Alert archive / Illinois / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 13, NWS Quad Cities, IA

April 5, 1997Stephenson County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 5, 1997, 4:15 PM CST for Stephenson County, Illinois. It was in force for 45 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 5, 1997, 4:15 PM CST (22:15 UTC)
Expired: Apr 5, 1997, 5:00 PM CST
In force: 45 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Stephenson County, IL

What was reported inside it

Time	Report	Where	Remark
Apr 5, 4:36 PM CST	Thunderstorm Wind 52	Freeport, IL
Apr 5, 4:36 PM CST	Thunderstorm Wind 50	Lena, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 5, 4:15 PM CST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 107 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: 515 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMLI 052216 RRA
SVRMLI
ILC177-052300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
415 PM CST SAT APR 5 1997

* SEVERE THUNDERSTORM WARNING FOR
  STEPHENSON COUNTY - NORTH CENTRAL ILLINOIS

* UNTIL 500 PM CST
 
* SOME LOCATIONS AFFECTED

  PEARL CITY
  FREEPORT
  RED OAK
  ROCK CITY

* AT 413 PM CST RADAR INDICATED SEVERE THUNDERSTORMS EXTENDING
  FROM 20 MILES SOUTH OF FREEPORT TO 15 MILES SOUTHEAST OF DUBUQUE
  MOVING NORTHEAST AT 45 MILES AN HOUR.

* THE STORMS WILL BE NEAR PEARL CITY BY 430 PM...FREEPORT BY 440
  PM...RED OAK BY 445 PM...AND ROCK CITY BY 455 PM.

THESE ARE DANGEROUS STORMS WITH A HISTORY OF DAMAGING WINDS.  IF
YOU :ARE IN THEIR PATH...TAKE SHELTER IMMEDIATELY.

MJB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 2:03 PM CST	Severe Thunderstorm Warning	DVN	Henderson	47 min
Apr 5, 2:23 PM CST	Severe Thunderstorm Warning	DVN	Mercer, Warren	42 min
Apr 5, 2:56 PM CST	Severe Thunderstorm Warning	DVN	Rock Island	44 min
Apr 5, 3:28 PM CST	Severe Thunderstorm Warning	DVN	Henry, Whiteside	47 min
Apr 5, 3:48 PM CST	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess	42 min
Apr 5, 3:53 PM CST	Severe Thunderstorm Warning	DVN	Bureau, Putnam	47 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.