Alert archive / Illinois / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 157, NWS Quad Cities, IA

September 27, 2019Hancock County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Sep 27, 2019, 8:41 PM CDT for Hancock County, Illinois. It was in force for 16 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 27, 2019, 8:41 PM CDT (01:41 UTC)
Expired: Sep 27, 2019, 8:57 PM CDT
In force: 16 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

County Hancock County, IL

The radar

The Quad Cities radar (KDVN), 143 km from the middle of the area, began a volume at 01:41 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
Sep 27, 4:00 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.7 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: 1148 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 6.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Sep 27, 8:33 PM CDT, 8 minutes earlier.

Area forecast discussion, Sep 27, 8:33 PM CDT, 8 minutes before

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Hazardous weather outlook, Sep 27, 3:34 PM CDT, 5 hours 7 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
334 PM CDT Fri Sep 27 2019

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-282045-
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-
334 PM CDT Fri Sep 27 2019

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...THIS AFTERNOON AND TONIGHT

Thunderstorms are expected to redevelop over the outlook area this
afternoon and continue overnight. Some storms this evening may be
severe, especially southeast of a line from Fairfield to Clinton,
Iowa to Sterling, Illinois, where the Storm Prediction Center has
place an enhanced risk. The severe weather threats include large
hail, damaging wind and isolated tornadoes. The potential for
severe weather will diminish after 10 pm.

Thunderstorms this evening and overnight could produce heavy
rainfall, which may lead to flash flooding. This threat is
greatest across portions of northeast Missouri, southeast Iowa and
west central Illinois, where heavy rainfall occurred this morning.
A Flash Flood Watch is in place for portions of northeast Missouri,
southeast Iowa and west central Illinois through early Saturday
morning.

Area rivers are experiencing flooding. Please see the latest Flood
Statements and Flood Warnings for details.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

Saturday night into Sunday, heavy rain producing thunderstorms
with rainfall rates of 2 inches an hour will be likely. This may
lead to flash flooding in areas where the ground is already
saturated.

Late Monday night into early Thursday, several rounds of showers
and thunderstorms are expected as a cold front slowly moves across
the area.  This extended period of wet weather may further
aggravate any flooding issues.

.SPOTTER INFORMATION STATEMENT...

Spotter and amateur radar activation will likely be needed this
evening.

DLS

In the hours before

Local storm report, Sep 27, 6:49 PM CDT, 1 hour 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
649 PM CDT FRI SEP 27 2019

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

0640 PM     HAIL             1 ENE BURLINGTON REGION 40.79N 91.11W
09/27/2019  E0.25 INCH       DES MOINES         IA   PUBLIC

            VIA MPING.

&&

GROSS

Local storm report, Sep 27, 7:10 PM CDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
710 PM CDT FRI SEP 27 2019

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

0543 PM     HAIL             BUDA                    41.33N 89.68W
09/27/2019  E1.75 INCH       BUREAU             IL   PUBLIC

            VIA SOCIAL MEDIA, TIME ESTIMATED FROM RADAR.

&&

GROSS

Local storm report, Sep 27, 7:30 PM CDT, 1 hour 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
730 PM CDT FRI SEP 27 2019

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

0633 PM     HAIL             KEWANEE                 41.24N 89.93W
09/27/2019  M0.75 INCH       HENRY              IL   PUBLIC

            VIA FACEBOOK.

&&

GROSS

Local storm report, Sep 27, 8:16 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
816 PM CDT FRI SEP 27 2019

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

0809 PM     TSTM WND GST     COLCHESTER              40.43N 90.79W
09/27/2019  E45 MPH          MCDONOUGH          IL   TRAINED SPOTTER

            WIND ESTIMATED 45-50 MPH.

0809 PM     HAIL             COLCHESTER              40.43N 90.79W
09/27/2019  M0.25 INCH       MCDONOUGH          IL   TRAINED SPOTTER

0801 PM     HAIL             PRAIRIE CITY            40.62N 90.47W
09/27/2019  M0.25 INCH       MCDONOUGH          IL   TRAINED SPOTTER

0759 PM     HAIL             3 SW PRAIRIE CITY       40.60N 90.50W
09/27/2019  M0.25 INCH       MCDONOUGH          IL   TRAINED SPOTTER

0749 PM     HAIL             1 N GOOD HOPE           40.57N 90.68W
09/27/2019  M0.25 INCH       MCDONOUGH          IL   TRAINED SPOTTER

            PEA SIZE HAIL FROM NORTH OF TOWN AND INTO
            COMMUNITY.

0747 PM     HAIL             1 E GOOD HOPE           40.55N 90.65W
09/27/2019  U0.50 INCH       MCDONOUGH          IL   PUBLIC

            REPORT FROM MPING: HALF-INCH (0.50 IN.).

&&

Local storm report, Sep 27, 8:32 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
832 PM CDT FRI SEP 27 2019

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

0550 PM     HAIL             6 S MEMPHIS             40.38N 92.18W
09/27/2019  E0.70 INCH       SCOTLAND           MO   TRAINED SPOTTER

            TIME ESTIMATED FROM RADAR, DELAYED REPORT.

&&

GROSS

Local storm report, Sep 27, 8:37 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
837 PM CDT FRI SEP 27 2019

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

0555 PM     HAIL             5 SSE MEMPHIS           40.39N 92.12W
09/27/2019  E1.00 INCH       SCOTLAND           MO   TRAINED SPOTTER

            1-2 MIN WORTH OF HAIL, TIME ESTIMATED FROM
            RADAR, DELAYED REPORT.

&&

GROSS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 27, 8:19 PM CDT	Flash Flood Warning	DVN	Lee	6 hr
Sep 27, 9:04 PM CDT	Flash Flood Warning	DVN	Des Moines, Lee	6 hr
Sep 28, 2:43 PM CDT	Flash Flood Watch	DVN	Des Moines, Henry, Lee, Louisa, Muscatine, Scott and 1 more	13 hr
Sep 27, 7:03 PM CDT	Flash Flood Warning	DVN	Bureau, Henry, Putnam	6 hr
Sep 27, 7:24 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough, Warren	51 min
Sep 27, 11:43 PM CDT	Special Weather Statement	DVN	Mercer	47 min
Sep 28, 12:31 AM CDT	Special Weather Statement	DVN	Bureau, Henry	44 min
Sep 28, 4:45 AM CDT	River Flood Warning	DVN	Henry	40 hr
Sep 28, 8:59 AM CDT	River Flood Warning	DVN	Hancock, McDonough	30 hr
Sep 28, 9:44 AM CDT	River Flood Warning	DVN	Hancock	35 days

Nearby

Severe Thunderstorm Warnings in Illinois, 2019 Every severe thunderstorm warning in 2019

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.