Alert archive / Iowa / Tornado Warnings in 2016

Tornado Warning 20, NWS Des Moines, IA

November 28, 2016Davis County, Iowa

NWS Des Moines, IA issued this tornado warning at Nov 28, 2016, 4:41 PM CST for Davis County, Iowa. It was in force for 13 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: Nov 28, 2016, 4:41 PM CST (22:41 UTC)
Expired: Nov 28, 2016, 4:54 PM CST
In force: 13 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Davis County, IA

The radar

The Des Moines radar (KDMX), 159 km from the middle of the area, began a volume at 22:43 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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.7 hours before the alert went out and 184 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: 666 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 333 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

792 
WFUS53 KDMX 282241
TORDMX
IAC051-282315-
/O.NEW.KDMX.TO.W.0020.161128T2241Z-161128T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
441 PM CST MON NOV 28 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN DAVIS COUNTY IN SOUTHEASTERN IOWA...

* UNTIL 515 PM CST.

* AT 440 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR BLOOMFIELD...MOVING NORTHEAST AT 30 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS...AND VEHICLES. 

* THIS DANGEROUS STORM WILL BE NEAR...
  BLOOMFIELD AROUND 445 PM CST. 

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BLOOMFIELD MUNICIPAL AIRPORT...PULASKI AND FLORIS.

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 4063 9248 4068 9255 4090 9228 4090 9218
      4070 9218
TIME...MOT...LOC 2240Z 236DEG 26KT 4070 9243 

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

$$

BEERENDS

1 follow-up statement

396 
WWUS53 KDMX 282254
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
454 PM CST MON NOV 28 2016

IAC051-282304-
/O.CAN.KDMX.TO.W.0020.000000T0000Z-161128T2315Z/
DAVIS IA-
454 PM CST MON NOV 28 2016

...THE TORNADO WARNING FOR SOUTHEASTERN DAVIS COUNTY 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.

LAT...LON 4063 9248 4068 9255 4090 9228 4090 9218
      4070 9218
TIME...MOT...LOC 2254Z 236DEG 26KT 4076 9231 

$$

BEERENDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 28, 3:13 PM CST	Special Weather Statement	DMX	Grundy	62 min
Nov 28, 3:16 PM CST	Special Weather Statement	DMX	Mahaska	59 min
Nov 28, 3:33 PM CST	Tornado Warning	DMX	Butler, Grundy	27 min
Nov 28, 3:43 PM CST	Tornado Warning	DMX	Grundy	32 min
Nov 28, 3:53 PM CST	Tornado Warning	DMX	Mahaska, Poweshiek	37 min
Nov 28, 3:54 PM CST	Tornado Warning	DMX	Marshall, Tama	18 min
Nov 28, 3:59 PM CST	Tornado Warning	DMX	Bremer, Butler	46 min
Nov 28, 4:19 PM CST	Tornado Warning Tornado observed	DMX	Poweshiek	41 min
Nov 28, 5:11 PM CST	Special Weather Statement	DMX	Wapello	34 min

Nearby

Tornado Warnings in Iowa, 2016 Every tornado warning in 2016 Tornadoes in 2016

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.