Alert archive / Ohio / Special Weather Statements in 2021

Special Weather Statement, NWS Wilmington, OH

July 29, 2021Clark County, Madison County, Ohio

NWS Wilmington, OH issued this special weather statement at Jul 29, 2021, 4:35 PM EDT for Clark County, Madison County, Ohio. It was in force for 25 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 29, 2021, 4:35 PM EDT (20:35 UTC)
Expired: Jul 29, 2021, 5:00 PM EDT
In force: 25 min
Issued by: NWS Wilmington, OH

Counties Clark County, OH, Madison County, OH

The radar

The Cincinnati radar (KILN), 59 km from the middle of the area, began a volume at 20:35 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 57 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: 1163 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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 Wilmington, OH wrote its last area forecast discussion before this special weather statement went out at Jul 29, 4:17 PM EDT, 18 minutes earlier.

Area forecast discussion, Jul 29, 4:17 PM EDT, 18 minutes before

AREA FORECAST DISCUSSION
National Weather Service Wilmington OH
417 PM EDT Thu Jul 29 2021

.SYNOPSIS...
Strong to severe thunderstorms possible through late evening
Thursday. Cold front swings through tonight, providing cooler
and drier into Friday and Saturday. A slight chance for showers
exists Sunday, but an extended period of below average
temperatures is expected into the beginning of the next work
week.

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
A severe thunderstorm watch has been issued for all of our
counties with the exception of our northern three (Hardin,
Auglaize and Mercer) until 10 PM EDT. A cluster of storms
tracking southeast through western Ohio and central Ohio have
already produced a number of severe reports - mainly for hail
greater than 1" in diameter. While strong, damaging winds and
large hail will continue to be the primary threat, several
supercells have formed and will keep the threat for isolated
tornadoes present with these storms. Additionally, some storms
have begun training in central Ohio, which may lead to localized
flooding issues.

More favorable 0-6km effective shear remains across our eastern
counties in central Ohio where closer to 40 kts is present.
These values drop off to near 25 kts towards our western
counties. SPC mesoanalysis shows MLCAPE near 2000 J/kg where
these storms are located in west-central Ohio. A very moist and
unstable environment will remain in place through the evening,
keeping strong to severe thunderstorms present for the time
being. Our northern counties in central Ohio will have the
severe threat end by this evening as storms push further south
over the next couple of hours. After about 10pm, the severe
threat will begin to diminish, with only some scattered showers
possible overnight as the cold front swings through. There could
be some river fog development as well - especially further
south towards the Ohio River where the moisture will remain
higher the longest.

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/...
Drier air filters in on Friday as northwesterly flow persists
aloft and surface winds shift out of the north. Some post-
frontal stratus clouds will linger during the early morning
hours before lifting. Still expecting scattered cu development
during the day with weak instability present, but surface high
pressure building in from the upper Midwest will offer drier
conditions across the fa. Additionally, a relief from the heat
and humidity will be felt as dewpoints drop to near or just
below 60 (compared to low to mid-70s on Thursday) with high
temperatures topping off in the middle 70s to lower 80s.

&&

.LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/...
Surface high pressure will be across the region on Saturday. Under a
northwest flow aloft, a disturbance will pass by to our southwest.
It looks like pcpn with this system will stay mostly out of our
area, so we are expecting dry conditions. Highs will range from 75
to 80.

A broad mid level trough will dig southeast across the Great Lakes
Saturday night into Sunday. This will push a weak cold front east
through the area, bringing a low chance for a shower or
thunderstorm. It will remain a little cool for the beginning of
August.

For the reminder of the forecast, Monday through Thursday, broad mid
level troughing will remain with weak high pressure across the Ohio
Valley at the surface. It should stay mainly dry through the period
with very low chances of pcpn perhaps by late in the week. It will
continue a little below normal early week, then closer to normal
later in the week.

&&

.AVIATION /20Z THURSDAY THROUGH TUESDAY/...
Scattered storms expected to develop this afternoon and linger
into the late evening hours. Some of these storms will be strong
to severe. Have included a tempo group at every taf site to
indicate potential timing of TSRA based on latest model
guidance. Heavy downpours will lead to reduced vsbys and some
MVFR CIG reductions - IFR reductions are less likely but could
happen briefly in stronger storms. Strong wind gusts and large hail
will be the primary threats with these storms. Included an
increase in wind gusts to near 25 kts in the tempo group, but
will monitor trends and amend if stronger gusts are expected
with thunderstorms.

Thunderstorm threat diminishes this evening from north to south,
but a few storms could linger until about midnight for our
southern taf sites. Afterwards, a number of sites will observe
MVFR CIG and vsby reductions overnight with the passing cold
front. Surface winds will shift towards the north-northwest, but
remain fairly light below 10 kts overnight.

May have held onto MVFR CIGs longer than needed, but CIG
improvement to VFR is expected around sunrise on Friday.
Prevailing VFR expected the remainder of the taf period on
Friday with light northerly winds.

.OUTLOOK... MVFR ceilings and visibilities are possible
Saturday night into Sunday.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...None.
KY...None.
IN...None.

&&

SYNOPSIS...Clark
NEAR TERM...Clark
SHORT TERM...Clark
LONG TERM...Hickman
AVIATION...Clark

Hazardous weather outlook, Jul 29, 5:10 AM EDT, 11 hours 25 minutes before

Hazardous Weather Outlook
National Weather Service Wilmington OH
510 AM EDT Thu Jul 29 2021

INZ050-OHZ026-034-035-042>046-051>056-060>065-072>074-080-300915-
Wayne-Hardin-Mercer-Auglaize-Darke-Shelby-Logan-Union OH-Delaware-
Miami-Champaign-Clark-Madison-Franklin OH-Licking-Preble-Montgomery-
Greene-Fayette OH-Pickaway-Fairfield-Clinton-Ross-Hocking-Highland-
510 AM EDT Thu Jul 29 2021

This Hazardous Weather Outlook is for East Central Indiana, Central
Ohio, South Central Ohio, Southwest Ohio and West Central Ohio.

.DAY ONE...Today and tonight.

Showers and thunderstorms this morning are not expected to be severe.
However, additional thunderstorms are forecast to develop this
afternoon. A few severe storms will be possible with damaging winds
being the primary threat. Large hail or an isolated tornado cannot be
ruled out.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon.

INZ058-059-066-073>075-080-KYZ089>100-OHZ070-071-077>079-081-082-088-
300915-
Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio-Switzerland-
Carroll-Gallatin-Boone-Kenton-Campbell-Owen-Grant-Pendleton-Bracken-
Robertson-Mason-Lewis-Butler-Warren-Hamilton-Clermont-Brown-Adams-
Pike-Scioto-
510 AM EDT Thu Jul 29 2021

This Hazardous Weather Outlook is for East Central Indiana,
Southeast Indiana, Northeast Kentucky, Northern Kentucky, South
Central Ohio and Southwest Ohio.

.DAY ONE...Today and tonight.

The heat index will be between 95 and 100 this afternoon.

Thunderstorms will develop and move across the area this afternoon
into the evening. A few severe storms will be possible with damaging winds
being the primary threat. Large hail or an isolated tornado cannot be
ruled out.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

In the hours before

Local storm report, Jul 29, 3:27 PM EDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
327 PM EDT THU JUL 29 2021

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

0309 PM     HAIL             2 N DOWNTOWN COLUMBUS   39.99N 83.01W
07/29/2021  M1.00 INCH       FRANKLIN           OH   PUBLIC

            MULTIPLE REPORTS OF QUARTER SIZED HAI NEAR SHORT NORTH
            AND DOWNTOWN COLUMBUS.

&&

MEC

Special weather statement, Jul 29, 3:37 PM EDT, 58 minutes before

Special Weather Statement
National Weather Service Wilmington OH
337 PM EDT Thu Jul 29 2021

OHZ045-046-055-292000-
Delaware OH-Franklin OH-Union OH-
337 PM EDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN FRANKLIN...DELAWARE AND
SOUTHEASTERN UNION COUNTIES IN CENTRAL OHIO UNTIL 400 PM EDT...

At 337 PM EDT, radar indicated a strong thunderstorm over Powell,
moving east at 45 mph.

STORM HAZARDS INCLUDE...
Winds to 45 mph...
One half inch diameter hail...

Locations impacted include...
Columbus, Dublin, Westerville, Reynoldsburg, Delaware, Upper
Arlington, Gahanna, Worthington, Powell, Sunbury, Plain City, Minerva
Park, New California, Polaris, Easton, New Albany, Shawnee Hills,
Galena, Ostrander and Riverlea.

This includes I-71 in Ohio between mile markers 114 and 135.

To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.

LAT...LON 3996 8278 4009 8321 4011 8321 4011 8329
      4034 8325 4032 8275
TIME...MOT...LOC 1937Z 277DEG 41KT 4019 8310

Hatzos

Special weather statement, Jul 29, 3:44 PM EDT, 51 minutes before

Special Weather Statement
National Weather Service Wilmington OH
344 PM EDT Thu Jul 29 2021

OHZ052>054-292015-
Champaign OH-Madison OH-Clark OH-
344 PM EDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN CHAMPAIGN...
NORTHEASTERN CLARK AND NORTHEASTERN MADISON COUNTIES UNTIL 415 PM
EDT...

At 344 PM EDT, radar indicated a strong thunderstorm near
Mechanicsburg, moving southeast at 40 mph.

STORM HAZARDS INCLUDE...
Winds to 40 mph...
One half inch diameter hail...

Locations impacted include...
Urbana, London, West Jefferson, Mechanicsburg, Choctaw Lake,
Brighton, Lafayette, South Vienna, Catawba, Mutual, Rosedale,
Resaca, Powhattan, Catawba Station, Plumwood and New Moorefield.

This includes I-70 in Ohio between mile markers 67 and 81.

To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.

LAT...LON 4012 8350 4011 8344 4009 8328 3991 8334
      3988 8351 4001 8375 4015 8372
TIME...MOT...LOC 1944Z 296DEG 36KT 4006 8361

Hatzos

Special weather statement, Jul 29, 4:06 PM EDT, 29 minutes before

Special Weather Statement
National Weather Service Wilmington OH
406 PM EDT Thu Jul 29 2021

OHZ056-292030-
Licking OH-
406 PM EDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT LICKING COUNTY UNTIL 430 PM
EDT...

At 405 PM EDT, radar indicated a strong thunderstorm over Johnstown,
moving east at 35 mph.

STORM HAZARDS INCLUDE...
Winds to 40 mph...
Penny size hail...

Locations impacted include...
Newark, Heath, Granville, Pataskala, Johnstown, Utica, Hanover,
Granville South, Marne, Jersey, Alexandria, Hartford, St.
Louisville, Toboso, Fredonia, Purity and Fallsburg.

To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.

LAT...LON 3999 8221 4005 8274 4024 8275 4025 8248
      4024 8218
TIME...MOT...LOC 2005Z 274DEG 32KT 4015 8268

Hatzos

Special weather statement, Jul 29, 4:07 PM EDT, 28 minutes before

Special Weather Statement
National Weather Service Wilmington OH
407 PM EDT Thu Jul 29 2021

OHZ055-056-065-292030-
Licking OH-Fairfield OH-Franklin OH-
407 PM EDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL FRANKLIN...NORTHWESTERN
FAIRFIELD AND SOUTHWESTERN LICKING COUNTIES UNTIL 430 PM EDT...

At 406 PM EDT, radar indicated a strong thunderstorm over Ohio State
University, moving southeast at 40 mph.

STORM HAZARDS INCLUDE...
Winds to 40 mph...
One half inch diameter hail...

Locations impacted include...
Columbus, Dublin, Westerville, Reynoldsburg, Upper Arlington,
Gahanna, Hilliard, Pickerington, Worthington, Bexley, Pataskala,
Canal Winchester, Groveport, Minerva Park, Ohio State University,
Beechwood Trails, Easton, Summit Station, Whitehall and Etna.

This includes the following Interstates...
 I-70 in Ohio between mile markers 92 and 118.
 I-71 in Ohio between mile markers 104 and 120.

To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.

LAT...LON 3981 8278 4001 8322 4014 8310 4014 8304
      4003 8263
TIME...MOT...LOC 2006Z 298DEG 34KT 4003 8301

Hatzos

Special weather statement, Jul 29, 4:35 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Wilmington OH
435 PM EDT Thu Jul 29 2021

OHZ053-054-292100-
Madison OH-Clark OH-
435 PM EDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT EASTERN CLARK AND SOUTHWESTERN
MADISON COUNTIES UNTIL 500 PM EDT...

At 435 PM EDT, radar indicated a strong thunderstorm 5 miles
northeast of Springfield, moving southeast at 25 mph.

STORM HAZARDS INCLUDE...
Winds to 40 mph...
One half inch diameter hail...

Locations impacted include...
Springfield, London, South Charleston, Choctaw Lake, Harmony, Lisbon,
Brighton, Lafayette, South Vienna, Catawba, Newport, Buck Creek State
Park, New Moorefield and Plattsburg.

This includes I-70 in Ohio between mile markers 57 and 76.

To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.

LAT...LON 4002 8364 3993 8337 3981 8342 3974 8355
      3991 8381 4002 8375
TIME...MOT...LOC 2035Z 305DEG 23KT 3993 8364

Hatzos

The office that day

Everything else NWS Wilmington, OH issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 6:30 AM EDT	Special Weather Statement	ILN	Auglaize, Mercer	60 min
Jul 29, 7:19 AM EDT	Special Weather Statement	ILN	Darke	41 min
Jul 29, 9:51 AM EDT	Special Weather Statement	ILN	Licking	39 min
Jul 29, 2:29 PM EDT	Special Weather Statement	ILN	Franklin	31 min
Jul 29, 2:49 PM EDT	Severe Thunderstorm Warning	ILN	Delaware, Fairfield, Franklin, Licking	41 min
Jul 29, 3:13 PM EDT	Special Weather Statement	ILN	Licking	17 min
Jul 29, 3:13 PM EDT	Severe Thunderstorm Warning	ILN	Fairfield, Franklin, Pickaway	47 min
Jul 29, 3:37 PM EDT	Special Weather Statement	ILN	Delaware	23 min
Jul 29, 3:43 PM EDT	Severe Thunderstorm Warning	ILN	Delaware, Franklin, Licking, Madison, Union	24 min
Jul 29, 3:44 PM EDT	Special Weather Statement	ILN	Madison	31 min
Jul 29, 3:50 PM EDT	Severe Thunderstorm Warning	ILN	Fairfield, Franklin	40 min
Jul 29, 3:57 PM EDT	Severe Thunderstorm Warning	ILN	Champaign, Clark, Madison	48 min
Jul 29, 4:06 PM EDT	Areal Flood Advisory	ILN	Franklin	114 min
Jul 29, 4:06 PM EDT	Special Weather Statement	ILN	Licking	24 min
Jul 29, 4:07 PM EDT	Special Weather Statement	ILN	Franklin	23 min
Jul 29, 4:24 PM EDT	Severe Thunderstorm Warning	ILN	Fairfield, Hocking	37 min
Jul 29, 4:43 PM EDT	Severe Thunderstorm Warning	ILN	Fayette, Franklin, Madison, Pickaway	47 min
Jul 29, 4:48 PM EDT	Severe Thunderstorm Warning	ILN	Clark, Fayette, Madison	42 min
Jul 29, 5:00 PM EDT	Severe Thunderstorm Warning	ILN	Fayette, Pickaway, Ross	45 min
Jul 29, 5:01 PM EDT	Areal Flood Advisory	ILN	Clark, Franklin, Madison, Pickaway	85 min
Jul 29, 5:20 PM EDT	Tornado Warning	ILN	Pickaway, Ross	25 min
Jul 29, 5:24 PM EDT	Severe Thunderstorm Warning	ILN	Fayette, Highland, Ross	66 min
Jul 29, 5:44 PM EDT	Special Weather Statement	ILN	Greene	31 min
Jul 29, 5:58 PM EDT	Severe Thunderstorm Warning	ILN	Pike, Ross, Scioto	62 min
Jul 29, 6:13 PM EDT	Severe Thunderstorm Warning	ILN	Clinton, Fayette, Greene	47 min
Jul 29, 6:34 PM EDT	Areal Flood Advisory	ILN	Fayette, Greene, Highland, Pickaway, Pike, Ross	3 hr
Jul 29, 6:51 PM EDT	Special Weather Statement	ILN	Fayette, Greene	24 min
Jul 29, 6:55 PM EDT	Special Weather Statement	ILN	Pike, Scioto	35 min
Jul 29, 7:02 PM EDT	Special Weather Statement	ILN	Clinton	28 min
Jul 29, 7:25 PM EDT	Special Weather Statement	ILN	Pike, Scioto	35 min
Jul 29, 7:26 PM EDT	Special Weather Statement	ILN	Highland	34 min
Jul 29, 7:45 PM EDT	Areal Flood Advisory	ILN	Adams, Clinton, Fayette, Greene, Highland, Pike and 1 more	4 hr
Jul 29, 7:52 PM EDT	Special Weather Statement	ILN	Adams, Highland	38 min
Jul 29, 6:20 PM EDT	Severe Thunderstorm Warning	ILN	Fayette, Franklin, Ripley	40 min

Nearby

Special Weather Statements in Ohio, 2021 Every special weather statement in 2021

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.