Alert archive / Iowa / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 1, NWS Quad Cities, IA

January 28, 20134 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jan 28, 2013, 9:44 PM CST for 4 counties in Iowa. It was in force for 46 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jan 28, 2013, 9:44 PM CST (03:44 UTC)
Expired: Jan 28, 2013, 10:30 PM CST
In force: 46 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 58.0 mph

Counties Benton County, IA, Buchanan County, IA, Delaware County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 122 km from the middle of the area, began a volume at 03:46 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.

What was reported inside it

Time	Report	Where	Remark
Jan 28, 9:45 PM CST	HAIL 0.25	1 Se Vinton, IA	PEA SIZED HAIL.
Jan 28, 9:54 PM CST	HAIL 0.5	Wsw Urbana, IA	HAIL GENERALLY LESS THAN DIME SIZED.
Jan 28, 10:15 PM CST	HAIL 0.25	Manchester, IA
Jan 28, 10:15 PM CST	HAIL 0.25	Masonville, IA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.7 hours before the alert went out and 126 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 483 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 328 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.

316 
WUUS53 KDVN 290344
SVRDVN
IAC011-019-055-113-290430-
/O.NEW.KDVN.SV.W.0001.130129T0344Z-130129T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
944 PM CST MON JAN 28 2013

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BENTON COUNTY IN EAST CENTRAL IOWA...
  NORTHWESTERN LINN COUNTY IN EAST CENTRAL IOWA...
  EASTERN BUCHANAN COUNTY IN NORTHEAST IOWA...
  NORTHWESTERN DELAWARE COUNTY IN NORTHEAST IOWA...

* UNTIL 1030 PM CST.

* AT 942 PM CST...TRAINED SPOTTERS AND DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED APPROXIMATELY NEAR VINTON...AND MOVING NORTHEAST
  AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  URBANA...CENTER POINT...WALKER...ROWLEY...TROY MILLS...
  QUASQUETON...WINTHROP...MASONVILLE...LAMONT...MANCHESTER...
  DUNDEE...DELAWARE...GREELEY...COLESBURG AND EDGEWOOD.

THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 35 AND 50.



&&

LAT...LON 4265 9114 4262 9113 4200 9195 4212 9214
      4265 9170
TIME...MOT...LOC 0345Z 220DEG 46KT 4217 9192
WIND...HAIL <58MPH 1.00IN

$$

DLF

2 follow-up statements

653 
WWUS53 KDVN 290408
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1008 PM CST MON JAN 28 2013

IAC011-113-290416-
/O.CAN.KDVN.SV.W.0001.000000T0000Z-130129T0430Z/
LINN IA-BENTON IA-
1008 PM CST MON JAN 28 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BENTON AND
NORTHWESTERN LINN COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER 
MOVED OUT OF THE WARNED AREA. THEREFORE THE SEVERE THUNDERSTORM 
WARNING HAS BEEN CANCELLED.

LAT...LON 4265 9114 4262 9114 4230 9158 4230 9199
      4265 9170
TIME...MOT...LOC 0406Z 220DEG 46KT 4238 9168

$$

IAC019-055-290430-
/O.CON.KDVN.SV.W.0001.000000T0000Z-130129T0430Z/
DELAWARE IA-BUCHANAN IA-
1008 PM CST MON JAN 28 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CST
FOR EASTERN BUCHANAN AND NORTHWESTERN DELAWARE COUNTIES...

AT 1003 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED APPROXIMATELY NEAR TROY MILLS PARK...OR
12 MILES SOUTHEAST OF INDEPENDENCE...MOVING NORTHEAST AT 55 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
ROBINSON...MONTI...WINTHROP...WINTHROP GOLF COURSE...MASONVILLE...
COFFINS GROVE PARK...MANCHESTER AIRPORT...BAILEYS FORD PARK...
LAMONT...MANCHESTER...DUNDEE...DELAWARE...BACKBONE STATE PARK...
ONEIDA...TWIN BRIDGES PARK...GREELEY...FOUNTAIN SPRINGS PARK...
COLESBURG AND EDGEWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT ANY SEVERE WEATHER OR DAMAGE TO YOUR LOCAL LAW
ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4265 9114 4262 9114 4230 9158 4230 9199
      4265 9170
TIME...MOT...LOC 0406Z 220DEG 46KT 4238 9168
WIND...HAIL <58MPH 1.00IN

$$

868 
WWUS53 KDVN 290429
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1029 PM CST MON JAN 28 2013

IAC019-055-290439-
/O.EXP.KDVN.SV.W.0001.000000T0000Z-130129T0430Z/
DELAWARE IA-BUCHANAN IA-
1029 PM CST MON JAN 28 2013

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BUCHANAN AND
NORTHWESTERN DELAWARE COUNTIES WILL EXPIRE AT 1030 PM CST...

THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER HAS
WEAKENED. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED
TO EXPIRE.

HOWEVER...STORMS OVER DELAWARE AND BUCHANAN COUNTIES ARE STILL 
CAPABLE OF PRODUCING PEA TO DIME SIZE HAIL AND BRIEF HEAVY RAINS.

LAT...LON 4265 9114 4262 9114 4230 9158 4230 9199
      4265 9170
TIME...MOT...LOC 0429Z 220DEG 46KT 4260 9142

$$

DLF

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 Jan 28, 9:24 PM CST, 20 minutes earlier.

Area forecast discussion, Jan 28, 9:24 PM CST, 20 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
924 PM CST MON JAN 28 2013

.UPDATE...
UPDATED THE NPW JUST BEFORE 9 PM TO DROP THE CLARK AND SCOTLAND
COUNTIES. REPORTS FROM THAT AREA SUGGESTED VISIBILITIES WERE
IMPROVING ALTHOUGH SOME PATCHY FOG WAS STILL OCCURRING. THE REST
OF THE ADVISORY FOR THE SOUTHERN COUNTIES WAS EXTENDED TO 3 AM.
HOWEVER...RECENT OBS FROM KBRL SHOW VSBYS THERE UP TO 3SM. IF THIS
TREND CONTINUES PART OF THE ADVISORY WILL LIKELY BE DROPPED BEFORE
MIDNIGHT.

THUNDERSTORMS CONTINUE TO ERUPT OVER THE CENTRAL AND NORTHERN
CWFA. RADAR DATA SUGGESTS THAT SOME OF THE STORMS CONTAIN SMALL
HAIL BUT HAVE YET TO RECEIVE ANY REPORTS.

&&

.AVIATION... /ISSUED 822 PM CST MON JAN 28 2013/
 /ISSUED 614 PM CST MON JAN 28 2013/

IFR CONDITIONS WILL BE WIDESPREAD TONIGHT AHEAD OF THE WARM FRONT
LIFTING NORTH THROUGH THE AREA. THE FRONT SHOULD REACH THE HIGHWAY
20 CORRIDOR JUST AFTER MIDNIGHT. THERE IS SOME UNCERTAINTY ABOUT
HOW MUCH CONDITIONS WILL IMPROVE AFTER THE FRONT MOVES THROUGH.
THE AIRMASS SOUTH OF THE FRONT IS VERY MOIST AND IT WILL BE MOVING
OVER COLD GROUND...SO ONLY BUMPED CONDITIONS UP TO IFR AFTER THE FROPA.
SHOWERS AND THUNDERSTORMS WILL ALSO BE DEVELOPING ALONG AND NORTH
OF THE FRONT AS IT MOVES NORTH THIS EVENING. THE BEST POTENTIAL
FOR TSRA WILL BE FROM 03Z TO 09Z AND ALONG AND NORTH OF I80.
LOW LEVEL WINDSHEAR IS ALSO EXPECTED PARTICULARLY ALONG AND NORTH
OF THE WARM FRONT LATE THIS EVENING AND OVERNIGHT. SURFACE WINDS
WILL BE EAST TO SOUTHEAST AROUND 10KTS WITH WINDS AROUND 15HND
FEET INCREASING TO 40 TO 50 KTS FROM THE SOUTHWEST THIS EVENING.
THE WINDSHEAR THREAT WILL DIMINISH AFTER THE WARM FRONT MOVES
THROUGH AND THE SURFACE WINDS TURN SOUTH TO SOUTHWEST AND
INCREASE TO 10 TO 20 KTS.

A STRONG COLD FRONT WILL MOVE THROUGH THE AREA TUESDAY AFTERNOON
A LINE OF THUNDERSTORMS IS EXPECTED TO DEVELOP/INCREASE ALONG THE
FRONT ESPECIALLY AS IT REACHES THE MISSISSIPPI RIVER BY LATE AFTERNOON.

DLF

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...DENSE FOG ADVISORY UNTIL 3 AM CST TUESDAY FOR BENTON-BUCHANAN-
     CEDAR-CLINTON-DELAWARE-DES MOINES-DUBUQUE-HENRY IA-IOWA-
     JACKSON-JEFFERSON-JOHNSON-JONES-KEOKUK-LEE-LINN-LOUISA-
     MUSCATINE-SCOTT-VAN BUREN-WASHINGTON.

IL...DENSE FOG ADVISORY UNTIL 3 AM CST TUESDAY FOR BUREAU-CARROLL-
     HANCOCK-HENDERSON-HENRY IL-JO DAVIESS-MCDONOUGH-MERCER-
     PUTNAM-ROCK ISLAND-STEPHENSON-WARREN-WHITESIDE.

MO...NONE.
&&

DLF

Hazardous weather outlook, Jan 28, 2:43 PM CST, 7 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
243 PM CST MON JAN 28 2013

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-292045-
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-
243 PM CST MON JAN 28 2013

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

A DENSE FOG ADVISORY IS IN EFFECT FOR PORTIONS OF EASTERN
IA...WESTERN IL AND EXTREME NORTHEAST MO INTO EARLY THIS EVENING.
VISIBILITIES WILL BE OCCASIONALLY REDUCED TO 1/4 MILE OR LESS.

A WARM FRONT WILL LIFT NORTHWARD TONIGHT AND WILL SPREAD RAIN AND
EMBEDDED THUNDERSTORMS ACROSS THE OUTLOOK AREA. SOME OF THE
STRONGER STORMS MAY PRODUCE SMALL HAIL AND LOCALLY HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

A STRONG COLD FRONT PUSHING INTO AN UNSEASONABLY WARM AND MOIST
AIR MASS WILL TRIGGER WIDESPREAD SHOWERS AND THUNDERSTORMS ON TUESDAY.
SOME OF THE STRONGER STORMS MAY PRODUCE HAIL UP TO QUARTER SIZE
ALONG WITH SEVERAL INCHES OF RAINFALL...WHICH MAY CAUSE LOCALIZED
FLASH FLOODING.

LATE TUESDAY NIGHT AND WEDNESDAY...A STRENGTHENING STORM SYSTEM
COMBINED WITH MUCH COLDER AIR MAY PRODUCE SIGNIFICANT SNOW
ACCUMULATIONS ACROSS THE OUTLOOK AREA. STRONG WINDS OF 30 TO 40
MPH MAY ALSO ACCOMPANY THE SNOWFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THIS AFTERNOON OR TONIGHT.

HAASE/SHEETS

In the hours before

Special weather statement, Jan 28, 8:46 PM CST, 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
846 PM CST MON JAN 28 2013

ILZ017-018-290315-
BUREAU-PUTNAM-
846 PM CST MON JAN 28 2013

...THUNDERSTORM WITH SMALL HAIL...

AT 845 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 12 MILES SOUTHWEST OF HENNEPIN...OR 9 MILES
NORTHWEST OF LACON...MOVING NORTHEAST AT 45 MPH. HALF INCH DIAMETER
HAIL IS POSSIBLE WITH THIS STORM.

* THE THUNDERSTORM WILL BE NEAR...
  HENNEPIN AND 8 MILES NORTHWEST OF MC NABB AROUND 900 PM CST...
  DEPUE AND GRANVILLE AROUND 905 PM CST...
  DALZELL...SPRING VALLEY AND LADD AROUND 910 PM CST...

LAT...LON 4114 8917 4111 8933 4115 8934 4114 8963
      4117 8964 4153 8917
TIME...MOT...LOC 0246Z 227DEG 41KT 4114 8949

DLF

Local storm report, Jan 28, 9:33 PM CST, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
933 PM CST MON JAN 28 2013

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

0930 PM     HAIL             1 NW VAN HORNE          42.02N 92.11W
01/28/2013  M0.88 INCH       BENTON             IA   TRAINED SPOTTER

            DIME TO NICKEL SIZED HAIL FELL FOR ABOUT 1 MINUTE.

&&

Local storm report, Jan 28, 9:41 PM CST, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
941 PM CST MON JAN 28 2013

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

0937 PM     HAIL             6 NE VAN HORNE          42.08N 92.03W
01/28/2013  E0.75 INCH       BENTON             IA   TRAINED SPOTTER

            A FEW PENNY SIZED HAIL STONES...MOST SMALLER. ALSO HEAVY
            RAIN.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 28, 10:49 PM CST	Special Weather Statement	DVN	Buchanan, Delaware	56 min
Jan 29, 3:39 AM CST	Winter Storm Watch	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 13 more	12 hr
Jan 29, 3:46 AM CST	Flood Watch	DVN	Des Moines, Lee	14 hr
Jan 29, 9:55 AM CST	River Flood Warning	DVN	Delaware, Jones	39 hr
Jan 29, 3:18 PM CST	Winter Storm Warning	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 10 more	27 hr
Jan 29, 3:18 PM CST	Winter Weather Advisory	DVN	Des Moines, Henry, Lee, Louisa, Muscatine, Scott and 1 more	27 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2013 Every severe thunderstorm warning in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.