Excessive Heat and Heat in Illinois, July 1 to 5, 2018

Name: Excessive Heat and Heat in Illinois, July 1 to 5, 2018
Start: 2018-07-01T00:00
End: 2018-07-05T18:00
Location: Illinois

July 1 to 5, 2018 · NWS PAH · 38 events in 19 counties and zones

Where it happened

Every event with a place to put it; 38 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

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Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 38

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PAH wrote it up.

The prolonged period of hazardous heat and humidity that began on June 29th persisted through the first several days of July. The most dangerous heat index values occurred on July 5th, when afternoon heat indices peaked around 110 degrees. Otherwise, the peak heat index each afternoon was near 105. Actual air temperatures were mostly in the lower to mid 90's. South winds ahead of a cold front brought heat and humidity on the 1st. The front stalled over the lower Ohio Valley on the 2nd, then returned northward. Another cold front approached on the 5th, preceded by hot and humid southwest winds.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Paducah, KY wrote its last area forecast discussion before the first event at Jun 30, 10:45 PM CST, 1 hour 15 minutes earlier.

Area forecast discussion, Jun 30, 10:45 PM CST, 1 hour 15 minutes before

Area Forecast Discussion
National Weather Service Paducah KY
1145 PM CDT Sat Jun 30 2018

.UPDATE...
Issued at 1145 PM CDT Sat Jun 30 2018

Updated for the 06Z aviation forecast discussion.

&&

.SHORT TERM...(Tonight through Monday night)
Issued at 130 PM CDT Sat Jun 30 2018

Going Heat Advisory looks good for today. Values Sunday back into
the 100 to 105 degree range, many areas pushing 105. We decided to
continue the Advisory another day as a result. We could see 100 to
105 max values Monday. That would put us at 4 days in a row, thus
another reason for the extension.

Monitoring SEMO, and the west 1/2 of the CWFA for isolated
afternoon convection. CAMs handling this fairly well as some
development seen on the nose of weak mid level DPVA. Very
unstable, but a weak shear environment. Pulse storms may be strong
and push brief severe. Overall chance quite limited. Should be
quiet overnight. Chances for isolated convection Sunday lower, but
not zero. Will keep PoPs silent for now as a weak shear axis
shifts across the area with a region of lower overall mean RH.
Chance for storms appears a bit higher on Monday as deeper
moisture pushes back slightly to the west.

.LONG TERM...(Tuesday through Saturday)
Issued at 130 PM CDT Sat Jun 30 2018

Fairly high confidence in the extended as models remain in good
agreement with synoptic scale features.

The heat will persist through the week with heat index values
reaching or surpassing 100 degrees each day. However Friday into
Saturday we expect at least a weak cold front to move through. This
will result in higher chances of rain and slightly cooler
temperatures. However through the week we expect daily chances of
storms. Coverage is not expected to be good but any storms that do
fire up should be strong at the very least with CAPE ranging from
1500 to nearly 3k j/kg2 and LI's negative 5 to 8. Outside of peak
heating and especially overnight ridging aloft or overhead should
inhibit storm development. Considering abundant moisture and warm
temperatures we can not rule out aftn chances of thunderstorm. The
upper ridge will retrograde westward late in the week. This will
allow for the expected frontal passage as we head into next weekend.
The warm temperatures and high humidity appear to be the main threat
through the extended. Heat index values will likely remain slightly
below advisory criteria...the longevity of the heat wave will
increase the danger of heat exhaustion or heat stroke.

&&

.AVIATION...
Issued at 1145 PM CDT Sat Jun 30 2018

Mainly VFR conditions anticipated through the end of the day
Sunday. However, brief MVFR vsbys possible around sunrise Sunday.
Light winds overall but becoming southerly on Sunday. Diurnal cu
will return on Sunday as well, with the better coverage east of
the Mississippi River. Any convection should be isolated and
confined to the late afternoon. Winds die down after sunset.

&&

.PAH WATCHES/WARNINGS/ADVISORIES...
IL...Heat Advisory until 8 PM CDT Sunday for ILZ075>078-080>094.

MO...Heat Advisory until 8 PM CDT Sunday for MOZ076-086-087-100-
     107>112-114.

IN...Heat Advisory until 8 PM CDT Sunday for INZ081-082-085>088.

KY...Heat Advisory until 8 PM CDT Sunday for KYZ001>022.

&&

Hazardous weather outlook, Jun 30, 12:59 PM CST, 11 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Paducah KY
159 PM CDT Sat Jun 30 2018

ILZ075>078-080>094-INZ081-082-085>088-KYZ001>022-MOZ076-086-087-
100-107>112-114-011000-
Jefferson-Wayne IL-Edwards-Wabash-Perry IL-Franklin-Hamilton-
White-Jackson-Williamson-Saline-Gallatin-Union-Johnson-Pope-
Hardin-Alexander-Pulaski-Massac-Gibson-Pike-Posey-Vanderburgh-
Warrick-Spencer-Fulton-Hickman-Carlisle-Ballard-McCracken-Graves-
Livingston-Marshall-Calloway-Crittenden-Lyon-Trigg-Caldwell-
Union KY-Webster-Hopkins-Christian-Henderson-Daviess-McLean-
Muhlenberg-Todd-Perry MO-Bollinger-Cape Girardeau-Wayne MO-Carter-
Ripley-Butler-Stoddard-Scott-Mississippi-New Madrid-
159 PM CDT Sat Jun 30 2018

This Hazardous Weather Outlook is for portions of southern
Illinois, southwest Indiana, western Kentucky, and southeast
Missouri.

.DAY ONE...Today and Tonight

A Heat Advisory remains in effect. Refer to the product for details.

Isolated thunderstorms will continue mainly near and west of the
Mississippi River to the Ozark Foothill region through sunset.
Stronger storms may produce strong gusty winds and brief but very
heavy rainfall.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Hot and humid conditions will continue. A Heat Advisory is in effect
through early Sunday evening.

There is a daily chance of thunderstorms. Isolated strong to severe
storms cannot be ruled out, with damaging wind the primary concern.
Locally heavy rain is possible as well.

.SPOTTER INFORMATION STATEMENT...

Spotter activation should not be required.

In the hours before

Local storm report, Jun 30, 6:42 PM CST, 5 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PADUCAH KY
742 PM CDT SAT JUN 30 2018

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

1004 AM     TSTM WND DMG     1 SE GRIFFIN            38.19N 87.90W
06/26/2018                   POSEY              IN   NWS STORM SURVEY

            A MICROBURST WITH PEAK ESTIMATED WINDS OF 90 MPH OCCURRED
            ALONG A 25 MILE PATH FROM NW POSEY COUNTY INTO SOUTHERN
            GIBSON COUNTY. THE MICROBURST BEGAN APPROXIMATLY 1.6
            MILES SE OF GRIFFIN AND ENDED 7.5 MILES E OF FORT BRANCH.
            THE DAMAGE SWATH WAS AS MUCH AS TWO MILES WIDE. THE MOST
            INTENSE DAMAGE OCCURRED IN AND NEAR FORT BRANCH. AT LEAST
            10 HOMES SUSTAINED MINOR SHINGLE AND EXTERIOR DAMAGE. TWO
            BARNS WERE HEAVILY DAMAGED NEAR FORT BRANCH. A SEMI WAS
            BLOWN OVER ON THE SOUTH SIDE OF FORT BRANCH.

&&

DWS

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

19 heat, 19 excessive heat. Local standard time, as filed.

Heat, Alexander

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Alexander forecast zone
Reported by: Mesonet
Coordinates: 37.192, -89.338 (the zone’s center; the record gives no point)

Heat, Edwards

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Edwards forecast zone
Reported by: Mesonet
Coordinates: 38.417, -88.053 (the zone’s center; the record gives no point)

Heat, Franklin

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Franklin forecast zone
Reported by: Mesonet
Coordinates: 37.992, -88.924 (the zone’s center; the record gives no point)

Heat, Gallatin

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Gallatin forecast zone
Reported by: Mesonet
Coordinates: 37.763, -88.230 (the zone’s center; the record gives no point)

Heat, Hamilton

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Hamilton forecast zone
Reported by: Mesonet
Coordinates: 38.082, -88.539 (the zone’s center; the record gives no point)

Heat, Hardin

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Hardin forecast zone
Reported by: Mesonet
Coordinates: 37.518, -88.267 (the zone’s center; the record gives no point)

Heat, Jackson

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Jackson forecast zone
Reported by: Mesonet
Coordinates: 37.785, -89.382 (the zone’s center; the record gives no point)

Heat, Jefferson

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Jefferson forecast zone
Reported by: Mesonet
Coordinates: 38.301, -88.924 (the zone’s center; the record gives no point)

Heat, Johnson

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Johnson forecast zone
Reported by: Mesonet
Coordinates: 37.460, -88.881 (the zone’s center; the record gives no point)

Heat, Massac

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Massac forecast zone
Reported by: Mesonet
Coordinates: 37.219, -88.708 (the zone’s center; the record gives no point)

Heat, Perry

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Perry forecast zone
Reported by: Mesonet
Coordinates: 38.084, -89.367 (the zone’s center; the record gives no point)

Heat, Pope

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Pope forecast zone
Reported by: Mesonet
Coordinates: 37.413, -88.562 (the zone’s center; the record gives no point)

Heat, Pulaski

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Pulaski forecast zone
Reported by: Mesonet
Coordinates: 37.223, -89.127 (the zone’s center; the record gives no point)

Heat, Saline

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Saline forecast zone
Reported by: Mesonet
Coordinates: 37.753, -88.541 (the zone’s center; the record gives no point)

Heat, Union

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Union forecast zone
Reported by: Mesonet
Coordinates: 37.471, -89.255 (the zone’s center; the record gives no point)

Heat, Wabash

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Wabash forecast zone
Reported by: Mesonet
Coordinates: 38.446, -87.844 (the zone’s center; the record gives no point)

Heat, Wayne

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Wayne forecast zone
Reported by: Mesonet
Coordinates: 38.430, -88.426 (the zone’s center; the record gives no point)

Heat, White

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: White forecast zone
Reported by: Mesonet
Coordinates: 38.088, -88.180 (the zone’s center; the record gives no point)

Heat, Williamson

When: July 1, 12:00 AM CST to July 5, 10:00 AM CST
Where: Williamson forecast zone
Reported by: Mesonet
Coordinates: 37.730, -88.930 (the zone’s center; the record gives no point)

Excessive Heat, Alexander

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Alexander forecast zone
Reported by: Mesonet
Coordinates: 37.192, -89.338 (the zone’s center; the record gives no point)

Excessive Heat, Edwards

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Edwards forecast zone
Reported by: Mesonet
Coordinates: 38.417, -88.053 (the zone’s center; the record gives no point)

Excessive Heat, Franklin

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Franklin forecast zone
Reported by: Mesonet
Coordinates: 37.992, -88.924 (the zone’s center; the record gives no point)

Excessive Heat, Gallatin

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Gallatin forecast zone
Reported by: Mesonet
Coordinates: 37.763, -88.230 (the zone’s center; the record gives no point)

Excessive Heat, Hamilton

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Hamilton forecast zone
Reported by: Mesonet
Coordinates: 38.082, -88.539 (the zone’s center; the record gives no point)

Excessive Heat, Hardin

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Hardin forecast zone
Reported by: Mesonet
Coordinates: 37.518, -88.267 (the zone’s center; the record gives no point)

Excessive Heat, Jackson

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Jackson forecast zone
Reported by: Mesonet
Coordinates: 37.785, -89.382 (the zone’s center; the record gives no point)

Excessive Heat, Jefferson

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Jefferson forecast zone
Reported by: Mesonet
Coordinates: 38.301, -88.924 (the zone’s center; the record gives no point)

Excessive Heat, Johnson

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Johnson forecast zone
Reported by: Mesonet
Coordinates: 37.460, -88.881 (the zone’s center; the record gives no point)

Excessive Heat, Massac

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Massac forecast zone
Reported by: Mesonet
Coordinates: 37.219, -88.708 (the zone’s center; the record gives no point)

Excessive Heat, Perry

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Perry forecast zone
Reported by: Mesonet
Coordinates: 38.084, -89.367 (the zone’s center; the record gives no point)

Excessive Heat, Pope

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Pope forecast zone
Reported by: Mesonet
Coordinates: 37.413, -88.562 (the zone’s center; the record gives no point)

Excessive Heat, Pulaski

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Pulaski forecast zone
Reported by: Mesonet
Coordinates: 37.223, -89.127 (the zone’s center; the record gives no point)

Excessive Heat, Saline

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Saline forecast zone
Reported by: Mesonet
Coordinates: 37.753, -88.541 (the zone’s center; the record gives no point)

Excessive Heat, Union

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Union forecast zone
Reported by: Mesonet
Coordinates: 37.471, -89.255 (the zone’s center; the record gives no point)

Excessive Heat, Wabash

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Wabash forecast zone
Reported by: Mesonet
Coordinates: 38.446, -87.844 (the zone’s center; the record gives no point)

Excessive Heat, Wayne

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Wayne forecast zone
Reported by: Mesonet
Coordinates: 38.430, -88.426 (the zone’s center; the record gives no point)

Excessive Heat, White

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: White forecast zone
Reported by: Mesonet
Coordinates: 38.088, -88.180 (the zone’s center; the record gives no point)

Excessive Heat, Williamson

When: July 5, 10:00 AM CST to 6:00 PM CST
Where: Williamson forecast zone
Reported by: Mesonet
Coordinates: 37.730, -88.930 (the zone’s center; the record gives no point)

What these are

Heat: Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.
Excessive Heat: Heat at or above the local excessive heat warning criteria, or heat that caused deaths.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Illinois in 2018 Every state in 2018 This day in weather history Warnings in Illinois, July 2018

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 770674, 770675, 770676, 770677, 770678, 770679, 770680, 770681, 770682, 770683, 770684, 770685, 770686, 770687, 770688, 770689, 770690, 770691, 770692, 770693, 770694, 770695, 770696, 770697, 770698, 770699, 770700, 770701, 770702, 770703, 770704, 770705, 770706, 770707, 770708, 770709, 770710, 770711.