Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Quad Cities, IA

June 19, 20214 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 19, 2021, 12:12 AM CDT for 4 counties in Iowa. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 19, 2021, 12:12 AM CDT (05:12 UTC)
Expired: Jun 19, 2021, 1:00 AM CDT
In force: 48 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Jefferson County, IA, Keokuk County, IA, Van Buren County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 133 km from the middle of the area, began a volume at 05:11 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 18, 10:08 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 5.2 hours before the alert went out and 139 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: 4 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 2572 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

668 
WUUS53 KDVN 190512
SVRDVN
IAC101-107-177-183-190600-
/O.NEW.KDVN.SV.W.0012.210619T0512Z-210619T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1212 AM CDT Sat Jun 19 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Van Buren County in southeastern Iowa...
  Southeastern Keokuk County in southeastern Iowa...
  Southwestern Washington County in southeastern Iowa...
  Jefferson County in southeastern Iowa...

* Until 100 AM CDT.

* At 1212 AM CDT, severe thunderstorms were located along a line
  extending from near Brighton to near Birmingham to 6 miles west of
  Milton, moving east at 35 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.

* Severe thunderstorms will be near...
  Birmingham and Pleasant Plain around 1215 AM CDT.
  Brighton and Stockport around 1220 AM CDT.
  Lockridge around 1225 AM CDT.
  Hillsboro and Coppock around 1230 AM CDT.

Other locations in the path of these severe thunderstorms include
Keosauqua, Bentonsport/Vernon and Bonaparte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4120 9217 4127 9173 4109 9171 4069 9172
      4065 9182 4073 9218
TIME...MOT...LOC 0512Z 283DEG 29KT 4122 9188 4093 9190 4070 9228 

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

Gibbs

4 follow-up statements

308 
WWUS53 KDVN 190519
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1219 AM CDT Sat Jun 19 2021

IAC107-190528-
/O.CAN.KDVN.SV.W.0012.000000T0000Z-210619T0600Z/
Keokuk IA-
1219 AM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN KEOKUK COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
southeastern Iowa.

LAT...LON 4116 9217 4116 9195 4124 9194 4127 9173
      4113 9171 4069 9172 4065 9182 4073 9218
TIME...MOT...LOC 0518Z 283DEG 29KT 4121 9183 4092 9185 4069 9223 

$$

IAC101-177-183-190600-
/O.CON.KDVN.SV.W.0012.000000T0000Z-210619T0600Z/
Van Buren IA-Washington IA-Jefferson IA-
1219 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR VAN BUREN...SOUTHWESTERN WASHINGTON AND JEFFERSON COUNTIES...

At 1218 AM CDT, severe thunderstorms were located along a line
extending from near Brighton to near Stockport to near Milton, moving
east at 35 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.

These severe storms will be near...
  Brighton, Stockport and Lockridge around 1225 AM CDT.
  Hillsboro and Coppock around 1230 AM CDT.

Other locations in the path of these severe thunderstorms include
Keosauqua, Bentonsport/Vernon and Bonaparte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4116 9217 4116 9195 4124 9194 4127 9173
      4113 9171 4069 9172 4065 9182 4073 9218
TIME...MOT...LOC 0518Z 283DEG 29KT 4121 9183 4092 9185 4069 9223 

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

Gibbs

887 
WWUS53 KDVN 190526
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1226 AM CDT Sat Jun 19 2021

IAC101-177-183-190600-
/O.CON.KDVN.SV.W.0012.000000T0000Z-210619T0600Z/
Van Buren IA-Washington IA-Jefferson IA-
1226 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR VAN BUREN...SOUTHWESTERN WASHINGTON AND JEFFERSON COUNTIES...

At 1226 AM CDT, severe thunderstorms were located along a line
extending from near Coppock to near Stockport to Milton, moving east
at 35 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Stockport, Lockridge and Coppock around 1230 AM CDT.
  Hillsboro around 1235 AM CDT.

Other locations in the path of these severe thunderstorms include
Keosauqua, Bentonsport/Vernon and Bonaparte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4102 9200 4116 9195 4124 9194 4127 9173
      4113 9171 4069 9172 4065 9182 4073 9217
      4093 9213
TIME...MOT...LOC 0526Z 283DEG 29KT 4120 9175 4091 9177 4068 9215 

HAIL...0.88IN
WIND...60MPH
 
$$

Gibbs

631 
WWUS53 KDVN 190537
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1237 AM CDT Sat Jun 19 2021

IAC101-177-183-190600-
/O.CON.KDVN.SV.W.0012.000000T0000Z-210619T0600Z/
Van Buren IA-Washington IA-Jefferson IA-
1237 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR VAN BUREN...SOUTH CENTRAL WASHINGTON AND EASTERN JEFFERSON
COUNTIES...

At 1236 AM CDT, severe thunderstorms were located along a line
extending from near Wayland to near Salem to Cantril, moving east at
35 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Hillsboro around 1240 AM CDT.

Other locations in the path of these severe thunderstorms include
Bentonsport/Vernon and Bonaparte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4102 9188 4116 9179 4125 9179 4127 9173
      4113 9171 4069 9172 4065 9182 4073 9217
      4091 9213
TIME...MOT...LOC 0536Z 283DEG 29KT 4118 9165 4089 9167 4066 9205 

HAIL...0.75IN
WIND...60MPH
 
$$

Gibbs

749 
WWUS53 KDVN 190549
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1249 AM CDT Sat Jun 19 2021

IAC183-190559-
/O.CAN.KDVN.SV.W.0012.000000T0000Z-210619T0600Z/
Washington IA-
1249 AM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WASHINGTON
COUNTY IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
southeastern Iowa.

LAT...LON 4090 9213 4099 9171 4069 9172 4065 9182
      4073 9217
TIME...MOT...LOC 0549Z 279DEG 28KT 4097 9174 4082 9173 4065 9192 

$$

IAC101-177-190600-
/O.CON.KDVN.SV.W.0012.000000T0000Z-210619T0600Z/
Van Buren IA-Jefferson IA-
1249 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR VAN BUREN AND SOUTHEASTERN JEFFERSON COUNTIES...

At 1249 AM CDT, severe thunderstorms were located along a line
extending from Lockridge to Hillsboro to near Keosauqua, moving east
at 35 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Hillsboro around 1255 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4090 9213 4099 9171 4069 9172 4065 9182
      4073 9217
TIME...MOT...LOC 0549Z 279DEG 28KT 4097 9174 4082 9173 4065 9192 

HAIL...0.75IN
WIND...60MPH
 
$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 10:17 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Louisa, Washington	58 min
Jun 18, 11:03 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines	27 min
Jun 18, 11:21 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson	39 min
Jun 18, 11:29 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Louisa	46 min
Jun 18, 11:47 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Washington	29 min
Jun 19, 12:02 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk, Washington	43 min
Jun 19, 12:27 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Louisa	27 min
Jun 19, 1:08 AM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	49 min
Jun 19, 1:28 AM CDT	Special Weather Statement	DVN	Louisa	2 hr
Jun 19, 2:01 AM CDT	Special Weather Statement	DVN	Lee, Van Buren	59 min
Jun 19, 4:33 AM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	57 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.