Flash Flood Warning 9, NWS Quad Cities, IA

AREA FORECAST DISCUSSION...CORRECTION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
215 AM CDT MON MAY 27 1996

FLOODING... STRONG GRADIENT WINDS AND SEVERE THREAT CONCERNS TODAY.
CELLS TRAINING ALONG 85H THETA-E GRADIENT ACROSS SOUTHERN IOWA AND
NORTHERN MISSOURI INTO CENTRAL ILLINOIS. URBAN AND SMALL STREAM
ADVISORIES IN EFFECT FOR HANCOCK AND LEE CO'S. MCDONOUGH COUNTY
UPGRADED TO FLASH FLOOD WARNING. KDVN 88-D ESTIMATES BETWEEN 1.5 TO 4.0
INCHES OF RAINFALL IN THESE AREAS DURING PAST 18 HRS. GRAVITY WAVE
APPARENTLY CAUSING STRONG GRADIENT WINDS IN WAKE OF THUNDERSTORMS IN
EAST CENTRAL IOWA ATTM. WIND DAMAGE REPORTED IN DES MOINES. SAME
SITUATION OCCURRED THE OTHER DAY (THURS) WITH BAROGRAPH DEPICTING AN
ABRUPT PRESSURE FALL/RISE. SVR THREAT MODERATE TODAY ACROSS SE IOWA AS
PER NEW SWODY1 (94O). PLETHORA OF SVR PARAMETERS COMING TOGETHER IN
THAT AREA BY MIDDAY.

06Z MAPS SHOWED 998 MB LOW WEST OF BIE ALONG KS/OK BORDER... NORTH OF
6HR POSITION OF NGM. OCCLUDED/WARM FRONT STRETCHED EAST FROM LOW ALONG
I-70 CORRIDOR BETWEEN MCI-STL. PRESSURE FALLS ON THE SCALE OF 3MB/HR
EVIDENT ACRS SOUTHEAST NE. LOW APPEARS HEADED IN THIS DIRECTION. 85H
THETA-E MAXIMUM NEAR MCI ATTM AS PER 03Z RUC WITH GRADIENT EXTENDING
EASTWARD THROUGH IRK-UIN-PIA. 40 KT 85H JET TRANSPORTING +14 C TD'S
OVER WARM FRONT. REGIONAL RADAR COMPOSITE INDICATED TRAINING OF CELLS
ALONG GRADIENT. CELL IN WESTERN HANCOCK CO DUMPED 1.5 INCHES IN ONE
HOUR.

PROFILIER SHOWED 80KT MID LEVEL SPEED MAX RACING THROUGH EASTERN KS/OK.
UPPER DIVERGENCE IMPRESSIVE ACRS EASTERN NE ON NOSE OF MID LEVEL JET.
ETA/NGM MOVE MID LEVEL JET AXIS EASTWARD BY AFTERNOON WITH SE IOWA...
WEST CENTRAL ILLINOIS IN FAVORABLE LFQ. INSTABILITY... HELICITY AND
IMPRESSIVE Q-G FORCING (UVV'S) SUPPORT SELS MODERATE DAY 1 OUTLOOK.

THINGS TO QUIET DOWN BY EVENING IT APPEARS AS MID LEVEL SPEED MAX
SLIDES EAST INTO SOUTHERN GREAT LAKES. "GRUNGE" (LOW CIGS/FOG) AND SCT
RW- TO PERSIST HOWEVER THRU TUESDAY AFTERNOON UNDERNEATH UPPER SYSTEM.
UPPER LOW TO PHASE WITH UPPER LOW OVER EASTERN CANADA LATE TUES...
BRINGING TO AN END THE PCPN.

RECOMMEND FLASH FLOOD WATCH ALONG AND SOUTH OF I-80 TODAY.

CID 061/++  DBQ 057/++  MLI 063/++  BRL 067/++

HENDRICKS

IAZ099-ILZ034-035-270815-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
108 AM CDT MON MAY 27 1996

...URBAN AND SMALL STREAM FLOOD ADVISORIES CONTINUE FOR LEE COUNTY IN
IOWA AND HANCOCK AND MCDONOUGH COUNTIES UNTIL 300 AM THIS MONDAY
WARNING...

AT 105 AM...NWS DOPPLER RADAR CONTINUES TO INDICATED STRONG
THUNDERSTORMS OVER THE ABOVE MENTIONED COUNTIES WITH TORRENTIAL RAIN...
FREQUENT DEADLY LIGHTNING AND SOME GUSTY WIND.  RAINFALL RATES
OF AN INCH PER HOUR WILL BE COMMON WITH THESE THUNDERSTORMS. PERSONS
WHO LIVE IN LOW LYING AREAS OR FLOOD PRONE AREAS SHOULD BE PREPARED TO
MOVE TO HIGHER GROUND IF FLOODING IS OBSERVED.

PERSONS OUT DRIVING TONIGHT SHOULD NOT D~RIVE INTO AREAS WHERE WATER
COVERS THE ROADS AS ONLY WATER A FOOT DEEP CAN SWEEP A CAR OFF THE ROAD.

HOLSTEN

IAZ099-ILZ034-270800-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
202 AM CDT MON MAY 27 1996

...URBAN AND SMALL STREAM FLOOD ADVISORY CONTINUES FOR LEE COUNTY IN
IOWA AND HANCOCK COUNTY IN ILLINOIS UNTIL 300 AM...

AT 200 AM...DOPPLER RADAR CONTINUED TO INDICATED THUNDERSTORMS WITH
TORRENTIAL RAINS EXTENDING IN A LINE FROM BURLINGTON TO FORT MADISON TO
KEOKUK TO KIRKSVILLE.  THESE STORMS ARE MOVING TO THE NORTHEAST AT 25
MILES AN HOUR AND WILL DROP ADDITIONAL HEAVY RAIN THROUGH 300 AM. ONE
TO THREE INCHES OF RAIN HAS ALREADY FALLEN SINCE 1100 PM. PERSONS WHO
LIVE ALONG SMALL STREAMS SHOULD BE PREPARED TO MOVE TO HIGHER GROUND.

PERSONS DRIVING THIS MORNING SHO|ULD NOT ATTEMPT TO CROSS FLOODED ROADS!

HOLSTEN