Alert archive / Illinois / Special Weather Statements in 2012

Special Weather Statement, NWS Quad Cities, IA

July 26, 2012Bureau County, Henry County, Putnam County, Illinois

NWS Quad Cities, IA issued this special weather statement at Jul 26, 2012, 4:52 PM CDT for Bureau County, Henry County, Putnam County, Illinois. It was in force for 53 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 26, 2012, 4:52 PM CDT (21:52 UTC)
Expired: Jul 26, 2012, 5:45 PM CDT
In force: 53 min
Issued by: NWS Quad Cities, IA

Counties Bureau County, IL, Henry County, IL, Putnam County, IL

The radar

The Quad Cities radar (KDVN), 93 km from the middle of the area, began a volume at 21:55 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, 9.9 hours before the alert went out and 88 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: 413 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 26, 3:33 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jul 26, 3:33 PM CDT, 1 hour 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
333 PM CDT THU JUL 26 2012

.SYNOPSIS...
12Z UA ANALYSIS HAS AN 850MB COLD FRONT FROM NORTHERN WISCONSIN
SOUTHWEST INTO THE OKLAHOMA PANHANDLE. SEVERAL TROFS WERE ACROSS
THE NORTHERN PLAINS BEHIND THE 850MB COLD FRONT. RADAR/SATELLITE
TRENDS THROUGH MID AFTERNOON SHOW DIURNAL CONVECTION HAS DEVELOPED
FROM SOUTHERN WISCONSIN INTO SOUTHEAST IOWA.

18Z SFC ANALYSIS HAS A FRONT/BOUNDARY FROM KVOK BACK TO KRSL. THIS
BOUNDARY MAY BE A VERY DIFFUSE COLD FRONT AS DEW POINTS QUICKLY
DROP INTO THE UPPER 50S AND LOWER 60S BEHIND THE BOUNDARY. AHEAD
OF THE FRONT/BOUNDARY DEW POINTS WERE IN THE LOW 70S.

&&

.SHORT TERM...TONIGHT AND FRIDAY
AN AREA OF DIFFERENTIAL HEATING ALONG THE FRONT/BOUNDARY HAS
ALLOWED CONVECTIVE TEMPERATURE TO BE ACHIEVED.

RAP TRENDS INDICATE THE CURRENT CONVECTION WILL REMAIN ISOLATED
OVER SOUTHEAST IOWA AND MORE SCATTERED FROM THE QUAD CITIES TO THE
NORTH AND EAST. RAP TRENDS INDICATE THIS CONVECTION WILL PERSIST
INTO THE LATE AFTERNOON AND EARLY EVENING IN THE FAR EASTERN AND
SOUTHERN SECTIONS OF THE CWFA.

THE APPROACHING SHORTWAVE ACROSS MINNESOTA IS ALLOWING CU TO
DEVELOP FROM SOUTHERN MINNESOTA INTO NORTHERN IOWA. RADAR SHOWS NO
CONVECTION AS YET BUT WITH PEAK HEATING OCCURRING CONVECTION MAY
DEVELOP IN THE NEXT COUPLE OF HOURS. IF THIS OCCURS...THEN IT MAY
GET INTO THE HWY 20 CORRIDOR THIS EVENING. NEARLY ALL CONVECTION
SHOULD DISSIPATE WITHIN A FEW HOURS AFTER SUNSET. HOWEVER...
CONVECTION DID PERSIST OVERNIGHT CLOSE TO THE SFC LOW AND UPPER
LOW. THUS IT IS POSSIBLE THAT SOME ISOLATED SHRA/TSRA MAY PERSIST
PAST MIDNIGHT THAT CATCHES THE NORTHEAST PART OF THE CWFA.

FRIDAY IS LOOKING TO BE QUITE NICE WITH TEMPERATURES NEAR NORMAL.
HUMIDITY LEVELS WILL ALSO BE LOW.          ..08..

.LONG TERM...FRIDAY NIGHT THROUGH NEXT THURSDAY
HIGH PRESSURE BUILDS INTO THE REGION FRIDAY NIGHT AND SATURDAY TO
KEEP THINGS QUIET BOTH PERIODS.  HOWEVER...SATURDAY NIGHT AND SUNDAY
A NICE WARM AIR ADVECTION SURGE WITH A WEAK SHORTWAVE MOVES ACROSS
THE AREA TO BRING SOME PRECIPITATION CHANCES TO THE AREA.
TEMPERATURES WILL BE COOLER THAN WHAT WE HAVE HAD RECENTLY...WITH
HIGHS IN THE 80S TO AROUND 90 BOTH DAYS.

SUNDAY NIGHT THROUGH MONDAY NIGHT A STRONGER SHORTWAVE COMES ALONG
TO INTERACT WITH A WEAK 850MB BAROCLINIC ZONE TO BRING SOME
PRECIPITATION CHANCES TO THE AREA.  THERE IS ROUGH AGREEMENT WITH
THE MODELS...BUT WITH TIMING DIFFERENCES TO ADD SOME CONFUSION.
HIGHS MONDAY TO BEGIN CREEPING UP...RISING INTO THE MID 80S TO LOW
90S.

TUESDAY THROUGH WEDNESDAY MODELS ARE IN GENERAL AGREEMENT THAT A
SURFACE RIDGE WILL BUILD ACROSS THE REGION...WHICH IS NOT ESPECIALLY
FAVORABLE FOR PRECIPITATION CHANCES...SO HAVE KEPT THOSE DRY OR AT
MOST SLIGHT CHANCE.  HIGHS REMAIN IN THE 80S TO LOW 90S WITH THE
CONTINUING NORTHWEST FLOW ALOFT AND ENOUGH MOISTURE AT MID LEVELS TO
PRODUCE SOME MID CLOUDS.

THURSDAY WE HAVE A WEAK COLD FRONT AND HINTS AT AN UPPER LEVEL
SHORTWAVE TO MOVE THROUGH THE AREA...THOUGH MODELS HAVE A LOT OF
DIFFERENCES AND CONFIDENCE IS NOT VERY HIGH.  HOWEVER...IT WAS
ENOUGH TO PUT IN TO CARRY SOME LOW END CHANCE POPS.

LE

&&

.AVIATION...
CONVECTION HAS INITIATED ON A FRONT/BOUNDARY FROM NORTHWEST
ILLINOIS INTO SOUTHEAST IOWA. RAP MODEL TRENDS SUGGEST TRSA MAY
AFFECT KMLI/KBRL THROUGH 00Z/27. POST FRONTAL CONVECTION WILL BE
POSSIBLE THROUGH 03Z/27 THAT MIGHT AFFECT KCID/KDBQ. AFT 03Z/27
GENERALLY VFR WX IS EXPECTED. THERE IS THE POSSIBILITY OF SOME
MVFR VSBYS DVLPG ARND SUNRISE FRIDAY BUT WAS NOT INCLUDED IN THE
18Z TAFS.              ..08..

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...NONE.
IL...NONE.
MO...NONE.
&&

Hazardous weather outlook, Jul 26, 3:50 AM CDT, 13 hours 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
350 AM CDT THU JUL 26 2012

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-270900-
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-
350 AM CDT THU JUL 26 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

ISOLATED THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA EARLY THIS
MORNING AND AGAIN FROM LATE AFTERNOON INTO EARLY EVENING. ANY
STORMS THAT DEVELOP ARE NOT EXPECTED TO BE SEVERE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THUNDERSTORMS ARE POSSIBLE SATURDAY NIGHT THROUGH MONDAY. IT IS
TOO SOON TO DETERMINE THE POTENTIAL FOR SEVERE WEATHER IN THESE
PERIODS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

SHEETS

In the hours before

Special weather statement, Jul 26, 3:54 PM CDT, 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
354 PM CDT THU JUL 26 2012

ILZ009-016>018-262200-
BUREAU-HENRY-PUTNAM-WHITESIDE-
354 PM CDT THU JUL 26 2012

...LINE OF STORMS WITH STRONG WINDS...

AT 349 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 13 MILES NORTH OF
DEER GROVE TO TAMPICO...MOVING EAST AT 25 MPH.

* THUNDERSTORMS WILL BE NEAR...
  DEER GROVE AROUND 400 PM CDT...
  WALNUT AROUND 415 PM CDT...
  LA MOILLE AROUND 450 PM CDT...
  6 MILES NORTHWEST OF LADD AND 8 MILES NORTHWEST OF DALZELL AROUND
  500 PM CDT...

WINDS UP TO 55 MPH...BRIEF HEAVY RAIN...CAN BE EXPECTED WITH THESE
STORMS.

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

LAT...LON 4158 8988 4181 8963 4159 8962 4158 8916
      4130 8916
TIME...MOT...LOC 2053Z 289DEG 22KT 4178 8961 4158 8980

08

Local storm report, Jul 26, 3:58 PM CDT, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
358 PM CDT THU JUL 26 2012

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

0345 PM     TSTM WND GST     TAMPICO                 41.63N 89.79W
07/26/2012  E50 MPH          WHITESIDE          IL   TRAINED SPOTTER

            REPORT WAS RELAYED BY WFO LOT.

&&

DC

Local storm report, Jul 26, 4:02 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
402 PM CDT THU JUL 26 2012

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

0342 PM     TSTM WND GST     4 SSW BETTENDORF        41.52N 90.51W
07/26/2012  M56 MPH          ROCK ISLAND        IL   DEPT OF HIGHWAYS

            IOWA DOT RWIS ON I-74 BRIDGE.

&&

Local storm report, Jul 26, 4:15 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
415 PM CDT THU JUL 26 2012

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

0354 PM     HAIL             5 SSW BETTENDORF        41.50N 90.51W
07/26/2012  M0.25 INCH       ROCK ISLAND        IL   TRAINED SPOTTER

&&

DC

Special weather statement, Jul 26, 4:43 PM CDT, 9 minutes before

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Special weather statement, Jul 26, 4:52 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 25, 8:35 PM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Linn	85 min
Jul 25, 9:22 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware, Linn	53 min
Jul 25, 10:12 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jackson, Jones, Linn	63 min
Jul 25, 10:12 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	48 min
Jul 25, 10:22 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Iowa, Johnson, Linn	53 min
Jul 25, 10:56 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Jackson, Johnson, Jones, Linn	64 min
Jul 25, 11:45 PM CDT	Special Weather Statement	DVN	Des Moines	60 min
Jul 26, 1:21 AM CDT	Special Weather Statement	DVN	Des Moines	69 min
Jul 26, 1:35 AM CDT	Special Weather Statement	DVN	Cedar	25 min
Jul 26, 2:20 AM CDT	Special Weather Statement	DVN	Henry, Mercer	25 min
Jul 26, 2:32 AM CDT	Special Weather Statement	DVN	Henry	43 min
Jul 26, 3:05 AM CDT	Special Weather Statement	DVN	Henry	70 min
Jul 26, 3:46 PM CDT	Special Weather Statement	DVN	Henry	59 min
Jul 26, 3:54 PM CDT	Special Weather Statement	DVN	Bureau	66 min
Jul 26, 4:43 PM CDT	Special Weather Statement	DVN	Hancock	62 min

Nearby

Special Weather Statements in Illinois, 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.