Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS Lincoln, IL

May 20, 2017Effingham County, Illinois

NWS Lincoln, IL issued this special weather statement at May 20, 2017, 2:29 AM CDT for Effingham County, Illinois. It was in force for 46 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: May 20, 2017, 2:29 AM CDT (07:29 UTC)
Expired: May 20, 2017, 3:15 AM CDT
In force: 46 min
Issued by: NWS Lincoln, IL

County Effingham County, IL

The radar

The Lincoln radar (KILX), 107 km from the middle of the area, began a volume at 07:31 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

Lincoln, IL (KILX), launched 00:00Z, 7.5 hours before the alert went out and 89 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 603 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 65 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 Lincoln, IL wrote its last area forecast discussion before this special weather statement went out at May 20, 12:50 AM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, May 20, 12:50 AM CDT, 1 hour 39 minutes before

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Hazardous weather outlook, May 19, 3:03 PM CDT, 11 hours 26 minutes before

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In the hours before

Special weather statement, May 20, 2:29 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Lincoln IL
229 AM CDT SAT MAY 20 2017

ILZ061-066-200815-
Effingham-Shelby-
229 AM CDT SAT MAY 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SHELBY AND CENTRAL
EFFINGHAM COUNTIES UNTIL 315 AM CDT...

At 229 AM CDT, Doppler radar was tracking a strong thunderstorm near
Altamont, or near Effingham, moving north at 35 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Effingham, Altamont, Teutopolis, Watson, Windsor, Stewardson,
Findlay, Shumway, Moccasin, Strasburg, Clarksburg, Sigel, Trowbridge,
Wolf Creek State Park, Mode, Heartville, Lake Sara, Eagle Creek State
Park, Effingham County Airport and Altamont Reservoir.

This includes the following highways...
 Interstate 57 between mile markers 149 and 172.
 Interstate 70 between mile markers 81 and 98.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3900 8877 3954 8875 3954 8872 3952 8871
      3952 8864 3951 8864 3947 8858 3945 8858
      3945 8847 3924 8847 3897 8854
TIME...MOT...LOC 0729Z 187DEG 29KT 3908 8865

Bak

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 7:28 AM CDT	Flash Flood Watch	ILX	Sangamon	35 hr

Nearby

Special Weather Statements in Illinois, 2017 Every special weather statement in 2017

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.