Alert archive / Missouri / Special Weather Statements in 2018

Special Weather Statement, NWS Quad Cities, IA

August 6, 2018Scotland County, Missouri

NWS Quad Cities, IA issued this special weather statement at Aug 6, 2018, 7:08 PM CDT for Scotland County, Missouri. It was in force for 22 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
Aug 6, 2018, 7:08 PM CDT (00:08 UTC)
Expired
Aug 6, 2018, 7:30 PM CDT
In force
22 min
Issued by
NWS Quad Cities, IA

County Scotland County, MO

The radar

The Quad Cities radar (KDVN), 166 km from the middle of the area, began a volume at 00:11 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.1 hours before the alert went out and 171 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 00:00Z on 2018-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 799 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 00:00Z on 2018-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.19395878Sfc1 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
799 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
786 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.8
Supercell composite
4.9

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 Aug 6, 6:58 PM CDT, 10 minutes earlier.

Area forecast discussion, Aug 6, 6:58 PM CDT, 10 minutes before
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Hazardous weather outlook, Aug 6, 4:01 AM CDT, 15 hours 7 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
401 AM CDT Mon Aug 6 2018

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-070915-
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-
401 AM CDT Mon Aug 6 2018

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

Thunderstorms are forecast across the area through the period,
especially north of I-80 early this morning and south of I-80
later tonight. The main threats with these storms are heavy rain
and flash flooding plus lightning. Severe weather cannot be ruled
out with the potential of damaging winds and hail later this
afternoon through the overnight hours.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

There are low chances for thunderstorms mainly Tuesday and
Thursday, but no hazards are currently expected other than
lightning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible today and tonight. Rainfall reports
are especially appreciated.

Wolf

In the hours before

Local storm report, Aug 6, 3:34 PM CDT, 3 hours 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
334 PM CDT MON AUG 6 2018

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

0333 PM     HEAVY RAIN       5 N CEDAR RAPIDS        42.05N 91.68W
08/06/2018  M2.00 INCH       LINN               IA   TRAINED SPOTTER

            TOTAL RAINFALL FROM OVERNIGHT THROUGH THIS MORNING.

&&

PETERS
Local storm report, Aug 6, 6:12 PM CDT, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
612 PM CDT MON AUG 6 2018

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

0612 PM     HEAVY RAIN       3 ENE MASSBACH          42.27N 90.06W
08/06/2018  M3.00 INCH       JO DAVIESS         IL   TRAINED SPOTTER

            EVENT TOTAL

&&

PETERS
Special weather statement, Aug 6, 6:49 PM CDT, 19 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
649 PM CDT MON AUG 6 2018

IAC087-111-177-MOC045-199-070015-
Henry-Van Buren-Lee-Scotland-Clark-
649 PM CDT MON AUG 6 2018

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN HENRY...
SOUTHERN VAN BUREN...NORTHWESTERN LEE...NORTHEASTERN SCOTLAND AND
NORTHWESTERN CLARK COUNTIES UNTIL 715 PM CDT...

At 646 PM CDT, doppler radar indicated strong thunderstorms
clustered in southeast Iowa from near Mount Sterling through
Bentonsport to Houghton, moving east around 20 mph.

Pea size hail and heavy rainfall can be expected with these storms.

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.

LAT...LON 4060 9220 4060 9218 4069 9218 4092 9146
      4049 9143 4050 9222
TIME...MOT...LOC 2346Z 273DEG 23KT 4062 9188

Sheets
Local storm report, Aug 6, 7:01 PM CDT, 7 minutes before
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Special weather statement, Aug 6, 7:08 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.

IssuedProductOfficeCountiesLasted
Aug 6, 10:00 PM CDTSpecial Weather StatementDVNHenry, Jefferson, Van Buren45 min
Aug 6, 10:11 PM CDTSevere Thunderstorm WarningDVNHenry, Jefferson37 min
Aug 7, 1:28 PM CDTSpecial Weather StatementDVNJones17 min
Aug 7, 5:13 PM CDTSpecial Weather StatementDVNBenton32 min
Aug 7, 5:21 PM CDTSpecial Weather StatementDVNVan Buren39 min
Aug 7, 5:51 PM CDTSpecial Weather StatementDVNBenton, Linn54 min
Aug 7, 12:59 PM CDTSpecial Weather StatementDVNWhiteside31 min

Nearby

Special Weather Statements in Missouri, 2018Every special weather statement in 2018

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.