Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 196, NWS St. Louis, MO

November 5, 2017Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Nov 5, 2017, 4:42 PM CST for Randolph County, Illinois. It was in force for 22 min. 2 reports 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: Nov 5, 2017, 4:42 PM CST (22:42 UTC)
Expired: Nov 5, 2017, 5:04 PM CST
In force: 22 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Randolph County, IL

The radar

The St Louis radar (KLSX), 110 km from the middle of the area, began a volume at 22:46 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
Nov 5, 4:47 PM CST	HAIL 0.88	Sparta, IL	TWITTER REPORT.
Nov 5, 4:55 PM CST	HAIL 0.5	Coulterville, IL

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
Nov 5, 12:35 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.7 hours before the alert went out and 250 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: 1199 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 454 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 322 m²/s²
0-3 km storm-relative helicity: 382 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

As transmitted.

900 
WUUS53 KLSX 052242
SVRLSX
ILC157-052330-
/O.NEW.KLSX.SV.W.0196.171105T2242Z-171105T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
442 PM CST SUN NOV 5 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northeastern Randolph County in southwestern Illinois...

* Until 530 PM CST.

* At 441 PM CST, a severe thunderstorm was located over Sparta,
  moving east at 45 mph.

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

  SOURCE...Radar indicated. Several reports of quarter size hail 
           have been reported with this storm during its life.

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

* Locations impacted include...
  Sparta, Bremen, Steeleville, Percy, Coulterville, Tilden, Eden and
  Blair.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 700 PM CST for south central
and southwestern Illinois.

LAT...LON 3797 8983 3822 8968 3822 8959 3796 8960
TIME...MOT...LOC 2241Z 274DEG 40KT 3816 8969 

HAIL...1.00IN
WIND...60MPH
 
$$

Glass

1 follow-up statement

805 
WWUS53 KLSX 052304
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
504 PM CST SUN NOV 5 2017

ILC157-052314-
/O.CAN.KLSX.SV.W.0196.000000T0000Z-171105T2330Z/
Randolph IL-
504 PM CST SUN NOV 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN RANDOLPH COUNTY
IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However gusty winds and heavy rain are still
possible with this thunderstorm.

A tornado watch remains in effect until 700 PM CST for south central
and southwestern Illinois.

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

LAT...LON 3797 8983 3822 8968 3822 8959 3796 8960
TIME...MOT...LOC 2303Z 274DEG 40KT 3814 8936 

$$

Glass

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 5, 1:41 PM CST	Special Weather Statement	LSX	Macoupin	49 min
Nov 5, 1:44 PM CST	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin	30 min
Nov 5, 2:19 PM CST	Special Weather Statement	LSX	Macoupin	41 min
Nov 5, 2:26 PM CST	Areal Flood Advisory	LSX	Macoupin, Montgomery	3 hr
Nov 5, 2:27 PM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	48 min
Nov 5, 2:55 PM CST	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison	50 min
Nov 5, 2:57 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	48 min
Nov 5, 3:37 PM CST	Severe Thunderstorm Warning	LSX	Monroe	41 min
Nov 5, 4:07 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair, Washington	38 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.