Alert archive / Indiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 194, NWS Indianapolis, IN

July 20, 2008Jackson County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Jul 20, 2008, 7:15 PM EDT for Jackson County, Indiana. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 20, 2008, 7:15 PM EDT (23:15 UTC)
Expired: Jul 20, 2008, 7:45 PM EDT
In force: 30 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon

County Jackson County, IN

The radar

The Louisville radar (KLVX), 97 km from the middle of the area, began a volume at 23:17 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.

What was reported inside it

Time	Report	Where	Remark
Jul 20, 7:32 PM EDT	TSTM WND DMG	Brownstown, IN	TREES AND TREE LIMBS DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 17 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 20, 3:10 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.3 hours before the alert went out and 205 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: 525 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1168 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KIND 202315
SVRIND
INC071-202345-
/O.NEW.KIND.SV.W.0194.080720T2315Z-080720T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
715 PM EDT SUN JUL 20 2008

THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JACKSON COUNTY IN SOUTH CENTRAL INDIANA...
  THIS INCLUDES THE CITY OF SEYMOUR...

* UNTIL 745 PM EDT

* AT 710 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  BROWNSTOWN...OR 12 MILES WEST OF SEYMOUR...AND MOVING SOUTHEAST AT
  32 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BROWNSTOWN BY 720 PM EDT...
  SEYMOUR BY 725 PM EDT...
  CROTHERSVILLE BY 745 PM EDT...

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 37 AND 54.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 3877 8607 3878 8609 3878 8611 3880 8627
      3895 8629 3904 8612 3901 8581 3879 8582
      3874 8590
TIME...MOT...LOC 2315Z 302DEG 28KT 3891 8607

$$

BROOKS

2 follow-up statements

000 
WWUS53 KIND 202330
SVSIND

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
730 PM EDT SUN JUL 20 2008

INC071-202345-
/O.CON.KIND.SV.W.0194.000000T0000Z-080720T2345Z/
JACKSON-
730 PM EDT SUN JUL 20 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR JACKSON COUNTY...

AT 724 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR BROWNSTOWN...OR 8 MILES SOUTHWEST OF SEYMOUR...MOVING
SOUTHEAST AT 32 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CROTHERSVILLE BY 740 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 3877 8607 3878 8609 3880 8627 3895 8629
      3902 8615 3897 8581 3879 8582 3874 8590
TIME...MOT...LOC 2330Z 302DEG 28KT 3885 8594

$$

BROOKS

000 
WWUS53 KIND 202346
SVSIND

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
746 PM EDT SUN JUL 20 2008

INC071-202357-
/O.EXP.KIND.SV.W.0194.000000T0000Z-080720T2345Z/
JACKSON-
747 PM EDT SUN JUL 20 2008

...THE SEVERE THUNDERSTORM WARNING FOR JACKSON COUNTY HAS EXPIRED...

LAT...LON 3877 8607 3878 8609 3880 8627 3895 8629
      3902 8615 3897 8581 3879 8582 3874 8590
TIME...MOT...LOC 2330Z 302DEG 28KT 3885 8594

$$

BROOKS

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 20, 7:15 PM EDT, 0 minutes earlier.

Area forecast discussion, Jul 20, 7:15 PM EDT, 0 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
715 PM EDT SUN JUL 20 2008

AVIATION...DISCUSSION FOR 00Z TAFS

THUNDERSTORMS CONTINUE TO MOVE SEWD AWAY FROM TAF SITES AND LOOKING
UPSTREAM...IT LOOKS LIKE CLOUDS WILL BE CLEARING WITHIN THE NEXT FEW
HOURS.

IT LOOKS LIKE A CHANCE OF SHOWERS AND THUNDERSTORMS ARE POSSIBLE
AGAIN LATER TONIGHT BUT AGAIN BY MONDAY AFTERNOON. THERE IS A WEAK
FRONTAL BOUNDARY THROUGH CENTRAL IN...AND SATELLITE IMAGERY SHOWS A
SHORTWAVE OVER IA. THIS COMBINATION WILL LEAD TO THE TREAT OF RAIN
AND STORMS DURING THE PERIOD.

&&

.PREV DISCUSSION...

FORECAST FOCUS IS ON CHANCES FOR RAIN THROUGH MID WEEK.

AT 18Z A SFC BOUNDARY EXTENDED ACRS NRN SECTIONS OF CENTRAL IN INTO
IL. SCT TSRA WERE FIRING ALONG THIS BOUNDARY AS WELL AS POPPING UP
ACRS REMAINDER OF FORECAST AREA /FA/ DUE TO UNSTABLE AMS. TSRA WERE
ALSO TRYING TO GET GOING IN WRN IA.

MODELS ARE IN DECENT AGREEMENT. NO ONE MODEL IS DOING GREAT WITH
CONVECTION BUT THE MODELS MAIN MASS FIELDS ARE SIMILAR. WILL USE A
BLEND...BUT CONFIDENCE IS LOW DUE TO UNCERTAINTY OF MCS DEVELOPMENT
WHICH OFTEN ARE NOT HANDLED WELL BY MODELS.

EXPECT SCT TSRA TO CONTINUE INTO THIS EVENING WITH BOUNDARY IN THE
AREA AND CONTINUED UNSTABLE ATMS. WILL CONTINUE CHC POPS THIS
EVENING. MEANWHILE...STRONG WARM ADVECTION BEGINS ALOFT ACROSS NE/IA
WHICH SHOULD FIRE ANOTHER MCS. THIS MCS WILL TRACK TOWARD THE FA
OVERNIGHT. SOME QUESTION AS TO WHETHER IT WILL MAKE IT TO THE FA BY
12Z. THUS AM NOT CONFIDENT ENOUGH FOR LIKELY POPS OVERNIGHT. WENT
HIGH CHANCE POPS NW FA OVERNIGHT /CLOSEST TO POTENTIAL MCS TRACK/
WITH LOWEST POPS SE FA /FARTHEST AWAY FROM POTENTIAL MCS TRACK/.
THESE ARE STILL HIGHER THAN MOS WHICH ATTM DOES NOT LOOK LIKE IT
HANDLES THE SITUATION WELL. WITH CLOUDS AROUND AND A CONTINUED HUMID
AIRMASS...FEEL THAT MAV TEMPS ARE TOO COOL. BLENDED MAV WITH THE
WARMER MET VALUES.

ON MON REMNANTS OF MCS MAY BE MOVING ACROSS FA DURING THE
MORNING...WITH MORE SCT STORMS FIRING IN THE AFTN ALONG REMNANT
BOUNDARIES. WITH TIMING AND COVERAGE UNCERTAIN...KEPT CHANCE POPS
ALL DAY. MAV TEMPS LOOK TOO WARM GIVEN CLOUDS AND TSRA AROUND. WENT
CLOSER TO MET NUMBERS.

UPPER TROF WILL DIG SW INTO THE AREA MON NIGHT INTO TUE AND BRING
COOLER AND DRIER AIR INTO THE AREA BY WED. TSRA THREAT WILL CONTINUE
MON NIGHT AND TUE ACROSS ENTIRE FA AS ANOTHER MCS MAY RIDE ACROSS
SRN FA. BELIEVE ENUF DRIER AIR WILL WORK INTO NRN FA TO END RAIN
THREAT THERE BY TUE AFTN. ENDED RAIN REMAINDER OF FA BY TUE NIGHT.
GFS IS A BIT STRONGER WITH UPPER LOW AND KEEPS RAIN THREAT INTO
WED...BUT IT IS AN OUTLIER ATTM SO WILL CONTINUE DRY FORECAST WED.

NEXT WAVE WILL IMPACT FA THU NIGHT INTO FRI SO CONTINUED LOW CHC
POPS THEN. REMOVED POPS ON THU AS TIMING NOW APPEARS TO BE THU NIGHT.

&&

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

&&

AVIATION...DWM
PUBLIC...CS

Hazardous weather outlook, Jul 20, 3:23 PM EDT, 3 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
323 PM EDT SUN JUL 20 2008

INZ021-028>031-035>049-051>057-060>065-067>072-211930-
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-
323 PM EDT SUN JUL 20 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED THUNDERSTORMS WILL CONTINUE THROUGH TONIGHT. SEVERE
STORMS ARE POSSIBLE...WITH DAMAGING WINDS THE PRIMARY THREAT.
HEAVY RAIN IS ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

THE RISK FOR SEVERE THUNDERSTORMS WILL CONTINUE THROUGH MONDAY AS
A COLD FRONT SLOWLY MOVES SOUTH ACROSS THE AREA. THE MAIN HAZARD
MONDAY ALSO APPEARS TO BE DAMAGING WINDS. DO NOT FORGET THAT CLOUD
TO GROUND LIGHTNING IS ALWAYS A THREAT WITH ANY STORM.

STORMS ARE ALSO POSSIBLE TUESDAY AND AGAIN NEXT THURSDAY NIGHT AND
FRIDAY. SEVERE STORMS ARE NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED INTO THIS EVENING AND MAY BE
NEEDED AGAIN LATER MONDAY.

&&

MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND
CLIMATE INFORMATION CAN BE FOUND...AT HTTP://WEATHER.GOV/IND (ALL
LOWERCASE)

In the hours before

Local storm report, Jul 20, 6:02 PM EDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
602 PM EDT SUN JUL 20 2008

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

0540 PM     TSTM WND DMG     6 SSW MARTINSVILLE      39.34N 86.46W
07/20/2008                   MORGAN             IN   PUBLIC

            MULTIPLE TREES AND BRANCHES DOWN AND CURRENTLY COMING
            DOWN

0545 PM     TSTM WND DMG     BARGERSVILLE            39.52N 86.17W
07/20/2008                   JOHNSON            IN   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN THROUGHOUT THE COUNTY

&&

HEROLD

Local storm report, Jul 20, 6:17 PM EDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
617 PM EDT SUN JUL 20 2008

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

0540 PM     TSTM WND DMG     PARAGON                 39.39N 86.56W
07/20/2008                   MORGAN             IN   AMATEUR RADIO

            TWELVE INCH TREE DOWN ON HOUSE...POWER OUT

0542 PM     TSTM WND DMG     GREENWOOD               39.62N 86.11W
07/20/2008                   JOHNSON            IN   AMATEUR RADIO

            TEN INCH DIAMETER TREE SNAPPED OFF ON SOUTHEAST SIDE OF
            CITY.

0602 PM     TSTM WND DMG     EDINBURGH               39.35N 85.97W
07/20/2008                   JOHNSON            IN   TRAINED SPOTTER

            POWER LINES AND TREES DOWN.

0602 PM     TSTM WND GST     EDINBURGH               39.35N 85.97W
07/20/2008  E65 MPH          JOHNSON            IN   TRAINED SPOTTER

0602 PM     TSTM WND DMG     FRANKLIN                39.49N 86.06W
07/20/2008                   JOHNSON            IN   TRAINED SPOTTER

            LARGE TREE DOWN OVER GRAHAM ROAD

&&

HEROLD

Local storm report, Jul 20, 6:34 PM EDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
634 PM EDT SUN JUL 20 2008

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

0601 PM     HEAVY RAIN       10 NE BLOOMINGTON       39.27N 86.39W
07/20/2008  M3.39 INCH       BROWN              IN   AMATEUR RADIO

            THIS IS A PER HOUR RATE ON ANDERSON ROAD

0630 PM     TSTM WND DMG     WESTPORT                39.18N 85.58W
07/20/2008                   DECATUR            IN   LAW ENFORCEMENT

            POWER LINES...TREES AND TREE LIMBS DOWN

&&

HEROLD

Local storm report, Jul 20, 6:38 PM EDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
638 PM EDT SUN JUL 20 2008

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

0545 PM     TSTM WND DMG     FRANKLIN                39.49N 86.06W
07/20/2008                   JOHNSON            IN   TRAINED SPOTTER

            POWER LINES...TREES...AND TREE LIMBS DOWN. TREE BLOCKING
            ROAD NEAR BANA AND BRECKENRIDGE.

&&

HEROLD

Local storm report, Jul 20, 6:47 PM EDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
647 PM EDT SUN JUL 20 2008

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

0615 PM     TSTM WND DMG     COLUMBUS                39.21N 85.91W
07/20/2008                   BARTHOLOMEW        IN   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN THROUGHOUT THE CITY

&&

HEROLD

Local storm report, Jul 20, 7:07 PM EDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
707 PM EDT SUN JUL 20 2008

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

0635 PM     TSTM WND DMG     NORTH VERNON            39.01N 85.63W
07/20/2008                   JENNINGS           IN   LAW ENFORCEMENT

            TREES DOWN COUNTYWIDE...TREES DOWN ON HWY 3 NORTH OF
            NORTH VERNON AND HWY 50 EAST OF NORTH VERNON

&&

HEROLD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 4:15 PM EDT	Severe Thunderstorm Warning	IND	Fountain, Parke, Vermillion	45 min
Jul 20, 4:51 PM EDT	Severe Thunderstorm Warning	IND	Clay, Parke, Putnam	24 min
Jul 20, 4:53 PM EDT	Severe Thunderstorm Warning	IND	Hendricks, Putnam	52 min
Jul 20, 5:14 PM EDT	Severe Thunderstorm Warning	IND	Hendricks, Morgan, Owen, Putnam	31 min
Jul 20, 5:28 PM EDT	Severe Thunderstorm Warning	IND	Johnson, Marion, Morgan	47 min
Jul 20, 5:38 PM EDT	Areal Flood Advisory	IND	Decatur, Hancock, Hendricks, Johnson, Marion, Morgan and 3 more	3 hr
Jul 20, 5:52 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Brown, Johnson, Shelby	38 min
Jul 20, 6:11 PM EDT	Severe Thunderstorm Warning	IND	Decatur, Rush	49 min
Jul 20, 6:20 PM EDT	Severe Thunderstorm Warning	IND	Monroe	25 min
Jul 20, 6:29 PM EDT	Severe Thunderstorm Warning	IND	Jackson, Jennings	46 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2008 Every severe thunderstorm warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.