Alert archive / Iowa / Flash Flood Warnings in 1993

Flash Flood Warning 22, NWS Omaha, NE

July 8, 1993Shelby County, Iowa

NWS Omaha, NE issued this flash flood warning at Jul 8, 1993, 9:07 PM CDT for Shelby County, Iowa. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Jul 8, 1993, 9:07 PM CDT (02:07 UTC)
Expired: Jul 9, 1993, 1:15 AM CDT
In force: 4 hr
Issued by: NWS Omaha, NE
Area: Whole counties

County Shelby County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.1 hours before the alert went out and 97 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3257 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 341 m²/s²
Significant tornado parameter: 6.3
Supercell composite: 27.6

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 flash flood 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 8, 5:10 PM CDT, 3 hours 57 minutes before

NEZ003-004-007>009-082330-

SPECIAL WEATHER STATEMENT...CORRECT HEADLINE
NATIONAL WEATHER SERVICE NORFOLK NE
510 PM CDT THU JUL 8 1993

...SHOWERS AND A FEW THUNDERSTORMS ARE DEVELOPING OVER NORTHEAST NEBRASKA...

AT 5 PM CDT...RADAR WAS SHOWING AN AREA OF SHOWERS AND A FEW
THUNDERSTORMS GENERALLY EAST OF A LINE FROM YANKTON TO 20 MILES
SOUTHWEST OF NORFOLK TO COLUMBUS.  THE STRONGEST STORMS WERE LOCATED
ABOUT 10 MILES NORTH OF HOWELLS OR 25 MILES SOUTHEAST OF NORFOLK AND
JUST NORTH OF NEWMAN GROVE OR 25 MILE SOUTHWEST OF NORFOLK.  THE STORMS
ARE MOVING EAST AT 25 TO 30 MPH.

THESE STORMS WILL PRODUCE BRIEF HEAVY RAIN AND WITH EXTREMELY SATURATED
GROUND CONDITIONS...AREAS OF LOWLAND FLOODING ARE QUITE POSSIBLE.  IF
YOU LIVE IN A FLOOD PRONE AREA...BE ALERT FOR FLOODING AND MOVE TO
HIGHER GROUND.  DO NOT ATTEMPT TO DRIVE ACROSS RUNNING WATER.

MML

Special weather statement, Jul 8, 5:13 PM CDT, 3 hours 54 minutes before

NEZ003-004-007>009-082330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORFOLK NE
510 PM CDT THU JUL 8 1993

...SHOWERS AND A FEW THUNDERSTORM AREA DEVELOPING OVER NORTHEAST NEBRASKA...

AT 5 PM CDT...RADAR WAS SHOWING AN AREA OF SHOWERS AND A FEW
THUNDERSTORMS GENERALLY EAST OF A LINE FROM YANKTON TO 20 MILES
SOUTHWEST OF NORFOLK TO COLUMBUS.  THE STRONGEST STORMS WERE LOCATED
ABOUT 10 MILES NORTH OF HOWELLS OR 25 MILES SOUTHEAST OF NORFOLK AND
JUST NORTH OF NEWMAN GROVE OR 25 MILE SOUTHWEST OF NORFOLK.  THE STORMS
ARE MOVING EAST AT 25 TO 30 MPH.

THESE STORMS WILL PRODUCE BRIEF HEAVY RAIN AND WITH EXTREMELY SATURATED
GROUND CONDITIONS...AREAS OF LOWLAND FLOODING ARE QUITE POSSIBLrE.  IF
YOU LIVE IN A FLOOD PRONE AREA...BE ALERT FOR FLOODING AND MOVE TO
HIGHER GROUND.  DO NOT ATTEMPT TO DRIVE ACROSS RUNNING WATER.

MML

Special weather statement, Jul 8, 5:14 PM CDT, 3 hours 53 minutes before

NEZ003-004-007>009-082330-

SPECIAL WEATHER STATEMENT...CORRECT HEADLINE
NATIONAL WEATHER SERVICE NORFOLK NE
510 PM CDT THU JUL 8 1993

...SHOWERS AND A FEW THUNDERSTORMS ARE DEVELOPING OVER NORTHEAST NEBRASKA...

AT 5 PM CDT...RADAR WAS SHOWING AN AREA OF SHOWERS AND A FEW
THUNDERSTORMS GENERALLY EAST OF A LINE FROM YANKTON TO 20 MILES
SOUTHWEST OF NORFOLK TO COLUMBUS.  THE STRONGEST STORMS WERE LOCATED
ABOUT 10 MILES NORTH OF HOWELLS OR 25 MILES SOUTHEAST OF NORFOLK AND
JUST NORTH OF NEWMAN GROVE OR 25 MILE SOUTHWEST OF NORFOLK.  THE STORMS
ARE MOVING EAST AT 25 TO 30 MPH.

THESE STORMS WILL PRODUCE BRIEF HEAVY RAIN AND WITH EXTREMELY SATURATED
GROUND CONDITIONS...AREAS OF LOWLAND FLOvODING ARE QUITE POSSIBLE.  IF
YOU LIVE IN A FLOOD PRONE AREA...BE ALERT FOR FLOODING AND MOVE TO
HIGHER GROUND.  DO NOT ATTEMPT TO DRIVE ACROSS RUNNING WATER.

MML

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:33 PM CDT	Flash Flood Warning	OAX	Burt, Dodge	9 hr
Jul 8, 9:56 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline, Seward	49 min
Jul 8, 9:56 PM CDT	Severe Thunderstorm Warning	OAX	Butler	49 min
Jul 8, 10:08 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster	52 min
Jul 8, 10:23 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe, Sarpy, Saunders	52 min
Jul 8, 10:23 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	52 min
Jul 8, 10:34 PM CDT	Severe Thunderstorm Warning	OAX	Dodge	41 min
Jul 8, 10:51 PM CDT	Severe Thunderstorm Warning	OAX	Washington	69 min
Jul 8, 11:03 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster	27 min
Jul 8, 11:33 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Lancaster	42 min
Jul 8, 10:49 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Pottawattamie	56 min
Jul 8, 10:49 PM CDT	Severe Thunderstorm Warning	OAX	Fremont	56 min
Jul 8, 11:01 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie	44 min
Jul 8, 11:15 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	60 min
Jul 8, 11:27 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Page	48 min

Nearby

Flash Flood Warnings in Iowa, 1993 Every flash flood warning in 1993

Sources

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.