Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 82, NWS Des Moines, IA

May 19, 2012Crawford County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 19, 2012, 8:28 PM CDT for Crawford County, Iowa. It was in force for 47 min. 6 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: May 19, 2012, 8:28 PM CDT (01:28 UTC)
Expired: May 19, 2012, 9:15 PM CDT
In force: 47 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Crawford County, IA

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 01:30 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 19, 8:36 PM CDT	TSTM WND DMG	11 W Denison Airport, IA	SEVERAL TREES AND AN OLD BARN BLOWN OVER AT THE INTERSECTION OF 140TH STREET AND Q AVENUE. TIME ESTIMATED FROM RADAR.
May 19, 8:38 PM CDT	TSTM WND GST 65	7 Wsw Dow City, IA
May 19, 8:40 PM CDT	TSTM WND GST 70	6 Wsw Dow City, IA
May 19, 8:50 PM CDT	TSTM WND DMG	Ricketts, IA	POWER OUT AND BRANCHES DOWN IN TOWN. TRAMPOLINE WRAPPED AROUND A TREE. TIME ESTIMATED FROM RADAR.
May 19, 8:50 PM CDT	TSTM WND GST 60	Schleswig, IA	POWER OUT IN TOWN.
May 19, 8:51 PM CDT	TSTM WND GST 60	3 Ne Denison Airport, IA

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 19, 6:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.5 hours before the alert went out and 109 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: 1597 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1383 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 8.3

Open this sounding in Storm Lab

The text

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

567 
WUUS53 KDMX 200128
SVRDMX
IAC047-200215-
/O.NEW.KDMX.SV.W.0082.120520T0128Z-120520T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
828 PM CDT SAT MAY 19 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CRAWFORD COUNTY IN WEST CENTRAL IOWA...

* UNTIL 915 PM CDT

* AT 826 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 8 MILES WEST OF UTE TO 10 MILES NORTHWEST OF EARLING TO
  PERSIA...AND MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DENISON...MANILLA...DOW CITY...ARION...CHARTER OAK...BUCK GROVE...
  RICKETTS...DENISON AIRPORT...SCHLESWIG...DELOIT...ASPINWALL...
  VAIL...KIRON AND WESTSIDE.

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.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED
WARNING. IF A TORNADO IS SPOTTED...IMMEDIATELY MOVE TO THE BASEMENT
OR SMALL INTERIOR ROOM OF A REINFORCED BUILDING.

&&

LAT...LON 4221 9567 4222 9566 4222 9552 4221 9510
      4186 9509 4186 9567 4187 9568 4199 9568
TIME...MOT...LOC 0128Z 242DEG 40KT 4208 9584 4186 9557
          4164 9551
WIND...HAIL 60MPH <.75IN

$$

SMALL

2 follow-up statements

366 
WWUS53 KDMX 200140
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
840 PM CDT SAT MAY 19 2012

IAC047-200215-
/O.CON.KDMX.SV.W.0082.000000T0000Z-120520T0215Z/
CRAWFORD IA-
840 PM CDT SAT MAY 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CRAWFORD
COUNTY UNTIL 915 PM CDT...

AT 835 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING AN EXTENDED PERIOD 
OF DAMAGING WINDS IN EXCESS OF 60 MPH.  WINDS OF THESE SPEEDS MAY 
LAST FOR AROUND 10 MINUTES.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM 5 MILES NORTHWEST OF UTE TO 9 MILES NORTHWEST OF 
DEFIANCE TO 5 MILES WEST OF HARLAN...MOVING NORTHEAST AT 45 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  DENISON AIRPORT AND RICKETTS AROUND 845 PM CDT.
  MANILLA AND DENISON AROUND 850 PM CDT.
  SCHLESWIG AND DELOIT AROUND 855 PM CDT.
  VAIL...KIRON AND ASPINWALL AROUND 900 PM CDT.
  WESTSIDE AROUND 905 PM CDT.

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.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED
WARNING. IF A TORNADO IS SPOTTED...IMMEDIATELY MOVE TO THE BASEMENT
OR SMALL INTERIOR ROOM OF A REINFORCED BUILDING.

&&

LAT...LON 4221 9567 4222 9566 4222 9552 4221 9510
      4186 9509 4186 9567 4187 9568 4199 9568
TIME...MOT...LOC 0139Z 242DEG 40KT 4214 9569 4192 9542
          4170 9537
WIND...HAIL 60MPH <.75IN

$$

SMALL

402 
WWUS53 KDMX 200213
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
913 PM CDT SAT MAY 19 2012

IAC047-200223-
/O.EXP.KDMX.SV.W.0082.000000T0000Z-120520T0215Z/
CRAWFORD IA-
913 PM CDT SAT MAY 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR CRAWFORD COUNTY WILL EXPIRE AT
915 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED
OUT OF THE WARNED AREA.  HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS.

IN ADDITION...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 
200 AM SUNDAY MORNING.

LAT...LON 4221 9567 4222 9566 4222 9552 4221 9510
      4186 9509 4186 9567 4187 9568 4199 9568
TIME...MOT...LOC 0213Z 242DEG 40KT 4232 9524 4210 9497
          4188 9492

$$

SMALL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 9:00 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Calhoun, Carroll, Sac	27 min

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.