Alert archive / Indiana / Special Weather Statements in 2012

Special Weather Statement, NWS Louisville, KY

April 30, 2012Crawford County, Indiana

NWS Louisville, KY issued this special weather statement at Apr 30, 2012, 5:22 PM EDT for Crawford County, Indiana. It was in force for 23 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: Apr 30, 2012, 5:22 PM EDT (21:22 UTC)
Expired: Apr 30, 2012, 5:45 PM EDT
In force: 23 min
Issued by: NWS Louisville, KY

County Crawford County, IN

The radar

The Louisville radar (KLVX), 51 km from the middle of the area, began a volume at 21:23 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

Nashville Metro, TN (KBNA), launched 12:00Z, 9.4 hours before the alert went out and 234 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: 452 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Louisville, KY wrote its last area forecast discussion before this special weather statement went out at Apr 30, 3:15 PM EDT, 2 hours 7 minutes earlier.

Area forecast discussion, Apr 30, 3:15 PM EDT, 2 hours 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
315 PM EDT MON APR 30 2012

.Short Term (Tonight through Tuesday Night)...
Issued at 315 PM EDT Mon Apr 30 2012

Wet period in store for the region as airmass that is 2-3 standard
deviations more moist than normal. This moisture is pooled south of
a stationary front that will stay north of the region. The period
will begin with a bang as we get a line of storms moving in from the
west late this afternoon and continuing into the evening. Warmer
temperatures at 700 mb, as per latest SPC mesoanalysis, that have
kept the region capped through the day so far are headed eastward.
Soundings indicate the chance for some organized cells with bowing
segments as 50-60 kt winds aloft get pushed down. Wet bulb zeroes
are low for now, but should go up as the evening goes along and more
moisture gets pumped into the area.

While the threat for severe weather should abate later this evening,
the moisture field will stay across the area. A brief lull should
follow the line coming through this evening, but a narrow 30-40 kt
low-level jet to return overnight and aid in forcing more storms.
Then on Tuesday expect one more wave aloft to move across the region
and provide another good shot at storms. Tuesday night the boundary
will lift farther away from the region and expect ridging aloft to
effectively end precip chances and bring a warmup, as per the
discussion below.

Temperatures this period will depend on convective timing. Have gone
with a quick drop in readings along the expected line of storms.
Then should see a slow drop to the mid 60s for lows tonight. Highs
tomorrow will depend greatly on any breaks in the cloud cover. For
now have highs in the upper 70s/around 80 for most of the area, save
for the southern counties where have lower 80s. Readings should fall
again only to the mid 60s Tuesday night.

.Long Term (Wednesday through Monday)...
Issued at 315 PM EDT Apr 30 2012

...Very warm temperatures more typical of late June are expected
Wednesday through at least Friday...

The upper air pattern beginning early Wednesday will feature a
pattern typical of early summer. The jet, after exiting a broad
trough centered over Idaho, will flow northeast across Lake
Superior. By Friday, the jet will still be located well north of the
Great Lakes, a location more typical of mid-summer than early May.

The Bermuda High, frequently located east of the Florida coast will
become displaced farther west, and is expected to be located over or
near Georgia. 500mb ridging associated with this high will extend
northwestward over the Lower Ohio Valley. Southwesterly flow near
the surface, coupled with broad subsidence, will allow plenty of sun
and 925mb temperatures to reach 24C. Although we are obviously
green, antecedent ground conditions are not wet. It will be quite
possible for high temperatures to approach 90 on Wednesday and
Thursday, and quite possibly Friday as well. Overnight lows will
stay quite mild as well, remaining well up in the mid 60s.

Guidance varies on both precipitation chances and temperatures
this weekend. For certain, Saturday and Sunday will stay warm, and
may even trend towards hot. The ECMWF continues to forecast ridging
and very warm temperatures over the Ohio Valley. The latest
operational GFS however, flattens the ridge across Indiana and Ohio
and attempts to bring a cold front southward towards the Ohio River
Saturday and Sunday. Should this occur, temperatures will trend just
a bit cooler across the north (highs closer to 80 compared to near
90 as forecast by the ECMWF). Precipitation chances this weekend
will depend on the evolution of this potential boundary. At the very
least, will continue at least a chance for afternoon and early
evening thunderstorms Saturday and Sunday.

Winds will stay reasonably light and consistent Wednesday through
Friday. Light south winds overnight will tend to freshen a bit each
afternoon and peak in the 10 to 15 mph range. Should the GFS verify,
winds will switch to the north Monday with expected high
temperatures falling into the upper 70s.

&&

.Aviation (18Z TAF Issuance)...
Updated at 125 PM EDT Mon Apr 30 2012

Warm frontal boundary continues to push slowly northward across the
Cold frontal boundary to the west will head eastward late this
afternoon and evening bringing a chance of showers and storms to the
terminals late this afternoon...and more likely this evening. Have
tried to time the best chance for stronger storms moving through the
terminals based on the rapid refresh and SPC WRF models. This
forecast probably will have to be fine tuned as these storms
organize. The rest of the forecast will keep in chances for storms
has a frontal boundary gets stalled over the region and as moisture
increases in the atmosphere to well above normal for this time of
year.

&&

.LMK WATCHES/WARNINGS/ADVISORIES...
IN...NONE.
KY...NONE.

Short Term.......RJS
Long Term........JSD
Aviation.........RJS

Hazardous weather outlook, Apr 30, 4:56 PM EDT, 26 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LOUISVILLE KY
456 PM EDT MON APR 30 2012

KYZ035>037-039>043-046>049-054>057-064>067-075>078-081-082-012100-
FRANKLIN KY-SCOTT KY-HARRISON KY-ANDERSON KY-WOODFORD KY-
FAYETTE KY-BOURBON KY-NICHOLAS KY-WASHINGTON KY-MERCER KY-
JESSAMINE KY-CLARK KY-MARION KY-BOYLE KY-GARRARD KY-MADISON KY-
GREEN KY-TAYLOR KY-CASEY KY-LINCOLN KY-MONROE KY-METCALFE KY-
ADAIR KY-RUSSELL KY-CUMBERLAND KY-CLINTON KY-
456 PM EDT MON APR 30 2012 /356 PM CDT MON APR 30 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL KENTUCKY.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

A COLD FRONT NORTH OF THE AREA WILL COMBINE WITH MOISTURE
INCREASING AND RELATIVELY WARM TEMPERATURES TO PRODUCE STRONG
THUNDERSTORMS THIS EVENING AND OVERNIGHT. THE STRONGEST STORMS
THIS EVENING WILL PRODUCE GUSTY WINDS...SMALL HAIL...HEAVY
RAINFALL...AND FREQUENT TO EXCESSIVE CLOUD TO GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

NUMEROUS STORMS WILL CONTINUE TO FORM IN A MOIST AIRMASS DURING
THE DAY TUESDAY. THE MAIN THREATS HERE WILL BE HEAVY RAINFALL AND
FREQUENT CLOUD TO GROUND LIGHTNING.

SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE POSSIBLE FRIDAY
AFTERNOON THROUGH SUNDAY AFTERNOON AS A SERIES OF IMPULSES MOVE
ALONG A POSSIBLE FRONTAL BOUNDARY ACROSS SOUTHERN INDIANA. GUSTY
WINDS...CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY RAIN WILL
ACCOMPANY ANY STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

INZ076>079-083-084-089>092-KYZ023>034-038-045-053-061>063-070>074-
012100-
ORANGE IN-WASHINGTON IN-SCOTT IN-JEFFERSON IN-DUBOIS IN-
CRAWFORD IN-PERRY IN-HARRISON IN-FLOYD IN-CLARK IN-HANCOCK KY-
BRECKINRIDGE KY-MEADE KY-OHIO KY-GRAYSON KY-HARDIN KY-BULLITT KY-
JEFFERSON KY-OLDHAM KY-TRIMBLE KY-HENRY KY-SHELBY KY-SPENCER KY-
NELSON KY-LARUE KY-BUTLER KY-EDMONSON KY-HART KY-LOGAN KY-
WARREN KY-SIMPSON KY-ALLEN KY-BARREN KY-
456 PM EDT MON APR 30 2012 /356 PM CDT MON APR 30 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
INDIANA AND CENTRAL KENTUCKY.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

A COLD FRONT NORTH OF THE AREA WILL COMBINE WITH MOISTURE
INCREASING AND RELATIVELY WARM TEMPERATURES TO PRODUCE STRONG TO
SEVERE THUNDERSTORMS LATE THIS AFTERNOON AND INTO THE EVENING. THE
STRONGEST STORMS WILL PRODUCE DAMAGING WINDS...HAIL...HEAVY
RAINFALL...AND FREQUENT TO EXCESSIVE CLOUD TO GROUND LIGHTNING.
ADDITIONAL SHOWERS AND STORMS ARE EXPECTED TO RE DEVELOP LATE IN
THE EVENING AND OVERNIGHT...BUT THESE STORMS ARE NOT EXPECTED TO
BE SEVERE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

NUMEROUS STORMS WILL CONTINUE TO FORM IN A MOIST AIRMASS DURING
THE DAY TUESDAY. THE MAIN THREATS HERE WILL BE HEAVY RAINFALL AND
FREQUENT CLOUD TO GROUND LIGHTNING.

SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE POSSIBLE FRIDAY
AFTERNOON THROUGH SUNDAY AFTERNOON AS A SERIES OF IMPULSES MOVE
ALONG A POSSIBLE FRONTAL BOUNDARY ACROSS SOUTHERN INDIANA. GUSTY
WINDS...CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY RAIN WILL
ACCOMPANY ANY STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD REPORT ANY STRONGER WIND GUSTS AS WELL AS HAIL TO
THE NATIONAL WEATHER SERVICE THIS AFTERNOON AND TONIGHT.

RJS/JSD

In the hours before

Special weather statement, Apr 30, 4:28 PM EDT, 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOUISVILLE KY
428 PM EDT MON APR 30 2012

KYZ073-074-076-302115-
ALLEN-BARREN-METCALF-
328 PM CDT MON APR 30 2012

...STRONG THUNDERSTORM WITH HALF INCH HAIL...AND 40 MPH WINDS WILL
QUICKLY MOVE NORTHEAST ACROSS NORTHERN ALLEN AND BARREN COUNTIES...

AT 322 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR SCOTTSVILLE...AND MOVING NORTHEAST AT 35
MPH.

HALF INCH HAIL...AND GUSTY WINDS OF AROUND 45 MPH...ARE EXPECTED
WITH THIS STORM.

* THIS STORM WILL ALSO IMPACT...
  SCOTTSVILLE...
  GLASGOW...
  AUSTIN AND PORT OLIVER FORD...
  LUCAS AND FINNEY...
  COOKTOWN AND RED CROSS...
  HAYWOOD AND BRISTLETOWN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER INDOORS AND STAY
AWAY FROM WINDOWS. STAY TUNED TO NOAA ALL HAZARDS RADIO...
WEATHER.GOV/LOUISVILLE ON THE INTERNET...OR LOCAL MEDIA FOR LATER
UPDATES AND POSSIBLE WARNINGS.

&&

LAT...LON 3683 8628 3693 8620 3692 8619 3694 8617
      3699 8614 3706 8607 3716 8600 3714 8589
      3689 8563 3684 8574 3684 8577 3680 8584
      3671 8597 3665 8609
TIME...MOT...LOC 2027Z 228DEG 30KT 3681 8614

JSD

Special weather statement, Apr 30, 5:12 PM EDT, 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOUISVILLE KY
512 PM EDT MON APR 30 2012

KYZ064-074>077-081-302200-
ADAIR-BARREN-CUMBERLAND-GREEN-METCALF-MONROE-
412 PM CDT MON APR 30 2012

...A STRONG THUNDERSTORM WITH DANGEROUS LIGHTNING...HEAVY
RAIN...PENNY SIZE HAIL...AND 45 MPH WINDS WILL MOVE ACROSS SOUTHERN
METCALFE AND INTO ADAIR COUNTY...

AT 409 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 9 MILES SOUTHWEST OF EDMONTON...AND MOVING
NORTHEAST AT 40 MPH.

FREQUENT CLOUD TO GROUND LIGHTNING...HEAVY RAIN WITH RAINFALL RATES
OF AROUND ONE INCH PER HOUR REDUCING VISIBILITIES TO LESS THAN ONE
MILE...PENNY SIZE HAIL...AND GUSTY WINDS OF AROUND 35 TO 40 MPH...ARE
EXPECTED WITH THIS STORM.

* THIS STORM WILL ALSO IMPACT...
  EDMONTON...
  COLUMBIA...
  CURTIS AND CEDAR FLATS...
  GASCON...
  COFER AND NELL...
  BREEDING AND TORIA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER INDOORS AND STAY
AWAY FROM WINDOWS. STAY TUNED TO NOAA ALL HAZARDS RADIO...
WEATHER.GOV/LOUISVILLE ON THE INTERNET...OR LOCAL MEDIA FOR LATER
UPDATES AND POSSIBLE WARNINGS.

&&

LAT...LON 3695 8582 3726 8540 3724 8539 3723 8541
      3722 8541 3722 8537 3719 8535 3722 8531
      3701 8519 3696 8522 3677 8574
TIME...MOT...LOC 2111Z 251DEG 34KT 3689 8570

JSD

Special weather statement, Apr 30, 5:18 PM EDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOUISVILLE KY
518 PM EDT MON APR 30 2012

INZ089-KYZ023>025-302145-
BRECKINRIDGE-HANCOCK-MEADE-PERRY-
418 PM CDT MON APR 30 2012

...STRONG THUNDERSTORM WITH DANGEROUS LIGHTNING...HEAVY RAIN...PENNY
SIZE HAIL...AND 40 MPH WINDS...

AT 413 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES NORTH OF WHITESVILLE...AND MOVING
NORTHEAST AT 60 MPH.

FREQUENT CLOUD TO GROUND LIGHTNING...HEAVY RAIN WITH RAINFALL RATES
OF AROUND ONE INCH PER HOUR REDUCING VISIBILITIES TO LESS THAN ONE
MILE...PENNY SIZE HAIL...AND GUSTY WINDS OF AROUND 35 TO 40 MPH...ARE
EXPECTED WITH THIS STORM.

* THIS STORM WILL ALSO IMPACT...
  HAWESVILLE...
  TELL CITY...
  SKILLMAN AND DODD...
  HARDINGROVE AND HOLT...
  MANNING CROSSING AND AMMONS...
  RHODELIA AND MOOLEYVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER INDOORS AND STAY
AWAY FROM WINDOWS. STAY TUNED TO NOAA ALL HAZARDS RADIO...
WEATHER.GOV/LOUISVILLE ON THE INTERNET...OR LOCAL MEDIA FOR LATER
UPDATES AND POSSIBLE WARNINGS.

&&

LAT...LON 3799 8686 3800 8684 3806 8644 3794 8623
      3772 8678 3774 8683 3780 8683 3783 8686
      3783 8690 3784 8692 3788 8690 3790 8692
TIME...MOT...LOC 2118Z 236DEG 54KT 3783 8678

EER

Special weather statement, Apr 30, 5:22 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOUISVILLE KY
522 PM EDT MON APR 30 2012

INZ076-084-302145-
CRAWFORD-ORANGE-
522 PM EDT MON APR 30 2012

...STRONG THUNDERSTORMS WITH DANGEROUS LIGHTNING...HEAVY RAIN...PENNY
SIZE HAIL...AND 50 MPH WINDS...

AT 418 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 14 MILES WEST OF
ENGLISH TO 14 MILES SOUTHWEST OF ENGLISH TO 11 MILES NORTHEAST OF
TELL CITY...AND MOVING NORTHEAST AT 45 MPH. THIS STORM HAS A SEVERE
THUNDERSTORM WARNING ON IT FOR NORTHERN PERRY COUNTY.

CONTINUOUS CLOUD TO GROUND LIGHTNING...HEAVY RAIN WITH RAINFALL RATES
OF AROUND ONE INCH PER HOUR REDUCING VISIBILITIES TO LESS THAN ONE
MILE...PENNY SIZE HAIL...AND STRONG GUSTY WINDS OF AROUND 50 MPH OR
SO ARE EXPECTED WITH THESE STORMS.

* THESE STORMS WILL ALSO IMPACT...
  ENGLISH...
  TASWELL AND SULPHUR...
  BROWNSTOWN AND FARGO...
  BACON AND MARENGO...

THESE STORMS WILL AFFECT INTERSTATE 64 IN INDIANA BETWEEN MILE
MARKERS 86 AND 92.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...SEEK SHELTER INDOORS AND
STAY AWAY FROM WINDOWS. STAY TUNED TO NOAA ALL HAZARDS RADIO...
WEATHER.GOV/LOUISVILLE ON THE INTERNET...OR LOCAL MEDIA FOR LATER
UPDATES AND POSSIBLE WARNINGS.

&&

LAT...LON 3848 8645 3830 8626 3822 8628 3818 8631
      3820 8635 3819 8638 3817 8638 3816 8633
      3814 8632 3813 8638 3811 8640 3813 8646
      3821 8646 3821 8657 3827 8657 3826 8668
      3836 8668
TIME...MOT...LOC 2121Z 247DEG 43KT 3829 8667 3818 8656
          3806 8656

AL

The office that day

Everything else NWS Louisville, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 4:28 PM EDT	Special Weather Statement	LMK	Allen, Barren	47 min
Apr 30, 5:12 PM EDT	Special Weather Statement	LMK	Adair, Metcalfe	48 min
Apr 30, 5:18 PM EDT	Special Weather Statement	LMK	Hancock	27 min
Apr 30, 5:41 PM EDT	Special Weather Statement	LMK	Meade	34 min
Apr 30, 5:44 PM EDT	Special Weather Statement	LMK	Logan	46 min
Apr 30, 5:52 PM EDT	Severe Thunderstorm Warning	LMK	Breckinridge, Meade	23 min
Apr 30, 6:16 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Logan, Simpson, Warren	29 min
Apr 30, 6:19 PM EDT	Special Weather Statement	LMK	Bullitt, Hardin, Jefferson	26 min
Apr 30, 6:44 PM EDT	Special Weather Statement	LMK	Warren	46 min
Apr 30, 6:50 PM EDT	Special Weather Statement	LMK	Bullitt, Henry, Jefferson, Nelson, Oldham, Shelby and 1 more	25 min
Apr 30, 7:05 PM EDT	Severe Thunderstorm Warning	LMK	Allen, Barren, Edmonson, Hart, Warren	25 min
Apr 30, 7:16 PM EDT	Special Weather Statement	LMK	Henry, Shelby	29 min
Apr 30, 7:30 PM EDT	Special Weather Statement	LMK	Hart	30 min
Apr 30, 7:45 PM EDT	Special Weather Statement	LMK	Shelby	30 min
Apr 30, 4:59 PM EDT	Severe Thunderstorm Warning	LMK	Perry	46 min
Apr 30, 6:33 PM EDT	Special Weather Statement	LMK	Dubois	27 min
Apr 30, 6:52 PM EDT	Special Weather Statement	LMK	Crawford, Orange	23 min
Apr 30, 7:24 PM EDT	Special Weather Statement	LMK	Clark	36 min

Nearby

Special Weather Statements in Indiana, 2012 Every special weather statement in 2012

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.