Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 104, NWS North Platte, NE

July 30, 2021Logan County, McPherson County, Thomas County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 30, 2021, 6:32 PM CDT for Logan County, McPherson County, Thomas County, Nebraska. It was in force for 43 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: Jul 30, 2021, 6:32 PM CDT (23:32 UTC)
Expired: Jul 30, 2021, 7:15 PM CDT
In force: 43 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Logan County, NE, McPherson County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 14 km from the middle of the area, began a volume at 23:35 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.

Issued	Product	Office	Lasted
Jul 30, 4:04 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.5 hours before the alert went out and 79 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: 1419 J/kg
Mixed-layer CIN: -169 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

709 
WUUS53 KLBF 302332
SVRLBF
NEC113-117-171-310015-
/O.NEW.KLBF.SV.W.0104.210730T2332Z-210731T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
632 PM CDT Fri Jul 30 2021

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Northwestern Logan County in west central Nebraska...
  Northeastern McPherson County in west central Nebraska...
  Southwestern Thomas County in north central Nebraska...

* Until 715 PM CDT.

* At 631 PM CDT, a severe thunderstorm was located near Thedford,
  moving south at 15 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Thedford and Highway 83 crossing The Dismal River. 

This includes the following highways...
 Highway 2 between mile markers 206 and 210.
 Highway 83 between mile markers 126 and 148.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in North Platte.

&&

A Tornado Watch remains in effect until 1000 PM CDT for north central
and west central Nebraska.

LAT...LON 4194 10079 4201 10057 4170 10037 4162 10072
TIME...MOT...LOC 2331Z 341DEG 13KT 4190 10065 

HAIL...1.25IN
WIND...60MPH
 
$$

NMJ

2 follow-up statements

108 
WWUS53 KLBF 302350
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
650 PM CDT Fri Jul 30 2021

NEC113-117-171-310015-
/O.CON.KLBF.SV.W.0104.000000T0000Z-210731T0015Z/
Logan NE-McPherson NE-Thomas NE-
650 PM CDT Fri Jul 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHWESTERN LOGAN...NORTHEASTERN MCPHERSON AND SOUTHWESTERN
THOMAS COUNTIES...

At 649 PM CDT, a severe thunderstorm was located 9 miles south of
Thedford, moving south at 15 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Highway 83 crossing The Dismal River.

This includes Highway 83 between mile markers 126 and 145.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
North Platte.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4188 10077 4195 10053 4170 10037 4162 10072
      4179 10076
TIME...MOT...LOC 2349Z 339DEG 14KT 4185 10063 

HAIL...1.25IN
WIND...60MPH
 
$$

NMJ

631 
WWUS53 KLBF 310012
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
712 PM CDT Fri Jul 30 2021

NEC113-117-171-310021-
/O.EXP.KLBF.SV.W.0104.000000T0000Z-210731T0015Z/
Logan NE-McPherson NE-Thomas NE-
712 PM CDT Fri Jul 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LOGAN...
NORTHEASTERN MCPHERSON AND SOUTHWESTERN THOMAS COUNTIES WILL EXPIRE
AT 715 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 1000 PM CDT for north central
and west central Nebraska.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
North Platte.

LAT...LON 4188 10077 4195 10053 4170 10037 4162 10072
      4179 10076
TIME...MOT...LOC 0011Z 341DEG 13KT 4178 10060 

$$

NMJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 7:03 PM CDT	Special Weather Statement	LBF	Lincoln	42 min
Jul 29, 7:20 PM CDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln	40 min
Jul 30, 5:40 PM CDT	Special Weather Statement	LBF	Logan	50 min
Jul 30, 5:58 PM CDT	Special Weather Statement	LBF	Thomas	47 min
Jul 30, 6:05 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer, Logan, Thomas	40 min
Jul 30, 6:46 PM CDT	Special Weather Statement	LBF	Garden	29 min
Jul 30, 6:47 PM CDT	Special Weather Statement	LBF	Logan	43 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021 Every severe thunderstorm warning 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.