Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 30, NWS Quad Cities, IA

June 24, 2021Lee County, Iowa; Clark County, Missouri

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 24, 2021, 11:44 PM CDT for Lee County, Iowa; Clark County, Missouri. It was in force for 46 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 24, 2021, 11:44 PM CDT (04:44 UTC)
Expired: Jun 25, 2021, 12:30 AM CDT
In force: 46 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Lee County, IA, Clark County, MO

The radar

The Quad Cities radar (KDVN), 157 km from the middle of the area, began a volume at 04:43 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 24, 8:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.7 hours before the alert went out and 161 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: 112 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 817 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

500 
WUUS53 KDVN 250444
SVRDVN
IAC111-MOC045-250530-
/O.NEW.KDVN.SV.W.0030.210625T0444Z-210625T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1144 PM CDT Thu Jun 24 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Southwestern Lee County in southeastern Iowa...
  Clark County in northeastern Missouri...

* Until 1230 AM CDT.

* At 1144 PM CDT, severe thunderstorms were located along a line
  extending from 8 miles southwest of Bonaparte to near Kahoka to 11
  miles northwest of Canton, moving northeast at 40 mph.

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

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Kahoka and Croton around 1155 PM CDT.
  Wayland around 1200 AM CDT.

Other locations in the path of these severe thunderstorms include
Alexandria, St. Francisville, Warsaw, Keokuk, Hamilton, New Boston,
Montrose and Fort Madison.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

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

&&

LAT...LON 4026 9195 4061 9194 4061 9173 4060 9172
      4061 9171 4062 9141 4054 9141 4040 9138
      4035 9146 4028 9149 4025 9150
TIME...MOT...LOC 0444Z 238DEG 34KT 4060 9188 4038 9181 4025 9167 

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

McClure

3 follow-up statements

116 
WWUS53 KDVN 250456
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1156 PM CDT Thu Jun 24 2021

IAC111-MOC045-250530-
/O.CON.KDVN.SV.W.0030.000000T0000Z-210625T0530Z/
Lee IA-Clark MO-
1156 PM CDT Thu Jun 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR SOUTHWESTERN LEE AND CLARK COUNTIES...

At 1156 PM CDT, severe thunderstorms were located along a line
extending from near Croton to Kahoka to 7 miles southwest of
Alexandria, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Fort Madison, Keokuk, Kahoka, Hamilton, Warsaw, Montrose, Wayland,
Alexandria, New Boston, Croton, St. Francisville, Winchester, Revere,
Charleston, Keokuk Airport, Gregory Landing, Clark County
Fairgrounds, Chambersburg, Ashton and Peaksville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 AM CDT for west central
Illinois...and southeastern Iowa.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

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

&&

LAT...LON 4026 9183 4061 9188 4061 9173 4060 9172
      4061 9171 4062 9141 4054 9141 4040 9138
      4035 9146 4028 9149 4025 9150
TIME...MOT...LOC 0456Z 269DEG 34KT 4059 9174 4043 9170 4026 9154 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

McClure

390 
WWUS53 KDVN 250520
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1220 AM CDT Fri Jun 25 2021

IAC111-MOC045-250530-
/O.CON.KDVN.SV.W.0030.000000T0000Z-210625T0530Z/
Lee IA-Clark MO-
1220 AM CDT Fri Jun 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR SOUTHWESTERN LEE AND NORTHEASTERN CLARK COUNTIES...

At 1219 AM CDT, severe thunderstorms were located along a line
extending from near Croton to New Boston to near Keokuk, moving
northeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Fort Madison, Keokuk, Montrose, New Boston, St. Francisville, Croton,
Charleston, Keokuk Airport, Battle of Athens Campground, Summitville,
Mooar, Vincennes, Chatfield Park and Argyle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 AM CDT for southeastern
Iowa.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

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

&&

LAT...LON 4061 9171 4062 9141 4054 9141 4040 9138
      4045 9158 4061 9173
TIME...MOT...LOC 0519Z 236DEG 30KT 4060 9165 4053 9149 4044 9140 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

McClure

846 
WWUS53 KDVN 250526
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1226 AM CDT Fri Jun 25 2021

IAC111-MOC045-250536-
/O.EXP.KDVN.SV.W.0030.000000T0000Z-210625T0530Z/
Lee IA-Clark MO-
1226 AM CDT Fri Jun 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LEE AND
NORTHEASTERN CLARK COUNTIES WILL EXPIRE AT 1230 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with these thunderstorms.

A Tornado Watch remains in effect until 400 AM CDT for southeastern
Iowa.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
northeastern Missouri.

LAT...LON 4061 9171 4062 9141 4054 9141 4040 9138
      4045 9158 4061 9173
TIME...MOT...LOC 0526Z 270DEG 34KT 4063 9158 4056 9142 4047 9133 

$$

McClure

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 7:23 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	40 min
Jun 24, 8:13 PM CDT	Special Weather Statement	DVN	Jefferson	47 min
Jun 24, 8:42 PM CDT	Flash Flood Warning	DVN	Jefferson, Van Buren	6 hr
Jun 24, 11:34 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	41 min
Jun 25, 2:49 AM CDT	Areal Flood Warning	DVN	Jefferson, Van Buren	17 hr
Jun 25, 4:07 AM CDT	River Flood Warning	DVN	Van Buren	10 hr
Jun 25, 4:07 AM CDT	River Flood Warning	DVN	Lee	62 hr
Jun 25, 5:05 AM CDT	Special Weather Statement	DVN	Cedar	40 min
Jun 25, 8:07 AM CDT	Areal Flood Warning	DVN	Van Buren	26 hr
Jun 25, 2:12 PM CDT	Special Weather Statement	DVN	Dubuque	33 min
Jun 25, 2:48 PM CDT	Special Weather Statement	DVN	Delaware, Dubuque	57 min
Jun 25, 4:26 PM CDT	Special Weather Statement	DVN	Delaware, Dubuque	49 min
Jun 25, 6:18 PM CDT	Special Weather Statement	DVN	Benton, Jackson, Jones, Linn	42 min
Jun 24, 8:23 PM CDT	River Flood Watch	DVN	Clark	14 hr
Jun 24, 10:57 PM CDT	Special Weather Statement	DVN	Scotland	33 min
Jun 25, 10:09 AM CDT	River Flood Warning	DVN	Clark	56 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Severe Thunderstorm Warnings in Missouri, 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.