Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 22, NWS St. Louis, MO

February 28, 2017Adams County, Pike County, Illinois; Marion County, Ralls County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 28, 2017, 8:29 PM CST for Adams County, Pike County, Illinois; Marion County, Ralls County, Missouri. It was in force for 33 min. 5 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: Feb 28, 2017, 8:29 PM CST (02:29 UTC)
Expired: Feb 28, 2017, 9:02 PM CST
In force: 33 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Adams County, IL, Pike County, IL, Marion County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 128 km from the middle of the area, began a volume at 02:29 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
Feb 28, 8:46 PM CST	HAIL 1	Hannibal, MO
Feb 28, 8:50 PM CST	TSTM WND DMG	2 Nw Hannibal, MO	DELAYED REPORT. SHINGLES BLOWN OFF OF A ROOF AND A FEW BOARDS BLOWN OFF OF A BARN. BUILDINGS ARE LOCATED ALONG STATE ROAD 168 APPROXIMATELY 2 MILES NORTHWEST OF HANNIBAL. TIME ESTIMATED FROM RADAR.
Feb 28, 8:50 PM CST	HAIL 1	Hannibal, MO
Feb 28, 8:50 PM CST	HAIL 1.25	2 Nw Hannibal, MO	DELAYED REPORT. SHINGLES BLOWN OFF OF A ROOF AND A FEW BOARDS BLOWN OFF OF A BARN. BUILDINGS ARE LOCATED ALONG STATE ROAD 168 APPROXIMATELY 2 MILES NORTHWEST OF HANNIBAL. TIME ESTIMATED FROM RADAR.
Feb 28, 8:55 PM CST	HAIL 1	Payson, 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
Feb 28, 2:57 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.5 hours before the alert went out and 215 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: 23 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1185 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

499 
WUUS53 KLSX 010229
SVRLSX
ILC001-149-MOC127-173-010315-
/O.NEW.KLSX.SV.W.0022.170301T0229Z-170301T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
829 PM CST TUE FEB 28 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northwestern Pike County in west central Illinois...
  Southern Adams County in west central Illinois...
  Northern Ralls County in northeastern Missouri...
  Eastern Marion County in northeastern Missouri...

* Until 915 PM CST.

* At 828 PM CST, a severe thunderstorm was located near Monroe City,
  moving east at 60 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...
  Quincy, Hannibal, Palmyra, Monroe City, Quincy Regional Airport,
  Barry, Camp Point, Payson, Clayton, Fall Creek, Beverly,
  Rensselaer, Spaulding, Adams, Kingston, Burton, Liberty, Hull,
  Richfield and Plainville.

This includes the following highways...
 Interstate 172 between exits 2 and 14.
 Interstate 72 between exits 4 and 20.

This also includes  Siloam Springs State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

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

&&

A tornado watch remains in effect until 1000 PM CST for west central
Illinois...and northeastern Missouri.

LAT...LON 3969 9092 3957 9171 3980 9171 4010 9092
TIME...MOT...LOC 0228Z 250DEG 52KT 3968 9168 

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

Britt

1 follow-up statement

096 
WWUS53 KLSX 010302
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
902 PM CST TUE FEB 28 2017

ILC001-149-MOC127-173-010312-
/O.CAN.KLSX.SV.W.0022.000000T0000Z-170301T0315Z/
Pike IL-Adams IL-Ralls MO-Marion MO-
902 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN PIKE AND SOUTHERN
ADAMS COUNTIES IN WEST CENTRAL ILLINOIS...NORTHERN RALLS AND EASTERN
MARION COUNTIES IN NORTHEASTERN MISSOURI IS CANCELLED...
                
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 cancelled.

A tornado watch remains in effect until 1000 PM CST for west central
Illinois...and northeastern Missouri.

Remember, a Severe Thunderstorm Warning still remains in effect.

LAT...LON 3969 9092 3957 9171 3980 9171 4010 9092
TIME...MOT...LOC 0300Z 250DEG 52KT 3985 9108 

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 6:14 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair, Washington	46 min
Feb 28, 6:22 PM CST	Severe Thunderstorm Warning	LSX	Fayette	23 min
Feb 28, 6:57 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	48 min
Feb 28, 7:34 PM CST	Severe Thunderstorm Warning	LSX	Randolph	17 min
Feb 28, 8:08 PM CST	Tornado Warning Tornado observed	LSX	Randolph	14 min
Feb 28, 8:37 PM CST	Tornado Warning	LSX	Adams, Pike	27 min
Feb 28, 9:07 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	38 min
Feb 28, 9:23 PM CST	Tornado Warning	LSX	Brown, Pike	22 min
Mar 1, 2:15 AM CST	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	34 min
Mar 1, 2:17 AM CST	Special Weather Statement	LSX	Monroe	43 min
Mar 1, 2:39 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Washington	25 min
Feb 28, 6:14 PM CST	Tornado Warning	LSX	Reynolds	30 min
Feb 28, 6:16 PM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	44 min
Feb 28, 6:56 PM CST	Tornado Warning	LSX	Iron, Madison, Reynolds, Saint Francois	34 min
Feb 28, 6:59 PM CST	Severe Thunderstorm Warning	LSX	Iron, Madison, Sainte Genevieve, Saint Francois	46 min
Feb 28, 7:30 PM CST	Tornado Warning	LSX	Madison, Sainte Genevieve, Saint Francois	19 min
Feb 28, 7:57 PM CST	Severe Thunderstorm Warning	LSX	Marion, Monroe, Shelby	48 min
Feb 28, 9:19 PM CST	Severe Thunderstorm Warning	LSX	Madison	17 min
Feb 28, 9:23 PM CST	Tornado Warning	LSX	Madison	11 min
Feb 28, 11:04 PM CST	Severe Thunderstorm Warning	LSX	Boone, Moniteau	41 min
Mar 1, 1:43 AM CST	Special Weather Statement	LSX	Crawford, Franklin, Washington	47 min
Mar 1, 1:56 AM CST	Special Weather Statement	LSX	Saint Louis, City of Saint Louis	34 min
Mar 1, 3:11 AM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	36 min
Mar 1, 3:37 AM CST	Special Weather Statement	LSX	Madison	23 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 Severe Thunderstorm Warnings in Missouri, 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.