Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 73, NWS Omaha, NE

July 25, 1990Montgomery County, Page County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 25, 1990, 7:50 PM CDT for Montgomery County, Page County, Iowa. It was in force for 40 min. 1 report 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
Jul 25, 1990, 7:50 PM CDT (00:50 UTC)
Expired
Jul 25, 1990, 8:30 PM CDT
In force
40 min
Issued by
NWS Omaha, NE
Area
Whole counties

Counties Montgomery County, IA, Page County, IA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Jul 25, 8:30 PM CDTTornado F0Montgomery, IA

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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.8 hours before the alert went out and 113 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 1990-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 1990-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3625 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 25, 4:01 PM CDT, 3 hours 49 minutes before
NEZ010-020-252230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA NE
345 PM CDT WED JUL 25 1990

...A FLASH FLOOD WATCH HAS BEEN POSTED FOR EAST CENTRAL AND PARTS
OF SOUTH CENTRAL NEBRASKA UNTIL MIDNIGHT...
...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SOUTHEAST NEBRASKA
UNTIL 9 PM CDT...

NUMEROUS THUNDERSTORMS WERE MOVING THOUGH EAST CENTRAL NEBRASKA AT
340 PM CDT.  THE STRONGEST THUNDERSTORMS WERE MOVING THROUGH EASTERN
CASS AND LANCASTER COUNTIES IN THE LINCOLN VICINITY 40 MILES SOUTHWEST
OF OMAHA.

THE THUNDERSTORMS WERE MOVING AT 25 MILES AN HOUR AND THEY SHOULD MOVE
INTO THE OMAHA VICINITY BY 5 PM CDT.  MORE STORMS WILL MOVE WILL MOVE
INTO SAUNDERS AND DODGE COUNTIES ABOUT 30 MILES WEST OF OMAHA.
^
BETWEEN 2 AND 4 INCHES OF RAIN HAD FALLEN IN PARTS OF SAUNDERS AND
DODGE COUNTIES DURING THE DAY.  ADDITIONAL HEAVY RAINFALL MAY PRODUCE
PRODUCE FLASH FLOODING IN THIS AREA.

IF YOU ARE IN THE PATH OF THE THUNDERSTORMS...BE PREPARED FOR VERY
HEAVY RAIN...DANGEROUS LIGHTNING...GUSTY WINDS AND POSSIBLY HAIL.
YOU SHOULD MOVE INTO A STRONG REINFORCED BUILDING UNTIL AFTER THE
STORMS PASS.

IF YOU LIVE IN FLOOD PRONE AREAS...PREPARE TO MOVE TO HIGHER GROUND
IF FL	OODING IS OBSEVERED OR IF A WARNING IS ISSUED.

JOHNSON
Special weather statement, Jul 25, 4:54 PM CDT, 2 hours 56 minutes before
NEZ010-015-252230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA NE
445 PM CDT WED JUL 25 1990

...A FLASH FLOOD WATCH HAS BEEN POSTED FOR EAST CENTRAL AND PARTS
OF SOUTH CENTRAL NEBRASKA UNTIL MIDNIGHT...
...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SOUTHEAST NEBRASKA
UNTIL 9 PM CDT...

AT 435 PM CDT THIS WEDNESDAY AFTERNOON A LINE OF HEAVIER THUNDERSTORMS
REACHED FROM ABOUT 20 MILES WEST OF LINCOLN NE ACROSS PLATTSMOUTH NE
ABOUT 25 MILES SOUTH OF OMAHA TO NEAR ATLANTIC IOWA ABOUT 40 MILES
EAST OF OMAHA NE.  THIS LINE IS DRIFTING ONLY SLOWLY NORTH AND THE
THUNDERSTORMS MOVE NORTHEAST ABOUT 20 MILES PER HOUR.  THE HEAVIEST
THUNDERSTORMS ARE LIKELY TO PRODUCE VERY HEAVY RAIN AND APPEAR TO BE
PRODUCING SOME HAIL THROUGHOUT EAST SEWARD...CENTRAL LANCASTER AND
CASS COUNTIES IN NEBRASKA AND NORTHERN MILLS AND POSSIBLY EASTERN
POTTAWATTAMIE COUNTIES IN IOWA.

RAPID FLOODING IS QUITE POSSIBLE FROM THE STORMS.  A FLASH FLOOD QWATCH
IS IN EFFECT FOR MUCH OF SOUTHEAST AND EAST CENTRAL NEBRASKA UNTIL
MIDNIGHT.  DO NOT ATTEMPT TO CROSS FLOWING WATER ON FOOT OR IN A
VEHICLE.

POWERS
Special weather statement, Jul 25, 5:47 PM CDT, 2 hours 3 minutes before
NEZ009-252330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORFOLK NE
540 PM CDT WED JUL 25 1990

AT 540 PM CDT RADAR INDICATED A LINE OF INTENSE THUNDERSTORMS STRETCHING
FROM 20 MILES SOUTH-SOUTHWEST OF NORFOLK NEAR HUMPHREY TO 15 MILES WEST
OF COLUMBUS NEAR GENOA.

THESE STORMS ARE LIKELY PRODUCING STRONG WIND...DANGEROUS LIGHTNING...
HEAVY RAIN AND SOME SMALL HAIL.

OTHER SHOWERS AND THUNDERSTORMS WERE WIDELY SCATTERED ACROSS PARTS OF
NORTH CENTRAL NEBRASKA BUT NONE OF THESE WERE VERY STRONG.
ALL THE SHOWERS AND THUNDERSTORMS ARE MOVING EAST-NORTHEAST AT 15 MPH.

REMEMBER TO TAKE COVER IMMEDIATELY IF THREATENING WEATHER APPROACHES.

KLEFFMAN
Special weather statement, Jul 25, 6:42 PM CDT, 1 hour 8 minutes before
NEZ009-260045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORFOLK NE
635 PM CDT WED JUL 25 1990

...FLASH FLOOD WATCH FOR PARTS OF NORTHEAST NEBRASKA UNTIL MIDNIGHT...

AT 635 PM CDT RADAR CONTINUED TO INDICATE STRONG THUNDERSTORMS EXTENDING
FROM 20 MILES NORTHWEST OF NORFOLK SOUTH TO NEAR COLUMBUS.  THESE STORMS ARE
LIKELY PRODUCING STRONG WIND...DANGEROUS LIGHTNING...AND HEAVY RAIN
AS THEY CONTINUE MOVING EAST-NORTHEAST AT 20 MPH.

IF YOU LIVE IN NORTHEAST NEBRASKA YOU SHOULD ALSO BE AWARE OF THE POSSIBILITY
OF FLOODING AS THUNDERSTORMS CONTINUE MOVING ACROSS ALREADY SATURATED GROUND
THROUGH THE EVENING HOURS.  ALSO REMEMBER TO NEVER DRIVE ACROSS FAST MOVING
WATER FOR IT ONLY TAKES A COUPLE OF INCHES OF WATER TO CAUSE HARM TO A
VEHICLE AND ITS OCCUPANTS.

KLEFFMAN
Special weather statement, Jul 25, 7:38 PM CDT, 12 minutes before
NEZ009-260130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORFOLK NE
730 PM CDT WED JUL 25 1990

...FLASH FLOOD WATCH FOR PARTS OF NORTHEAST NEBRASKA UNTIL MIDNIGHT...

AT 735 PM CDT RADAR CONTINUED TO INDICATE SHOWERS AND THUNDERSTORMS FROM
60 MILES NORTHEAST OF NORFOLK TO JUST WEST OF NORFOLK AND THEN FURTHER
SOUTHWEST INTO SOUTHCENTRAL NEBRASKA.  THE STRONGEST STORMS WHICH ARE
PRODUCING HEAVY RAIN...DANGEROUS LIGHTNING AND GUSTY WIND WERE LOCATED
EAST OF NORFOLK SOUTH INTO COLFAX COUNTY OR 15 MILES EAST OF COLUMBUS.

AS OF 7 PM CDT RAINFALL REPORTS ACROSS PLATTE AND COLFAX COUNTIES HAVE
BEEN GENERALLY IN THE 1 TO 2 IN RANGE.  HOWEVER THE POSSIBILITY OF FLOODING
WILL CONTINUE THROUGH THE REMAINDER OF THE EVENING HOURS AS SHOWERS AND
THUNDERSTORMS CONTINUE MOVING ACROSS THESE AREAS.

KLEFFMAN

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 25, 8:12 PM CDTFlash Flood WarningOAXSaline, Seward3 hr
Jul 25, 9:21 PM CDTFlash Flood WarningOAXLancaster3 hr
Jul 25, 9:59 PM CDTFlash Flood WarningOAXSaunders4 hr
Jul 25, 9:23 PM CDTFlash Flood WarningOAXFremont, Mills, Montgomery, Page4 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 1990Every severe thunderstorm warning in 1990

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.