Alert archive / Illinois / Special Weather Statements in 2012
Special Weather Statement, NWS Quad Cities, IA
NWS Quad Cities, IA issued this special weather statement at Jul 1, 2012, 3:40 AM CDT for Hancock County, McDonough County, Illinois. It was in force for 65 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 1, 2012, 3:40 AM CDT (08:40 UTC)
- Expired
- Jul 1, 2012, 4:45 AM CDT
- In force
- 65 min
- Issued by
- NWS Quad Cities, IA
Counties Hancock County, IL, McDonough County, IL
The radar
The Lincoln radar (KILX), 137 km from the middle of the area, began a volume at 08:42 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, 8.7 hours before the alert went out and 144 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.
- Mixed-layer CAPE
- 2904 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 1233 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -0.9
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>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 1, 3:10 AM CDT, 30 minutes earlier.
Area forecast discussion, Jul 1, 3:10 AM CDT, 30 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 310 AM CDT SUN JUL 1 2012 .SYNOPSIS... A QUIET NIGHT ACROSS THE DVN CWA FOR A CHANGE AS THE STALLED FRONTAL BOUNDARY EXTENDS FROM BETWEEN KSTJ/KMCI TO KUIN AND THEN ALONG THE OHIO RIVER VALLEY. A 30 KNOT SOUTHERLY LOW LEVEL JET IS POINTED INTO THE PLAINS. SCATTERED CONVECTION WAS OCCURRING ALONG THE BOUNDARY SOUTH OF THE DVN CWA AND WERE MOVING EAST. WATER VAPOR LOOPS SHOW A SHORT WAVE IN SD MOVING SOUTHEAST WHICH HAS PRODUCED A CLUSTER OF THUNDERSTORMS IN SOUTHCENTRAL SD/NORTHCENTRAL NEBRASKA. CURRENT TEMPERATURES WERE IN THE LOWER TO MID 70S IN THE DVN CWA. HAASE && .SHORT TERM...TODAY AND TONIGHT... FORECAST FOCUS ON TEMPERATURES AND CONVECTIVE TRENDS. TODAY...HEIGHTS BEGIN TO RISE IN RESPONSE TO TROUGH DIGGING INTO THE PACIFIC NORTHWEST/BRITISH COLUMBIA. THIS IN TURN SHOULD LIFT THE FRONTAL BOUNDARY CURRENTLY SOUTH OF THE CWA NORTHWARD AS THE DAY PROGRESSES. WILL MAINTAIN SMALL CHANCE POPS IN OUR FAR SOUTH THIS MORNING CLOSEST TO THE BOUNDARY. IR SATELLITE PICTURES DO INDICATE CIRRUS OVER MUCH OF THE CWA BUT THIS SHOULD THIN AS THE MORNING PROGRESSES. THEN STRONG HEATING WILL PUSH MAXIMUM TEMPERATURES INTO THE LOWER TO MID 90S AT MOST LOCATIONS. HEAT INDEX VALUES SOUTH OF INTERSTATE 80 MAY RISE JUST ABOVE 100 FOR A FEW HOURS THIS AFTERNOON BUT WITH CONVECTION/CLOUDS DECIDED NOT TO ISSUE HEAT HEADLINES AT THIS TIME. DAY SHIFT CAN MONITOR TRENDS AND ISSUE AN ADVISORY IF TEMPS/DEWPOINTS RISE HIGHER THAN FORECAST. SEVERE POTENTIAL...OPERATIONAL MODELS SIMILAR IN DEVELOPING AT LEAST SCATTERED THUNDERSTORMS LATER THIS AFTERNOON AND EVENING AS WAVE OUT OF SD MOVES INTO THE AREA. CAPES RISE TO AROUND 4000 J/KG LATER THIS AFTERNOON BUT DEEP LAYER SHEAR IS MARGINAL. FRONTAL BOUNDARY WILL BE SLOWLY MOVING NORTHWARD ACROSS THE CWA WHICH WILL HELP FOCUS CONVECTION. THE CAP WILL ALSO BE WEAKENING AS FORECAST SOUNDINGS SUGGEST MID LEVEL TEMPS COOLING A BIT. DESPITE MARGINAL SHEAR THE HIGH CAPES WILL BE MORE THAN SUFFICIENT FOR ENHANCED AREAS OF DAMAGING WINDS OF 60 TO 70+ MPH LATE THIS AFTERNOON AND EVENING...ALONG WITH LOCAL HEAVY RAINFALL. WILL HAVE 50 POPS TO COVER THIS SCENARIO. SPC HAS MUCH OF THE DVN CWA IN A SLIGHT RISK. TONIGHT...WITH THE WARM FRONT LIFTING NORTHWARD THE CONVECTION WILL BE GRADUALLY ENDING FROM THE SOUTH. SEVERE POTENTIAL WILL EXIST DURING THE EVENING BUT THE TREND WILL BE FOR STORMS TO WEAKEN AFTER MIDNIGHT WITH LOSS OF HEATING. MIN TEMPS WILL BE IN THE LOWER TO MID 70S. HAASE .LONG TERM...MONDAY THROUGH SATURDAY... MONDAY THE WARM FRONT THAT WILL HAVE BEEN PASSING SLOWLY NORTH ACROSS THE AREA TODAY AND TONIGHT SHOULD FINALLY GET NORTH OF THE FORECAST AREA. THERE MAY BE SOME SHOWERS OR THUNDERSTORMS THAT GET INTO THE NORTHEASTERN COUNTIES AS CONVECTION DEVELOPS ALONG THAT BOUNDARY DURING THE AFTERNOON AS A WEAK SHORTWAVE MOVES THROUGH THE UPPER LEVEL FLOW. THUS...HAVE CARRIED SOME LOW CHANCE POPS IN THE NORTHEAST FOR MONDAY...BUT NOT MONDAY NIGHT AS THESE FEATURES MOVE FAR ENOUGH AWAY TO NOT AFFECT THE CWA ANY LONGER. WITH THE FRONT NORTH OF THE AREA WE SHOULD BE BACK IN THE HOTTER AND MORE HUMID AIR AGAIN...AND WE MAY NEED A HEAT ADVISORY FOR MONDAY WITH HIGH TEMPS BACK IN THE MID TO UPPER 90S AGAIN. WE REMAIN IN THE WARM SECTOR WITH BROAD RIDGING ALOFT AND SOUTHWEST SURFACE FLOW AT THE SURFACE FOR TUESDAY THROUGH THE REMAINDER OF THE WORK WEEK. THIS WILL LEAVE US WITH HOT AND HUMID CONDITIONS WITH HIGH TEMPS IN THE 90S AND OVERNIGHT MIN TEMPS ONLY IN THE 70S. WEDNESDAY AND WEDNESDAY EVENING THERE ARE SOME INDICATIONS THAT A SHORTWAVE WILL MOVE ACROSS THE MIDWEST WHICH MAY BE ABLE TO PRODUCE SOME SHOWERS AND THUNDERSTORMS FOR THE NORTHERN HALF OF THE AREA...ALONG WITH A DIP OF THE WARM FRONT BACK IN OUR DIRECTION AGAIN. HOWEVER...IT IS SOMEWHAT QUESTIONABLE WHETHER IT WILL MAKE IT THIS FAR SOUTH AND AM ONLY CARRYING SOME SLIGHT CHANCE POPS. FRIDAY NIGHT AND SATURDAY THERE ARE SOME DIFFERENCES SHOWING UP IN THE MODELS...WITH A COLD FRONT THAT SAGS TOWARDS THE AREA. THE GFS IS MUCH FASTER THAN THE ECMWF...BRINGING IT IN FRIDAY NIGHT VS SUNDAY RESPECTIVELY. CANNOT RULE OUT EITHER SCENARIO...SO HAVE BROUGHT IN SOME SLIGHT CHANCE POPS FOR FRIDAY NIGHT AND SATURDAY WHICH WE CAN EITHER RAISE OR LOWER AS THESE ISSUES GET RESOLVED. HAVE KEPT THE VERY WARM TEMPERATURES GOING WHICH WOULD NEED TO BE LOWERED IF THE GFS SOLUTION IS REALIZED. LE && .AVIATION... LOCAL MVFR VIS IN BR TIL 14Z THIS MORNING. THEN VFR CONDS THROUGH TONIGHT EXCEPT MVFR CIGS IN TSRA AS A WARM FRONT GRADUALLY LIFTS NORTHWARD ACROSS THE AREA TODAY. A FEW SHOWERS/ISOLD -TSRA ARE POSSIBLE AT/NEAR KBRL THIS MORNING. AT LEAST SCATTERED THUNDERSTORMS... SOME POSSIBLY SEVERE...SHOULD DEVELOP LATE THIS AFTERNOON AND EVENING. VARIABLE OR EAST TO SOUTHEAST WINDS LESS THAN 5 KNOTS THIS MORNING BECOMING SOUTH AS A WARM FRONT LIFTS NORTHWARD. SOUTH TO SOUTHWEST WINDS LESS THAN 10 KNOTS TONIGHT. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && HAASE/LE
Hazardous weather outlook, Jun 30, 4:41 AM CDT, 22 hours 59 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 441 AM CDT SAT JUN 30 2012 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-010945- 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- 441 AM CDT SAT JUN 30 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 THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND TONIGHT...MAINLY FOR AREAS SOUTH OF INTERSTATE 80. A LARGE POOL OF INSTABILITY COMBINED WITH MODERATE SHEAR AND PLENTY OF LOW LEVEL MOISTURE ARE EXPECTED TO PRODUCE STRONG TO POSSIBLY SEVERE STORMS THIS AFTERNOON AND EVENING. THE MAIN THREAT FROM THESE STORMS WILL BE DAMAGING WINDS AND LARGE HAIL. LOCALLY HEAVY RAINFALL IS POSSIBLE. A HEAT ADVISORY IS IN EFFECT LATE THIS MORNING INTO THIS EVENING FOR LOCATIONS ALONG AND SOUTH OF A FAIRFIELD IOWA TO GALESBURG ILLINOIS LINE. HEAT INDEX VALUES WILL RANGE FROM 100 TO 110. HEAT ADVISORIES MAY NEED TO BE ISSUED LATER THIS WEEKEND FOR DANGEROUS HEAT AND HUMIDITY FOR AT LEAST A PORTION OF THE OUTLOOK AREA. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SUNDAY THROUGH MONDAY...THUNDERSTORMS ARE POSSIBLE THROUGH THE PERIOD AS A WEAK FRONT LINGERS OVER THE AREA. SOME THUNDERSTORMS MAY BE SEVERE. THE PRIMARY SEVERE WEATHER THREAT WILL BE DAMAGING WIND...WITH A SECONDARY LESSER POTENTIAL FOR LARGE HAIL AND LOCALLY HEAVY RAINFALL. HEAT INDEX READINGS MAY EXCEED 100 SUNDAY AND MONDAY AFTERNOON AND EVENING...ESPECIALLY SOUTH OF INTERSTATE 80. HOT AND SOMEWHAT HUMID CONDITIONS WILL CONTINUE FOR MUCH OF THE UPCOMING WEEK...WITH HEAT INDEX READINGS ABOVE 100 POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT.
In the hours before
Special weather statement, Jul 1, 3:40 AM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 340 AM CDT SUN JUL 1 2012 ILZ034-035-010945- HANCOCK-MCDONOUGH- 340 AM CDT SUN JUL 1 2012 ...THUNDERSTORMS IN WESTERN ILLINOIS... AT 339 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THUNDERSTORMS WERE RAPIDLY DEVELOPING 6 MILES SOUTHEAST OF CARTHAGE...MOVING NORTHEAST AT 20 MPH. * THE THUNDERSTORM WILL BE NEAR... COLMAR AROUND 405 AM CDT... TENNESSEE AROUND 415 AM CDT... FANDON AND COLCHESTER AROUND 425 AM CDT... WESTERN ILLINOIS UNIVERSITY...MACOMB AND 6 MILES SOUTH OF GOOD HOPE AROUND 445 AM CDT... PEA SIZE HAIL...BRIEF HEAVY RAIN...ARE EXPECTED WITH THESE STORMS. LAT...LON 4022 9113 4039 9122 4059 9061 4040 9053 TIME...MOT...LOC 0840Z 247DEG 17KT 4034 9105 HAASE
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 6:55 AM CDT | Severe Thunderstorm Warning | DVN | Van Buren | 35 min |
| Jul 1, 8:09 AM CDT | Special Weather Statement | DVN | Des Moines, Henry, Jefferson, Van Buren | 51 min |
| Jul 1, 8:30 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 27 min |
| Jul 1, 3:48 AM CDT | Special Weather Statement | DVN | Hancock | 57 min |
| Jul 1, 5:42 AM CDT | Special Weather Statement | DVN | Hancock | 63 min |
| Jul 1, 6:35 AM CDT | Special Weather Statement | DVN | Hancock | 55 min |
| Jul 1, 6:36 AM CDT | Special Weather Statement | DVN | Hancock | 54 min |
Nearby
Special Weather Statements in Illinois, 2012Every 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.