Alert archive / Nebraska / Special Weather Statements in 2021

Special Weather Statement, NWS Omaha, NE

June 20, 2021Otoe County, Nebraska

NWS Omaha, NE issued this special weather statement at Jun 20, 2021, 1:21 AM CDT for Otoe County, Nebraska. It was in force for 24 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: Jun 20, 2021, 1:21 AM CDT (06:21 UTC)
Expired: Jun 20, 2021, 1:45 AM CDT
In force: 24 min
Issued by: NWS Omaha, NE

County Otoe County, NE

The radar

The Omaha radar (KOAX), 52 km from the middle of the area, began a volume at 06:22 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, 6.4 hours before the alert went out and 51 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: 2439 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

583 
WWUS83 KOAX 200621
SPSOAX

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
121 AM CDT Sun Jun 20 2021
 
NEZ051-053-066>068-090-200645-
Saunders NE-Cass NE-Sarpy NE-Otoe NE-Lancaster NE-Johnson NE-
121 AM CDT Sun Jun 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SARPY...NORTHEASTERN
LANCASTER...NORTHWESTERN JOHNSON...OTOE...SOUTHERN SAUNDERS AND
WESTERN CASS COUNTIES UNTIL 145 AM CDT...

At 120 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Valparaiso to 5 miles northeast of Lincoln
to near Douglas. Movement was northeast at 40 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Northeastern Lincoln, Wahoo, Waverly, Ashland, Syracuse, Weeping
Water, Bennet, Elmwood, Valparaiso, Mead, Greenwood, Palmyra,
Unadilla, Panama, Avoca, Murdock, Douglas, Lorton, Eagle and Ceresco.

This includes Interstate 80 in Nebraska between mile markers 403 and
430.
 
A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
southeastern and east central Nebraska.

LAT...LON 4082 9666 4110 9688 4126 9643 4099 9618
      4056 9600 4049 9645
TIME...MOT...LOC 0620Z 243DEG 40KT 4111 9685 4085 9660 4058 9644 

$$

Mead

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 12:01 AM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline, Seward	44 min
Jun 20, 1:05 AM CDT	Special Weather Statement	OAX	Johnson, Pawnee	25 min
Jun 20, 1:34 AM CDT	Special Weather Statement	OAX	Nemaha, Richardson	41 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.