Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 7, NWS Des Moines, IA

March 6, 2017Appanoose County, Wayne County, Iowa

NWS Des Moines, IA issued this tornado warning at Mar 6, 2017, 8:22 PM CST for Appanoose County, Wayne County, Iowa. It was in force for 23 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
Mar 6, 2017, 8:22 PM CST (02:22 UTC)
Expired
Mar 6, 2017, 8:45 PM CST
In force
23 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Appanoose County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 126 km from the middle of the area, began a volume at 02:22 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 6, 8:30 PM CSTTORNADO2 Se Centerville, IAUNCONFIRMED TORNADO. REPORT OF DAMAGE TO INDUSTRIAL BUILDINGS. POWER POLES SNAPPED. SEMI TRUCKS BLOWN OVER. .
Mar 6, 8:32 PM CSTTSTM WND DMG1 Sse Centerville, IASEMI AND CAMPER FLIPPED OVER. POWER POLES SNAPPED OFF. .
Mar 6, 8:32 PM CSTTSTM WND DMG1 W Seymour, IAPOWER OUT 1W OF SEYMOUR. VERY STRONG WINDS AND HEAVY RAINFALL. .

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.

IssuedProductOfficeLasted
Mar 6, 1:54 PM CSTTornado WatchSPC8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.4 hours before the alert went out and 233 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 2017-03-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 39 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 2017-03-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 407 square meters per square second.1939587897Sfc1 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
39 J/kg
Mixed-layer CIN
-343 J/kg
Mixed-layer LCL
1016 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
407 m²/s²
0-3 km storm-relative helicity
489 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

063 
WFUS53 KDMX 070222
TORDMX
IAC007-185-070245-
/O.NEW.KDMX.TO.W.0007.170307T0222Z-170307T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
822 PM CST MON MAR 6 2017

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southeastern Wayne County in south central Iowa...
  Appanoose County in south central Iowa...

* Until 845 PM CST.

* At 822 PM CST, a severe thunderstorm capable of producing a tornado
  was located 11 miles west of Centerville, moving northeast at 70
  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...
  Centerville around 835 PM CST. 

Other locations impacted by this tornadic thunderstorm include
Rathbun, Mystic, Honey Creek State Park, Cincinnati, Promise City,
Exline, Sharon Bluffs State Park, Seymour, Numa and Plano.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4071 9321 4090 9301 4090 9288 4059 9265
      4058 9313
TIME...MOT...LOC 0222Z 239DEG 60KT 4070 9309 

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

$$

Small
1 follow-up statement
977 
WWUS53 KDMX 070231 RRA
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
831 PM CST MON MAR 6 2017

IAC185-070241-
/O.CAN.KDMX.TO.W.0007.000000T0000Z-170307T0245Z/
Wayne IA-
831 PM CST MON MAR 6 2017

...THE TORNADO WARNING FOR SOUTHEASTERN WAYNE COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CST for south central
Iowa.

LAT...LON 4073 9305 4085 9298 4090 9288 4059 9265
      4058 9292
TIME...MOT...LOC 0231Z 238DEG 55KT 4068 9290 

$$

IAC007-070245-
/O.CON.KDMX.TO.W.0007.000000T0000Z-170307T0245Z/
Appanoose IA-
831 PM CST MON MAR 6 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CST FOR CENTRAL
APPANOOSE COUNTY...
    
At 831 PM CST, a severe thunderstorm capable of producing a tornado
was located near Centerville, moving northeast at 65 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 tornadic thunderstorm will remain over mainly rural areas of
central Appanoose County, including the following locations: Rathbun,
Mystic, Honey Creek State Park, Cincinnati, Exline, Sharon Bluffs
State Park, Numa and Centerville Municipal 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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4073 9305 4085 9298 4090 9288 4059 9265
      4058 9292
TIME...MOT...LOC 0231Z 238DEG 55KT 4068 9290 

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

$$

Small

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 6, 6:03 PM CSTSevere Thunderstorm WarningDMXAdair, Boone, Cass, Dallas, Greene, Guthrie and 1 more42 min
Mar 6, 6:09 PM CSTSevere Thunderstorm WarningDMXFranklin, Hamilton, Hardin, Wright51 min
Mar 6, 6:30 PM CSTSevere Thunderstorm WarningDMXAdair, Boone, Dallas, Madison, Polk, Story and 1 more45 min
Mar 6, 6:31 PM CSTSevere Thunderstorm WarningDMXCerro Gordo29 min
Mar 6, 6:39 PM CSTSevere Thunderstorm WarningDMXClarke, Union51 min
Mar 6, 7:07 PM CSTSevere Thunderstorm WarningDMXJasper, Marshall, Polk, Story53 min
Mar 6, 7:07 PM CSTSevere Thunderstorm WarningDMXButler, Franklin, Grundy, Hardin, Marshall37 min
Mar 6, 7:12 PM CSTSevere Thunderstorm WarningDMXMarion, Warren48 min
Mar 6, 7:21 PM CSTSevere Thunderstorm WarningDMXClarke, Lucas, Monroe54 min
Mar 6, 7:21 PM CSTTornado WarningDMXMarion, Warren24 min
Mar 6, 7:31 PM CSTSevere Thunderstorm WarningDMXDecatur, Wayne59 min
Mar 6, 7:32 PM CSTSevere Thunderstorm WarningDMXBlack Hawk, Bremer, Butler, Grundy58 min
Mar 6, 7:40 PM CSTSevere Thunderstorm WarningDMXJasper, Marshall, Poweshiek, Tama54 min
Mar 6, 7:40 PM CSTTornado Warning Tornado observedDMXJasper, Mahaska, Marion22 min
Mar 6, 7:43 PM CSTTornado WarningDMXJasper, Poweshiek32 min
Mar 6, 7:51 PM CSTSevere Thunderstorm WarningDMXMahaska, Marion54 min
Mar 6, 7:56 PM CSTTornado Warning Tornado observedDMXWayne34 min
Mar 6, 8:08 PM CSTSevere Thunderstorm WarningDMXAppanoose, Lucas, Monroe, Wayne35 min
Mar 6, 8:38 PM CSTSevere Thunderstorm WarningDMXAppanoose, Davis, Monroe, Wapello41 min
Mar 6, 8:40 PM CSTTornado WarningDMXAppanoose, Davis, Monroe, Wapello35 min
Mar 7, 4:00 AM CSTRed Flag WarningDMXAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more14 hr
Mar 7, 10:40 AM CSTRiver Flood WarningDMXBlack Hawk4 days

Nearby

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