Alert archive / Nebraska / Mesoscale Discussions in 2023

Mesoscale Discussion 906

May 30, 20234 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 30, 2023, 11:21 PM CDT for 4 counties in Nebraska. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
May 30, 2023, 11:21 PM CDT (04:21 UTC)
Expired
May 31, 2023, 1:15 AM CDT
In force
114 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 249

Counties Blaine County, NE, Brown County, NE, Keya Paha County, NE, Logan County, NE

The radar

The North Platte radar (KLNX), 30 km from the middle of the area, began a volume at 04:25 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.4 hours before the alert went out and 82 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, N. Platte/Lee Bi, NE at 00:00Z on 2023-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2814 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, N. Platte/Lee Bi, NE at 00:00Z on 2023-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
2814 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
1491 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.5
Supercell composite
5.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 30, 8:10 PM CDTMesoscale DiscussionSPCArthur, Box Butte, Chase, Cherry, Cheyenne, Dawes and 15 more2 hr
May 31, 3:39 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more3 hr

Nearby

Mesoscale Discussions in Nebraska, 2023Every mesoscale discussion in 2023

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.