Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Des Moines, IA

May 2, 20124 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 2, 2012, 2:37 AM CDT for 4 counties in Iowa. It was in force for 36 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: May 2, 2012, 2:37 AM CDT (07:37 UTC)
Expired: May 2, 2012, 3:13 AM CDT
In force: 36 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Black Hawk County, IA, Grundy County, IA, Marshall County, IA, Tama County, IA

The radar

The Des Moines radar (KDMX), 117 km from the middle of the area, began a volume at 07:40 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
May 2, 2:40 AM CDT	TSTM WND DMG	Sse Reinbeck, IA	LARGE LIMB TOPPLED A POWER LINE WHICH FELL ACROSS IA-175 IN REINBECK. SEVERAL OTHER LARGE LIMBS DOWN ACROSS THE WEST SIDE OF TOWN. TIME ESTIMATED FROM RADAR.

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.

Issued	Product	Office	Lasted
May 1, 9:18 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.6 hours before the alert went out and 169 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: 572 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

944 
WUUS53 KDMX 020737
SVRDMX
IAC013-075-127-171-020830-
/O.NEW.KDMX.SV.W.0039.120502T0737Z-120502T0830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
237 AM CDT WED MAY 2 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BLACK HAWK COUNTY IN NORTHEAST IOWA...
  EASTERN GRUNDY COUNTY IN CENTRAL IOWA...
  EASTERN MARSHALL COUNTY IN CENTRAL IOWA...
  TAMA COUNTY IN CENTRAL IOWA...

* UNTIL 330 AM CDT

* AT 235 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES EAST OF CONRAD...OR 14
  MILES NORTHEAST OF MARSHALLTOWN...AND MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WATERLOO...REINBECK...TOLEDO...TAMA...CEDAR FALLS...HUDSON...
  EVANSDALE...DYSART...LA PORTE CITY...GARWIN...DIKE...TRAER...
  CLUTIER...CHELSEA...VINING...ELBERON...ELK RUN HEIGHTS...IRVING...
  RAYMOND AND GILBERTVILLE.

THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 57 AND 73.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...
SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4229 9229 4200 9229 4186 9229 4186 9257
      4186 9262 4187 9292 4255 9275 4255 9208
      4229 9207
TIME...MOT...LOC 0738Z 275DEG 53KT 4220 9270
WIND...HAIL 60MPH <.75IN

$$

BEERENDS

3 follow-up statements

948 
WWUS53 KDMX 020756
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
256 AM CDT WED MAY 2 2012

IAC127-020806-
/O.CAN.KDMX.SV.W.0039.000000T0000Z-120502T0830Z/
MARSHALL IA-
256 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MARSHALL COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4229 9229 4186 9229 4187 9276 4228 9275
      4230 9255 4254 9256 4255 9208 4229 9207
TIME...MOT...LOC 0756Z 276DEG 42KT 4219 9247

$$

IAC013-075-171-020830-
/O.CON.KDMX.SV.W.0039.000000T0000Z-120502T0830Z/
TAMA IA-GRUNDY IA-BLACK HAWK IA-
256 AM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BLACK HAWK...
EAST CENTRAL GRUNDY AND TAMA COUNTIES UNTIL 330 AM CDT...

AT 254 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 10 MILES WEST OF DYSART...OR 22 MILES
SOUTH OF WATERLOO...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  WATERLOO...EVANSDALE...DYSART...LA PORTE CITY...CLUTIER...VINING...
  CHELSEA...ELK RUN HEIGHTS...ELBERON...RAYMOND...IRVING...
  GILBERTVILLE AND JESUP GOLF COURSE.

THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 57 AND 73.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4229 9229 4186 9229 4187 9276 4228 9275
      4230 9255 4254 9256 4255 9208 4229 9207
TIME...MOT...LOC 0756Z 276DEG 42KT 4219 9247
WIND...HAIL 60MPH <.75IN

$$

BEERENDS

701 
WWUS53 KDMX 020810
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
310 AM CDT WED MAY 2 2012

IAC075-020820-
/O.CAN.KDMX.SV.W.0039.000000T0000Z-120502T0830Z/
GRUNDY IA-
310 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL GRUNDY
COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4229 9229 4186 9229 4187 9259 4224 9252
      4231 9240 4254 9224 4255 9208 4229 9207
TIME...MOT...LOC 0810Z 277DEG 37KT 4217 9228

$$

IAC013-171-020830-
/O.CON.KDMX.SV.W.0039.000000T0000Z-120502T0830Z/
TAMA IA-BLACK HAWK IA-
310 AM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
BLACK HAWK AND EASTERN TAMA COUNTIES UNTIL 330 AM CDT...

AT 307 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR DYSART...OR 15 MILES WEST OF
VINTON...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  LA PORTE CITY...GILBERTVILLE AND JESUP GOLF COURSE.

THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 57 AND 71.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4229 9229 4186 9229 4187 9259 4224 9252
      4231 9240 4254 9224 4255 9208 4229 9207
TIME...MOT...LOC 0810Z 277DEG 37KT 4217 9228
WIND...HAIL 60MPH <.75IN

$$

BEERENDS

016 
WWUS53 KDMX 020813
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
313 AM CDT WED MAY 2 2012

IAC013-171-020824-
/O.CAN.KDMX.SV.W.0039.000000T0000Z-120502T0830Z/
TAMA IA-BLACK HAWK IA-
313 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BLACK HAWK AND
EASTERN TAMA COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 AM CDT.

LAT...LON 4229 9229 4186 9229 4187 9259 4224 9252
      4231 9240 4254 9224 4255 9208 4229 9207
TIME...MOT...LOC 0814Z 277DEG 37KT 4215 9223

$$

BEERENDS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 9:59 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	46 min
May 1, 10:45 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Palo Alto	45 min
May 1, 11:24 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Webster, Wright	51 min
May 1, 11:35 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	25 min
May 2, 12:01 AM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	44 min
May 2, 12:38 AM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Greene, Sac	52 min
May 2, 1:02 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Guthrie	43 min
May 2, 1:07 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Carroll, Dallas, Greene, Guthrie	38 min
May 2, 1:24 AM CDT	Tornado Warning	DMX	Boone	36 min
May 2, 1:27 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Story, Webster	48 min
May 2, 1:39 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Polk, Story	51 min
May 2, 1:47 AM CDT	Tornado Warning	DMX	Boone, Hamilton, Hardin, Story	28 min
May 2, 1:53 AM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	52 min
May 2, 2:04 AM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Story	41 min
May 2, 3:18 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	15 min
May 2, 3:46 PM CDT	Flash Flood Watch	DMX	Black Hawk, Bremer, Butler, Cerro Gordo, Franklin, Grundy and 1 more	12 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2012 Every severe thunderstorm warning in 2012

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.