Severe Thunderstorm Warning 37, NWS Quad Cities, IA

Issued

May 2, 1998, 5:15 PM CDT (22:15 UTC)

Expired

May 2, 1998, 6:15 PM CDT

In force

60 min

Issued by

NWS Quad Cities, IA

Area

Whole counties

County Henderson County, IL

The Quad Cities radar (KDVN), 93 km from the middle of the area, began a volume at 22:15 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.

172 
WUUS1 KMLI 022216 RRA
SVRMLI
ILC071-022315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
515 PM CDT SAT MAY 2 1998

THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HENDERSON COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 615 PM CDT

* AT 512 PM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 9
  MILES SOUTHEAST OF BURLINGTON OR 1 MILE SOUTH OF DECORRA MOVING
  NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR
  DECORRA                                    AROUND 518 PM CDT
  HOPPER                                     AROUND 520 PM CDT
  OLENA                                      AROUND 521 PM CDT
  STRONGHURST                                AROUND 525 PM CDT
  RARITAN                                    AROUND 525 PM CDT

THIS STORM HAS A HIGH PROBABILITY OF LARGE HAIL. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

JDH

NWS Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 2, 1:45 PM CDT, 3 hours 30 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
145 PM CDT SAT MAY 2 1998

THE 18Z SURFACE ANALYSIS SHOWED A TROUGH DRAPED THROUGH THE MIDWEST
FROM CENTRAL LAKE MI TO KMSN TO KSQI TO KUIN TO OK. A WEAK BAND OF
SHRA IS NOTED ALONG THE TROUGH. AIR AHEAD OF THE TROUGH PER ADAP/ADAS
IS WEAKLY UNSTABLE WITH CAPES AROUND 500J/KG. BEHIND THE FRONT AT
LEAST AT THE SURFACE THINGS HAVE STABILIZED. COLD POOL ALOFT OVER
WESTERN IA IS ASSISTING CONVECTIVE ACTIVITY OUT THERE. IT APPEARS THAT
UNTIL THE COLD POOL MOVES INTO EASTERN IA...TSRA ACTIVITY WILL BE
LIMITED THIS AFTERNOON. TONIGHT/S CONCERN IS PRECIPITATION.

THE 12Z ETA/NGM/AVN INITIALIZED ALRIGHT AND AT 18Z REPRESENTED
REALITY. THE STRONG UPPER LOW WILL MOVE INTO SOUTHERN IL BY MORNING.
-25C AIR ALOFT WILL MAKE THE 850-500MB LAPSE RATE CONDITIONALLY
UNSTABLE. Q-VECTOR CONVERGENCE IS NOTED OVER EASTERN IOWA AROUND 00Z
WHICH SHOULD HELP CONVECTIVE ELEMENTS...ALSO IN THE LEFT EXIT REGION
OF A 75KT UPPER LEVEL JET ROTATING AROUND THE LOW. WITH THE LOSS OF
SOLAR INSOLATION AROUND 800 PM...ACTIVITY WILL BE ON THE WANE WITH
WRAP AROUND PRECIPITATION IN THE DEFORMATION ZONE MAINLY NORTH OF
KAWG-KGBG EXPECTED. THIS AGREES WITH MODEL UPSIDENCE AND QPF DATA.
SURFACE TRAJECTORIES ARE IN GOOD AGREEMENT WITH FWC/FAN GUIDANCE AND
WILL GENERALLY FOLLOW.

THE CURRENT ZONE FORECAST IS IN PRETTY GOOD SHAPE WITH THE ADDITION OF
SOME STORMINESS IN EASTERN IA AND EXTENDED POPS NORTH OF KAWG-KGBG
INTO THE OVERNIGHT HOURS.

CID 46/60   DBQ 49/60   MLI 47/50   BRL 51/40

HELGESON

Severe Thunderstorm Warnings in Illinois, 1998Every severe thunderstorm warning in 1998

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.