Alert archive / Wisconsin / Special Weather Statements in 2020

Special Weather Statement, NWS La Crosse, WI

July 9, 2020Grant County, Wisconsin

NWS La Crosse, WI issued this special weather statement at Jul 9, 2020, 1:17 PM CDT for Grant County, Wisconsin. It was in force for 58 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 9, 2020, 1:17 PM CDT (18:17 UTC)
Expired: Jul 9, 2020, 2:15 PM CDT
In force: 58 min
Issued by: NWS La Crosse, WI

County Grant County, WI

The radar

The Quad Cities radar (KDVN), 110 km from the middle of the area, began a volume at 18:21 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 109 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: 1056 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Jul 9, 12:15 PM CDT, 1 hour 2 minutes earlier.

Area forecast discussion, Jul 9, 12:15 PM CDT, 1 hour 2 minutes before

Area Forecast Discussion
National Weather Service La Crosse WI
1215 PM CDT Thu Jul 9 2020

.SHORT TERM...(Today and tonight)
Issued at 253 AM CDT Thu Jul 9 2020

Water vapor imagery early this morning depicts a closed low located
over Saskatchewan/Manitoba and a few shortwave troughs out ahead of
it across the Upper Midwest and central Plains. Some scattered
showers and storms associated with one of the shortwaves were
observed across north-central Wisconsin early this morning, though
activity continues to push east. At the surface, a cold front is
draped from northern Minnesota southwestward into western Nebraska,
with it expected to progress eastward across the area today. Models
continue to depict that a MCV associated with remnant convection
over South Dakota/Nebraska will drift eastward across Iowa and merge
with the surface cold front by this afternoon, allowing convection
to develop into along these features. With moisture remaining high
across the area (dewpoints in the upper 60s to low 70s), there will
be the potential for a few strong storms at times this afternoon
into this evening. Models depict pretty good instability across the
area this afternoon, with CAPE values generally 2000+ J/kg, though
there looks to be little shear present - at most maybe 20 kts in the
0-3 km layer. Any thunderstorms that do develop will be efficient
rain producers with warm cloud depths between 3-4 km and
precipitable waters nearing 2 inches for some. Because of this, the
primary threats with any stronger storms look to be locally heavy
rain and gusty winds. Mid-level lapse rates will be around 7-8 C/km,
so hail development will also be possible in any stronger storms.
Cannot completely rule out a few severe storms, though with weak
shear, they would be more pulsey in nature. Primary severe weather
hazards would be strong wind gusts and possibly some hail with
collapsing cores.

High temperatures today will be in the 80s, with overnight lows in
the 60s.

.LONG TERM...(Friday through Wednesday)
Issued at 253 AM CDT Thu Jul 9 2020

After a brief break from the rain chances Friday, these will
quickly return for the weekend. A short wave trough coming across
the upper level ridge is expected to drop across the region
Saturday and Saturday night in a developing northwest flow regime.
This has been a consistent signal from the models for a several
runs now, along with the differences in how strong this wave will
be. Both the 09.00Z NAM and GFS begin to strengthen this wave once
it gets past the ridge axis over the northern Rockies Friday
afternoon and then continue to strengthen it with an open upper
level low forming as it moves across the Upper Midwest. The 09.00Z
ECMWF does not show near the strengthening of the other two models
and tracks the wave more across the Great Lakes. While the 09.00Z
GEM has the short wave trough farther southwest than any of the
other models, it does lend support to the ECMWF solution of not
showing nearly as much strengthening of the wave. As a result,
will trend toward the less amplified solutions for now and keep
the rain chances in the 30 to 50 percent range. The potential for
severe weather looks to relatively low with this system. Clouds
should spread over the area limiting the amount of heating and
keeping the ML CAPE at or below 1000 J/kg. Deep layer shear looks
to be lacking as well with maybe around 20 knots in the 0-3km
layer to work with.

The upper level ridge should briefly build back over the region
for another short period of dry weather Sunday night into Monday.
The ridge should then get flattened as a large upper level low
moves across central Canada and re-establishes the westerlies over
the northern part of the country with the flow turning to the
southwest by early next week. This should bring a short wave
trough across the region Monday night followed by a potentially
stronger wave for Tuesday night into Wednesday. These wave will
return the chance for rain to the area for the first part of next
week.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1215 PM CDT Thu Jul 9 2020

Scattered storms will be ongoing this afternoon but are expected
to push east this evening. Very heavy downpours/temporary severe
reductions in visibility can be expected under these storms.
Otherwise, expecting prevailing VFR conditions. Also plan on
variable winds, gusty in any storms, becoming northwest 10kt or
less toward Friday morning.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
IA...None.
&&

SHORT TERM...NMB
LONG TERM...04
AVIATION...DAS

Hazardous weather outlook, Jul 9, 5:07 AM CDT, 8 hours 10 minutes before

Hazardous Weather Outlook
National Weather Service La Crosse WI
507 AM CDT Thu Jul 9 2020

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-101100-
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-
507 AM CDT Thu Jul 9 2020

This Hazardous Weather Outlook is for portions of southeast
Minnesota...northeast Iowa and southwest into central Wisconsin.

.DAY ONE...Today and Tonight

Thunderstorms are expected across the area today and tonight. Some
of these could be strong to locally severe with heavy rain,
damaging winds, and hail.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Additional chances for storms are possible this weekend and again
from Monday night into the middle of next week. Organized severe
weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated. Rainfall reports would be
appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

NMB/04

In the hours before

Special weather statement, Jul 9, 11:40 AM CDT, 1 hour 37 minutes before

Special Weather Statement
National Weather Service La Crosse WI
1140 AM CDT Thu Jul 9 2020

IAZ008-018-091730-
Floyd-Mitchell-
1140 AM CDT Thu Jul 9 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT MITCHELL AND FLOYD
COUNTIES...

At 1136 AM CDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles north of Mason City to near
Allison, IA. Movement was north at 35 mph.

Wind gusts up to 50 mph and penny size hail are possible with these
storms. Heavy downpours are also possible.

Locations impacted include...
Charles City, Osage, Nashua, St. Ansgar, Rockford, Riceville, Lyle,
Stacyville, Rudd, Floyd, Marble Rock, Mitchell, McIntire, Carpenter,
Colwell, Orchard, Toeterville, County Roads B 60 And T 18, Rock Creek
and Idlewilde State Park.

If outdoors, seek shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4350 9303 4350 9255 4291 9255 4291 9302
TIME...MOT...LOC 1636Z 198DEG 30KT 4322 9344 4267 9291

Lee

Local storm report, Jul 9, 12:00 PM CDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
1200 PM CDT THU JUL 9 2020

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

1034 AM     HEAVY RAIN       6 W GOODRICH            45.14N 90.20W
07/09/2020  M1.31 INCH       TAYLOR             WI   PUBLIC

1150 AM     HEAVY RAIN       3 NNE ROCHESTER         44.05N 92.45W
07/09/2020  M1.41 INCH       OLMSTED            MN   MESONET

            MESONET STATION FW2899 ROCHESTER.

1145 AM     HEAVY RAIN       3 NE ROCHESTER          44.04N 92.44W
07/09/2020  M1.34 INCH       OLMSTED            MN   MESONET

            MESONET STATION EW0729 ROCHESTER.

1100 AM     HEAVY RAIN       1 W ORONOCO             44.17N 92.55W
07/09/2020  M1.00 INCH       OLMSTED            MN   MESONET

            MESONET STATION ONOM5 1 W ORONOCO.

&&

Special weather statement, Jul 9, 12:13 PM CDT, 1 hour 4 minutes before

Special Weather Statement
National Weather Service La Crosse WI
1213 PM CDT Thu Jul 9 2020

IAZ011-MNZ088-095-096-WIZ032>034-041>044-053>055-091930-
Allamakee-Winona-Fillmore-Houston-Buffalo-Trempealeau-Jackson-
La Crosse-Monroe-Juneau-Adams-Vernon-Crawford-Richland-
Including the cities of Waukon, Winona, Preston, Caledonia, Alma,
Arcadia, Whitehall, Black River Falls, La Crosse, Sparta, Tomah,
Mauston, Friendship, Viroqua, Prairie Du Chien,
and Richland Center
1213 PM CDT Thu Jul 9 2020

...Scattered Strong Thunderstorms in Southeast Minnesota, far
Northeast Iowa, and Southwest into Central Wisconsin...

Scattered thunderstorms will continue across portions of the area
this afternoon. A few stronger storms will be capable of
producing wind gusts in excess of 40 mph along with penny sized
hail. Move indoors if storms approach your location.

In addition, torrential rainfall is occurring with these storms
and may cause poor visibility, ponding of water on roads, or
localized flooding. Take it slow if driving and never drive your
vehicle through flooded roadways.

CA

Local storm report, Jul 9, 12:57 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
1257 PM CDT THU JUL 9 2020

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

1235 PM     HEAVY RAIN       1 NNE ROCHESTER         44.02N 92.47W
07/09/2020  M1.42 INCH       OLMSTED            MN   MESONET

&&

Local storm report, Jul 9, 1:01 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
101 PM CDT THU JUL 9 2020

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

1255 PM     TSTM WND GST     COLWELL                 43.16N 92.60W
07/09/2020  M48 MPH          FLOYD              IA   TRAINED SPOTTER

            0.5 INCHES OF RAIN ALSO REPORTED.

&&

Special weather statement, Jul 9, 1:17 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service La Crosse WI
117 PM CDT Thu Jul 9 2020

WIZ061-091915-
Grant-
117 PM CDT Thu Jul 9 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN GRANT COUNTY...

At 116 PM CDT, a strong thunderstorm was located near Dickeyville, or
8 miles northeast of Dubuque, moving north at 20 mph.

Wind gusts up to 50 mph and penny size hail are possible with this
storm.

Locations impacted include...
Platteville, Cuba City, Hazel Green, Dickeyville, Georgetown, Potosi,
Tennyson, Cornelia, Kieler, Sinsinawa, and Big Patch.

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4254 9064 4256 9066 4257 9066 4258 9068
      4263 9071 4276 9071 4280 9043 4251 9042
      4251 9064
TIME...MOT...LOC 1816Z 180DEG 18KT 4257 9054

CA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 5:06 AM CDT	Special Weather Statement	ARX	Buffalo	24 min
Jul 9, 5:55 AM CDT	Special Weather Statement	ARX	Taylor	35 min
Jul 9, 2:29 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Vernon	61 min
Jul 9, 3:16 PM CDT	Special Weather Statement	ARX	Grant	59 min
Jul 9, 3:32 PM CDT	Special Weather Statement	ARX	La Crosse, Richland, Vernon	28 min
Jul 9, 4:19 PM CDT	Areal Flood Advisory	ARX	La Crosse	3 hr
Jul 9, 4:28 PM CDT	Special Weather Statement	ARX	Grant	62 min
Jul 9, 5:35 PM CDT	Special Weather Statement	ARX	Adams	55 min
Jul 9, 11:40 AM CDT	Special Weather Statement	ARX	Floyd, Mitchell	50 min
Jul 9, 11:48 AM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	72 min
Jul 9, 1:18 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Fayette	87 min
Jul 9, 1:35 PM CDT	Special Weather Statement	ARX	Winneshiek	55 min
Jul 9, 1:44 PM CDT	Severe Thunderstorm Warning	ARX	Winneshiek	61 min
Jul 9, 2:07 PM CDT	Special Weather Statement	ARX	Clayton	53 min
Jul 9, 11:16 AM CDT	Areal Flood Advisory	ARX	Olmsted	3 hr
Jul 9, 2:57 PM CDT	Severe Thunderstorm Warning	ARX	Houston	40 min

Nearby

Special Weather Statements in Wisconsin, 2020 Every special weather statement in 2020

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.