Alert archive / Illinois / Tornado Warnings in 2015

Tornado Warning 9, NWS Quad Cities, IA

May 24, 2015Mercer County, Rock Island County, Illinois

NWS Quad Cities, IA issued this tornado warning at May 24, 2015, 7:04 PM CDT for Mercer County, Rock Island County, Illinois. It was in force for 26 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
May 24, 2015, 7:04 PM CDT (00:04 UTC)
Expired
May 24, 2015, 7:30 PM CDT
In force
26 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Tornado
Observed
Hail
0.75 in

Counties Mercer County, IL, Rock Island County, IL

The radar

The Quad Cities radar (KDVN), 18 km from the middle of the area, began a volume at 00:04 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
May 24, 5:34 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.1 hours before the alert went out and 20 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 2015-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 210 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2015-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 square meters per square second.193958Sfc1 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
210 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1061 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.2
Supercell composite
6.0

Open this sounding in Storm Lab

The text

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

783 
WFUS53 KDVN 250004
TORDVN
ILC131-161-250030-
/O.NEW.KDVN.TO.W.0009.150525T0004Z-150525T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
704 PM CDT SUN MAY 24 2015

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES  HAS ISSUED A

* TORNADO WARNING FOR...
  ROCK ISLAND COUNTY IN NORTHWESTERN ILLINOIS...
  NORTHWESTERN MERCER COUNTY IN NORTHWESTERN ILLINOIS...

* UNTIL 730 PM CDT

* AT 702 PM CDT...A CONFIRMED TORNADO WAS LOCATED 5 MILES SOUTH OF 
  ILLINOIS CITY...MOVING NORTHEAST AT 45 MPH.

  HAZARD...DAMAGING TORNADO. 

  SOURCE...TRAINED WEATHER SPOTTERS CONFIRMED TORNADO. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THE TORNADO WILL BE NEAR...
  HAMLET AROUND 710 PM CDT.
  ANDALUSIA...REYNOLDS AND TAYLOR RIDGE AROUND 715 PM CDT.
  BUFFALO AROUND 720 PM CDT.
  MILAN AND OAK GROVE AROUND 725 PM CDT.
  MOLINE...ROCK ISLAND...EAST MOLINE...SILVIS...COAL VALLEY AND
  RIVERDALE AROUND 730 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE SILVIS
HEIGHTS...COYNE CENTER...INDIAN BLUFF PARK...PREEMPTION...MARSTON...
ROCK ISLAND ARSENAL...FRUITLAND...EDGINGTON...MOLINE QUAD-CITY
AIRPORT AND PETERSVILLE.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 74 IN ILLINOIS BETWEEN MILE MARKERS 1 AND 8.
 INTERSTATE 280 BETWEEN MILE MARKERS 10 AND 18.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW! MOVE TO A
BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A MOBILE HOME...OR
IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4146 9041 4146 9043 4135 9043 4119 9090
      4135 9102 4146 9082 4145 9073 4146 9066
      4151 9059 4153 9055 4152 9051 4152 9047
      4155 9043 4148 9038
TIME...MOT...LOC 0002Z 240DEG 38KT 4133 9084 

TORNADO...OBSERVED
HAIL...<.75IN

$$

UTTECH
1 follow-up statement
932 
WWUS53 KDVN 250028
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
728 PM CDT SUN MAY 24 2015

ILC131-161-250036-
/O.EXP.KDVN.TO.W.0009.000000T0000Z-150525T0030Z/
ROCK ISLAND IL-MERCER IL-
728 PM CDT SUN MAY 24 2015

...THE TORNADO WARNING FOR ROCK ISLAND AND NORTHWESTERN MERCER
COUNTIES WILL EXPIRE AT 730 PM CDT...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED NORTH 
OUT OF THE WARNED AREA. THEREFORE THE WARNING WILL BE ALLOWED TO 
EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FOR NORTHWESTERN
ILLINOIS AND EAST CENTRAL IOWA.

LAT...LON 4146 9041 4146 9043 4135 9043 4119 9090
      4135 9102 4146 9082 4145 9073 4146 9066
      4151 9059 4153 9055 4152 9051 4152 9047
      4155 9043 4148 9038
TIME...MOT...LOC 0023Z 240DEG 38KT 4133 9084 

$$

Nearby

Tornado Warnings in Illinois, 2015Every tornado warning in 2015Tornadoes 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.