Alert archive / Illinois / Tornado Warnings in 2015

Tornado Warning 20, NWS Quad Cities, IA

July 16, 2015Rock Island County, Whiteside County, Illinois

NWS Quad Cities, IA issued this tornado warning at Jul 16, 2015, 6:57 PM CDT for Rock Island County, Whiteside County, Illinois. It was in force for 36 min. 4 reports 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: Jul 16, 2015, 6:57 PM CDT (23:57 UTC)
Expired: Jul 16, 2015, 7:33 PM CDT
In force: 36 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Rock Island County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 32 km from the middle of the area, began a volume at 23:58 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
Jul 16, 7:10 PM CDT	TSTM WND DMG	Port Byron, IL	PROPERTY AND TREE DAMAGE NEAR 94TH AVE IN PORT BYRON - REPORT VIA SOCIAL MEDIA
Jul 16, 7:10 PM CDT	TORNADO 1	1 E Port Byron, IL	PROPERTY AND TREE DAMAGE ALONG 94TH AVE. RATING EF-1. ESTIMATED PEAK WIND 105 MPH. PATH LENGTH 1.2 MILES. MAX WIDTH 200 YARDS. START TIME 700 PM CDT. START LOCATION 0.8 NE PORT BYRON IL. END TIME 710 PM CDT. END LOCATION 2 NE PORT BYRON IL. BROADCAST MEDIA ORI
Jul 16, 7:10 PM CDT	TORNADO	1 E Port Byron, IL	PROPERTY AND TREE DAMAGE ALONG 94TH AVE.
Jul 16, 7:10 PM CDT	TORNADO	1 E Port Byron, IL	PROPERTY AND TREE DAMAGE ON 94TH AVE...TIME ESTIMATED FROM RADAR.

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 12:00Z, 12.0 hours before the alert went out and 25 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1260 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 229 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.

007 
WFUS53 KDVN 162357
TORDVN
ILC161-195-170045-
/O.NEW.KDVN.TO.W.0020.150716T2357Z-150717T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
657 PM CDT THU JUL 16 2015

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN ROCK ISLAND COUNTY IN NORTHWESTERN ILLINOIS...
  WESTERN WHITESIDE COUNTY IN NORTHWESTERN ILLINOIS...

* UNTIL 745 PM CDT
    
* AT 657 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR PORT BYRON...OR 11 MILES NORTHEAST OF
  BETTENDORF...MOVING NORTHEAST AT 25 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  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. 

* THIS DANGEROUS STORM WILL BE NEAR...
  ERIE AND ALBANY AROUND 720 PM CDT.
  GARDEN PLAIN AROUND 730 PM CDT.
  PROPHETSTOWN AROUND 740 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
HAMILTON CORNERS...DENROCK...PORTLAND CORNERS...HILLSDALE...JOSLIN...
SPRING HILL...NEWTON CORNERS AND FENTON.

THIS INCLUDES INTERSTATE 88 BETWEEN MILE MARKERS 3 AND 25.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4162 8989 4158 9005 4158 9018 4156 9018
      4153 9029 4158 9036 4159 9034 4165 9034
      4168 9033 4169 9031 4172 9032 4186 9009
TIME...MOT...LOC 2357Z 232DEG 20KT 4163 9028 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

12

2 follow-up statements

342 
WWUS53 KDVN 170020
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
720 PM CDT THU JUL 16 2015

ILC161-195-170045-
/O.CON.KDVN.TO.W.0020.000000T0000Z-150717T0045Z/
ROCK ISLAND IL-WHITESIDE IL-
720 PM CDT THU JUL 16 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHEASTERN ROCK ISLAND AND WESTERN WHITESIDE COUNTIES...
    
AT 719 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER ERIE...OR 14 MILES SOUTHWEST OF MORRISON...MOVING
NORTHEAST AT 25 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

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. 

THIS DANGEROUS STORM WILL BE NEAR...
  PROPHETSTOWN AROUND 745 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
HAMILTON CORNERS...DENROCK...PORTLAND CORNERS...HILLSDALE...SPRING
HILL...NEWTON CORNERS AND FENTON.

THIS INCLUDES INTERSTATE 88 BETWEEN MILE MARKERS 7 AND 25.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4162 8989 4158 9005 4158 9018 4156 9018
      4156 9023 4160 9025 4166 9029 4169 9029
      4172 9028 4186 9009
TIME...MOT...LOC 0019Z 246DEG 19KT 4164 9011 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

12

040 
WWUS53 KDVN 170033
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
733 PM CDT THU JUL 16 2015

ILC161-195-170043-
/O.CAN.KDVN.TO.W.0020.000000T0000Z-150717T0045Z/
ROCK ISLAND IL-WHITESIDE IL-
733 PM CDT THU JUL 16 2015

...THE TORNADO WARNING FOR NORTHEASTERN ROCK ISLAND AND WESTERN
WHITESIDE COUNTIES IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER GUSTY WINDS AND
HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
NORTHWESTERN ILLINOIS.

LAT...LON 4162 8989 4158 9005 4158 9018 4156 9018
      4156 9023 4160 9025 4166 9029 4169 9029
      4172 9028 4186 9009
TIME...MOT...LOC 0029Z 232DEG 20KT 4169 9003 

$$

12

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 3:54 AM CDT	Flash Flood Watch	DVN	Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 4 more	21 hr
Jul 16, 6:47 AM CDT	Special Weather Statement	DVN	Hancock, Henderson, McDonough, Mercer, Warren	88 min
Jul 16, 5:32 PM CDT	Severe Thunderstorm Warning	DVN	Henderson	43 min
Jul 16, 5:45 PM CDT	Tornado Warning	DVN	Henderson	45 min
Jul 16, 6:17 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, Mercer, Warren	43 min
Jul 16, 6:35 PM CDT	Tornado Warning	DVN	Henderson, Warren	55 min

Nearby

Tornado Warnings in Illinois, 2015 Every tornado warning in 2015 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.