Severe Thunderstorm Warning 140, NWS Quad Cities, IA

Issued

Aug 9, 2000, 1:14 AM CDT (06:14 UTC)

Expired

Aug 9, 2000, 2:00 AM CDT

In force

46 min

Issued by

NWS Quad Cities, IA

Area

Whole counties; the outline is the Mesonet’s reconstruction

County Iowa County, IA

The Quad Cities radar (KDVN), 127 km from the middle of the area, began a volume at 06:13 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.

000 
WUUS53 KDVN 090616
SVRMLI
IAC095-090700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
114 AM CDT WED AUG 9 2000

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  IOWA COUNTY IN EAST CENTRAL IOWA

* UNTIL 200 AM CDT

* AT 108 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS 9
  MILES WEST OF LADORA...OR 5 MILES NORTHEAST OF BROOKLYN...MOVING
  EAST AT 35 MPH.

* THE LINE OF SEVERE THUNDERSTORMS WILL BE NEAR...
   LADORA BY 120 AM CDT.
   GENOA BLUFF BY 125 AM CDT.
   MARENGO BY 130 AM CDT.
   CONROY...WILLIAMSBURG BY 135 AM CDT.

THESE SEVERE THUNDERSTORMS ARE CAPABLE OF PRODUCING HAIL UP TO 1 INCH
IN DIAMETER...WINDS IN EXCESS OF 55 MPH...AND VERY HEAVY RAIN. TAKE 
COVER IN A STURDY STRUCTURE UNTIL THESE STORMS PASS.

INTENSE LIGHTNING IS OCCURRING WITH THESE STORMS. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

THESE SEVERE THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL...
WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES.
AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE
WASHED OUT.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN THE QUAD CITIES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 AM CDT
WEDNESDAY MORNING FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS.

LAT...LON 4187 9226 4155 9228 4154 9185 4183 9187

JAZ

NWS Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 8, 2:40 PM CDT, 10 hours 34 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
240 PM CDT TUE AUG 8 2000

WHAT LITTLE SFC OBS AVAILABLE AT 18Z CONTINUES TO SHOW A WARM
FRONT/OUTFLOW BOUNDARY ACROSS WESTERN AND SOUTHERN MO.  GOOD THERMAL
GRADIENT ACROSS BOUNDARY WITH 90S TO AROUND 100 OVER ERN KS AND
NORTHERN AR. ANOTHER SFC TROF EXTENDS FROM CENTRAL NE NORTH INTO WRN MN.
UPPER AIR FEATURES THIS MORNING SHOWED A BROAD TROF FROM THE NRN
ROCKIES THROUGH THE MID MISSISSIPPI VALLEY. A SPEED MAX WAS EVIDENT
MOVING THROUGH NE MT AT 12Z. NOT MUCH TO SPEAK OF IN THE WAY OF
CONVECTIVE DEVELOPMENT YET THIS AFTERNOON.  BEST LOW LVL CONVERGENCE
AND INSTBILITY VICINTY OF SURFACE BOUNDARY OVR WRN IA/ERN NE.
HOWEVER...AREA APPEARS TO BE CAPPED BASED MORNING 700 TEMPS AROUND +13.
MODELS HANDLE BROAD SCALE FEATURES SIMILARLY THE NEXT FEW DAYS...BUT
DIFFER SIGNIFICANTLY IN THE DETAILS.  QPF OUTPUT IS ALL OVER THE
PLACE...ESPECIALLY THROUGH 24 HOURS.  NGM APPEARED HAVE THE BEST
OVERALL HANDLE ON QPF THROUGH 18Z...ESPECIALLY ACROSS ILLINOIS AND
EASTERN MISSOURI AND WILL LEAN TOWARD ITS SOLUTIONS FOR THIS
FORECAST. BELIEVE MOST LIKELY AREA FOR DEVELOPMENT WILL BE FROM
EASTERN IOWA INTO NRN HALF OF ILLINOIS.  WESTERLY 850 FLOW THIS
AFTERNOON AND EVENING SHOULD GET SOME LIFT FROM COOLER AIRMASS OVER
EASTERN IA.  THIS LIFT SHOULD BE ENHANCED THIS EVENING AS S/W /
SPEEDMAX DROPS SOUTHEAST OUT OF THE NORTHERN PLAINS.  WILL GO WITH LOW
CHANCE POPS WEST OF THE MS RIVER AND HIGH CHC POPS OVER IL.  LOOKS
LIKE MOST OF THE ACTIVITY WILL BE DURING THE EVENING HOURS.  AFTER
TONIGHT...E/W FRONTAL BOUNDARY THAT SETS UP OVER SOUTHERN IA/CENTRAL
IL WED WILL DRIFT SLOWLY SOUTH AS HIGH PRESSURE BUILDS TO THE NORTH.
MODELS HINT AT A WEAK S/W MOVING SOUTHEAST ALONG THE BOUNDARY WED
AFTERNOON/EVENING AND WILL INCLUDE LOW CHC POPS SOUTH TO ACCOUNT FOR
THIS FEATURE. WILL GO WITH DRY FCST TO THE NORTH.  COOLER AIR SURGES
SOUTH WEDNESDAY NIGHT AND SHOULD END THREAT OF PCPN FOR THE REMAINDER
OF THE WEEK.

WITH HUMID AIRMASS STILL IN PLACE TONIGHT WARM MINS DEPICTED IN THE
FAN/FWC NUMBERS LOOK REASONABLE.  AFTER TONIGHT IT LOOKS LIKE FWC
MAXES ARE ON THE HIGH SIDE.  WILL UNDERCUT FWC HIGHS ON WED A DEGREE
OR TWO THEN GO CLOSER TO COOLER FAN FOR HIGHS ON THURSDAY.  OVERNIGHT
LOWS SIMILAR ON BOTH MODELS AND LOOK REASONABLE.

IN THE EXTENDED...LONG RANGE MODELS KEEP CWA IN EAST TO SOUTHEAST LOW
LEVEL FLOW OFF HIGH PRESSURE MOVING SOUTH THROUGH THE GREAT LAKES INTO
THE OHIO VALLEY.  WILL CONTINUE THE DRY AND A LITTLE COOLER THAN
NORMAL TREND INTO SUNDAY.

.DVN...
IA...NONE.
IL...NONE.
MO...NONE.

DLF

Severe Thunderstorm Warnings in Iowa, 2000Every severe thunderstorm warning in 2000

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.