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March 20-23 Severe Threat


Jim Martin

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE DES MOINES IA

550 PM CDT TUE MAR 22 2011

IAC001-121-222330-

/O.CON.KDMX.TO.W.0006.000000T0000Z-110322T2330Z/

ADAIR IA-MADISON IA-

550 PM CDT TUE MAR 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR MADISON AND ADAIR COUNTIES

UNTIL 630 PM CDT...

AT 547 PM CDT...EMERGENCY MANAGEMENT REPORTED A POSSIBLE TORNADO.

THIS TORNADO COULD BE RAIN-WRAPPED AND WAS LOCATED NEAR

GREENFIELD...OR 16 MILES NORTHWEST OF CRESTON...MOVING EAST AT 50

MPH.

LOCATIONS IMPACTED INCLUDE...

WINTERSET...MACKSBURG...EAST PERU...TRURO...PATTERSON AND ST.

CHARLES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...

OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM

WINDOWS.

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IAC003-175-222330-

/O.CON.KDMX.TO.W.0007.000000T0000Z-110322T2330Z/

UNION IA-ADAMS IA-

611 PM CDT TUE MAR 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN ADAMS AND UNION

COUNTIES UNTIL 630 PM CDT...

AT 610 PM CDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO. THIS

TORNADO WAS LOCATED 6 MILES SOUTHWEST OF CRESTON...MOVING NORTHEAST

AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...

CRESTON...CRESTON AIRPORT...ARISPE...AFTON...LORIMOR AND THAYER.

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TOG headed into Des Moines.

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE DES MOINES IA

626 PM CDT TUE MAR 22 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...

SOUTHEASTERN DALLAS COUNTY IN CENTRAL IOWA...

NORTHERN MADISON COUNTY IN SOUTH CENTRAL IOWA...

SOUTHERN POLK COUNTY IN CENTRAL IOWA...

NORTHERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 715 PM CDT

* AT 624 PM CDT...EMERGENCY MANAGEMENT REPORTED A TORNADO 6 MILES

NORTHWEST OF WINTERSET...OR 27 MILES SOUTHWEST OF DES MOINES.

DOPPLER RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...

DES MOINES...WEST DES MOINES...NORWALK...WINDSOR HEIGHTS...

CARLISLE...PLEASANT HILL...ALTOONA...BONDURANT...VAN METER...

MARTENSDALE...CUMMING...SPRING HILL...DES MOINES INT AIRPORT...

MITCHELLVILLE...RUNNELLS AND HARTFORD.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 113 AND 148.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 58 AND 88.

THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 1 AND 14.

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BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE DES MOINES IA

645 PM CDT TUE MAR 22 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...

SOUTH CENTRAL CLARKE COUNTY IN SOUTH CENTRAL IOWA...

DECATUR COUNTY IN SOUTH CENTRAL IOWA...

SOUTHEASTERN RINGGOLD COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 715 PM CDT

* AT 642 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS

STORM WAS LOCATED 9 MILES SOUTHEAST OF MOUNT AYR...OR 12 MILES WEST

OF LAMONI...AND MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...

LAMONI...LEON...KELLERTON...LAMONI AIRPORT...BEACONSFIELD...GRAND

RIVER...DECATUR CITY AND VAN WERT.

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Numerous calls of reports of funnel clouds with this new one.

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE DES MOINES IA

657 PM CDT TUE MAR 22 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...

SOUTHEASTERN ADAIR COUNTY IN SOUTHWEST IOWA...

MADISON COUNTY IN SOUTH CENTRAL IOWA...

NORTH CENTRAL UNION COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 730 PM CDT

* AT 656 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS

STORM WAS LOCATED 8 MILES SOUTHEAST OF GREENFIELD...OR 12 MILES

NORTH OF CRESTON...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...

WINTERSET...MACKSBURG...EAST PERU AND PATTERSON.

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE DES MOINES IA

652 PM CDT TUE MAR 22 2011

IAC049-121-153-181-230015-

/O.CON.KDMX.TO.W.0008.000000T0000Z-110323T0015Z/

POLK IA-DALLAS IA-MADISON IA-WARREN IA-

652 PM CDT TUE MAR 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN WARREN...NORTHERN

MADISON...SOUTHEASTERN DALLAS AND SOUTHERN POLK COUNTIES UNTIL 715 PM

CDT...

AT 651 PM CDT...EMERGENCY MANAGEMENT REPORTED A TORNADO. THIS

TORNADO WAS LOCATED NEAR NORWALK...OR 7 MILES SOUTHWEST OF DES

MOINES...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...

DES MOINES...WINDSOR HEIGHTS...CARLISLE...PLEASANT HILL...

ALTOONA...BONDURANT...DES MOINES INT AIRPORT...HARTFORD...RUNNELLS

AND MITCHELLVILLE.

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Being so close to the DMX 88D you can see some features you otherwise couldn't. Here is a five frame series of volume scans, showing the RFD importance in spinning up the tornado that dropped just north of Winterset.

No evidence of an RFD here.

Now you can see a notch and anticyclonic curl as the RFD starts to bow precip in the hook region out. It is at this time that the meso really wraps up.

As the RFD starts to wrap into the inflow the meso tightens up even further.

As the RFD starts to cut off inflow, the meso weakens and begins the occluding process.

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Southern cell

TORNADO WARNING

NATIONAL WEATHER SERVICE DES MOINES IA

709 PM CDT TUE MAR 22 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...

SOUTHEASTERN CLARKE COUNTY IN SOUTH CENTRAL IOWA...

NORTHERN DECATUR COUNTY IN SOUTH CENTRAL IOWA...

WESTERN LUCAS COUNTY IN SOUTH CENTRAL IOWA...

NORTHWESTERN WAYNE COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 745 PM CDT

* AT 705 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS

STORM WAS LOCATED 9 MILES WEST OF LEON...OR 11

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