Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

March 13, 2021Harmon County, Oklahoma

NWS Norman, OK issued this special weather statement at Mar 13, 2021, 1:41 AM CST for Harmon County, Oklahoma. It was in force for 49 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: Mar 13, 2021, 1:41 AM CST (07:41 UTC)
Expired: Mar 13, 2021, 2:30 AM CST
In force: 49 min
Issued by: NWS Norman, OK

County Harmon County, OK

The radar

The Altus AFB radar (KFDR), 80 km from the middle of the area, began a volume at 07:41 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 7.7 hours before the alert went out and 187 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 566 m above ground
0-6 km bulk shear: 92 kt
0-1 km storm-relative helicity: 384 m²/s²
0-3 km storm-relative helicity: 512 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Mar 12, 10:59 PM CST, 2 hours 42 minutes earlier.

Area forecast discussion, Mar 12, 10:59 PM CST, 2 hours 42 minutes before

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Hazardous weather outlook, Mar 12, 10:05 PM CST, 3 hours 36 minutes before

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In the hours before

Special weather statement, Mar 12, 8:00 PM CST, 5 hours 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
800 PM CST Fri Mar 12 2021

OKZ016>018-024-130230-
Kingfisher OK-Canadian OK-Custer OK-Blaine OK-
800 PM CST Fri Mar 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Kingfisher...
northwestern Canadian...northeastern Custer and central Blaine
Counties Until 830 PM CST...

AT 756 PM CST, a strong thunderstorm was located 8 miles west of
Greenfield, moving northeast at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...

LAT...LON 3603 9836 3590 9821 3573 9815 3559 9863
      3573 9878 3581 9866 3581 9863 3584 9863
TIME...MOT...LOC 0156Z 238DEG 27KT 3573 9853

JP

Special weather statement, Mar 12, 8:40 PM CST, 5 hours 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
840 PM CST Fri Mar 12 2021

OKZ008-013-130315-
Kay OK-Noble OK-
840 PM CST Fri Mar 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR south central Kay and
northeastern Noble Counties Until 915 PM CST...

AT 837 PM CST, a strong thunderstorm was located near Red Rock,
moving northeast at 25 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Minor flooding in areas of poor drainage...

LAT...LON 3666 9706 3660 9704 3659 9706 3658 9700
      3660 9691 3658 9689 3656 9689 3655 9690
      3653 9699 3651 9701 3651 9703 3644 9703
      3637 9721 3649 9727
TIME...MOT...LOC 0237Z 241DEG 21KT 3646 9714

TL

Special weather statement, Mar 13, 1:19 AM CST, 22 minutes before

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Special weather statement, Mar 13, 1:41 AM CST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 6:15 PM CST	Areal Flood Advisory	OUN	Alfalfa, Blaine, Dewey, Garfield, Grant, Major	3 hr
Mar 12, 6:18 PM CST	Special Weather Statement	OUN	Custer	42 min
Mar 12, 6:33 PM CST	Special Weather Statement	OUN	Washita	27 min
Mar 12, 6:38 PM CST	Flash Flood Warning	OUN	Alfalfa, Garfield, Grant, Major	3 hr
Mar 12, 6:45 PM CST	Special Weather Statement	OUN	Blaine	45 min
Mar 12, 7:05 PM CST	Special Weather Statement	OUN	Kay	25 min
Mar 12, 7:18 PM CST	Areal Flood Advisory	OUN	Kay, Noble	3 hr
Mar 12, 7:31 PM CST	Special Weather Statement	OUN	Blaine	29 min
Mar 12, 7:35 PM CST	Areal Flood Advisory	OUN	Custer	3 hr
Mar 12, 8:00 PM CST	Special Weather Statement	OUN	Blaine	30 min
Mar 12, 8:07 PM CST	Severe Thunderstorm Warning	OUN	Blaine, Custer, Kingfisher	38 min
Mar 12, 8:40 PM CST	Special Weather Statement	OUN	Noble	35 min
Mar 12, 8:42 PM CST	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	48 min
Mar 12, 9:26 PM CST	Severe Thunderstorm Warning	OUN	Kingfisher	34 min
Mar 13, 1:19 AM CST	Special Weather Statement	OUN	Harmon	26 min
Mar 13, 2:31 AM CST	Special Weather Statement	OUN	Jackson	29 min
Mar 13, 4:42 AM CST	Dense Fog Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 22 more	7 hr
Mar 13, 7:54 AM CST	River Flood Advisory	OUN	Blaine, Canadian	13 hr
Mar 13, 12:02 PM CST	Dense Fog Advisory	OUN	Alfalfa, Harper, Woods	118 min
Mar 13, 2:08 PM CST	River Flood Advisory	OUN	Blaine, Caddo, Canadian, Custer	39 hr
Mar 12, 9:16 PM CST	Severe Thunderstorm Warning	OUN	Foard	44 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.