Alert archive / Iowa / Special Weather Statements in 2014

Special Weather Statement, NWS La Crosse, WI

August 19, 2014Dubuque County, Iowa

NWS La Crosse, WI issued this special weather statement at Aug 19, 2014, 1:55 AM CDT for Dubuque County, Iowa. It was in force for 50 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 19, 2014, 1:55 AM CDT (06:55 UTC)
Expired
Aug 19, 2014, 2:45 AM CDT
In force
50 min
Issued by
NWS La Crosse, WI

County Dubuque County, IA

The radar

The Quad Cities radar (KDVN), 114 km from the middle of the area, began a volume at 06:55 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 6.9 hours before the alert went out and 295 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, Green Bay/Straub, WI at 00:00Z on 2014-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 76 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, Green Bay/Straub, WI at 00:00Z on 2014-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.193958Sfc1 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
76 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
830 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
14 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 La Crosse, WI wrote its last area forecast discussion before this special weather statement went out at Aug 18, 11:57 PM CDT, 1 hour 58 minutes earlier.

Area forecast discussion, Aug 18, 11:57 PM CDT, 1 hour 58 minutes before
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Hazardous weather outlook, Aug 18, 7:45 PM CDT, 6 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LA CROSSE WI
745 PM CDT MON AUG 18 2014

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-191200-
MITCHELL-HOWARD-WINNESHIEK-ALLAMAKEE-FLOYD-CHICKASAW-FAYETTE-
CLAYTON-WABASHA-DODGE-OLMSTED-WINONA-MOWER-FILLMORE-HOUSTON-
TAYLOR-CLARK-BUFFALO-TREMPEALEAU-JACKSON-LA CROSSE-MONROE-JUNEAU-
ADAMS-VERNON-CRAWFORD-RICHLAND-GRANT-
745 PM CDT MON AUG 18 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
IOWA...SOUTHEAST MINNESOTA...AND SOUTHWEST INTO CENTRAL
WISCONSIN.

.DAY ONE...TONIGHT

ROUNDS OF THUNDERSTORMS WILL CONTINUE THROUGH THE EVENING...DIMINISHING
AFTER MIDNIGHT. A ROUND OF STORMS WAS ORGANIZING JUST EAST OF
INTERSTATE 35 EARLY THIS EVENING...AND IT WILL SHIFT EAST ACROSS
SOUTHEAST MINNESOTA AND PARTS OF NORTHEAST IOWA THROUGH MID-EVENING.
THIS ROUND IS EXPECTED TO MOVE INTO WESTERN AND CENTRAL WISCONSIN
FOR THE LATTER PART OF THE EVENING. AHEAD OF THESE STORMS TO THE
EAST...ISOLATED STORMS WILL CONTINUE.

ISOLATED SEVERE STORMS ARE POSSIBLE THROUGH THE EVENING WITH THE
MAIN THREATS DAMAGING WIND AND LARGE HAIL. WHILE BRIEF HEAVY RAIN
IS LIKELY WITH ANY STRONG STORM...FLOODING WILL BE ISOLATED AND
LESS LIKELY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

A CHANCE OF THUNDERSTORMS CONTINUES INTO TUESDAY WITH LIGHTNING
THE MAIN HAZARD.

AREAS OF FOG COULD DEVELOP WEDNESDAY MORNING...REDUCING
VISIBILITIES TO AS LOW AS 1/4 MILE IN SPOTS.

MORE THUNDERSTORMS ARE POSSIBLE WEDNESDAY NIGHT THROUGH THE
WEEKEND. IT IS TOO EARLY TO DISCERN THE SEVERE WEATHER POTENTIAL
WITH THE STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE THIS EVENING SHOULD A MORE
WIDESPREAD THREAT OF STORMS PRESENT ITSELF OVER A GIVEN AREA.

.EMERGENCY MANAGEMENT COORDINATION...

NO WEBINAR IS SCHEDULED.

DB

In the hours before

Local storm report, Aug 18, 10:38 PM CDT, 3 hours 17 minutes before
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Local storm report, Aug 18, 10:51 PM CDT, 3 hours 4 minutes before
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Special weather statement, Aug 18, 10:58 PM CDT, 2 hours 57 minutes before
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Special weather statement, Aug 18, 11:29 PM CDT, 2 hours 26 minutes before
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Special weather statement, Aug 19, 12:34 AM CDT, 1 hour 21 minutes before
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Special weather statement, Aug 19, 1:55 AM CDT, 0 minutes before
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The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 18, 9:05 PM CDTSevere Thunderstorm WarningARXLa Crosse, Vernon40 min
Aug 18, 9:07 PM CDTSpecial Weather StatementARXTaylor23 min
Aug 18, 9:25 PM CDTSpecial Weather StatementARXTrempealeau35 min
Aug 18, 9:30 PM CDTSevere Thunderstorm WarningARXAdams, Juneau45 min
Aug 18, 9:33 PM CDTAreal Flood AdvisoryARXLa Crosse, Trempealeau117 min
Aug 18, 10:04 PM CDTSpecial Weather StatementARXMonroe, Vernon56 min
Aug 18, 10:33 PM CDTSpecial Weather StatementARXMonroe, Vernon57 min
Aug 18, 10:58 PM CDTSpecial Weather StatementARXAdams, Crawford, Grant, Juneau, Richland, Vernon62 min
Aug 18, 11:29 PM CDTSpecial Weather StatementARXAdams, Grant, Richland, Sauk61 min
Aug 19, 12:34 AM CDTSpecial Weather StatementARXGrant86 min
Aug 19, 4:05 AM CDTDense Fog AdvisoryARXClark, Jackson, Taylor3 hr
Aug 18, 8:50 PM CDTSpecial Weather StatementARXAllamakee, Howard, Winneshiek25 min
Aug 18, 9:11 PM CDTSevere Thunderstorm WarningARXHoward31 min
Aug 18, 9:40 PM CDTSpecial Weather StatementARXMitchell35 min
Aug 18, 7:35 PM CDTSevere Thunderstorm WarningARXDodge, Olmsted, Wabasha40 min
Aug 18, 8:20 PM CDTSevere Thunderstorm WarningARXOlmsted, Wabasha40 min
Aug 18, 8:24 PM CDTSevere Thunderstorm WarningARXMower51 min

Nearby

Special Weather Statements in Iowa, 2014Every special weather statement in 2014

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.