Alert archive / Nebraska / Special Weather Statements in 2021

Special Weather Statement, NWS Omaha, NE

October 23, 2021Johnson County, Nebraska

NWS Omaha, NE issued this special weather statement at Oct 23, 2021, 11:20 PM CDT for Johnson County, Nebraska. It was in force for 25 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: Oct 23, 2021, 11:20 PM CDT (04:20 UTC)
Expired: Oct 23, 2021, 11:45 PM CDT
In force: 25 min
Issued by: NWS Omaha, NE
Hail: 0.88 in
Wind: 30

County Johnson County, NE

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 04:20 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

Topeka, KS (KTOP), launched 00:00Z, 4.3 hours before the alert went out and 158 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 616 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 493 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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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 23, 11:44 PM CDT	Special Weather Statement	OAX	Nemaha	31 min
Oct 24, 9:41 AM CDT	Special Weather Statement	OAX	Dodge	34 min
Oct 24, 12:33 PM CDT	Areal Flood Advisory	OAX	Douglas, Sarpy	4 hr
Oct 24, 1:18 PM CDT	Areal Flood Advisory	OAX	Lancaster	3 hr
Oct 24, 1:47 PM CDT	Flash Flood Warning	OAX	Lancaster	3 hr
Oct 24, 2:30 PM CDT	Areal Flood Advisory	OAX	Fremont, Page	3 hr

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.