Special Weather Statement, NWS Indianapolis, IN

Area Forecast Discussion
National Weather Service Indianapolis IN
630 PM EDT Fri Jun 30 2017

.UPDATE...
The AVIATION Section has been updated below.

&&

.SYNOPSIS...
Issued at 205 PM EDT Fri Jun 30 2017

A cold front is expected to move through late tonight. In the wake
of this front, high pressure is expected to move into the area over
the weekend and on into early next week. A frontal system may affect
the area towards the middle of next week.

&&

.NEAR TERM /Rest of This Afternoon and Tonight/...
Issued at 205 PM EDT Fri Jun 30 2017

Appears convectively induced vorticity center presently moving into
southwest Illinois, with convection increasing ahead of this
feature. Short term models suggest this vorticity center will pass
across the local area late this afternoon and into the evening
hours, eventually moving off into Ohio around 010500Z. Air mass
continues to be quite unstable for strong convection, but deep layer
shear remain weak. Shear may increase some later this afternoon as
vorticity center approches.

Highest PoPs appear to be from the mid afternoon hours into the
evening hours coinciding with best instability and lift, with PoPs
tapering off by the late evening hours and overnight.

Doesn't appear there is much of a precipitation chance late tonight
in the wake of upper air feature, but will keep a small PoP going as
a surface front moves through.

Low level thicknesses suggest the GFS MOS lows tonight may be a
little on the cool side. Will nudge up the guidance a category.

&&

.SHORT TERM /Saturday through Monday/...
Issued at 205 PM EDT Fri Jun 30 2017

Model guidance suggest broad troughing will push across the Great
Lakes this weekend, with heights rising by Monday as this feature
lifts off to the east. A couple of weak upper waves, one arriving
around Saturday and another Sunday afternoon and night, coupled with
an increasing warm advection pattern by Monday, offer some
precipitation potential, but nothing really stands out in the model
data at this point.

Will keep some small chance PoPs in the forecast for Saturday, and
for Sunday night and Monday to cover based on above.

Progged low level thicknesses suggest the GFS MOS high for Saturday
look too warm. Will nudge the guidance highs down a category.
The remainder of the periods look OK for now.

&&

.LONG TERM /Monday Night through Friday|/...

Issued at 151 PM EDT Fri Jun 30 2017

ECMWF generally keeps NW flow aloft in place through this period.
Best chances for precip appear to be on Tuesday as ECMWF suggests
and upper low pushing across Central Indiana with the flow aloft.
A surface low and favorable lower level features also accompany
this system. Thus best confidence for rain will be on Tuesday.

Forecast builder then inserts pops for much of next week.
Confidence in these pops are low. This is because the ECMWF keeps
mainly a NW flow of cooler air in place...and best forcing and
any dynamics within this flow remain well north of Central
Indiana. With the cooler NW flow in place...daily temperatures
should remain at or below normals and confidence is high in that.

&&

.AVIATION /Discussion for the 010000Z TAF Issuance/...
Issued at 420 PM EDT Fri Jun 30 2017

Good confidence in widespread thunderstorms with MVFR conditions
through 01-02z. Then, expect less thunderstorm coverage through 05-
6z and mostly VFR conditions. After that, could see some MVFR fog
through 12z or so. Finally, would not rule out more storms after
daybreak but coverage too low to mention that far out.

Southwest winds will be 10 knots or less tonight. Then, winds will
shift to the west 14z-18z as a cold front drop southeast over the
terminals.

&&

.IND WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SYNOPSIS...JAS
NEAR TERM...JAS
SHORT TERM...JAS
LONG TERM....Puma
AVIATION...MK

Hazardous Weather Outlook
National Weather Service Indianapolis IN
431 PM EDT Fri Jun 30 2017

INZ021-028>031-035>049-051>057-060>065-067>072-011000-
Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone-
Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam-
Hendricks-Marion-Hancock-Henry-Vigo-Clay-Owen-Morgan-Johnson-Shelby-
Rush-Sullivan-Greene-Monroe-Brown-Bartholomew-Decatur-Knox-Daviess-
Martin-Lawrence-Jackson-Jennings-
Including the cities of Lafayette, Frankfort, Kokomo,
Crawfordsville, Anderson, Muncie, Indianapolis, Terre Haute,
Shelbyville, Bloomington, Columbus, Vincennes, Bedford, and Seymour
431 PM EDT Fri Jun 30 2017

This hazardous weather outlook is for central Indiana.

.DAY ONE...Tonight.

Outlook: Severe thunderstorms possible.

Hazards: Damaging winds, lightning, large hail, torrential rain.

Timing: Through about 10 PM.

Discussion: A front will trigger numerous storms. The best chance of
severe weather should be from late this afternoon into the evening
hours.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Outlook: There will be some chance of thunderstorms most of the time
except on Sunday. It is too early to say if any storms are going to
be severe.

Discussion: The jet stream over Indiana will be unusually strong for
this time of year, causing a persistent chance of storms.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

&&

More information, along with other weather, hydrological and climate
information can be found at http://weather.gov/ind

Special Weather Statement
National Weather Service Indianapolis IN
352 PM EDT FRI JUN 30 2017

INZ046-047-054-302015-
Morgan IN-Hendricks IN-Marion IN-
352 PM EDT FRI JUN 30 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL MORGAN...
SOUTHEASTERN HENDRICKS AND MARION COUNTIES UNTIL 415 PM EDT...

At 352 PM EDT, Doppler radar was tracking a strong thunderstorm near
Plainfield, or 19 miles southwest of Indianapolis, moving northeast
at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Indianapolis, Lawrence, Plainfield, Beech Grove, Speedway,
Mooresville, Danville, Avon, Meridian Hills, Warren Park, Clermont,
Monrovia, Clayton, Rocky Ripple, Williams Creek, Wynnedale, Spring
Hill, Crows Nest, North Crows Nest and Monument Circle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3974 8596 3955 8649 3970 8660 3993 8614
      3993 8611
TIME...MOT...LOC 1952Z 241DEG 34KT 3966 8646

50

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
457 PM EDT FRI JUN 30 2017

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

0456 PM     HEAVY RAIN       INDIANAPOLIS INT'L AIRP 39.72N 86.29W
06/30/2017  M1.41 INCH       MARION             IN   ASOS

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
502 PM EDT FRI JUN 30 2017

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

0437 PM     HEAVY RAIN       3 NNE EAGLE CREEK RESER 39.88N 86.28W
06/30/2017  M1.14 INCH       MARION             IN   BROADCAST MEDIA

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
604 PM EDT FRI JUN 30 2017

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

0600 PM     HEAVY RAIN       2 S CASTLETON           39.88N 86.05W
06/30/2017  M1.83 INCH       MARION             IN   CO-OP OBSERVER

            1.48" OF THE TOTAL FELL IN ONE HOUR.

&&

Special Weather Statement
National Weather Service Indianapolis IN
655 PM EDT FRI JUN 30 2017

INZ042-302330-
Randolph IN-
655 PM EDT FRI JUN 30 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN RANDOLPH COUNTY UNTIL
730 PM EDT...

At 654 PM EDT, Doppler radar was tracking a strong thunderstorm near
Winchester, or 19 miles north of Centerville, moving northeast at 35
mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Winchester, Union City and Lynn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4000 8491 4001 8505 4012 8514 4029 8480
      4004 8481
TIME...MOT...LOC 2254Z 235DEG 32KT 4010 8500

50