Alert archive / Illinois / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 49, NWS St. Louis, MO

April 9, 2015Calhoun County, Greene County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2015, 5:43 PM CDT for Calhoun County, Greene County, Pike County, Illinois. It was in force for 32 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
Apr 9, 2015, 5:43 PM CDT (22:43 UTC)
Expired
Apr 9, 2015, 6:15 PM CDT
In force
32 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

Counties Calhoun County, IL, Greene County, IL, Pike County, IL

The radar

The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 22:45 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.

IssuedProductOfficeLasted
Apr 9, 12:58 PM CDTTornado WatchSPC6 hr
Apr 9, 4:40 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.7 hours before the alert went out and 204 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2015-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 114 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2015-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
114 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
1085 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

660 
WUUS53 KLSX 092243
SVRLSX
ILC013-061-149-092315-
/O.NEW.KLSX.SV.W.0049.150409T2243Z-150409T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
543 PM CDT THU APR 9 2015

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 615 PM CDT

* AT 540 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  CLARKSVILLE...AND MOVING NORTHEAST AT 55 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

  SOURCE...TRAINED WEATHER SPOTTERS.

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
           ROOFS...SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE...
  ATLAS...PLEASANT HILL...BELLEVIEW...SUMMER HILL...MARTINSBURG...
  NEBO...INDEPENDENCE...BEECREEK...TIME...PEARL...MILTON...DETROIT...
  BEDFORD...HILLVIEW...MONTEZUMA AND FLORENCE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

&&

LAT...LON 3968 9063 3954 9057 3953 9058 3940 9050
      3933 9083 3938 9090 3939 9093 3941 9095
      3941 9096 3944 9103 3947 9106 3948 9106
TIME...MOT...LOC 2244Z 247DEG 49KT 3938 9093

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH

$$

CARNEY
2 follow-up statements
162 
WWUS53 KLSX 092306
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
606 PM CDT THU APR 9 2015

ILC013-092316-
/O.CAN.KLSX.SV.W.0049.000000T0000Z-150409T2315Z/
CALHOUN IL-
606 PM CDT THU APR 9 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CALHOUN COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3941 9073 3954 9076 3968 9063 3954 9057
      3953 9058 3940 9050
TIME...MOT...LOC 2306Z 246DEG 51KT 3948 9060

$$

ILC061-149-092315-
/O.CON.KLSX.SV.W.0049.000000T0000Z-150409T2315Z/
PIKE IL-GREENE IL-
606 PM CDT THU APR 9 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
GREENE COUNTY IN SOUTHWEST ILLINOIS...AND SOUTHEASTERN PIKE COUNTY IN
WEST CENTRAL ILLINOIS UNTIL 615 PM CDT...

AT 603 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 10 MILES NORTHEAST
OF BELLEVIEW...AND MOVING NORTHEAST 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...
BEDFORD...HILLVIEW AND MONTEZUMA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

&&

LAT...LON 3941 9073 3954 9076 3968 9063 3954 9057
      3953 9058 3940 9050
TIME...MOT...LOC 2306Z 246DEG 51KT 3948 9060

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH

$$

CARNEY
471 
WWUS53 KLSX 092318
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
618 PM CDT THU APR 9 2015

ILC061-149-092328-
/O.EXP.KLSX.SV.W.0049.000000T0000Z-150409T2315Z/
PIKE IL-GREENE IL-
618 PM CDT THU APR 9 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GREENE COUNTY IN
SOUTHWEST ILLINOIS...AND SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL
ILLINOIS HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 800 PM.

LAT...LON 3941 9073 3954 9076 3968 9063 3954 9057
      3953 9058 3940 9050
TIME...MOT...LOC 2306Z 246DEG 51KT 3948 9060

$$

CARNEY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 9:31 PM CDTRiver Flood WarningLSXFayette5 days
Apr 9, 6:10 AM CDTAreal Flood AdvisoryLSXCalhoun, Jersey, Macoupin, Madison, Monroe, Saint Clair4 hr
Apr 9, 4:48 PM CDTSevere Thunderstorm WarningLSXAdams27 min
Apr 9, 5:19 PM CDTSevere Thunderstorm WarningLSXPike41 min
Apr 9, 6:04 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey, Madison41 min
Apr 9, 6:35 PM CDTSevere Thunderstorm WarningLSXGreene, Jersey, Macoupin, Madison55 min
Apr 9, 6:55 PM CDTSevere Thunderstorm WarningLSXJersey35 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2015Every severe thunderstorm warning in 2015

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.