Flash Flood Warning 24, NWS Des Moines, IA

IAZALL-302000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1230 PM CDT SAT JUN 30 1990

...DANGEROUS HEAT AND HUMIDITY LEVELS OVER IOWA...

A POTENTIALLY DANGEROUS COMBINATION OF HEAT AND HUMIDITY IS BUILDING
OVER IOWA THIS AFTERNOON.  WHILE THE LAST FEW DAYS HAVE ALSO BEEN HOT
AND HUMID...CONDITIONS WILL BE FAR WORSE IN MOST AREAS THIS AFTERNOON.

ALREADY AT 12 NOON...TEMPERATURES IN THE STATE WERE HOVERING AROUND
THE 90 DEGREE MARK...WITH DEWPOINTS IN THE MIDDLE 70S.  THE HEAT INDEX..
WHICH IS A MEASURE OF THE COMBINED EFFECTS OF HEAT AND HUMIDITY...
WAS ALREADY AROUND THE 100 DEGREE MARK IN MANY AREAS.

AN ADDED STRESS IS BEING CAUSED BY A LACK OF WIND...AS SPEEDS THROUGHOUT
THE STATE WERE UNDER 10 MILES AN HOUR.

CONDITIONS WILL ONLY WORSEN DURING THE AFTERNOON...AS TEMPERATURES
CLIMB SLOWLY.

REMEMBER...IN THIS WEATHER YOU SHOULD SLOW DOWN AND TAKE IT EASY.
STRENOUS ACTIVITY CAN BE VERY DANGEROUS...ESPECIALLY FOR THOSE WHO ARE
NOT IN TOP PHYSICAL CONDITION.  IF WORKING OUTDOORS...TAKE FREQUENT
BREAKS...DRINK PLENTY OF NON-ALCOHOLIC BEVERAGES...AND TRY TO STAY OUT
OF THE DIRECT SUN.  IF POSSIBLE...TAKE ADVANTAGE OF AIR CONDITIONING.

THE LEAST SEVERE CONDITIONS WILL BE OVER THE NORTHWEST COUNTIES...AS
HUMIDITY LEVELS WILL BE SLIGHTLY LESS THAN ELSEWHERE IN THE STATE.
HOWEVER...TEMPERATURES IN THE NORTHWEST WILL STILL BE WELL INTO THE 90S.

TRUETT

IAZALL-301800-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1230 AM CDT SAT JUN 30 1990

TO USERS OF IAWAS...

STATE RADIO CALLED AND STATED THAT THE PROBLEM WITH IAWAS IS BEING
WORKED ON BUT THEY DO NOT KNOW HOW LONG THEY IT WILL BE. PLEASE
PAY ATTENTION TO YOUR WIRES IN THE EVENT THAT SEVERE THUNDERSTORM
OR TORNADO WATCHES ARE ISSUED FROM THE NATIOMAL WEATHER SERVICE
AT OMAHA...DES MOINES...WATERLOO...MOLINE...DUBUQUE OR SIOUX CITY.

WEINBRECHT

IAZALL-301830-

SPECIAL STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1249 PM CDT SAT JUN 30 1990

AT 1235 PM...INTENSE THUNDERSTORMS PERSISTED ALONG THE IOWA/MISSOURI
BORDER OVER EXTREME SOUTHEAST IOWA. THE STRONGEST STORM IN IOWA WAS
LOCATED IN DAVIS COUNTY ABOUT 5 MILES EAST OF BLOOMFIELD OR ABOUT 20
MILES SOUTHEAST OF OTTUMWA.

THIS STORM WILL PRODUCE VERY HEAVY RAIN...FREQUENT DEADLY LIGHTNING AND
POSSIBLY SOME HAIL.

ISOLATED THUNDERSTORMS HAD DEVELOPED IN SOUTHWEST IOWA SOME 70 TO 85
MILES SOUTHWEST OF DES MOINES...JUST WEST OF VILLISCA AND 5 MILES
SOUTHEAST OF SHENANDOAH.

THE THUNDERSTORM OVER CENTRAL IOWA NORTH OF DES MOINES HAD DISSIPATED.

THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR.

BARLOW

IAZALL-301930-

SPECIAL STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
145 PM CDT SAT JUN 30 1990

AT 132 PM CDT...INTENSE THUNDERSTORMS PERSISTED ALONG THE IOWA/
MISSOURI BORDER OVER EXTREME SOUTHEAST IOWA.  THE STRONGEST STORMS
WERE LOCATED OVER SOUTHERN DAVIS AND SOUTHERN VAN BUREN COUNTIES...
OR ABOUT 20 THROUGH 35 MILES SOUTHEAST OF OTTUMWA.

THESE STORMS HAVE BEEN PRODUCING EXTREMELY LARGE AMOUNTS OF RAIN...
FREQUENT DANGEROUS LIGHTNING...AND COULD ALSO PRODUCE SOME HAIL AND
POSSIBLY BRIEF STRONG GUSTY WIND.

PEOPLE IN THE PATH OF THESE STORMS IN EXTREME SOUTHEAST IOWA SHOULD
BE PREPARED TO SEEK SHELTER IMMEDIATELY SHOULD THREATENING WEATHER
APPROACH...AND IF NECESSARY BE PREPARED TO MOVE TO A HIGHER GROUND.

OVER EXTREME SOUTHWEST IOWA...WIDELY SCATTERED THUNDERSTORMS CONTINUED
TO DEVELOP.

THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 20 TO 25 MILES AN HOUR.

CAB/WPM

IAZALL-302030-

SPECIAL STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
250 PM CDT SAT JUN 30 1990

...SEVERE THUNDERSTORM WATCH FOR THE SOUTHERN HALF OF IOWA UNTIL
10PM...

AT 235 PM CDT...A NARROW BAND OF VERY STRONG THUNDERSTORMS HAD
RAPIDLY DEVELOPED FROM CENTRAL INTO SOUTHEAST IOWA. THE STORMS
WERE LOCATED FROM DES MOINES SOUTHEAST TO FARMINGTON...OR ABOUT
25 MILES SOUTHWEST OF BURLINGTON. ANOTHER VERY STRONG STORM WAS
LOCATED 20 MILES NORTHEAST OF OTTUMWA...NEAR SIGOURNEY.

VERY HEAVY RAINS HAVE BEEN OCCURRING WITH THESE STORMS NEARLY 11/4
INCHES OF RAIN HAS FALLEN IN THE DES MOINES AREA FROM 2 TO 230PM.

ALONG WITH THE VERY HEAVY RAIN...FREQUENT DEADLY LIGHTNING AND SMALL
HAIL CAN BE EXPECTED WITH THESE STORMS.
THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 20 TO 25 MILES AN HOUR.

BARLOW

IAZALL-302230-

SPECIAL STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
438 PM CDT SAT JUN 30 1990

...SEVERE THUNDERSTORM WATCH FOR THE SOUTHERN HALF OF IOWA UNTIL
10PM...

AT 225 PM CDT...AN AREA OF SEVERE AND INTENSE THUNDESTORMS WERE WAS
OVER MAINLY SOUTH CENTRAL AND PARTS OF SOUTHEAST IOWA.  THE AREA WAS
GENRALLY SOUTH OF A LINE FROM SOUTHWEST MADISON COUNTY...30 MILES
SOUTHWEST OF DES MOINES...TO JUST SOUTH OF NEW SHARON...45 MILES
EAST OF DES MOINES.  THE SOUTH END OF THE AREA EXTENDED FROM NEAR
CRESTON...40 MILES SOUTHWEST OF DES MOINES....TO 10 MILES NORTHEAST
OF LAMONI...AND TO NEAR RATHBUN RESERVOIR.

THE STORMS WILL LIKELY PRODUCE EXTREMELY HEAVY RAINFALL...LARGE
AND DAMAGING HAIL...DAMAGING WIND AND DEADLY CLOUD TO GROUND LIGHTNING.
PERSONS IN THE OSCEOLA...HUMESTON...OSKALOOSA...EDDYVILLE AND CORYDON
AREAS SHOULD BE ESPECIALLY ALERT TO POSSIBLE SEVERE WEATHER.

THE SHOWERS AND THUNDERSTORMS WERE MOVmING SOUTH AT 25 MILES AN HOUR.

HUTTON