Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Quad Cities, IA

May 2, 20124 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at May 2, 2012, 4:22 AM CDT for 4 counties in Iowa. It was in force for 38 min. 3 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 2, 2012, 4:22 AM CDT (09:22 UTC)
Expired: May 2, 2012, 5:00 AM CDT
In force: 38 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA

The radar

The Quad Cities radar (KDVN), 70 km from the middle of the area, began a volume at 09:23 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, 4:40 AM CDT	TSTM WND GST 50	Maquoketa, IA	ESTIMATE JUST BELOW SEVERE LEVELS.
May 2, 4:50 AM CDT	TSTM WND DMG	1 N Bellevue, IA	REPORT OF SEVERAL BRANCHES DOWN ABOUT 6 INCHES IN DIAMETER. TIME ESTIMATED FROM RADAR.
May 2, 4:52 AM CDT	TSTM WND DMG	Bellevue, IA	REPORT OF A FEW 2 INCH TREE LIMBS DOWN IN THE CITY. TIME ESTIMATED FROM RADAR.

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, 9.4 hours before the alert went out and 69 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.

750 
WUUS53 KDVN 020922
SVRDVN
IAC045-061-097-105-021000-
/O.NEW.KDVN.SV.W.0021.120502T0922Z-120502T1000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
422 AM CDT WED MAY 2 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CLINTON COUNTY IN EAST CENTRAL IOWA...
  JACKSON COUNTY IN EAST CENTRAL IOWA...
  EASTERN JONES COUNTY IN EAST CENTRAL IOWA...
  SOUTHEASTERN DUBUQUE COUNTY IN NORTHEAST IOWA...

* UNTIL 500 AM CDT.

* AT 419 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS AROUND 60
  MPH.  THIS STORM WAS LOCATED APPROXIMATELY NEAR WYOMING...OR 14
  MILES EAST OF ANAMOSA...AND MOVING EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MONMOUTH...CANTON...NASHVILLE...BERNARD...MAQUOKETA...HURSTVILLE...
  FULTON...ZWINGLE...ANDREW...LA MOTTE...SPRINGBROOK...
  SPRAGUEVILLE...ST. DONATUS...BELLEVUE AND GREEN ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

&&

LAT...LON 4238 9048 4233 9042 4228 9043 4222 9039
      4217 9024 4211 9016 4196 9106 4213 9115
      4246 9063
TIME...MOT...LOC 0922Z 249DEG 43KT 4209 9097
WIND...HAIL 60MPH <1.00IN

$$

NICHOLS

2 follow-up statements

631 
WWUS53 KDVN 020943
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
443 AM CDT WED MAY 2 2012

IAC045-061-105-020951-
/O.CAN.KDVN.SV.W.0021.000000T0000Z-120502T1000Z/
DUBUQUE IA-CLINTON IA-JONES IA-
443 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN JONES...NORTHWESTERN
CLINTON AND SOUTHEASTERN DUBUQUE COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER 
HAS MOVED OUT OF THE WARNED AREA. THEREFORE THE SEVERE THUNDERSTORM 
WARNING HAS BEEN CANCELLED.

HOWEVER...THIS STORM IS STILL CAPABLE OF PRODUCING GUSTY WINDS.

LAT...LON 4233 9042 4230 9043 4226 9042 4222 9039
      4219 9029 4210 9024 4208 9036 4205 9076
      4222 9084 4230 9071 4229 9067 4232 9067
      4239 9057 4238 9051
TIME...MOT...LOC 0941Z 249DEG 43KT 4217 9068

$$

IAC097-021000-
/O.CON.KDVN.SV.W.0021.000000T0000Z-120502T1000Z/
JACKSON IA-
443 AM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 AM CDT
FOR JACKSON COUNTY...

AT 437 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS
AROUND 60 MPH.  THIS STORM WAS LOCATED APPROXIMATELY NEAR
IRONHILLS...OR 7 MILES NORTHWEST OF MAQUOKETA...MOVING EAST AT 50
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OTTER
CREEK...ANDREW...COTTONVILLE...LA MOTTE...SPRINGBROOK...ST.
DONATUS...VAN BUREN...BELLEVUE...SMITHS...REECEVILLE AND GREEN
ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 4233 9042 4230 9043 4226 9042 4222 9039
      4219 9029 4210 9024 4208 9036 4205 9076
      4222 9084 4230 9071 4229 9067 4232 9067
      4239 9057 4238 9051
TIME...MOT...LOC 0941Z 249DEG 43KT 4217 9068
WIND...HAIL 60MPH <1.00IN

$$

NICHOLS

425 
WWUS53 KDVN 020958
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
458 AM CDT WED MAY 2 2012

IAC097-021008-
/O.EXP.KDVN.SV.W.0021.000000T0000Z-120502T1000Z/
JACKSON IA-
458 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR JACKSON COUNTY WILL EXPIRE AT
500 AM CDT...

THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER HAS
WEAKENED. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED
TO EXPIRE.

LAT...LON 4233 9042 4230 9043 4226 9042 4222 9039
      4219 9029 4210 9024 4208 9036 4205 9076
      4222 9084 4230 9071 4229 9067 4232 9067
      4239 9057 4238 9051
TIME...MOT...LOC 0958Z 249DEG 43KT 4224 9042

$$

NICHOLS

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 2, 4:26 AM CDT	Severe Thunderstorm Warning	DVN	Johnson, Louisa, Muscatine, Scott	49 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.