Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 41, NWS Quad Cities, IA

October 9, 2018Delaware County, Iowa

NWS Quad Cities, IA issued this tornado warning at Oct 9, 2018, 3:09 PM CDT for Delaware County, Iowa. It was in force for 51 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: Oct 9, 2018, 3:09 PM CDT (20:09 UTC)
Expired: Oct 9, 2018, 4:00 PM CDT
In force: 51 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Delaware County, IA

The radar

The Quad Cities radar (KDVN), 116 km from the middle of the area, began a volume at 20:10 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.

Issued	Product	Office	Lasted
Oct 9, 1:46 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.2 hours before the alert went out and 119 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: 459 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1071 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

902 
WFUS53 KDVN 092009
TORDVN
IAC055-092100-
/O.NEW.KDVN.TO.W.0041.181009T2009Z-181009T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
309 PM CDT TUE OCT 9 2018

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Delaware County in northeastern Iowa...

* Until 400 PM CDT.
    
* At 309 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Ryan, or 8 miles south of Manchester, moving north
  at 40 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...
  Delhi and Delaware around 320 PM CDT.
  Manchester and Earlville around 325 PM CDT.
  Oneida around 330 PM CDT.
  Edgewood and Greeley around 335 PM CDT.
  Colesburg around 340 PM CDT.

Other locations impacted by this tornadic thunderstorm include Twin
Bridges Park, Baileys Ford Park, Petersburg, Delaware County
Fairgrounds, Oneida, Turtle Creek Park and Manchester Airport.

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 4230 9140 4231 9150 4264 9150 4265 9125
      4265 9114
TIME...MOT...LOC 2009Z 192DEG 35KT 4236 9144 

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

$$

Wolf

2 follow-up statements

688 
WWUS53 KDVN 092030
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
330 PM CDT TUE OCT 9 2018

IAC055-092100-
/O.CON.KDVN.TO.W.0041.000000T0000Z-181009T2100Z/
Delaware IA-
330 PM CDT TUE OCT 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM CDT FOR
NORTHERN DELAWARE COUNTY...
    
At 329 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Delaware, or near Manchester, moving north at 35
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...
  Greeley around 340 PM CDT.
  Edgewood around 345 PM CDT.
  Colesburg around 350 PM CDT.

Other locations impacted by this tornadic thunderstorm include Oneida
and Twin Bridges Park.

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 4245 9135 4246 9141 4264 9144 4264 9115
      4262 9116
TIME...MOT...LOC 2029Z 194DEG 32KT 4249 9137 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Wolf

357 
WWUS53 KDVN 092055
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
355 PM CDT TUE OCT 9 2018

IAC055-092104-
/O.EXP.KDVN.TO.W.0041.000000T0000Z-181009T2100Z/
Delaware IA-
355 PM CDT TUE OCT 9 2018

...THE TORNADO WARNING FOR NORTHERN DELAWARE COUNTY WILL EXPIRE
AT 400 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 900 PM CDT for northeastern
Iowa.

LAT...LON 4245 9135 4246 9141 4264 9144 4264 9115
      4262 9116
TIME...MOT...LOC 2054Z 192DEG 35KT 4273 9130 

$$

Wolf

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 7:45 PM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Linn	90 min
Oct 8, 8:20 PM CDT	Tornado Warning	DVN	Keokuk	29 min
Oct 8, 9:23 PM CDT	Special Weather Statement	DVN	Buchanan, Delaware	82 min
Oct 8, 10:29 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	46 min
Oct 9, 2:27 AM CDT	Special Weather Statement	DVN	Benton, Buchanan	63 min
Oct 9, 3:42 AM CDT	Flash Flood Watch	DVN	Clinton, Des Moines, Henry, Jackson, Lee, Louisa and 3 more	33 hr
Oct 9, 11:23 AM CDT	River Flood Warning	DVN	Buchanan, Linn	5 days
Oct 9, 11:26 AM CDT	River Flood Warning	DVN	Delaware, Jones	3 days
Oct 9, 12:45 PM CDT	River Flood Warning	DVN	Dubuque, Jackson	6 days
Oct 9, 1:31 PM CDT	River Flood Warning	DVN	Dubuque	16 days
Oct 9, 2:12 PM CDT	Tornado Warning	DVN	Dubuque	48 min
Oct 9, 3:06 PM CDT	Tornado Warning	DVN	Benton, Iowa	39 min
Oct 9, 3:38 PM CDT	Tornado Warning	DVN	Benton, Iowa	52 min
Oct 9, 4:03 PM CDT	Tornado Warning	DVN	Iowa, Keokuk, Washington	27 min
Oct 9, 4:31 PM CDT	Tornado Warning	DVN	Iowa, Johnson	44 min
Oct 9, 5:14 PM CDT	Tornado Warning	DVN	Benton, Iowa, Johnson, Linn	46 min
Oct 9, 5:51 PM CDT	Tornado Warning	DVN	Linn	24 min

Nearby

Tornado Warnings in Iowa, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.