Alert archive / Illinois / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 182, NWS St. Louis, MO

August 12, 2007Adams County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 12, 2007, 10:50 PM CDT for Adams County, Pike County, Illinois. It was in force for 55 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: Aug 12, 2007, 10:50 PM CDT (03:50 UTC)
Expired: Aug 12, 2007, 11:45 PM CDT
In force: 55 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

Counties Adams County, IL, Pike County, IL

The radar

The St Louis radar (KLSX), 138 km from the middle of the area, began a volume at 03:50 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
Aug 12, 10:55 PM CDT	TSTM WND DMG	Quincy, IL	LARGE TREE LIMBS DOWN WITHIN THE CITY

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
Aug 12, 9:23 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.8 hours before the alert went out and 200 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: 2394 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1111 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -3.3

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 130350
SVRLSX
ILC001-149-130445-
/O.NEW.KLSX.SV.W.0182.070813T0350Z-070813T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1050 PM CDT SUN AUG 12 2007

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1145 PM CDT

* AT 1045 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 11 MILES NORTHWEST OF MENDON TO 17 MILES SOUTHWEST OF FALL
  CREEK...OR ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF
  CANTON TO 7 MILES EAST OF MONROE CITY...AND MOVING EAST
  SOUTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  QUINCY...
  MENDON...
  FALL CREEK...
  PAYSON...
  CAMP POINT...
  GOLDEN...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
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.

LAT...LON 4022 9149 4008 9151 3993 9145 3969 9136
      3943 9095 3942 9063 3982 9062 3986 9091
      4019 9092

$$

GKS

1 follow-up statement

000 
WWUS53 KLSX 130419
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1119 PM CDT SUN AUG 12 2007

ILC001-149-130445-
/O.CON.KLSX.SV.W.0182.000000T0000Z-070813T0445Z/
PIKE IL-ADAMS IL-
1119 PM CDT SUN AUG 12 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR ADAMS AND PIKE COUNTIES IN WEST CENTRAL ILLINOIS...

AT 1115 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM GOLDEN TO 16 MILES SOUTHWEST OF ROCKPORT...OR ALONG A
LINE EXTENDING FROM 20 MILES NORTHEAST OF QUINCY TO 8 MILES NORTHWEST
OF BOWLING GREEN...MOVING SOUTHEAST AT 30 MPH.

LOCATIONS NEAR THE PATH OF SEVERE THUNDERSTORMS INCLUDE...NEW
CANTON...CLAYTON...KINGSTON...BARRY...BEVERLY...KELLERVILLE...EL
DARA...ROCKPORT AND BAYLIS.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
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.

WIND DAMAGE WITH THIS STORM WILL OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

LAT...LON 4019 9092 3985 9092 3982 9062 3976 9062
      3971 9065 3965 9062 3943 9063 3944 9094
      3973 9136 3980 9138 3987 9145 3994 9143
      4001 9149 4020 9150

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 11:25 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	65 min
Aug 12, 11:46 PM CDT	Severe Thunderstorm Warning	LSX	Pike	44 min
Aug 12, 11:58 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey	77 min
Aug 13, 12:20 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison, Monroe, Saint Clair	70 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2007 Every severe thunderstorm warning in 2007

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.