Alert archive / Iowa / Tornado Warnings in 2016

Tornado Warning 15, NWS Des Moines, IA

November 28, 2016Grundy County, Iowa

NWS Des Moines, IA issued this tornado warning at Nov 28, 2016, 3:43 PM CST for Grundy County, Iowa. It was in force for 32 min. 1 report 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: Nov 28, 2016, 3:43 PM CST (21:43 UTC)
Expired: Nov 28, 2016, 4:15 PM CST
In force: 32 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Grundy County, IA

The radar

The Des Moines radar (KDMX), 109 km from the middle of the area, began a volume at 21:45 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
Nov 28, 3:50 PM CST	TORNADO	1 W Grundy Center, IA	BRIEF TOUCHDOWN JUST WEST OF TOWN. HAIL REPORTED ON AREA ROAD NEEDED TO BE PLOWED. .

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, 9.7 hours before the alert went out and 201 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.

263 
WFUS53 KDMX 282143
TORDMX
IAC075-282215-
/O.NEW.KDMX.TO.W.0015.161128T2143Z-161128T2215Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL GRUNDY COUNTY IN CENTRAL IOWA...

* UNTIL 415 PM CST.

* AT 342 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER GRUNDY CENTER...MOVING NORTHEAST AT 20
  MPH.

  HAZARD...TORNADO. 

  SOURCE...WEATHER SPOTTERS REPORTED FUNNEL CLOUD. AT 340PM...A 
           FUNNEL CLOUD WAS REPORTED NEARLY TO THE GROUND ABOUT 2 
           MILES SOUTHWEST OF GRUNDY CENTER.   

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

* THIS DANGEROUS STORM WILL BE NEAR...
  GRUNDY CENTER AROUND 355 PM CST. 
  DIKE AROUND 415 PM CST. 

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
MORRISON AND HOLLAND.

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 4231 9283 4238 9290 4252 9267 4235 9253
      4234 9254
TIME...MOT...LOC 2142Z 236DEG 16KT 4235 9282 

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

$$

MF

3 follow-up statements

382 
WWUS53 KDMX 282146
SVSDMX

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

IAC075-282215-
/O.CON.KDMX.TO.W.0015.000000T0000Z-161128T2215Z/
GRUNDY IA-
346 PM CST MON NOV 28 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CST FOR CENTRAL
GRUNDY COUNTY...
    
AT 346 PM CST...A CONFIRMED TORNADO WAS LOCATED OVER GRUNDY CENTER...
MOVING NORTHEAST AT 20 MPH.

HAZARD...TORNADO. 

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. AT 345PM SPOTTER 
         REPORTED A TORNADO ON THE GROUND NEAR GRUNDY CENTER. 

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

THIS TORNADO WILL BE NEAR...
  GRUNDY CENTER AROUND 355 PM CST. 
  DIKE AROUND 415 PM CST. 

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
MORRISON AND HOLLAND.

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 4231 9283 4238 9290 4252 9267 4235 9253
      4234 9254
TIME...MOT...LOC 2146Z 236DEG 16KT 4236 9280 

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

$$

MF

794 
WWUS53 KDMX 282202
SVSDMX

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

IAC075-282215-
/O.CON.KDMX.TO.W.0015.000000T0000Z-161128T2215Z/
GRUNDY IA-
402 PM CST MON NOV 28 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CST FOR
NORTHEASTERN GRUNDY COUNTY...
    
AT 402 PM CST...A CONFIRMED TORNADO WAS LOCATED NEAR DIKE...OR NEAR
GRUNDY CENTER...MOVING NORTHEAST AT 40 MPH.

HAZARD...TORNADO. 

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. 

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

THIS TORNADO WILL BE NEAR...
  DIKE AROUND 410 PM CST. 

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
MORRISON.

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 4231 9280 4246 9277 4252 9267 4235 9253
      4234 9254
TIME...MOT...LOC 2202Z 219DEG 34KT 4245 9271 

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

$$

MF

364 
WWUS53 KDMX 282215
SVSDMX

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

IAC075-282225-
/O.EXP.KDMX.TO.W.0015.000000T0000Z-161128T2215Z/
GRUNDY IA-
415 PM CST MON NOV 28 2016

...THE TORNADO WARNING FOR NORTHEASTERN GRUNDY COUNTY HAS EXPIRED...
                
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 ALLOWED TO EXPIRE.  HOWEVER GUSTY
WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4231 9280 4246 9277 4252 9267 4235 9253
      4234 9254
TIME...MOT...LOC 2215Z 236DEG 16KT 4248 9265 

$$

MF

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, 3:53 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, 4:41 PM CST	Tornado Warning	DMX	Davis	13 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.