Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 149, NWS Hastings, NE

July 20, 2020Dawson County, Nebraska

NWS Hastings, NE issued this severe thunderstorm warning at Jul 20, 2020, 8:43 PM CDT for Dawson County, Nebraska. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 20, 2020, 8:43 PM CDT (01:43 UTC)
Expired
Jul 20, 2020, 9:30 PM CDT
In force
47 min
Issued by
NWS Hastings, NE
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Dawson County, NE

The radar

The Grand Island radar (KUEX), 131 km from the middle of the area, began a volume at 01:47 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

Denver, CO (KDNR), launched 00:00Z, 1.7 hours before the alert went out and 310 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, Denver, CO at 00:00Z on 2020-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 218 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, Denver, CO at 00:00Z on 2020-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -43 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
218 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
3375 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-43 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 8:27 PM CDTSpecial Weather StatementGIDDawson33 min
Jul 20, 9:18 PM CDTSpecial Weather StatementGIDFurnas, Gosper, Phelps42 min
Jul 20, 9:41 PM CDTSpecial Weather StatementGIDMerrick, Nance49 min
Jul 20, 10:06 PM CDTSpecial Weather StatementGIDBuffalo, Furnas, Phelps39 min
Jul 20, 10:39 PM CDTSpecial Weather StatementGIDMerrick, Polk51 min
Jul 20, 11:12 PM CDTAreal Flood AdvisoryGIDMerrick, Nance, Polk12 hr
Jul 20, 11:30 PM CDTSpecial Weather StatementGIDGreeley30 min
Jul 21, 12:15 AM CDTAreal Flood AdvisoryGIDGreeley, Nance, Valley11 hr
Jul 20, 11:10 PM CDTSpecial Weather StatementGIDPhillips50 min
Jul 20, 11:49 PM CDTSpecial Weather StatementGIDRooks, Smith41 min
Jul 21, 12:28 AM CDTSpecial Weather StatementGIDOsborne, Smith47 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2020Every severe thunderstorm warning in 2020

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.