Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 113, NWS St. Louis, MO

June 14, 2017Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 14, 2017, 2:04 PM CDT for Brown County, Illinois. It was in force for 41 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: Jun 14, 2017, 2:04 PM CDT (19:04 UTC)
Expired: Jun 14, 2017, 2:45 PM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Brown County, IL

The radar

The Lincoln radar (KILX), 111 km from the middle of the area, began a volume at 19:04 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
Jun 14, 2:15 PM CDT	TSTM WND DMG	Mount Sterling, IL	A FEW TREES WERE BLOWN OVER ROADWAYS THROUGHOUT THE TOWN OF MOUNT STERLING.

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
Jun 14, 1:04 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.1 hours before the alert went out and 174 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: 971 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

993 
WUUS53 KLSX 141904
SVRLSX
ILC009-141945-
/O.NEW.KLSX.SV.W.0113.170614T1904Z-170614T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
204 PM CDT WED JUN 14 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Brown County in west central Illinois...

* Until 245 PM CDT.

* At 203 PM CDT, a severe thunderstorm was located over Buckhorn,
  moving east at 30 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Mount Sterling, La Grange, Versailles, Ripley and Coopertown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 9070 4009 9070 4008 9067 4005 9068
      4002 9063 4003 9061 4001 9062 4000 9060
      3998 9060 3999 9052 3997 9051 3995 9053
      3992 9054 3988 9058 3984 9058 3984 9082
      4011 9077
TIME...MOT...LOC 1903Z 265DEG 27KT 3995 9085 

HAIL...0.88IN
WIND...60MPH
 
$$

Kanofsky

1 follow-up statement

183 
WWUS53 KLSX 141946
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
246 PM CDT WED JUN 14 2017

ILC009-141956-
/O.EXP.KLSX.SV.W.0113.000000T0000Z-170614T1945Z/
Brown IL-
246 PM CDT WED JUN 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR BROWN COUNTY HAS EXPIRED...
                
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 has been allowed to expire.

A severe thunderstorm watch remains in effect until 800 PM CDT for
west central Illinois.

LAT...LON 4010 9070 4009 9070 4008 9067 4005 9068
      4002 9063 4003 9061 4001 9062 4000 9060
      3998 9060 3999 9052 3997 9051 3995 9053
      3992 9054 3988 9058 3984 9058 3984 9082
      4011 9077
TIME...MOT...LOC 1946Z 265DEG 27KT 3998 9044 

$$

Kanofsky

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 14, 12:10 PM CDT	Special Weather Statement	LSX	Jersey, Macoupin	50 min
Jun 14, 12:21 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	39 min
Jun 14, 12:31 PM CDT	Severe Thunderstorm Warning	LSX	Madison	29 min
Jun 14, 12:35 PM CDT	Severe Thunderstorm Warning	LSX	Adams	40 min
Jun 14, 12:51 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	39 min
Jun 14, 1:12 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	63 min
Jun 14, 4:39 PM CDT	Special Weather Statement	LSX	Adams	51 min
Jun 14, 4:48 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	42 min
Jun 14, 5:59 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	46 min
Jun 14, 6:41 PM CDT	Severe Thunderstorm Warning	LSX	Pike	49 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 Every severe thunderstorm warning in 2017

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.