Alert archive / Iowa / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

June 24, 2021Lee County, Van Buren County, Iowa; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this special weather statement at Jun 24, 2021, 7:23 AM CDT for Lee County, Van Buren County, Iowa; Clark County, Scotland County, Missouri. It was in force for 52 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, 7:23 AM CDT (12:23 UTC)
Expired
Jun 24, 2021, 8:15 AM CDT
In force
52 min
Issued by
NWS Quad Cities, IA

Counties Lee County, IA, Van Buren County, IA, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 153 km from the middle of the area, began a volume at 12:25 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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 0.4 hours before the alert went out and 158 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2021-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 389 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2021-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
389 J/kg
Mixed-layer CIN
-353 J/kg
Mixed-layer LCL
1072 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Jun 24, 6:53 AM CDT, 30 minutes earlier.

Area forecast discussion, Jun 24, 6:53 AM CDT, 30 minutes before
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Hazardous weather outlook, Jun 24, 3:03 AM CDT, 4 hours 20 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
303 AM CDT Thu Jun 24 2021

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-250815-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
303 AM CDT Thu Jun 24 2021

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...TODAY AND TONIGHT

The Storm Prediction Center is forecasting an Enhanced Risk for
severe storms today and tonight, for northeast Missouri, and a
Slight Risk for the remainder of outlook area.

There will be two rounds of strong thunderstorms today. The first
will be this morning, with strong winds and heavy rain possible in
a line of storms moving through areas generally south of Highway
30.

Tonight, thunderstorms are possible over the entire area, but the
main threats will be found along and south of Interstate 80 where
damaging winds, large hail and torrential rainfall are most
possible.

Isolated areas of flash flooding are possible tonight, mainly
along and south of Highway 34, where soils are already wet.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A Slight Risk for severe weather has been issued by the Storm
Prediction Center on Friday, with the main threats being isolated
cases of large hail and severe winds. Several rounds of showers
and storms are expected through Friday, which leads to a
Slight Risk for Excessive Rainfall. Flash flooding will be a
growing concern as forecast confidence grows on the axis of
heaviest rain and timing.

Another day of heavy rain chances on Saturday, but will slowly
begin to die off in the evening. We have another Marginal Risk for
severe weather on Saturday, with the threats being isolated large
hail and severe gusts. Flash flooding threat will continue
through Saturday as well. After Saturday, daily chances for
showers and storms exist.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed for portions of the area on
Today and Tonight.

ERVIN/GUNKEL

In the hours before

Special weather statement, Jun 24, 7:23 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
723 AM CDT Thu Jun 24 2021

IAC111-177-MOC045-199-241315-
Van Buren-Lee-Scotland-Clark-
723 AM CDT Thu Jun 24 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT VAN BUREN...LEE...
SCOTLAND AND CLARK COUNTIES UNTIL 815 AM CDT...

At 723 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Stockport to near Keosauqua to near
Memphis. Movement was southeast at 45 mph.

Wind gusts up to 50 mph are possible with these storms.

Locations impacted include...
Fort Madison, Keokuk, Kahoka, Memphis, Nauvoo, Keosauqua, Hamilton,
Warsaw, West Point, Donnellson, Montrose, Wayland, Birmingham,
Milton, Bonaparte, Stockport, Wyaconda, Cantril, Alexandria and
Franklin.

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms. Minor
flooding of low lying areas, creeks, streams and urban areas is
possible. If you encounter water over a roadway, do not drive through
it.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4026 9191 4030 9195 4030 9198 4048 9232
      4060 9224 4060 9218 4071 9218 4090 9212
      4085 9172 4081 9172 4080 9139 4073 9122
      4064 9125 4061 9135 4055 9141 4050 9136
      4039 9138 4036 9145 4028 9149 4025 9155
TIME...MOT...LOC 1223Z 299DEG 41KT 4088 9188 4068 9200 4050 9218

Gibbs

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 24, 2:08 PM CDTFlash Flood WatchDVNCedar, Clinton, Des Moines, Henry, Jefferson, Johnson and 7 more54 hr
Jun 24, 9:55 AM CDTRiver Flood WarningDVNHancock, McDonough37 hr
Jun 24, 10:39 AM CDTSpecial Weather StatementDVNMcDonough66 min

Nearby

Special Weather Statements in Iowa, 2021Special Weather Statements in Missouri, 2021Every special weather statement 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.