Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 49, NWS St. Louis, MO

March 30, 2017Fayette County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 30, 2017, 2:23 PM CDT for Fayette County, Illinois. It was in force for 23 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: Mar 30, 2017, 2:23 PM CDT (19:23 UTC)
Expired: Mar 30, 2017, 2:46 PM CDT
In force: 23 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Fayette County, IL

The radar

The Lincoln radar (KILX), 121 km from the middle of the area, began a volume at 19:22 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
Mar 30, 12:31 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.4 hours before the alert went out and 125 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: 847 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 347 m²/s²
0-3 km storm-relative helicity: 373 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

997 
WUUS53 KLSX 301923
SVRLSX
ILC051-302015-
/O.NEW.KLSX.SV.W.0049.170330T1923Z-170330T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
223 PM CDT THU MAR 30 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northern Fayette County in south central Illinois...

* Until 315 PM CDT.

* At 223 PM CDT, a severe thunderstorm was located near Ramsey,
  moving east at 35 mph.

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

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Vandalia, St. Elmo, Ramsey, Brownstown, Wrights Corner, Avena,
  Shafter, Herrick, Bingham and Bayle City.

This includes Interstate 70 in Illinois between exits 61 and 76.
 
This also includes  Ramsey Lake State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3896 8923 3916 8925 3922 8903 3922 8881
      3898 8881
TIME...MOT...LOC 1923Z 262DEG 31KT 3909 8908 

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

Carney

1 follow-up statement

517 
WWUS53 KLSX 301946
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
246 PM CDT THU MAR 30 2017

ILC051-301956-
/O.CAN.KLSX.SV.W.0049.000000T0000Z-170330T2015Z/
Fayette IL-
246 PM CDT THU MAR 30 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN FAYETTE 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 severe thunderstorm watch remains in effect until 800 PM CDT for
south central Illinois.

LAT...LON 3896 8923 3916 8925 3922 8903 3922 8881
      3898 8881
TIME...MOT...LOC 1945Z 262DEG 31KT 3912 8882 

$$

Carney

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 8:55 PM CDT	Severe Thunderstorm Warning	LSX	Adams	35 min
Mar 30, 11:49 AM CDT	Special Weather Statement	LSX	Jersey	41 min
Mar 30, 12:05 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin	40 min
Mar 30, 12:37 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	23 min
Mar 30, 12:58 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison, Montgomery	47 min
Mar 30, 2:19 PM CDT	Special Weather Statement	LSX	Fayette	41 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.