Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 92, NWS Paducah, KY

August 12, 2021Franklin County, Jefferson County, Perry County, Illinois

NWS Paducah, KY issued this severe thunderstorm warning at Aug 12, 2021, 8:07 PM CDT for Franklin County, Jefferson County, Perry County, Illinois. It was in force for 38 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 12, 2021, 8:07 PM CDT (01:07 UTC)
Expired: Aug 12, 2021, 8:45 PM CDT
In force: 38 min
Issued by: NWS Paducah, KY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Franklin County, IL, Jefferson County, IL, Perry County, IL

The radar

The Evansville,IN radar (KVWX), 115 km from the middle of the area, began a volume at 01:10 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.

What was reported inside it

Time	Report	Where	Remark
Aug 12, 8:25 PM CDT	TSTM WND DMG	Tamaroa, IL	TREES REPORTED DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Aug 12, 7:37 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.1 hours before the alert went out and 219 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: 1699 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

329 
WUUS53 KPAH 130107
SVRPAH
ILC055-081-145-130145-
/O.NEW.KPAH.SV.W.0092.210813T0107Z-210813T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Paducah KY
807 PM CDT Thu Aug 12 2021

The National Weather Service in Paducah has issued a

* Severe Thunderstorm Warning for...
  Eastern Perry County in south central Illinois...
  Jefferson County in south central Illinois...
  Northwestern Franklin County in south central Illinois...

* Until 845 PM CDT.

* At 807 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles southeast of Carlyle to 6 miles south of
  Nashville to Percy, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Tamaroa around 820 PM CDT.

Other locations in the path of these severe thunderstorms include
Woodlawn, Du Quoin and Valier.

This includes the following highways...
 Interstate 57 in Illinois between Mile Markers 81 and 105.
 Interstate 64 in Illinois between Mile Markers 63 and 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3820 8882 3795 8913 3795 8948 3821 8915
      3847 8914 3848 8876
TIME...MOT...LOC 0107Z 275DEG 37KT 3852 8930 3825 8938 3800 8961 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

08

The office that day

Everything else NWS Paducah, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 7:23 PM CDT	Severe Thunderstorm Warning	PAH	Jackson, Perry	52 min
Aug 12, 8:11 PM CDT	Severe Thunderstorm Warning	PAH	Jackson	49 min
Aug 12, 8:34 PM CDT	Special Weather Statement	PAH	Franklin, Hamilton, Saline, Union, Wayne, Williamson	71 min
Aug 12, 9:39 PM CDT	Special Weather Statement	PAH	Hamilton, Johnson, Pulaski, Saline, Union, White and 1 more	66 min
Aug 12, 10:44 PM CDT	Special Weather Statement	PAH	Alexander	46 min

Nearby

Severe Thunderstorm Warnings in Illinois, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.