Alert archive / Iowa / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 4, NWS Des Moines, IA

March 30, 2016Jasper County, Polk County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Mar 30, 2016, 8:00 PM CDT for Jasper County, Polk County, Iowa. It was in force for 35 min. 4 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 30, 2016, 8:00 PM CDT (01:00 UTC)
Expired: Mar 30, 2016, 8:35 PM CDT
In force: 35 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Jasper County, IA, Polk County, IA

The radar

The Des Moines radar (KDMX), 23 km from the middle of the area, began a volume at 01:00 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
Mar 30, 8:00 PM CDT	TSTM WND GST 61	1 Ese Saylorville, IA	TRAINED SPOTTER REPORTED WIND GUST OF 61 MPH VIA HOME WEATHER STATION. ALSO REPORTED DAMAGE TO ROOF FLASHING.
Mar 30, 8:00 PM CDT	HAIL 1	1 N Ankeny, IA	TRAINED SPOTTER REPORTED QUARTER SIZED HAIL.
Mar 30, 8:00 PM CDT	HAIL 1	1 Ne Saylorville, IA	TRAINED SPOTTER REPORTED QUARTER SIZED HAIL.
Mar 30, 8:06 PM CDT	HAIL 1	1 Wsw Ankeny, IA	TRAINED SPOTTER REPORTED QUARTER SIZED HAIL.

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 00:00Z, 1.0 hours before the alert went out and 246 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: 2 J/kg
Mixed-layer CIN: -366 J/kg
Mixed-layer LCL: 1078 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 235 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

249 
WUUS53 KDMX 310100
SVRDMX
IAC099-153-310145-
/O.NEW.KDMX.SV.W.0004.160331T0100Z-160331T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
800 PM CDT WED MAR 30 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN POLK COUNTY IN CENTRAL IOWA...
  NORTHWESTERN JASPER COUNTY IN CENTRAL IOWA...

* UNTIL 845 PM CDT

* AT 800 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ANKENY...
  MOVING EAST AT 35 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...TRAINED WEATHER SPOTTERS. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  ALTOONA...PRAIRIE MEADOWS AND ADVENTURELAND AMUSEMENT PARK AROUND 
  805 PM CDT. 
  BONDURANT AROUND 810 PM CDT. 
  MITCHELLVILLE AROUND 820 PM CDT. 
  COLFAX AROUND 830 PM CDT. 

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
WEH-WEH-NEH-KEE STATE PARK...MARGO FRANKEL WOODS STATE PARK...PRAIRIE
CITY KROHN AIRPORT...MINGO...ANKENY REGIONAL AIRPORT...VALERIA...ELKHART
AND ALLEMAN.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 35 BETWEEN MILE MARKERS 87 AND 98.
 INTERSTATE 80 BETWEEN MILE MARKERS 134 AND 160.
 INTERSTATE 235 BETWEEN MILE MARKERS 13 AND 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4163 9366 4181 9365 4183 9316 4162 9314
TIME...MOT...LOC 0100Z 268DEG 28KT 4170 9356 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

SKOW

2 follow-up statements

986 
WWUS53 KDMX 310116
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
816 PM CDT WED MAR 30 2016

IAC099-153-310145-
/O.CON.KDMX.SV.W.0004.000000T0000Z-160331T0145Z/
POLK IA-JASPER IA-
816 PM CDT WED MAR 30 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR NORTHEASTERN POLK AND NORTHWESTERN JASPER COUNTIES...

AT 816 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 4 MILES NORTHEAST
OF BONDURANT...OR 8 MILES NORTHEAST OF ALTOONA...MOVING EAST AT 30
MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING...AND TREES. 

THIS SEVERE STORM WILL BE NEAR...
  COLFAX AROUND 830 PM CDT. 
  BAXTER AROUND 845 PM CDT. 

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE MINGO
AND VALERIA.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 155 AND 158.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4168 9350 4182 9348 4183 9316 4169 9315
TIME...MOT...LOC 0116Z 258DEG 27KT 4176 9341 

HAIL...1.00IN
WIND...60MPH
 
$$

SKOW

794 
WWUS53 KDMX 310135
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
835 PM CDT WED MAR 30 2016

IAC099-153-310144-
/O.CAN.KDMX.SV.W.0004.000000T0000Z-160331T0145Z/
POLK IA-JASPER IA-
835 PM CDT WED MAR 30 2016

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN POLK AND
NORTHWESTERN JASPER COUNTIES IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER SMALL HAIL....
GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4168 9350 4182 9348 4183 9316 4169 9315
TIME...MOT...LOC 0132Z 268DEG 28KT 4176 9321 

$$

SKOW

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 7:26 PM CDT	Severe Thunderstorm Warning	DMX	Dallas	19 min
Mar 30, 7:53 PM CDT	Special Weather Statement	DMX	Polk	37 min
Mar 30, 10:16 PM CDT	Special Weather Statement	DMX	Humboldt	29 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2016 Every severe thunderstorm warning 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.