City. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3366 9847 3380 9858 3411 9819 3386 9799 TIME...MOT...LOC 1335Z 235DEG 30KT 3377 9845 03
Special weather statement, May 11, 8:47 AM CDT, 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 847 AM CDT Tue May 11 2021 OKZ021-022-034-035-111430- Kiowa OK-Washita OK-Beckham OK-Greer OK- 847 AM CDT Tue May 11 2021 ...SIGNIFICANT WEATHER ADVISORY FOR northwestern Kiowa...western Washita...southeastern Beckham and northern Greer Counties Until 930 AM CDT... AT 845 AM CDT, a strong thunderstorm was located 6 miles south of Delhi, moving east at 50 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts to 50 MPH... Heavy rain can lead to reduced visibility... Frequent cloud to ground lightning... Locations impacted include... Burns Flat, Sentinel, Dill City, Carter, Rocky, Willow, Retrop, Delhi and Brinkman. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3497 9973 3513 9980 3544 9916 3508 9901 TIME...MOT...LOC 1345Z 247DEG 43KT 3508 9967 03
Special weather statement, May 11, 9:05 AM CDT, 39 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
905 AM CDT Tue May 11 2021
OKZ045-TXZ090-111445-
Jefferson OK-Clay TX-
905 AM CDT Tue May 11 2021
...SIGNIFICANT WEATHER ADVISORY FOR southeastern Jefferson and east
central Clay Counties Until 945 AM CDT...
AT 903 AM CDT, a strong thunderstorm was located 4 miles southeast of
Henrietta, moving east at 50 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...
Locations impacted include...
Henrietta, Terral, Grady, Oscar and Petersburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3381 9827 3416 9756 3390 9756 3390 9759
3392 9760 3395 9759 3398 9764 3399 9768
3394 9773 3394 9776 3391 9776 3392 9778
3389 9779 3389 9780 3386 9783 3385 9787
3389 9798 3368 9798 3364 9819
TIME...MOT...LOC 1403Z 247DEG 43KT 3376 9814
03Special weather statement, May 11, 9:25 AM CDT, 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 925 AM CDT Tue May 11 2021 OKZ025-111515- Oklahoma OK- 925 AM CDT Tue May 11 2021 ...SIGNIFICANT WEATHER ADVISORY FOR southern Oklahoma County Until 1015 AM CDT... AT 924 AM CDT, a strong thunderstorm was located over western Oklahoma City, moving east at 35 MPH. HAZARDS INCLUDE... Hail up to the size of dimes... Wind gusts to 40 MPH... Heavy rain can lead to reduced visibility... Frequent cloud to ground lightning... Locations impacted include... Oklahoma City, Midwest City, Del City, Bethany, Choctaw, Warr Acres, Harrah, Spencer, Nichols Hills, Jones, Nicoma Park, Tinker Air Force Base, Forest Park, Woodlawn Park, Lake Aluma, Smith Village, The Capitol and The Fairgrounds. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3541 9767 3552 9767 3566 9715 3541 9714 TIME...MOT...LOC 1424Z 261DEG 31KT 3547 9755 03
Special weather statement, May 11, 9:44 AM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 944 AM CDT Tue May 11 2021 OKZ028-029-111515- Cleveland OK-McClain OK- 944 AM CDT Tue May 11 2021 ...SIGNIFICANT WEATHER ADVISORY FOR central Cleveland and west central McClain Counties Until 1015 AM CDT... AT 943 AM CDT, a strong thunderstorm was located near Washington, moving northeast at 40 MPH. HAZARDS INCLUDE... Hail up to the size of dimes... Wind gusts to 40 MPH... Heavy rain can lead to reduced visibility... Frequent cloud to ground lightning... Locations impacted include... Norman, Purcell, Noble, Slaughterville, Goldsby, Dibble, Washington, Cole, Criner and southwestern Lake Thunderbird. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3497 9757 3505 9765 3531 9734 3513 9719 TIME...MOT...LOC 1443Z 232DEG 34KT 3505 9754 03
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:30 PM CDT | Special Weather Statement | OUN | Bryan | 30 min |
| May 10, 7:36 PM CDT | Severe Thunderstorm Warning | OUN | Bryan | 24 min |
| May 10, 8:55 PM CDT | Special Weather Statement | OUN | Choctaw | 20 min |
| May 11, 8:15 AM CDT | Special Weather Statement | OUN | Kingfisher | 45 min |
| May 11, 8:30 AM CDT | Special Weather Statement | OUN | Comanche | 45 min |
| May 11, 8:31 AM CDT | Special Weather Statement | OUN | Caddo | 44 min |
| May 11, 8:42 AM CDT | Severe Thunderstorm Warning | OUN | Comanche | 16 min |
| May 11, 8:47 AM CDT | Special Weather Statement | OUN | Beckham | 43 min |
| May 11, 9:25 AM CDT | Special Weather Statement | OUN | Oklahoma | 50 min |
| May 11, 9:46 AM CDT | Special Weather Statement | OUN | Carter, Jefferson, Love | 44 min |
| May 11, 9:54 AM CDT | Areal Flood Advisory | OUN | Canadian, Cleveland, Grady, McClain, Oklahoma | 3 hr |
| May 11, 10:06 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Johnston, Love, Marshall | 39 min |
| May 11, 10:09 AM CDT | Special Weather Statement | OUN | Cleveland, McClain | 36 min |
| May 11, 10:44 AM CDT | Special Weather Statement | OUN | Pontotoc, Pottawatomie, Seminole | 46 min |
| May 11, 10:45 AM CDT | Special Weather Statement | OUN | Marshall | 45 min |
| May 11, 11:14 AM CDT | Special Weather Statement | OUN | Coal, Hughes, Pontotoc, Seminole | 46 min |
| May 11, 7:19 AM CDT | Special Weather Statement | OUN | Hardeman | 26 min |
| May 11, 7:52 AM CDT | Special Weather Statement | OUN | Baylor, Knox | 38 min |
| May 11, 8:13 AM CDT | Special Weather Statement | OUN | Archer | 62 min |
| May 11, 8:37 AM CDT | Special Weather Statement | OUN | Clay | 38 min |
| May 11, 9:05 AM CDT | Special Weather Statement | OUN | Clay | 40 min |
Nearby
Special Weather Statements in Oklahoma, 2021Every special weather statement in 2021
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.