Severe Thunderstorm Warning 96, NWS Aberdeen, SD

529 
WWUS53 KABR 120338
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1038 PM CDT TUE JUL 11 2017

SDC029-057-120415-
/O.CON.KABR.SV.W.0096.000000T0000Z-170712T0415Z/
Hamlin SD-Codington SD-
1038 PM CDT TUE JUL 11 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHERN HAMLIN AND SOUTH CENTRAL CODINGTON COUNTIES...

At 1038 PM CDT, a severe thunderstorm was located near Thomas, or 11
miles southwest of Watertown, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Watertown, Castlewood, Hayti, Hazel, Thomas, Pelican Lake, Sandy
Shore Rec Area, Goose Lake, Memorial Park Camping Site and Lake
Kampeska.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4478 9744 4492 9727 4481 9691 4460 9717
TIME...MOT...LOC 0338Z 306DEG 18KT 4478 9729 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

Lueck

166 
WWUS53 KABR 120347
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1047 PM CDT TUE JUL 11 2017

SDC029-057-120415-
/O.CON.KABR.SV.W.0096.000000T0000Z-170712T0415Z/
Hamlin SD-Codington SD-
1047 PM CDT TUE JUL 11 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHERN HAMLIN AND SOUTH CENTRAL CODINGTON COUNTIES...

At 1047 PM CDT, a severe thunderstorm was located over Thomas, or 11
miles south of Watertown, moving southeast at 20 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Castlewood, Hayti, Thomas and Pelican Lake. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4474 9738 4489 9719 4481 9691 4460 9717
TIME...MOT...LOC 0347Z 309DEG 18KT 4475 9724 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

Lueck

761 
WWUS53 KABR 120400
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1100 PM CDT TUE JUL 11 2017

SDC029-057-120415-
/O.CON.KABR.SV.W.0096.000000T0000Z-170712T0415Z/
Hamlin SD-Codington SD-
1100 PM CDT TUE JUL 11 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHEASTERN HAMLIN AND SOUTH CENTRAL CODINGTON COUNTIES...

At 1059 PM CDT, a severe thunderstorm was located over Castlewood, or
12 miles south of Watertown, moving east at 30 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Castlewood and Thomas. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4474 9727 4487 9714 4481 9691 4462 9715
TIME...MOT...LOC 0359Z 287DEG 25KT 4474 9708 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

Lueck

033 
WWUS53 KABR 120405
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1105 PM CDT TUE JUL 11 2017

SDC029-057-120415-
/O.CON.KABR.SV.W.0096.000000T0000Z-170712T0415Z/
Hamlin SD-Codington SD-
1105 PM CDT TUE JUL 11 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHEASTERN HAMLIN AND SOUTH CENTRAL CODINGTON COUNTIES...

At 1104 PM CDT, a severe thunderstorm was located over Castlewood, or
12 miles northwest of Estelline, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Castlewood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4475 9718 4485 9707 4481 9691 4466 9710
TIME...MOT...LOC 0404Z 309DEG 18KT 4472 9705 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Lueck

418 
WWUS53 KABR 120411
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1111 PM CDT TUE JUL 11 2017

SDC029-057-120421-
/O.EXP.KABR.SV.W.0096.000000T0000Z-170712T0415Z/
Hamlin SD-Codington SD-
1111 PM CDT TUE JUL 11 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HAMLIN AND SOUTH
CENTRAL CODINGTON COUNTIES WILL EXPIRE AT 1115 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A severe thunderstorm watch remains in effect until midnight CDT for
northeastern South Dakota.

LAT...LON 4475 9718 4485 9707 4481 9691 4466 9710
TIME...MOT...LOC 0411Z 309DEG 18KT 4470 9702 

$$

Lueck

Area Forecast Discussion...UPDATED
National Weather Service Aberdeen SD
852 PM CDT Tue Jul 11 2017

.UPDATE...
Issued at 835 PM CDT Tue Jul 11 2017

Severe Thunderstorm Watch 409 was issued at appx 7pm cdt until 11
pm cdt for most of the counties east of the James River valley.
Some of the best instability and shear of the summer, so far, for
supercells. Higher than preferred LCL's this evening didn't
completely eliminate the tornado potential, but for sure the large
hail and strong wind potential has been realized this evening. So
far, 2 or 3 storms formed on the pre-frontal surface trof/dry-line
feature over the prairie coteau and began splitting. So far, very
large hail and winds up to 75 mph have been produced by these
storms as they make their way into Minnesota. Watertown received
some of the worst of the hail and wind, and heavy rain. Day and
Clark counties have been removed from the Watch, with the severe
weather threat diminishing there now. But, further east, the
threat for strong storms to develop/persist continues. Updates
are out.

UPDATE Issued at 610 PM CDT Tue Jul 11 2017

See below for an aviation forecast discussion for the 00Z TAFs.

&&

.SHORT TERM...(This Evening through Wednesday Afternoon)
Issued at 333 PM CDT Tue Jul 11 2017

Hot temperatures in the upper 90s to low 100s are currently residing
from the James valley westward into central SD. Dewpoints have mixed
out lower in many places, but still seeing scattered obs reporting
heat indices at or just above 100 degrees within portions of the
heat advisory. Will leave headline in place until its current
expiration time.

Also keeping an eye on the couple areas of cumulus across the region
for possible convective initiation. Unfortunately, a fairly low
confidence forecast in regards to timing and areal coverage of
storms later this afternoon and evening. It still appears best area
for strong to severe storms will be over northeast SD into west
central MN, generally east of the James River. Ribbon of moderate to
strong instability is setting up over eastern SD with sufficient
bulk shear. CAM solutions offer up no confidence as they vary
greatly in coverage and timing. The main theme though points to some
degree of development in the northeast counties later this afternoon
into the evening hours. Although, there are a few solutions showing
initiation further south from around Huron to Chamberlain, which is
where the cumulus field currently resides, so this is something to
watch. This would be within area of strongest daytime heating as
temps hover around 100 to 103 degrees. Any storms that do form this
afternoon and evening certainly may become severe with large hail
and damaging winds. An isolated tornado cannot be ruled out either,
mainly in the far northeast corner of the CWA where 0-1km shear is
the best.

Northerly winds and cooler temperatures are in store for Wednesday
behind the departing cool front. Although, it will still be warm
with highs mainly in the 80s. Dewpoints will be a bit lower for
eastern areas as the drier air mass works in.

.LONG TERM...(Wednesday Evening through Tuesday)
Issued at 333 PM CDT Tue Jul 11 2017

By 00Z Thursday, the 500mb pattern will show the 500mb low along
the Manitoba/Ontario border, with zonal flow giving way to ridging
from the west across our area. Expect the building ridge to our
west to slide directly overhead Friday through the weekend. It
will still remain nearby through early next week, but become
suppressed as low over the Gulf of Alaska moves into central
Canada. This will help support well above normal temperatures that
will be flirting with the 100 degree mark Friday through Tuesday.
At this time, Friday and Monday look to be the warmest days.

At the sfc, high pressure over southern Manitoba and northern ND
will continue to push a ridge across the forecast area through mid
day Friday as the high itself sinks across MN.

While a weak cold front slipping in from ND Friday night into
Saturday could bring isolated showers and storms to mainly north
central SD, not much is expected. Yet another sfc ridge will move in
for the rest of the weekend, exiting across MN Sunday. But what
about that day 7 forecast? Low pressure will be sliding into the
Central Plains later Monday, but it's nothing to get too excited
about quite yet.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday Evening)
Issued at 610 PM CDT Tue Jul 11 2017

VFR for the next 24 hours, except in/near TS which, according to
the radar/satellite imagery and latest available short-range
guidance, could be impacting/moving within the vicinity of the
KABR/KATY terminals over then next 3 to 6 hours. Have introduced
some VCTS mention for now. Looks like some convection developing
about 15 to 20 miles west of KATY at this time. So, amendments for
TEMPO TS may be forthcoming sooner than later for that terminal.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
&&

UPDATE...Dorn
SHORT TERM...TMT
LONG TERM...KF
AVIATION...Dorn

Hazardous Weather Outlook
National Weather Service Aberdeen SD
403 AM CDT Tue Jul 11 2017

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-120915-
Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-
Roberts-Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-
Codington-Grant-Hamlin-Deuel-Stanley-Sully-Hughes-Hyde-Hand-Jones-
Lyman-Buffalo-
403 AM CDT Tue Jul 11 2017 /303 AM MDT Tue Jul 11 2017/

This Hazardous Weather Outlook is for portions of west central
Minnesota, central South Dakota, north central South Dakota, and
northeast South Dakota.

.DAY ONE...Today and Tonight

The grassland fire danger will reach the high to very high
category today, along and west of the James valley. Expect south
to southwest winds ahead of a cold front, with winds speeds
topping out around 25mph. Behind the front, winds will be north to
northwest at 10 to 15mph.

The cold front will provide the focus for afternoon thunderstorms,
mainly along and east of the James river valley, including the
Sisseton hills region and into western Minnesota. Storms have the
potential to generate damaging winds and large hail. Storms will
track southeast through the evening departing the forecast area
during the early overnight hours.

Heat and humidity will combine to produce heat index values in the
upper 90s to low 100s before the front moves through.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

Connelly

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
823 PM CDT TUE JUL 11 2017

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

0747 PM     HAIL             4 E WATERTOWN           44.92N 97.09W
07/11/2017  M2.75 INCH       CODINGTON          SD   TRAINED SPOTTER

            PHOTO VIA SOCIAL MEDIA. APPROXIMATE LOCATION
            AND TIME.

&&

RL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
837 PM CDT TUE JUL 11 2017

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

0807 PM     HAIL             2 SSE PEEVER            45.51N 96.94W
07/11/2017  M1.00 INCH       ROBERTS            SD   PUBLIC

            SOCIAL MEDIA REPORT.

&&

RL

Special Weather Statement
National Weather Service Aberdeen SD
843 PM CDT TUE JUL 11 2017

MNZ039-SDZ008-120230-
Traverse MN-Roberts SD-
843 PM CDT TUE JUL 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL TRAVERSE AND
NORTHEASTERN ROBERTS COUNTIES UNTIL 930 PM CDT...

At 843 PM CDT, Doppler radar was tracking a strong thunderstorm over
Wheaton, moving east at 20 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Wheaton.

A severe thunderstorm watch remains in effect until 1100 PM CDT for
west central Minnesota...and northeastern South Dakota.

LAT...LON 4572 9626 4575 9652 4590 9658 4593 9625
TIME...MOT...LOC 0143Z 274DEG 18KT 4584 9647

KF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
854 PM CDT TUE JUL 11 2017

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

0749 PM     HAIL             3 E WATERTOWN           44.91N 97.11W
07/11/2017  M3.00 INCH       CODINGTON          SD   PUBLIC

            SEVERAL SOCIAL MEDIA PHOTOS/MEASUREMENTS.
            APPROXIMATE LOCATION AND RADAR ESTIMATED
            TIME.

&&

RL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
955 PM CDT TUE JUL 11 2017

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

0945 PM     HAIL             4 ESE LAKE NORDEN       44.57N 97.13W
07/11/2017  M1.00 INCH       HAMLIN             SD   TRAINED SPOTTER

&&

MC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
958 PM CDT TUE JUL 11 2017

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

0951 PM     HAIL             4 ESE LAKE NORDEN       44.57N 97.13W
07/11/2017  E1.00 INCH       HAMLIN             SD   PUBLIC

&&

MC