Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 51, NWS Cheyenne, WY

June 6, 20205 counties in Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 6, 2020, 5:58 PM MDT for 5 counties in Nebraska. It was in force for 77 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
Jun 6, 2020, 5:58 PM MDT (23:58 UTC)
Expired
Jun 6, 2020, 7:15 PM MDT
In force
77 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Box Butte County, NE, Dawes County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 168 km from the middle of the area, began a volume at 00:03 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 6, 1:23 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 12.0 hours before the alert went out and 211 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, Rapid City, SD at 12:00Z on 2020-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 39 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, Rapid City, SD at 12:00Z on 2020-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -52 square meters per square second.19395878Sfc1 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
39 J/kg
Mixed-layer CIN
-739 J/kg
Mixed-layer LCL
1598 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-52 m²/s²
0-3 km storm-relative helicity
-15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 6, 5:44 PM MDT, 14 minutes earlier.

Area forecast discussion, Jun 6, 5:44 PM MDT, 14 minutes before
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Hazardous weather outlook, Jun 6, 6:24 AM MDT, 11 hours 34 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
624 AM MDT Sat Jun 6 2020

NEZ002-003-019>021-054-055-095-096-WYZ101>119-071230-
Dawes-Box Butte-Scotts Bluff County-Banner County-Morrill-
Kimball County-Cheyenne-North Sioux-South Sioux-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
624 AM MDT Sat Jun 6 2020

This hazardous weather outlook is for portions of panhandle
Nebraska...western Nebraska...east central Wyoming...south
central Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Numerous thunderstorms are expected across a large portion of the
area this afternoon. The most likely time frame for severe
thunderstorms will be between Noon and 6 PM today. Wind gusts to
70 MPH will be the primary hazard, although isolated hail up to
golf ball size is also possible especially over western Nebraska.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Daily chances for showers and thunderstorms will persist through
at least Monday afternoon. Chances for severe weather appear low
at this time.

A strong cold front will force overnight lows into the mid 30s
for areas along and west of Interstate 25 on Monday night.
Freezing temperatures are possible.

.Spotter information statement...

Spotter activation may be necessary this afternoon.

In the hours before

Local storm report, Jun 6, 5:49 PM MDT, 9 minutes before
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Local storm report, Jun 6, 5:51 PM MDT, 7 minutes before
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Local storm report, Jun 6, 5:52 PM MDT, 6 minutes before
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Local storm report, Jun 6, 5:54 PM MDT, 4 minutes before
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Local storm report, Jun 6, 5:55 PM MDT, 3 minutes before
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Local storm report, Jun 6, 5:58 PM MDT, 0 minutes before
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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 5, 6:14 PM MDTSpecial Weather StatementCYSNiobrara31 min
Jun 5, 6:17 PM MDTSevere Thunderstorm WarningCYSNiobrara28 min
Jun 5, 6:44 PM MDTSevere Thunderstorm WarningCYSNiobrara31 min
Jun 5, 7:12 PM MDTSevere Thunderstorm WarningCYSNiobrara33 min
Jun 6, 12:13 AM MDTSpecial Weather StatementCYSAlbany, Carbon62 min
Jun 6, 1:28 PM MDTSevere Thunderstorm WarningCYSCarbon62 min
Jun 6, 2:09 PM MDTSevere Thunderstorm WarningCYSCarbon66 min
Jun 6, 2:29 PM MDTSevere Thunderstorm WarningCYSCarbon31 min
Jun 6, 2:53 PM MDTSevere Thunderstorm WarningCYSAlbany, Carbon67 min
Jun 6, 3:02 PM MDTTornado WarningCYSAlbany, Carbon28 min
Jun 6, 3:40 PM MDTSevere Thunderstorm WarningCYSAlbany, Converse, Platte65 min
Jun 6, 4:08 PM MDTSevere Thunderstorm WarningCYSLaramie52 min
Jun 6, 4:23 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie37 min
Jun 6, 4:39 PM MDTSevere Thunderstorm WarningCYSConverse, Goshen, Niobrara, Platte51 min
Jun 6, 4:56 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie49 min
Jun 6, 5:14 PM MDTSevere Thunderstorm WarningCYSGoshen, Niobrara31 min
Jun 6, 5:32 PM MDTSevere Thunderstorm WarningCYSGoshen43 min
Jun 6, 5:42 PM MDTSevere Thunderstorm WarningCYSGoshen, Niobrara33 min
Jun 5, 6:55 PM MDTSpecial Weather StatementCYSKimball35 min
Jun 5, 7:30 PM MDTSpecial Weather StatementCYSKimball30 min
Jun 5, 7:43 PM MDTSevere Thunderstorm WarningCYSDawes, Sioux32 min
Jun 5, 8:13 PM MDTSevere Thunderstorm WarningCYSDawes, Sioux32 min
Jun 5, 8:45 PM MDTSevere Thunderstorm WarningCYSDawes30 min
Jun 5, 9:58 PM MDTSpecial Weather StatementCYSCheyenne32 min
Jun 6, 5:28 PM MDTSevere Thunderstorm WarningCYSBanner, Cheyenne, Kimball, Morrill77 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.