Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

April 9, 2021Bryan County, Oklahoma

NWS Norman, OK issued this special weather statement at Apr 9, 2021, 10:32 AM CDT for Bryan County, Oklahoma. It was in force for 28 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: Apr 9, 2021, 10:32 AM CDT (15:32 UTC)
Expired: Apr 9, 2021, 11:00 AM CDT
In force: 28 min
Issued by: NWS Norman, OK

County Bryan County, OK

The radar

The Dallas/Ft Worth radar (KFWS), 183 km from the middle of the area, began a volume at 15:35 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

Fort Worth, TX (KFWD), launched 12:00Z, 3.5 hours before the alert went out and 160 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1461 J/kg
Mixed-layer CIN: -451 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 401 m²/s²
0-3 km storm-relative helicity: 399 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

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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 Apr 9, 6:24 AM CDT, 4 hours 8 minutes earlier.

Area forecast discussion, Apr 9, 6:24 AM CDT, 4 hours 8 minutes before

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Hazardous weather outlook, Apr 9, 4:42 AM CDT, 5 hours 50 minutes before

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In the hours before

Special weather statement, Apr 9, 10:21 AM CDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1021 AM CDT Fri Apr 9 2021

OKZ048-052-091545-
Atoka OK-Bryan OK-
1021 AM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR south central Atoka and
northwestern Bryan Counties Until 1045 AM CDT...

AT 1019 AM CDT, a strong thunderstorm was located near Armstrong,
moving northeast at 50 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...

LAT...LON 3416 9598 3415 9596 3414 9595 3413 9595
      3412 9594 3409 9594 3389 9631 3403 9644
      3436 9601 3416 9584
TIME...MOT...LOC 1519Z 233DEG 43KT 3401 9630

Zwink

Special weather statement, Apr 9, 10:32 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1032 AM CDT Fri Apr 9 2021

OKZ052-091600-
Bryan OK-
1032 AM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR central Bryan County Until 1100
AM CDT...

AT 1030 AM CDT, a strong thunderstorm was located over Utica, moving
northeast at 50 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...

LAT...LON 3387 9599 3387 9600 3386 9600 3384 9602
      3385 9602 3384 9604 3385 9610 3383 9610
      3384 9615 3382 9615 3381 9618 3380 9618
      3381 9616 3377 9617 3375 9620 3390 9634
      3413 9595 3394 9594 3392 9590
TIME...MOT...LOC 1530Z 233DEG 42KT 3389 9623

Zwink

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 2:57 AM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 31 more	20 hr
Apr 9, 10:21 AM CDT	Special Weather Statement	OUN	Bryan	24 min
Apr 9, 3:21 PM CDT	Special Weather Statement	OUN	Greer	24 min
Apr 9, 3:28 PM CDT	Severe Thunderstorm Warning	OUN	Greer	23 min
Apr 9, 3:35 PM CDT	Special Weather Statement	OUN	Washita	40 min
Apr 9, 3:39 PM CDT	Special Weather Statement	OUN	Kingfisher	36 min
Apr 9, 3:49 PM CDT	Special Weather Statement	OUN	Canadian	26 min
Apr 9, 3:52 PM CDT	Special Weather Statement	OUN	Greer	23 min
Apr 9, 3:57 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	48 min
Apr 9, 4:12 PM CDT	Special Weather Statement	OUN	Logan	33 min
Apr 9, 4:13 PM CDT	Special Weather Statement	OUN	Washita	32 min
Apr 9, 4:23 PM CDT	Special Weather Statement	OUN	Grant	37 min
Apr 9, 4:25 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	50 min
Apr 9, 4:29 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	16 min
Apr 9, 4:36 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	39 min
Apr 9, 4:52 PM CDT	Special Weather Statement	OUN	Kingfisher	23 min
Apr 9, 4:53 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	52 min
Apr 9, 5:06 PM CDT	Severe Thunderstorm Warning	OUN	Grady	39 min
Apr 9, 5:17 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	43 min
Apr 9, 5:18 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan, Oklahoma	42 min
Apr 9, 5:25 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	50 min
Apr 9, 5:31 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	44 min
Apr 9, 5:36 PM CDT	Special Weather Statement	OUN	Pottawatomie	24 min
Apr 9, 5:39 PM CDT	Special Weather Statement	OUN	Lincoln	36 min
Apr 9, 5:48 PM CDT	Special Weather Statement	OUN	Lincoln	27 min
Apr 9, 5:51 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	39 min
Apr 9, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	48 min
Apr 9, 6:05 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Stephens	40 min
Apr 9, 6:09 PM CDT	Special Weather Statement	OUN	Lincoln	36 min
Apr 9, 6:22 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	27 min
Apr 9, 6:34 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	56 min
Apr 9, 6:38 PM CDT	Special Weather Statement	OUN	Pottawatomie	52 min
Apr 9, 6:58 PM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	47 min

Nearby

Special Weather Statements in Oklahoma, 2021 Every 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.