Alert archive / Indiana / Special Weather Statements in 2018

Special Weather Statement, NWS Northern Indiana

August 9, 2018Saint Joseph County, Indiana

NWS Northern Indiana issued this special weather statement at Aug 9, 2018, 6:55 PM EDT for Saint Joseph County, Indiana. It was in force for 35 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: Aug 9, 2018, 6:55 PM EDT (22:55 UTC)
Expired: Aug 9, 2018, 7:30 PM EDT
In force: 35 min
Issued by: NWS Northern Indiana

County Saint Joseph County, IN

The radar

The Northern Indiana radar (KIWX), 48 km from the middle of the area, began a volume at 22:57 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

Detroit, MI (KDTX), launched 12:00Z, 10.9 hours before the alert went out and 248 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: 4 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Northern Indiana wrote its last area forecast discussion before this special weather statement went out at Aug 9, 3:43 PM EDT, 3 hours 12 minutes earlier.

Area forecast discussion, Aug 9, 3:43 PM EDT, 3 hours 12 minutes before

Area Forecast Discussion
National Weather Service Northern Indiana
343 PM EDT Thu Aug 9 2018

.SYNOPSIS...
Issued at 339 PM EDT Thu Aug 9 2018

Thunderstorms can dot the area this evening, gradually weakening
overnight. A soaking rainfall is the main hazard, through a
locally damaging wind gust cannot be ruled out. The chance for
showers and thunderstorms continue into Friday. Temperatures
tonight will fall into the mid 60s; high temperatures on Friday in
the low to mid 80s.

&&

.SHORT TERM...(This Evening through Friday)
Issued at 339 PM EDT Thu Aug 9 2018

Thunderstorms have begun to develop ahead of a cold front located
from south-central Wisconsin through northern Michigan. Earlier
this morning, a thunderstorm drifted along the southeast shores of
Lake Michigan. This feature decayed upon moving further inland
and its remnant outflow boundary is believed to be located along
the greater U.S. 30 corridor. This can be the focus for a few
storms this evening as well. Given our temperatures in the 80s and
dew points in the 70s, our surface environment is unstable. CAPE
values are 1500-2000 j/kg. However, wind shear is lacking and so
is upper-level flow. All told, the severe threat remains low.

Any storms this evening are expected to continue to move south and
east into the heart of our county warning area overnight,
weakening with the loss of daytime heating. By early Friday
morning, this front stalls south of U.S. 30 and invites some
uncertainty into the Friday forecast. The uncertainty is in
regards to shower/t-storm activity prior to noon. The front will
be the source of lift, PWATs and dew points will be favorable, but
the missing piece prior to noon is instability. So, I will offer
slight chance POPs in the morning, increasing to chance in the
afternoon.

&&

.LONG TERM...(Friday Night through Thursday)
Issued at 339 PM EDT Thu Aug 9 2018

Overnight Friday, in response to an upper-level trough digging in
from the Hudson Bay, the aformentioned cold front finally
propagates south and eastward. As this front exits, rain chances
will diminish for a brief time. The exception to this may be
northwest Ohio where the surface low is may be located. This may
keep some slight chance POPs in play. As we head into the weekend,
the upper-level trough becomes cut off from the mean flow aloft.
As such, we will be stuck with an upper-level low swirling over
the eastern Great Lakes. As the previous AFD author indicated,
there is some uncertainty as to how widespread shower/t-storm
chances are this weekend. The upper-level low bodes well in the
forcing department, but 12Z GFS PWATs indicate a negative PWAT
anomaly over our area this weekend. Our position on the northwest
side of the low will limit our moisture stream. Thunder will
likely be limited. Bottom line for the weekend: there is a small
chance for showers, but the weekend does not look to be a wash-
out.

Monday night and into Tuesday, the upper-level low finally gets
kicked out of the eastern Great Lakes as a potent trough sweeps
across Ontario. As such, Tuesday looks to be our transition day
between storm systems. By Wednesday, a second trough lifts out of
the Central Plains and can bring wet weather back to the forecast
as early as Wednesday morning. Depending on how this feature
phases (or fails to phase) with the Ontario trough, we could see a
soaking rain event perhaps lingering into Thursday.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday Afternoon)
Issued at 100 PM EDT Thu Aug 9 2018

VFR with wsw winds near 10 knots will remain the story this
afternoon. A subtle sfc trough and upper wave will swing in from
the northwest late this afternoon into tonight with chances for
scattered showers/storms across northern IN. Best chances look to
be in the 22-03z window at KSBN and 01-05z at KFWA.
Coverage/intensity remains uncertain given weakly forced
environment. Have thus opted for a VFR/VCTS mention as a result.
Some lower clouds/BR may fill in later tonight into Friday
morning, best chances at KFWA.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...NONE.
MI...NONE.
OH...NONE.
LM...NONE.
&&

SYNOPSIS...Brown
SHORT TERM...Brown
LONG TERM...Brown
AVIATION...Steinwedel

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Hazardous weather outlook, Aug 9, 2:57 PM EDT, 3 hours 58 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Northern Indiana
257 PM EDT Thu Aug 9 2018

INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005-
015-016-024-025-101900-
La Porte-St. Joseph IN-Elkhart-Lagrange-Steuben-Noble-De Kalb-Starke-
Pulaski-Marshall-Fulton IN-Kosciusko-Whitley-Allen IN-White-Cass IN-
Miami-Wabash-Huntington-Wells-Adams-Grant-Blackford-Jay-Berrien-
Cass MI-St. Joseph MI-Branch-Hillsdale-Williams-Fulton OH-Defiance-
Henry-Paulding-Putnam-Van Wert-Allen OH-
257 PM EDT Thu Aug 9 2018 /157 PM CDT Thu Aug 9 2018/

This Hazardous Weather Outlook is for northern Indiana, southwest
Michigan and northwest Ohio.

.DAY ONE...This afternoon and tonight.

There is a chance of thunderstorms late this afternoon and evening.
A few isolated strong to severe storms with damaging winds may be
possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

There is a chance for thunderstorms Friday afternoon. Severe weather
is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

LMZ043-046-101900-
New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI-
257 PM EDT Thu Aug 9 2018

This Hazardous Weather Outlook is for The Nearshore Waters of
Southeastern Lake Michigan.

.DAY ONE...This afternoon and tonight.

Thunderstorms are possible late this afternoon and may produce gusty
winds.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

In the hours before

Special weather statement, Aug 9, 6:11 PM EDT, 44 minutes before

Special Weather Statement
National Weather Service Northern Indiana
611 PM EDT THU AUG 9 2018

MIZ081-092245-
Hillsdale-
611 PM EDT THU AUG 9 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN HILLSDALE COUNTY...

At 611 PM EDT, a strong thunderstorm was located near Cement City, or
near Vandercook Lake, moving southeast at 30 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Somerset and Somerset Center.

Seek shelter until these storms pass.

&&

LAT...LON 4205 8436 4197 8436 4207 8451 4207 8437
TIME...MOT...LOC 2211Z 310DEG 24KT 4210 8442

MARSILI

Local storm report, Aug 9, 6:33 PM EDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
633 PM EDT THU AUG 9 2018

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

0550 PM     TSTM WND DMG     2 ENE WHITE PIGEON      41.81N 85.60W
08/09/2018                   ST. JOSEPH         MI   TRAINED SPOTTER

            REPORTS OF SEVERAL LARGE DOWNED TREE LIMBS
            (ONE OF 12 TO 14 INCHES) AND ARCING POWER
            LINES.

&&

MCD

Special weather statement, Aug 9, 6:34 PM EDT, 21 minutes before

Special Weather Statement
National Weather Service Northern Indiana
634 PM EDT THU AUG 9 2018

INZ005-006-092300-
Lagrange-Elkhart-
634 PM EDT THU AUG 9 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN ELKHART AND WESTERN
LAGRANGE COUNTIES...

At 633 PM EDT, a strong thunderstorm was located near Middlebury, or
12 miles west of Lagrange, moving east at 35 mph.

Wind gusts up to 50 mph and pea size hail are possible with this
storm.

Locations impacted include...
Lagrange, Middlebury, Scott, Shipshewana, Oliver Lake, Howe, Ontario
and Emma.

This includes Interstate 80 in Indiana between mile markers 105 and
117.

Seek shelter until these storms pass.

&&

LAT...LON 4172 8531 4154 8540 4169 8576 4176 8572
      4176 8553
TIME...MOT...LOC 2233Z 290DEG 30KT 4171 8564

MARSILI

Special weather statement, Aug 9, 6:43 PM EDT, 12 minutes before

Special Weather Statement
National Weather Service Northern Indiana
643 PM EDT THU AUG 9 2018

INZ006-007-092315-
Lagrange-Steuben-
643 PM EDT THU AUG 9 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN STEUBEN AND
SOUTHEASTERN LAGRANGE COUNTIES...

At 643 PM EDT, a strong thunderstorm was located 10 miles east of
Lagrange, moving southeast at 30 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Hamilton, Ashley, Hudson, Stroh, Mongo, Indianola, Brushy Prairie,
Pleasant Lake, Golden Lake, Elmira, Big Long Lake, Salem Center,
Helmer, Long Lake, Big Turkey Lake and Steubenville.

This includes Interstate 69 in Indiana between mile markers 341 and
345.

Seek shelter until this storm passes.
&&

LAT...LON 4161 8532 4172 8524 4153 8492 4153 8526
TIME...MOT...LOC 2243Z 306DEG 25KT 4162 8521

MARSILI

Special weather statement, Aug 9, 6:51 PM EDT, 4 minutes before

Special Weather Statement
National Weather Service Northern Indiana
651 PM EDT THU AUG 9 2018

INZ005-MIZ078-092330-
Elkhart-Cass-
651 PM EDT THU AUG 9 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN ELKHART AND
SOUTHEASTERN CASS COUNTIES...

At 651 PM EDT, a strong thunderstorm was located over Simonton Lake,
moving southeast at 25 mph.

Wind gusts up to 50 mph are possible with this storm.

Locations impacted include...
Elkhart, Simonton Lake, Middlebury, Bristol and Union.

This includes Interstate 80 in Indiana between mile markers 92 and
104.

Seek shelter until this storm passes.

&&

LAT...LON 4178 8578 4177 8579 4176 8578 4176 8575
      4170 8566 4169 8566 4157 8574 4175 8601
      4181 8584
TIME...MOT...LOC 2251Z 306DEG 21KT 4176 8592

MARSILI

Special weather statement, Aug 9, 6:55 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Northern Indiana
655 PM EDT THU AUG 9 2018

INZ004-005-092330-
St. Joseph-Elkhart-
655 PM EDT THU AUG 9 2018

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ELKHART AND
NORTHEASTERN ST. JOSEPH COUNTIES...

At 654 PM EDT, a strong thunderstorm was located over Georgetown,
moving southeast at 20 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
South Bend, Elkhart, Mishawaka, Georgetown, Granger, Dunlap, Osceola,
Roseland, Indian Village and Jimtown.

This includes Interstate 80 in Indiana between mile markers 77 and
84.

Seek shelter until this storm passes.

&&

LAT...LON 4165 8590 4154 8609 4168 8629 4176 8621
      4176 8618
TIME...MOT...LOC 2254Z 300DEG 16KT 4171 8620

MARSILI

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 5:49 PM EDT	Special Weather Statement	IWX	LaGrange	41 min
Aug 9, 6:10 PM EDT	Special Weather Statement	IWX	Steuben	35 min
Aug 9, 6:29 PM EDT	Severe Thunderstorm Warning	IWX	Steuben	46 min
Aug 9, 6:34 PM EDT	Special Weather Statement	IWX	LaGrange	26 min
Aug 9, 6:43 PM EDT	Special Weather Statement	IWX	Steuben	32 min
Aug 9, 6:47 PM EDT	Special Marine Warning	IWX		88 min
Aug 9, 6:51 PM EDT	Special Weather Statement	IWX	Elkhart	39 min
Aug 9, 7:00 PM EDT	Severe Thunderstorm Warning	IWX	Elkhart	25 min
Aug 9, 7:03 PM EDT	Special Weather Statement	IWX	LaGrange	57 min
Aug 9, 7:20 PM EDT	Severe Thunderstorm Warning	IWX	Elkhart	25 min
Aug 9, 7:23 PM EDT	Special Weather Statement	IWX	LaPorte	52 min
Aug 9, 7:31 PM EDT	Special Weather Statement	IWX	Noble	29 min
Aug 9, 7:44 PM EDT	Severe Thunderstorm Warning	IWX	Elkhart, Kosciusko, Noble	46 min
Aug 9, 7:54 PM EDT	Special Weather Statement	IWX	DeKalb	36 min
Aug 9, 7:11 PM EDT	Special Weather Statement	IWX	Williams	49 min
Aug 9, 6:03 PM EDT	Special Weather Statement	IWX	Cass	42 min
Aug 9, 6:11 PM EDT	Special Weather Statement	IWX	Hillsdale	34 min

Nearby

Special Weather Statements in Indiana, 2018 Every special weather statement in 2018

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.