Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS Quad Cities, IA

March 18, 2012Warren County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Mar 18, 2012, 1:06 AM CDT for Warren County, Illinois. It was in force for 39 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
Mar 18, 2012, 1:06 AM CDT (06:06 UTC)
Expired
Mar 18, 2012, 1:45 AM CDT
In force
39 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
58.0 mph

County Warren County, IL

The radar

The Quad Cities radar (KDVN), 104 km from the middle of the area, began a volume at 06:06 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

TimeReportWhereRemark
Mar 18, 1:30 AM CDTHAIL 1.251 W Greenbush, ILREPORT OF QUARTER TO HALF DOLLAR SIZE HAIL. REPORT RELAYED FROM NWS LINCOLN OFFICE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.1 hours before the alert went out and 104 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, Davenport, at 00:00Z on 2012-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 985 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, Davenport, at 00:00Z on 2012-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 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
985 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1675 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

589 
WUUS53 KDVN 180606
SVRDVN
ILC187-180645-
/O.NEW.KDVN.SV.W.0002.120318T0606Z-120318T0645Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
106 AM CDT SUN MAR 18 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN WARREN COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 145 AM CDT.

* AT 102 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED APPROXIMATELY NEAR LITTLE SWAN LAKE...OR 15 MILES
  NORTH OF MACOMB...AND MOVING NORTHEAST AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  GREENBUSH...BERWICK AND CAMERON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

&&

LAT...LON 4063 9053 4063 9066 4072 9075 4096 9044
      4063 9044 4062 9046 4063 9052
TIME...MOT...LOC 0606Z 231DEG 20KT 4068 9057
WIND...HAIL <58MPH 1.00IN

$$

12
2 follow-up statements
634 
WWUS53 KDVN 180627
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
127 AM CDT SUN MAR 18 2012

ILC187-180645-
/O.CON.KDVN.SV.W.0002.000000T0000Z-120318T0645Z/
WARREN IL-
127 AM CDT SUN MAR 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR SOUTHEASTERN WARREN COUNTY...

AT 123 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED APPROXIMATELY NEAR GREENBUSH...OR 16
MILES SOUTHEAST OF MONMOUTH...MOVING NORTHEAST AT 25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BERWICK
AND CAMERON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

&&

LAT...LON 4063 9052 4063 9060 4074 9066 4096 9044
      4063 9044 4063 9045 4063 9049
TIME...MOT...LOC 0626Z 231DEG 20KT 4072 9051
WIND...HAIL <58MPH 1.00IN

$$

12
549 
WWUS53 KDVN 180649
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
149 AM CDT SUN MAR 18 2012

ILC187-180657-
/O.EXP.KDVN.SV.W.0002.000000T0000Z-120318T0645Z/
WARREN IL-
149 AM CDT SUN MAR 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN COUNTY HAS
EXPIRED...

THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER HAS
WEAKENED. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED 
TO EXPIRE. HOWEVER...THIS STORM MAY STILL BE ABLE TO PRODUCE HAIL UP 
TO THE SIZE OF PENNIES JUST EAST OF BERWICK AND SOUTH OF CAMERON 
THROUGH 2 AM CDT.

LAT...LON 4063 9052 4063 9060 4074 9066 4096 9044
      4063 9044 4063 9045 4063 9049
TIME...MOT...LOC 0627Z 231DEG 20KT 4072 9050

$$

12

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 18, 12:43 AM CDTSevere Thunderstorm WarningDVNMcDonough47 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2012Every severe thunderstorm warning in 2012

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.