Special Weather Statement, NWS Northern Indiana

Area Forecast Discussion
National Weather Service Northern Indiana
330 AM EDT Mon Jul 10 2017

.SYNOPSIS...
Issued at 330 AM EDT Mon Jul 10 2017

Two rounds of showers and storms are expected today. The first will
arrive this morning with isolated heavy rain and gusty winds
possible. The second round will arrive this evening with damaging
winds...hail...and heavy rain possible. This heavy rain could cause
isolated flooding...especially in areas that saw heavy rain on
Friday. A brief break is expected on Tuesday but additional storms
are expected Wednesday into Thursday. Heat and humidity values will
steadily increase through the middle of the week.

&&

.SHORT TERM...(Today and Tonight)
Issued at 330 AM EDT Mon Jul 10 2017

MCS rolling across the Upper Midwest as expected this morning,
fueled by steep midlevel lapse rates, strong shear, and nearly 3000
J/kg of MUCAPE with excellent LLJ and associated moisture transport.
Forward propagating Corfidi vectors and thickness lines continue to
suggest more of an eastward turn this morning with main area of
convection moving into our CWA around 12Z. (Additional SCT storms
will likely continue in our east as well.) MCS maintenance
parameters not as favorable over our area with weaker midlevel lapse
rates and less supportive mean flow/shear (southerly 0-2 km SR winds
also less favorable with eastward hook into our area). While the
threat for an organized MCS/significant severe weather event is low,
ample 850mb moisture advection (850mb dewpoints near 15C) and still
modest lapse rates aloft will support up to 2000 J/kg of MUCAPE with
enough flow to support an isolated damaging wind/hail threat. MCS
actually already looking a bit ragged on radar mosaic and suspect
impinging LLJ will favor additional development ahead of the main
line, beginning in our NW in a few hours. While isolated severe
threat is possible, heavy rain and flooding will be larger concern.
Widespread area of moderate rain seen on radar mosaic and expect
this will envelope our CWA later this morning. Atmospheric moisture
is not extremely high but PW values are over 1.5 inches and warm
cloud depths are around 12 kft. However, HRRR indicating more of a
north-south orientation to the line with limited backbuilding/
training potential and upstream rainfall reports so far have not
been particularly impressive for most areas. Main concern for flash
flooding will be in areas impacting by Friday's rain. Corridor of
Friday's rain was intense but also narrow with very little precip on
either side. Therefore expect just isolated flooding threat and will
hold with just ESF/HWO for now.

Question remains what the impact of this morning convection will be
on afternoon/evening activity. Typically this morning convection
would trash our evening chances but as previously noted, tremendous
low level moisture advection anticipated with 40+ kt LLJ sending a
pronounced 850mb theta-e ridge into our region from the Central
Plains. 850mb dewpoints approach 18C with PW values climbing near 2
inches. While the impact of morning storms remains somewhat unclear,
this moisture advection (in concert with midlevel lapse rates
climbing to 7 C/km) would suggest enough instability for a second
round of strong/severe storms this evening as SBCAPE values
potentially climb to near 3000 J/kg by 00Z. And with 40+ kts at
850mb and tremendous veering through the column, it will not take
much to produce organized clusters of storms with damaging winds.
While the threat of tornadoes is low due to lack of significantly
backed near-surface wind/"hockey-stick" hodographs, they cannot be
ruled out given good 0-1km shear/helicity and relatively low LCL's
in moist environment. Deep layer shear of 35-40 kts also supports
potential for supercells, assuming adequate instability, with hail
also a concern. Best chances of severe weather likely along and
south of US-30 in the 21-06Z timeframe as suggested by the WRF-ARW
given potentially less impact from morning activity and better
proximity to best moisture plume. However, difficult to rule out the
northern counties either. Heavy rain/flooding also obviously a
concern if instability field does recover and support widespread/
sustained updrafts. Will defer to day shift to nail down details
with benefit of seeing exactly how AM convection evolves but the
threat for both severe weather and flooding is certainly there.

&&

.LONG TERM...(Tuesday through Sunday)
Issued at 330 AM EDT Mon Jul 10 2017

Bright side to today's very active weather is that most 00Z guidance
now suggest enough ridging/subsidence in highly worked-over
environment to push boundary south of our area on Tuesday and give a
break from busy weather. A few storms possible in our far south Tues
afternoon but most of the CWA now appears dry and have cut back PoPs
even further. Break will be relatively short-lived though as next
trough approaches the northern Lakes and increasing/backing low
level flow will send front northward again late Tues night/Wed. Some
brief strong storms/heavy rain may be possible early Wed morning
(especially in our north) but best isentropic ascent and moisture
convergence appear to focus over central MI on Wed with our CWA in
capped warm sector. Better chances will arrive Wed night into Thu as
cold front finally pushes south and scours out moisture/instability.
Severe weather will be possible with this cold front given moderate
instability, decent shear, and good forcing. Much will depend on
exact timing though, which is a bit uncertain at this range. Dry to
end the work week but secondary cold front possible sometime late
Saturday per both latest GFS and ECMWF.

&&

.AVIATION...(For the 06Z TAFS through 06Z Monday Night)
Issued at 108 AM EDT Mon Jul 10 2017

Generally vfr conditions during this taf period, but there will be
some TSRA with lower flight conditions at times. Strong low warm
advection providing lift for sct shra/ts development over nrn IN
in past hour. This activity should impact FWA early this morning.
Sufficient instability in place to allow MCS over the upr Midwest
to track se across nrn IN between 10-15z resulting in tsra with
mvfr conditions or lower at the terminals in this timeframe. Sct
TSRA expected to redevelop late this aftn/eve as airmass
destabilizes with diurnal heating and low currently over nw IA
moves east to srn Lake Michigan.

&&

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

SYNOPSIS...AGD
SHORT TERM...AGD
LONG TERM...AGD
AVIATION...JT

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Hazardous Weather Outlook
National Weather Service Northern Indiana
456 AM EDT Mon Jul 10 2017

INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005-
015-016-024-025-110900-
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-
456 AM EDT Mon Jul 10 2017 /356 AM CDT Mon Jul 10 2017/

This hazardous weather outlook is for portions of southwest
Michigan...northern Indiana and northwest Ohio.

.DAY ONE...Today and Tonight

Additional thunderstorms are expected this morning. Widespread
severe weather is not anticipated, but an isolated strong to severe
thunderstorm is possible with isolated damaging winds...hail...and
locally heavy rainfall. Additional thunderstorms are expected to
develop this evening. Some of these storms may be severe with
damaging winds...hail...and heavy rain. Localized flooding is
possible...especially in areas that saw heavy rain on Friday.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Additional thunderstorms are expected on Wednesday and Thursday.
Severe weather may be possible but confidence is low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

&&

Stay tuned to NOAA Weather Radio for further details or updates...or
check our web site at weather.gov/iwx

LMZ043-046-110900-
New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI-
456 AM EDT Mon Jul 10 2017

This hazardous weather outlook is for portions of The Nearshore
Waters of Southeastern Lake Michigan.

.DAY ONE...Today and Tonight

Thunderstorms are expected this morning and again this evening. Some
of the storms may be strong to severe.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Additional thunderstorms are possible Wednesday and Thursday.

&&

Stay tuned to NOAA Weather Radio for further details or updates...or
check our web site at weather.gov/iwx

Special Weather Statement
National Weather Service Northern Indiana
413 AM EDT MON JUL 10 2017

INZ018-026-027-OHZ015-024-100845-
Adams-Allen-Wells-Van Wert-Paulding-
413 AM EDT MON JUL 10 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN ALLEN...
NORTHEASTERN WELLS...NORTHERN ADAMS...SOUTHWESTERN PAULDING AND
NORTHWESTERN VAN WERT COUNTIES...

At 413 AM EDT, a strong thunderstorm was located near Ossian, moving
east at 25 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Fort Wayne, Decatur, Ossian, Monroeville, Payne, Convoy, Middletown,
Middlebury, Preble, Dixon, Magley, Poe, Hessen Cassel, Monmouth,
Zulu, Maples, Mcgill, Tocsin, Hoagland and Tillman.

This includes Interstate 469 between mile markers 5 and 6, and
between mile markers 9 and 16.

Torrential rainfall is also occurring with this storm, and may cause
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.

LAT...LON 4082 8515 4100 8518 4108 8473 4081 8469
TIME...MOT...LOC 0813Z 264DEG 21KT 4092 8509

NWS

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