Alert archive / Nebraska / Special Weather Statements in 2021

Special Weather Statement, NWS Omaha, NE

September 20, 2021Cedar County, Nebraska

NWS Omaha, NE issued this special weather statement at Sep 20, 2021, 2:30 AM CDT for Cedar County, Nebraska. It was in force for 45 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 20, 2021, 2:30 AM CDT (07:30 UTC)
Expired: Sep 20, 2021, 3:15 AM CDT
In force: 45 min
Issued by: NWS Omaha, NE
Hail: 0.50 in
Wind: 40

County Cedar County, NE

The radar

The Sioux Falls radar (KFSD), 122 km from the middle of the area, began a volume at 07:33 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

Omaha, NE (KOAX), launched 00:00Z, 7.5 hours before the alert went out and 159 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: 816 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1784 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Omaha, NE wrote its last area forecast discussion before this special weather statement went out at Sep 20, 12:06 AM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Sep 20, 12:06 AM CDT, 2 hours 24 minutes before

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Hazardous weather outlook, Sep 19, 3:22 PM CDT, 11 hours 8 minutes before

Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
322 PM CDT Sun Sep 19 2021

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-201030-
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-
Page-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-Saline-
Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson-
322 PM CDT Sun Sep 19 2021

This Hazardous Weather Outlook is for portions of southwest
Iowa...west central Iowa...east central Nebraska...northeast
Nebraska and southeast Nebraska.

.DAY ONE...Tonight and Monday

Widely scattered thunderstorms are possible tonight, a few of
which could produce gusty winds of 40 to 50 mph, especially near
the South Dakota border. Additional storms may materialize on
Monday afternoon along a cold front moving through the area. The
best potential for a strong storm or two will be in the Falls
City and Clarinda, IA areas in the 2 to 4 PM timeframe. Gusty
winds and small hail will be the main hazards.

.DAYS TWO THROUGH SEVEN...Monday night through Sunday

No Hazardous Weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

In the hours before

Special weather statement, Sep 19, 11:39 PM CDT, 2 hours 51 minutes before

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
1139 PM CDT Sun Sep 19 2021

NEZ011-012-016-200515-
Cedar NE-Knox NE-Antelope NE-
1139 PM CDT Sun Sep 19 2021

...A strong thunderstorm will impact portions of northeastern
Antelope, eastern Knox and northern Cedar Counties through 1215 AM
CDT...

At 1138 PM CDT, Doppler radar was tracking a strong thunderstorm 5
miles north of Creighton, or 28 miles southwest of Lewis And Clark
State Recreation Area, moving northeast at 40 mph.

HAZARD...Winds in excess of 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Bloomfield around 1155 PM CDT.

Other locations in the path of this storm include Yankton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4285 9729 4285 9722 4281 9721 4280 9716
      4277 9713 4277 9706 4240 9790 4259 9805
      4286 9763 4285 9744 4287 9742 4287 9738
      4285 9736 4287 9731
TIME...MOT...LOC 0438Z 224DEG 42KT 4254 9787

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Kern

Special weather statement, Sep 19, 11:40 PM CDT, 2 hours 50 minutes before

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Special weather statement, Sep 20, 12:14 AM CDT, 2 hours 16 minutes before

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Special weather statement, Sep 20, 12:32 AM CDT, 1 hour 58 minutes before

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Special weather statement, Sep 20, 12:47 AM CDT, 1 hour 43 minutes before

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Special weather statement, Sep 20, 2:30 AM CDT, 0 minutes before

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The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 19, 10:57 PM CDT	Special Weather Statement	OAX	Antelope	33 min
Sep 19, 11:39 PM CDT	Special Weather Statement	OAX	Knox	36 min
Sep 19, 11:40 PM CDT	Special Weather Statement	OAX	Pierce, Wayne	35 min
Sep 20, 12:14 AM CDT	Special Weather Statement	OAX	Cedar	31 min
Sep 20, 12:32 AM CDT	Special Weather Statement	OAX	Knox	43 min
Sep 20, 12:47 AM CDT	Special Weather Statement	OAX	Cedar	43 min

Nearby

Special Weather Statements in Nebraska, 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.