Alert archive / Indiana / Special Weather Statements in 2011

Special Weather Statement, NWS Indianapolis, IN

July 20, 2011Shelby County, Indiana

NWS Indianapolis, IN issued this special weather statement at Jul 20, 2011, 4:36 PM EDT for Shelby County, Indiana. It was in force for 39 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 20, 2011, 4:36 PM EDT (20:36 UTC)
Expired: Jul 20, 2011, 5:15 PM EDT
In force: 39 min
Issued by: NWS Indianapolis, IN

County Shelby County, IN

The radar

The Indianapolis radar (KIND), 34 km from the middle of the area, began a volume at 20:37 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 8.6 hours before the alert went out and 181 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: 2184 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

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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 20, 4:20 PM EDT, 16 minutes earlier.

Area forecast discussion, Jul 20, 4:20 PM EDT, 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
420 PM EDT WED JUL 20 2011

.UPDATE...

THE AVIATION SECTION HAS BEEN UPDATED BELOW.

&&

.SYNOPSIS...

DANGEROUSLY OPPRESSIVE HEAT AND HUMIDITY CONTINUES INTO THE
WEEKEND AS RIDGING ALOFT REMAINS IN PLACE. A WEAK BOUNDARY MAY
APPROACH THE AREA ON FRIDAY BEFORE WASHING OUT. ANOTHER WEAK
BOUNDARY AND SURFACE HIGH MAY ENTER THE AREA EARLY NEXT
WEEK...ALLOWING A SLIGHT COOL DOWN...BUT WITH TEMPERATURES STILL
REMAINING ABOVE NORMAL.

&&

.NEAR TERM /TONIGHT/...

FOCUS IS TEMPERATURES. GUIDANCE IS SIMILAR ON MAJOR FEATURES AND A
BLEND IS SUFFICIENT.

CONSIDERED A SLIGHT CHANCE POP FOR THE FIRST HOUR OR TWO OF THE
OVERNIGHT PERIOD TO ACCOUNT FOR ANY POP UPS THAT MANAGE TO HOLD ON
PAST 00Z...BUT FEEL THAT THIS IS UNLIKELY ENOUGH TO MERIT NO
MENTION. AMPLE INSTABILITY IS PRESENT...BUT WITH LITTLE TO NO
SHEAR AND FORCING/TRIGGERS...EXPECT VAST MAJORITY OF STORMS TO
HAVE DISSIPATED BY 00Z.

ON TEMPS...GUIDANCE PERFORMING POORLY ON OVERNIGHTS...ESPECIALLY
NEAR CITIES IN THE AREA...AND WITH NO AIRMASS CHANGE WILL GO WITH
TEMPS AT OR SLIGHTLY ABOVE PERSISTENCE.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...

FOCUS REMAINS TEMPS. GUIDANCE IS SIMILAR AND A BLEND IS SUFFICIENT.

LITTLE CHANGE IN AIRMASS ANTICIPATED THROUGH THE END OF THE WORK
WEEK...AND THUS HEAT AND HUMIDITY WILL CONTINUE. GUIDANCE
STRUGGLES WITH THIS...AND TEMPS AT OR ABOVE PERSISTENCE WILL BE
USED TOMORROW...WITH A SLIGHT REDUCTION ON FRIDAY FOR ADDITIONAL
THUNDERSTORM POTENTIAL.

AMPLE INSTABILITY NECESSITATES A SLIGHT CHANCE POP TOMORROW
AFTERNOON...BUT CANNOT JUSTIFY HIGHER IN ABSENCE OF SIGNIFICANT
FORCING. A WEAK BOUNDARY MAY APPROACH THE AREA...BUT WILL LIKELY
STALL WELL TO THE NORTH ON THURSDAY. THIS BOUNDARY MAY GET A
LITTLE CLOSER ON FRIDAY...AND GUIDANCE HINTS AT WEAK WAVES THAT
MAY SLIDE ALONG THE BOUNDARY IN THE PRESENCE OF A SLIGHTLY
WEAKENING CAP. THUS...WILL CONTINUE SLIGHT CHANCE TO LOW CHANCE
POPS ON FRIDAY.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...

LITTLE RELIEF IN SIGHT AS FLAT...BROAD RIDGING REMAINS THE RULE
ACROSS THE REGION. WEAK BOUNDARY AND SURFACE HIGH EARLY NEXT WEEK
WILL LIKELY BRING SOME RELIEF FROM HUMIDITY...AND MINOR
TEMPERATURE RELIEF...WITH HIGHS DROPPING BACK INTO THE UPPER
80S/LOW 90S. WENT SLIGHTLY ABOVE HPC NUMBERS SOME PERIODS.

ON POPS...MAY SEE SOME THUNDERSTORMS WITH A WEAK FRONTAL SYSTEM
OVER THE WEEKEND INTO EARLY NEXT WEEK...BEFORE DRY WEATHER RETURNS
WITH SURFACE HIGH MONDAY NIGHT INTO TUESDAY. HPC NUMBERS WERE A
BIT SPORADIC AND GENERALLY WENT NEAR ENSEMBLE NUMBERS.

MAY END UP NEEDING TO EXTEND HEAT WARNING INTO SUNDAY...BUT WITH
AMPLE TIME TO MAKE THIS DECISION...WILL DEFER FOR NOW. A LOT CAN
CHANGE BETWEEN NOW AND DAY 5.

&&

.AVIATION.../FOR 202100Z TAF UPDATES/...

WILL KEEP CB GROUPS IN THROUGH 00Z AS THERE WERE A COUPLE OF
ISOLATED STORMS OUT THERE...AND TEMPERATURES WERE IN THE UPPER 90S
WHICH HAS ALLOWED THE CAP TO BREAK. IN ADDTION...WINDS HAVE TURNED
SOUTHEAST AT BMG AS AN OUTFLOW BOUNDARY HAS MOVED THROUGH THERE FROM
A BIG STORM JUST TO THE SOUTH. FINALLY...BUMPED UP WINDS BASED ON
OBSERVATIONS THROUGH 00Z. PREVIOUS DISCUSSION FOLLOWS...

SURFACE HIGH PRESSURE FROM SOUTHEAST STATES TO FORECAST AREA
THROUGH THE PERIOD. HIGH PRESSURE ALOFT REMAINING OVER AREA.

PERSISTENT SCT TO BKN CIRRUS AT 25 THOUSAND FEET. SCT-BKN TOWERING
CUMULUS WITH BASES 5 THOUSAND FEET THIS AFTERNOON.

VISIBILITIES P6SM...EXCEPT AREAS MVFR IN HAZE 09Z-13Z THURSDAY.

WINDS MAINLY SOUTHWEST LESS THAN 10 KNOTS.

&&

.IND WATCHES/WARNINGS/ADVISORIES...

EXCESSIVE HEAT WARNING UNTIL 8 PM EDT SATURDAY FOR INZ021-
028>031-035>049-051>057-060>065-067>072.

&&

SYNOPSIS...NIELD
NEAR TERM...NIELD
SHORT TERM...NIELD
LONG TERM....NIELD
AVIATION...JK/MK

Hazardous weather outlook, Jul 20, 5:42 AM EDT, 10 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
542 AM EDT WED JUL 20 2011

INZ021-028>031-035>049-051>057-060>065-067>072-211000-
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-
542 AM EDT WED JUL 20 2011

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 8 PM EDT SATURDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA.

.DAY ONE...TODAY AND TONIGHT.

HEAT INDICES IN THE 105 TO 115 DEGREE RANGE ARE EXPECTED THIS
AFTERNOON AND EARLY EVENING.

SCATTERED THUNDERSTORM ACTIVITY IS POSSIBLE THROUGH THIS EVENING.
SEVERE STORMS ARE NOT EXPECTED...ALTHOUGH SOME STORMS MAY PRODUCE
LOCALLY HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

HEAT INDICES ARE EXPECTED TO RANGE BETWEEN 100 AND 115 DEGREES
DURING THE AFTERNOONS AND EARLY EVENINGS THROUGH SATURDAY.

THUNDERSTORM ACTIVITY IS POSSIBLE LATE THE WEEK...AROUND
FRIDAY...AS WELL AS EARLY NEXT WEEK...AROUND SUNDAY INTO NEXT
MONDAY. SEVERE STORMS ARE NOT EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

&&

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

JAS

In the hours before

Special weather statement, Jul 20, 3:57 PM EDT, 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
357 PM EDT WED JUL 20 2011

INZ070-202045-
LAWRENCE-
357 PM EDT WED JUL 20 2011

...STRONG THUNDERSTORM ADVISORY FOR LAWRENCE COUNTY UNTIL 445 PM
EDT...

AT 355 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES NORTHEAST OF BEDFORD...MOVING SOUTHWEST
AT 10 MPH.

WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  BEDFORD...
  HELTONVILLE...
  AVOCA...
  SPRINGVILLE...
  OOLITIC...
  TUNNELTON...
  SPRING MILL STATE PARK...
  MITCHELL...
  WILLIAMS...
  SILVERVILLE...
  HURON...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 3891 8668 3899 8651 3899 8628 3889 8628
      3869 8632 3870 8668
TIME...MOT...LOC 1957Z 023DEG 7KT 3894 8639

CP

Special weather statement, Jul 20, 4:36 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
436 PM EDT WED JUL 20 2011

INZ047-055-056-202115-
JOHNSON-MARION-SHELBY-
436 PM EDT WED JUL 20 2011

...STRONG THUNDERSTORM ADVISORY FOR NORTHEASTERN JOHNSON...
SOUTHEASTERN MARION AND NORTHWESTERN SHELBY COUNTIES UNTIL 515 PM
EDT...

AT 432 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES SOUTHEAST OF BEECH GROVE...OR 13 MILES
NORTHWEST OF SHELBYVILLE...MOVING SOUTHEAST AT 10 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

THIS STORM WILL BE NEAR...
BOGGSTOWN AROUND 505 PM EDT...
FAIRLAND AROUND 510 PM EDT...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 3946 8586 3963 8607 3974 8596 3974 8595
      3970 8595 3970 8584 3965 8570
TIME...MOT...LOC 2036Z 301DEG 7KT 3964 8595

CP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 8:08 PM EDT	Special Weather Statement	IND	Lawrence	52 min
Jul 19, 10:42 PM EDT	Special Weather Statement	IND	Jennings	48 min
Jul 20, 2:56 PM EDT	Areal Flood Advisory	IND	Brown	3 hr
Jul 20, 3:18 PM EDT	Areal Flood Advisory	IND	Jackson, Lawrence, Monroe	2 hr
Jul 20, 3:57 PM EDT	Special Weather Statement	IND	Lawrence	48 min
Jul 20, 4:31 PM EDT	Areal Flood Advisory	IND	Lawrence	3 hr
Jul 20, 4:58 PM EDT	Special Weather Statement	IND	Lawrence, Martin	47 min
Jul 20, 5:28 PM EDT	Special Weather Statement	IND	Rush	47 min
Jul 20, 5:45 PM EDT	Areal Flood Advisory	IND	Johnson, Marion, Shelby	3 hr
Jul 20, 5:51 PM EDT	Special Weather Statement	IND	Rush	39 min
Jul 20, 6:11 PM EDT	Severe Thunderstorm Warning	IND	Henry, Rush	49 min

Nearby

Special Weather Statements in Indiana, 2011 Every special weather statement in 2011

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.