Alert archive / Illinois / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

July 11, 2021Hancock County, McDonough County, Illinois

NWS Quad Cities, IA issued this special weather statement at Jul 11, 2021, 12:31 PM CDT for Hancock County, McDonough County, Illinois. It was in force for 29 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: Jul 11, 2021, 12:31 PM CDT (17:31 UTC)
Expired: Jul 11, 2021, 1:00 PM CDT
In force: 29 min
Issued by: NWS Quad Cities, IA

Counties Hancock County, IL, McDonough County, IL

The radar

The Quad Cities radar (KDVN), 143 km from the middle of the area, began a volume at 17:32 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, 5.5 hours before the alert went out and 146 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: 10 J/kg
Mixed-layer CIN: -364 J/kg
Mixed-layer LCL: 532 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 11, 12:21 PM CDT, 10 minutes earlier.

Area forecast discussion, Jul 11, 12:21 PM CDT, 10 minutes before

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Hazardous weather outlook, Jul 11, 3:19 AM CDT, 9 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
319 AM CDT Sun Jul 11 2021

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-120830-
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-
319 AM CDT Sun Jul 11 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

Scattered showers are expected today and tonight across the area.
Isolated lightning strikes are possible.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Near daily chances for thunderstorms are expected across the area.
Later in the week the threat for heavy rainfall and strong
thunderstorms return. At this time it is too soon to tell if there
will be severe thunderstorms.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

In the hours before

Local storm report, Jul 11, 10:37 AM CDT, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1037 AM CDT SUN JUL 11 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1036 AM     HEAVY RAIN       3 ESE KEOSAUQUA         40.72N 91.92W
07/11/2021  M3.00 INCH       VAN BUREN          IA   TRAINED SPOTTER

            TOTAL SINCE 9 PM LAST NIGHT.

&&

DC

Local storm report, Jul 11, 10:43 AM CDT, 1 hour 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1043 AM CDT SUN JUL 11 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1043 AM     HEAVY RAIN       3 W MOUNT STERLING      40.62N 92.00W
07/11/2021  M1.50 INCH       VAN BUREN          IA   TRAINED SPOTTER

            SINCE 530.

&&

DC

Special weather statement, Jul 11, 11:16 AM CDT, 1 hour 15 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
1116 AM CDT Sun Jul 11 2021

ILC067-111745-
Hancock-
1116 AM CDT Sun Jul 11 2021

...HEAVY RAIN FROM THUNDERSTORMS WILL AFFECT SOUTHERN HANCOCK COUNTY
UNTIL 1245 PM CDT...

At 1113 AM CDT, radar indicated heavy rain from thunderstorms falling
near Hamilton, or near Keokuk, moving northwest at 10 mph.

Locations impacted include...
Keokuk, Carthage, Hamilton, Warsaw, Augusta, Bowen, West Point,
Denver, Elvaston, Basco, Bentley, Tioga, Sutter, Stillwell, Hancock
County Fairgrounds and Camp Eastman.

Torrential rainfall is also occurring with these repeating showers
and storms, with rainfall rates between 1 to 2 inches per hour.
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.

LAT...LON 4020 9150 4021 9151 4024 9151 4026 9149
      4028 9149 4035 9146 4038 9141 4040 9137
      4045 9138 4049 9137 4051 9126 4027 9091
      4021 9091 4019 9115
TIME...MOT...LOC 1613Z 167DEG 7KT 4035 9129

Gunkel

Special weather statement, Jul 11, 12:31 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 10:56 AM CDT	Flash Flood Warning	DVN	Henry, Jefferson, Lee, Van Buren	4 hr
Jul 11, 11:16 AM CDT	Special Weather Statement	DVN	Hancock	89 min
Jul 11, 11:54 AM CDT	Flash Flood Warning	DVN	Hancock	6 hr
Jul 11, 2:35 PM CDT	Flash Flood Warning	DVN	Hancock, McDonough	3 hr
Jul 11, 5:49 PM CDT	Areal Flood Warning	DVN	Hancock, McDonough	18 hr

Nearby

Special Weather Statements in Illinois, 2021 Every 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.