Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 9, NWS St. Louis, MO

February 27, 2011Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 27, 2011, 10:30 PM CST for Pike County, Illinois. It was in force for 18 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: Feb 27, 2011, 10:30 PM CST (04:30 UTC)
Expired: Feb 27, 2011, 10:48 PM CST
In force: 18 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

County Pike County, IL

The radar

The St Louis radar (KLSX), 112 km from the middle of the area, began a volume at 04:31 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 nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.5 hours before the alert went out and 192 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: 124 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

801 
WUUS53 KLSX 280430
SVRLSX
ILC149-280515-
/O.NEW.KLSX.SV.W.0009.110228T0430Z-110228T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1030 PM CST SUN FEB 27 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 1115 PM CST

* AT 1027 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR
  PITTSFIELD...AND MOVING NORTHEAST AT 70 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GRIGGSVILLE...MILTON...DETROIT...PERRY...VALLEY CITY AND
  CHAMBERSBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3971 9064 3969 9064 3950 9059 3947 9085
      3968 9097 3976 9100 3977 9092 3979 9092
      3985 9073 3984 9059
TIME...MOT...LOC 0430Z 245DEG 64KT 3965 9077
WIND...HAIL 70MPH 1.00IN

$$

GKS

1 follow-up statement

798 
WWUS53 KLSX 280448
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1048 PM CST SUN FEB 27 2011

ILC149-280457-
/O.CAN.KLSX.SV.W.0009.000000T0000Z-110228T0515Z/
PIKE IL-
1048 PM CST SUN FEB 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PIKE COUNTY IN WEST
CENTRAL ILLINOIS IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THE THUNDERSTORMS 
LATE THIS EVENING.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.

LAT...LON 3971 9064 3969 9064 3950 9059 3947 9085
      3968 9097 3976 9100 3977 9092 3979 9092
      3985 9073 3984 9059
TIME...MOT...LOC 0447Z 245DEG 64KT 3978 9041

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 27, 6:26 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	49 min
Feb 27, 7:38 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	37 min
Feb 27, 8:02 PM CST	Tornado Warning	LSX	Pike	28 min
Feb 27, 8:14 PM CST	Severe Thunderstorm Warning	LSX	Brown	16 min
Feb 27, 8:25 PM CST	Severe Thunderstorm Warning	LSX	Calhoun, Pike	35 min
Feb 27, 9:50 PM CST	Severe Thunderstorm Warning	LSX	Adams, Pike	40 min
Feb 27, 10:47 PM CST	Tornado Warning	LSX	Monroe, Saint Clair	43 min
Feb 27, 11:18 PM CST	Tornado Warning	LSX	Madison, Monroe, Saint Clair	42 min
Feb 27, 11:43 PM CST	Tornado Warning	LSX	Bond, Clinton, Fayette, Madison, Saint Clair, Washington	47 min
Feb 28, 12:07 AM CST	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion, Washington	38 min
Feb 28, 12:23 AM CST	Severe Thunderstorm Warning	LSX	Randolph	52 min
Feb 28, 2:19 AM CST	River Flood Warning	LSX	Jersey	4 days
Feb 28, 6:46 AM CST	River Flood Warning	LSX	Pike	29 hr
Feb 28, 6:46 AM CST	River Flood Warning	LSX	Pike	38 hr
Feb 28, 6:46 AM CST	River Flood Warning	LSX	Calhoun	52 hr
Feb 28, 11:14 AM CST	River Flood Warning	LSX	Morgan, Pike	17 days
Feb 28, 11:43 AM CST	River Flood Warning	LSX	Calhoun	47 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2011 Every severe thunderstorm warning in 2011

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.