Alert archive / Indiana / Special Weather Statements in 2017

Special Weather Statement, NWS Indianapolis, IN

July 23, 2017Knox County, Indiana

NWS Indianapolis, IN issued this special weather statement at Jul 23, 2017, 1:38 AM EDT for Knox County, Indiana. It was in force for 52 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 23, 2017, 1:38 AM EDT (05:38 UTC)
Expired: Jul 23, 2017, 2:30 AM EDT
In force: 52 min
Issued by: NWS Indianapolis, IN

County Knox County, IN

The radar

The Evansville,IN radar (KVWX), 45 km from the middle of the area, began a volume at 05:41 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

Lincoln, IL (KILX), launched 00:00Z, 5.6 hours before the alert went out and 198 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: 2392 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1185 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

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 Indianapolis, IN wrote its last area forecast discussion before this special weather statement went out at Jul 23, 12:26 AM EDT, 1 hour 12 minutes earlier.

Area forecast discussion, Jul 23, 12:26 AM EDT, 1 hour 12 minutes before

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Hazardous weather outlook, Jul 22, 5:17 PM EDT, 8 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service Indianapolis IN
517 PM EDT Sat Jul 22 2017

INZ021-028>031-035>049-054>057-063>065-232130-
Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone-
Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam-
Hendricks-Marion-Hancock-Henry-Morgan-Johnson-Shelby-Rush-Brown-
Bartholomew-Decatur-
Including the cities of Lafayette, Frankfort, Kokomo,
Crawfordsville, Anderson, Muncie, Indianapolis, Shelbyville,
and Columbus
517 PM EDT Sat Jul 22 2017

This hazardous weather outlook is for central Indiana.

.DAY ONE...Tonight.

Outlook: There is a threat for severe thunderstorms...especially
late this evening into tonight.

Hazards: Damaging winds, heavy rain and localized flooding, isolated
tornadoes, large hail, and dangerous lightning. High heat indices
up to 100 this evening.

Timing: Best chances for severe storms are expected from late
evening into tonight. The highest heat indices will occur into the
early evening.

Discussion: Thunderstorms are expected to develop late this
evening and tonight ahead of a cold front. Hot and humid conditions
are expected through the evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Outlook: Scattered thunderstorms are possible Sunday and Sunday
evening (southern counties). A few of these storms could be severe.
Scattered thunderstorms will also be possible again at times from
Wednesday night through Friday. Damaging winds and large hail, along
with heavy rainfall producing flash flooding, are the primary
threats.

Discussion: A secondary frontal boundary will bring the chance for
thunderstorms Sunday and Sunday evening (southern counties). The
next chance for thunderstorms will come on Wednesday night ahead of a
cold front dropping south from the Great Lakes.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible through tonight.

&&

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

INZ051>053-060>062-067>072-232130-
Vigo-Clay-Owen-Sullivan-Greene-Monroe-Knox-Daviess-Martin-Lawrence-
Jackson-Jennings-
Including the cities of Terre Haute, Bloomington, Vincennes,
Bedford, and Seymour
517 PM EDT Sat Jul 22 2017

This hazardous weather outlook is for central Indiana.

.DAY ONE...Tonight.

Outlook: There is a threat for severe storms...especially this
evening into the overnight. Hot conditions expected this evening. A
heat advisory is in effect until 7 pm.

Hazards: Damaging winds, heavy rain and localized flooding,
lightning, heat and heat related illnesses with heat indices of 105
to 108 degrees.

Timing: Best chances for severe storms are expected primarily this
evening into tonight. The highest heat indices will occur into the
early evening.

Discussion: Thunderstorms are expected to develop late this evening
and tonight ahead of a cold front. Hot and humid conditions are
expected yet again through this evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Outlook: Scattered thunderstorms are possible Sunday and Sunday
evening. A few of these storms could be severe. Scattered
thunderstorms will also be possible again at times from Wednesday
night through Friday. Damaging winds and large hail, along with heavy
rainfall producing flash flooding, are the primary threats.

Discussion: A secondary frontal boundary will bring the chance for
thunderstorms Sunday and Sunday evening. The next chance for
thunderstorms will come on Wednesday night ahead of a cold front
dropping south from the Great Lakes.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible through tonight and again Sunday.

&&

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

In the hours before

Special weather statement, Jul 22, 8:03 PM EDT, 5 hours 35 minutes before

Special Weather Statement
National Weather Service Indianapolis IN
803 PM EDT SAT JUL 22 2017

INZ051>054-060-062-230045-
Owen IN-Clay IN-Morgan IN-Vigo IN-Sullivan IN-Monroe IN-
803 PM EDT SAT JUL 22 2017

...SPECIAL WEATHER STATEMENT...

At 802 PM EDT, Doppler radar was tracking a strong thunderstorm 12
miles north of Sullivan, or 13 miles south of Terre Haute, moving
east at 25 mph.

Winds in excess of 30 mph will be possible with this storm.

Locations impacted include...
Bloomington, Spencer, Ellettsville, Shelburn, Prairieton, Prairie
Creek, Farmersburg, Clay City, Gosport, Hymera, Fairbanks, Paragon,
Stinesville, Coal City, Indiana University, Bowling Green, McCormicks
Creek State Park, Freedom, Patricksburg and Coalmont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3922 8757 3924 8758 3938 8753 3940 8649
      3913 8650 3914 8668 3917 8668 3917 8718
      3919 8760
TIME...MOT...LOC 0002Z 271DEG 22KT 3927 8740

DWM

Special weather statement, Jul 22, 11:40 PM EDT, 1 hour 58 minutes before

Special Weather Statement
National Weather Service Indianapolis IN
1140 PM EDT SAT JUL 22 2017

INZ052-053-060>062-230430-
Owen IN-Clay IN-Greene IN-Sullivan IN-Monroe IN-
1140 PM EDT SAT JUL 22 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MONROE...SULLIVAN...
SOUTHERN CLAY...OWEN AND GREENE COUNTIES UNTIL 1230 AM EDT...

At 1139 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles southeast of Brazil to 8 miles
northeast of Sullivan to near Eaton. Movement was southeast at 35
mph.

Half inch hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Linton, Sullivan, Bloomfield, Spencer, Ellettsville, Jasonville,
Worthington, Shelburn, Dugger, Clay City, Gosport, Hymera, Lyons,
Carlisle, Switz City, Center Point, Merom, Stinesville, Freedom and
Saline City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3919 8735 3926 8727 3926 8724 3929 8724
      3948 8702 3947 8689 3937 8663 3934 8663
      3932 8652 3900 8685 3890 8752 3896 8751
      3899 8758 3906 8757 3909 8762 3910 8762
      3911 8765 3912 8763 3914 8766
TIME...MOT...LOC 0339Z 294DEG 29KT 3943 8697 3916 8728 3907 8786

Ryan

Special weather statement, Jul 23, 12:39 AM EDT, 59 minutes before

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Special weather statement, Jul 23, 1:25 AM EDT, 13 minutes before

Special Weather Statement
National Weather Service Indianapolis IN
125 AM EDT SUN JUL 23 2017

INZ051>053-060-061-230615-
Owen IN-Clay IN-Greene IN-Vigo IN-Sullivan IN-
125 AM EDT SUN JUL 23 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN VIGO...NORTHEASTERN
SULLIVAN...SOUTHWESTERN CLAY...SOUTHWESTERN OWEN AND NORTHWESTERN
GREENE COUNTIES UNTIL 215 AM EDT...

At 125 AM EDT, Doppler radar was tracking a strong thunderstorm 10
miles northeast of West Union, or 11 miles southeast of Marshall,
moving east at 50 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Bloomfield, Jasonville, Worthington, Shelburn, Prairieton, Prairie
Creek, Farmersburg, Clay City, Hymera, Fairbanks, Switz City, Coal
City, Freedom, Coalmont, Pimento and Vicksburg.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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 3934 8758 3934 8756 3935 8753 3940 8753
      3923 8685 3899 8693 3923 8758 3925 8757
      3926 8758 3925 8760 3927 8760 3928 8761
      3930 8760 3931 8761
TIME...MOT...LOC 0525Z 290DEG 42KT 3931 8751

Ryan

Special weather statement, Jul 23, 1:38 AM EDT, 0 minutes before

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The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 8:03 PM EDT	Special Weather Statement	IND	Monroe, Owen	42 min
Jul 22, 8:25 PM EDT	Severe Thunderstorm Warning	IND	Clay, Greene, Sullivan, Vigo	21 min
Jul 22, 11:25 PM EDT	Areal Flood Warning	IND	Clay, Greene, Owen, Sullivan, Vigo	3 hr
Jul 22, 11:40 PM EDT	Special Weather Statement	IND	Clay, Greene, Owen, Sullivan	50 min
Jul 23, 12:39 AM EDT	Special Weather Statement	IND	Sullivan	51 min
Jul 23, 1:18 AM EDT	Flash Flood Warning	IND	Clay, Greene, Sullivan, Vigo	3 hr
Jul 23, 1:25 AM EDT	Special Weather Statement	IND	Greene	50 min
Jul 23, 2:06 AM EDT	Flash Flood Warning	IND	Lawrence, Martin	3 hr
Jul 23, 4:50 AM EDT	Areal Flood Advisory	IND	Lawrence, Martin	3 hr
Jul 23, 6:10 AM EDT	Flash Flood Warning	IND	Daviess, Martin	3 hr
Jul 23, 6:37 AM EDT	Severe Thunderstorm Warning	IND	Knox	38 min
Jul 23, 7:34 AM EDT	Special Weather Statement	IND	Daviess	41 min
Jul 23, 7:52 AM EDT	Areal Flood Warning	IND	Daviess, Knox, Sullivan	3 hr
Jul 23, 8:25 AM EDT	Areal Flood Warning	IND	Daviess, Greene, Lawrence, Martin	3 hr
Jul 23, 9:09 AM EDT	Areal Flood Warning	IND	Daviess, Martin	3 hr
Jul 23, 11:14 AM EDT	River Flood Warning	IND	Knox, Sullivan	4 days
Jul 23, 11:14 AM EDT	River Flood Warning	IND	Knox, Sullivan	4 days
Jul 23, 1:04 PM EDT	Special Weather Statement	IND	Tippecanoe	41 min
Jul 23, 2:36 PM EDT	Special Weather Statement	IND	Hendricks	24 min
Jul 23, 2:56 PM EDT	Severe Thunderstorm Warning	IND	Hendricks, Marion	34 min
Jul 23, 4:46 PM EDT	Tornado Warning	IND	Howard	29 min

Nearby

Special Weather Statements in Indiana, 2017 Every special weather statement in 2017

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.