Alert archive / Illinois / Special Weather Statements in 2012

Special Weather Statement, NWS Quad Cities, IA

July 13, 2012Lee County, Van Buren County, Iowa; 4 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this special weather statement at Jul 13, 2012, 1:20 PM CDT for Lee County, Van Buren County, Iowa; 4 counties in Illinois; Clark County, Scotland County, Missouri. It was in force for 3 hr. 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 13, 2012, 1:20 PM CDT (18:20 UTC)
Expired: Jul 13, 2012, 4:15 PM CDT
In force: 3 hr
Issued by: NWS Quad Cities, IA

Counties Lee County, IA, Van Buren County, IA, Hancock County, IL, Henderson County, IL, McDonough County, IL, Warren County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 158 km from the middle of the area, began a volume at 18:23 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, 6.3 hours before the alert went out and 162 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: 287 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1441 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: -21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 13, 12:43 PM CDT, 37 minutes earlier.

Area forecast discussion, Jul 13, 12:43 PM CDT, 37 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Jul 13, 5:00 AM CDT, 8 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
500 AM CDT FRI JUL 13 2012

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-141000-
BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO-
CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL-
HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA-
JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA-
MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL-
SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL-
WASHINGTON IA-WHITESIDE IL-
500 AM CDT FRI JUL 13 2012

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 WILL BE POSSIBLE TODAY INTO THIS EVENING...AND
POSSIBLY AGAIN LATE TONIGHT. CURRENT INFORMATION SUGGESTS NO SEVERE
STORMS ARE ANTICIPATED.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
THERE WILL BE A CHANCE FOR A FEW THUNDERSTORMS ACROSS PORTIONS OF
THE OUTLOOK AREA SATURDAY AND SATURDAY NIGHT. CURRENT INDICATIONS
SUGGEST THAT THE THREAT FOR SEVERE WEATHER IS LOW DURING THIS TIME.

MORE HOT WEATHER WILL BE POSSIBLE EARLY NEXT WEEK. HIGH TEMPERATURES
AT LEAST IN THE LOWER TO MIDDLE 90S WITH INCREASING HUMIDITY...MAY
PRODUCE HEAT INDEX VALUES NEAR 100 DEGREES MONDAY AND TUESDAY.

THERE IS A LOW CHANCE OF THUNDERSTORMS AGAIN TUESDAY THROUGH
THURSDAY BUT IT IS TOO SOON TO DETERMINE THE RISK OF SEVERE
STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT.

In the hours before

Special weather statement, Jul 13, 1:20 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
120 PM CDT FRI JUL 13 2012

IAZ088-089-098-099-ILZ025-026-034-035-MOZ009-010-132115-
VAN BUREN IA-LEE IA-HENRY IA-DES MOINES IA-MCDONOUGH IL-WARREN IL-
HENDERSON IL-HANCOCK IL-CLARK MO-SCOTLAND MO-
120 PM CDT FRI JUL 13 2012

...THUNDERSTORMS DEVELOPING RAPIDLY...

AT 115 PM CDT SCATTERED THUNDERSTORMS WERE RAPIDLY DEVELOPING IN
EXTREME SOUTHEAST IOWA...NORTHEAST MISSOURI AND WESTERN ILLINOIS.
THESE STORMS WILL BE MOVING SLOWLY NORTHEAST AND WILL PRODUCE VERY
HEAVY RAINFALL...FREQUENT DANGEROUS CLOUD TO GROUND LIGHTNING AND
WIND GUSTS TO 40 MPH.

EXPECT PONDING OF WATER ON ROADS AND IN LOW-LYING AREAS.

&&

LAT...LON 4019 9150 4024 9151 4025 9195 4030 9196
      4030 9235 4060 9236 4061 9219 4088 9219
      4090 9044 4027 9045 4028 9090 4019 9091

HAASE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 1:54 PM CDT	Special Weather Statement	DVN	Lee	111 min
Jul 13, 3:00 PM CDT	Special Weather Statement	DVN	Lee	45 min
Jul 13, 3:38 PM CDT	Special Weather Statement	DVN	Des Moines	67 min
Jul 13, 4:08 PM CDT	Special Weather Statement	DVN	Des Moines	67 min
Jul 13, 2:54 PM CDT	Special Weather Statement	DVN	McDonough	36 min
Jul 13, 3:26 PM CDT	Special Weather Statement	DVN	Bureau	64 min
Jul 13, 4:31 PM CDT	Special Weather Statement	DVN	Putnam	59 min
Jul 13, 4:38 PM CDT	Special Weather Statement	DVN	McDonough	52 min

Nearby

Special Weather Statements in Illinois, 2012 Special Weather Statements in Iowa, 2012 Special Weather Statements in Missouri, 2012 Every special weather statement in 2012

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.