Alert archive / Illinois / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 107, NWS Quad Cities, IA

July 27, 1997McDonough County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 27, 1997, 6:57 PM CDT for McDonough County, Illinois. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 27, 1997, 6:57 PM CDT (23:57 UTC)
Expired: Jul 27, 1997, 8:00 PM CDT
In force: 63 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County McDonough County, IL

The radar

The Lincoln radar (KILX), 119 km from the middle of the area, began a volume at 23:56 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 27, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 12.0 hours before the alert went out and 130 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: 2407 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1367 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 2:00 PM CDT, 4 hours 57 minutes earlier.

Area forecast discussion, Jul 27, 2:00 PM CDT, 4 hours 57 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
200 PM CDT SUN JUL 27 1997

SO FAR STORMS HAVE NOT POPPED SOUTH OF THE OUTFLOW/FRONT.  HOWEVER
STRONG/SVR STORM WITH RIGHT MOVEMNT&86 CELL BASED VIL APPROACHING
WESTERN PORTION OF CWA.  THIS STORM TRACKING ALONG BOUNDARY AND SO MAY
GET BUSY NEXT FEW HOURS.

MODELS ALL SHOW FRONT TO DROP SOUTH OF THE AREA WITH THE ETA IN A
BIGGER HURRY.  NGM AND AVN ARE SIMILAR AND SLOWER WITH FRONT KEEPING
SOME POPS INTO EARLY MONDAY MORNING I80 AND SOUTH.  BEST JET DYNAMICS
APROACH THE AREA LATE TONIGHT AND THERE4 THE BEST RAINS AFTER MIDNIGHT.

LIKELY POPS TONIGHT/POPS SOUTH OF I80 EARLY TOMORROW.  NEED MENTION OF
HVY RAIN OVERNIGHT.

CID 70/70   DBQ 66/70   MLI 71/70  BRL 73/70

HIRSCH

In the hours before

Special weather statement, Jul 27, 4:38 PM CDT, 2 hours 19 minutes before

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Special weather statement, Jul 27, 4:40 PM CDT, 2 hours 17 minutes before

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Special weather statement, Jul 27, 6:14 PM CDT, 43 minutes before

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Special weather statement, Jul 27, 6:15 PM CDT, 42 minutes before

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Local storm report, Jul 27, 6:50 PM CDT, 7 minutes before

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Local storm report, Jul 27, 6:54 PM CDT, 3 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 3:23 PM CDT	Severe Thunderstorm Warning	DVN	Iowa	62 min
Jul 27, 3:36 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	49 min
Jul 27, 3:43 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	62 min
Jul 27, 4:02 PM CDT	Tornado Warning	DVN	Cedar	58 min
Jul 27, 4:16 PM CDT	Tornado Warning	DVN	Scott	64 min
Jul 27, 4:22 PM CDT	Tornado Warning	DVN	Clinton	63 min
Jul 27, 4:51 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island, Whiteside	64 min
Jul 27, 5:08 PM CDT	Severe Thunderstorm Warning	DVN	Henry	62 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1997 Every severe thunderstorm warning in 1997

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.