Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

September 3, 2021Grant County, Oklahoma

NWS Norman, OK issued this special weather statement at Sep 3, 2021, 7:49 PM CDT for Grant County, Oklahoma. It was in force for 26 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
Sep 3, 2021, 7:49 PM CDT (00:49 UTC)
Expired
Sep 3, 2021, 8:15 PM CDT
In force
26 min
Issued by
NWS Norman, OK
Hail
0.00 in
Wind
50

County Grant County, OK

The radar

The Vance AFB radar (KVNX), 46 km from the middle of the area, began a volume at 00:50 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, 0.8 hours before the alert went out and 231 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-pSkew-T log-p diagram, Dodge City, at 00:00Z on 2021-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2188 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dodge City, at 00:00Z on 2021-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2188 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
712 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
1.4
Supercell composite
9.9

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 Sep 3, 6:37 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Sep 3, 6:37 PM CDT, 1 hour 12 minutes before
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Hazardous weather outlook, Sep 3, 6:55 PM CDT, 54 minutes before
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In the hours before

Special weather statement, Sep 3, 4:17 PM CDT, 3 hours 32 minutes before
Special Weather Statement
National Weather Service Norman OK
417 PM CDT Fri Sep 3 2021

OKZ004-009-010-032145-
Woodward OK-Harper OK-Ellis OK-
417 PM CDT Fri Sep 3 2021

...A strong thunderstorm will impact portions of north central Ellis,
southeastern Harper and southwestern Woodward Counties through 445 PM
CDT...

At 416 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Fort Supply, moving northeast at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Woodward, Mooreland, Gage, Fargo, Fort Supply, May, Selman and
Tangier.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3622 9976 3655 9985 3689 9947 3639 9915
TIME...MOT...LOC 2116Z 233DEG 27KT 3648 9966

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Ware
Special weather statement, Sep 3, 4:48 PM CDT, 3 hours 1 minute before
Special Weather Statement
National Weather Service Norman OK
448 PM CDT Fri Sep 3 2021

OKZ004-005-010-011-032230-
Major OK-Woodward OK-Harper OK-Woods OK-
448 PM CDT Fri Sep 3 2021

...A strong thunderstorm will impact portions of central Woods,
southeastern Harper, northwestern Major and central Woodward Counties
through 530 PM CDT...

At 446 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles east of Fort Supply, moving east at 35 mph. A wind gust of
54 mph was reported in Woodward at 430pm.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Woodward, Mooreland, Freedom, Alabaster Caverns State Park, Quinlan,
Bouse Junction and Camp Houston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3632 9945 3675 9959 3698 9907 3642 9883
TIME...MOT...LOC 2146Z 247DEG 31KT 3660 9939

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

Ware
Local storm report, Sep 3, 5:27 PM CDT, 2 hours 22 minutes before
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Special weather statement, Sep 3, 5:30 PM CDT, 2 hours 19 minutes before
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Special weather statement, Sep 3, 6:04 PM CDT, 1 hour 45 minutes before
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Special weather statement, Sep 3, 7:49 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 9:29 PM CDTAreal Flood AdvisoryOUNGrant3 hr
Sep 4, 4:19 PM CDTSpecial Weather StatementOUNOklahoma26 min
Sep 4, 4:49 PM CDTSpecial Weather StatementOUNTillman26 min
Sep 4, 4:56 PM CDTSpecial Weather StatementOUNPottawatomie34 min
Sep 4, 5:10 PM CDTSpecial Weather StatementOUNComanche35 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.