Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 33, NWS Quad Cities, IA

May 17, 20174 counties in Iowa

NWS Quad Cities, IA issued this tornado warning at May 17, 2017, 6:32 PM CDT for 4 counties in Iowa. It was in force for 43 min. 3 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: May 17, 2017, 6:32 PM CDT (23:32 UTC)
Expired: May 17, 2017, 7:15 PM CDT
In force: 43 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

Counties Delaware County, IA, Dubuque County, IA, Jones County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 99 km from the middle of the area, began a volume at 23:31 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
May 17, 6:51 PM CDT	TSTM WND GST 75	Oneida, IA
May 17, 6:57 PM CDT	TSTM WND GST 72	Sw Dyersville, IA
May 17, 7:00 PM CDT	TSTM WND DMG	2 Wsw New Vienna, IA	SEVERAL FARM BUILDINGS DAMAGED NEAR DYERSVILLE

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 17, 3:44 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 hours before the alert went out and 102 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: 103 J/kg
Mixed-layer CIN: -348 J/kg
Mixed-layer LCL: 1223 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

988 
WFUS53 KDVN 172332
TORDVN
IAC055-061-105-113-180015-
/O.NEW.KDVN.TO.W.0033.170517T2332Z-170518T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
632 PM CDT WED MAY 17 2017

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northwestern Dubuque County in northeastern Iowa...
  Northwestern Jones County in east central Iowa...
  Eastern Delaware County in northeastern Iowa...
  Northeastern Linn County in east central Iowa...

* Until 715 PM CDT

* At 632 PM CDT, a confirmed tornado was located over Waubeek, or 9
  miles west of Anamosa, moving northeast at 60 mph.

  HAZARD...Damaging tornado. 

  SOURCE...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...
  Ryan around 645 PM CDT. 
  Hopkinton and Delhi around 650 PM CDT. 
  Earlville, Delaware and Oneida around 655 PM CDT. 
  Dyersville, New Vienna and Greeley around 700 PM CDT. 
  Colesburg and Luxemburg around 705 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Pinicon Ridge Park, Twin Bridges Park, Buck Creek, Baileys Ford Park,
Petersburg, Matsell Bridge Natural Area, Howard H Cherry Scout
Reservation, Oneida, New Wine Park and Turtle Creek Park.

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 4204 9138 4211 9160 4265 9133 4265 9099
TIME...MOT...LOC 2332Z 203DEG 60KT 4214 9146 

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

$$

Gibbs

1 follow-up statement

162 
WWUS53 KDVN 180007 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
707 PM CDT WED MAY 17 2017

IAC055-061-105-113-180017-
/O.EXP.KDVN.TO.W.0033.000000T0000Z-170518T0015Z/
Dubuque IA-Jones IA-Delaware IA-Linn IA-
707 PM CDT WED MAY 17 2017

...THE TORNADO WARNING FOR NORTHWESTERN DUBUQUE...NORTHWESTERN
JONES...EASTERN DELAWARE AND NORTHEASTERN LINN COUNTIES WILL EXPIRE
AT 715 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 1100 PM CDT for northeastern
and east central Iowa.

Remember, a Severe Thunderstorm Warning still remains in effect for
Dubuque, Delaware, Jones and Linn Counties until 730 PM CDT.

LAT...LON 4204 9138 4211 9160 4265 9133 4265 9099
TIME...MOT...LOC 0007Z 203DEG 60KT 4264 9117 

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 1:23 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Jones and 3 more	37 min
May 17, 8:50 AM CDT	Special Weather Statement	DVN	Scott	25 min
May 17, 3:16 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Linn	43 min
May 17, 3:36 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones, Linn	54 min
May 17, 3:38 PM CDT	Tornado Warning	DVN	Jefferson, Keokuk, Washington	52 min
May 17, 3:45 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee, Van Buren	30 min
May 17, 3:49 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Van Buren, Washington	41 min
May 17, 3:55 PM CDT	Tornado Warning	DVN	Des Moines, Henry, Lee, Louisa, Van Buren	50 min
May 17, 4:23 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Washington	44 min
May 17, 4:40 PM CDT	Tornado Warning	DVN	Des Moines, Henry, Louisa, Muscatine	50 min
May 17, 5:03 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Keokuk	57 min
May 17, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Muscatine, Scott	30 min
May 17, 5:39 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Keokuk, Van Buren, Washington	66 min
May 17, 5:50 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn and 1 more	55 min
May 17, 5:54 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	51 min
May 17, 6:01 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Lee, Van Buren	59 min
May 17, 6:19 PM CDT	Tornado Warning	DVN	Johnson, Louisa, Washington	41 min
May 17, 6:28 PM CDT	Flash Flood Warning	DVN	Johnson, Linn	3 hr
May 17, 6:31 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Cedar, Clinton, Delaware, Dubuque, Jackson and 5 more	59 min
May 17, 6:38 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Louisa, Muscatine, Washington	52 min
May 17, 6:48 PM CDT	Tornado Warning	DVN	Cedar, Johnson, Muscatine	42 min

Nearby

Tornado Warnings in Iowa, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.