Alert archive / Iowa / Flash Flood Warnings in 1987

Flash Flood Warning 5, NWS Omaha, NE

July 9, 1987Mills County, Montgomery County, Iowa

NWS Omaha, NE issued this flash flood warning at Jul 9, 1987, 4:26 AM CDT for Mills County, Montgomery County, Iowa. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Jul 9, 1987, 4:26 AM CDT (09:26 UTC)
Expired: Jul 9, 1987, 8:30 AM CDT
In force: 4 hr
Issued by: NWS Omaha, NE
Area: Whole counties

Counties Mills County, IA, Montgomery County, IA

The radar

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 9.4 hours before the alert went out and 88 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3603 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 145 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 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, 10:56 PM CDT, 5 hours 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA NE
1050 PM CDT WED JUL 8 1987

AT 1050 PM CDT WIDELY SCATTERED THUNDERSTORMS HAD DEVELOPED ACROSS
EXTREME SOUTHEAST NEBRASKA...AND CONTINUED IN BURT COUNTY OF EAST
CENTRAL NEBRASKA.

A VERY INTENSE THUNDERSTORM WAS LOCATED IN EXTREME NORTHERN NEMAHA
COUNTY OF SOUTHEAST NEBRASKA.  THE STORM WAS 30 MILES NORTHWEST OF FALLS
CITY.  THIS STORM WILL PRODUCE BRIEF HEAVY DOWNPOURS...SMALL HAIL AND
WIND GUSTS TO AROUND 40 MPH AS IT MOVES NORTHEAST ACROSS SOUTHEAST
OTOE COUNTY NEBRASKA AND INTO SOUTHERN FREMONT COUNTY IOWA...NEAR
THE TOWN OF HAMBURG BY 1145 PM CDT.

BYRD

Special weather statement, Jul 8, 11:54 PM CDT, 4 hours 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA NE
1150 PM CDT WED JUL 8 1987

AT 1150 PM CDT STRONG THUNDERSTORMS CONTINUED IN SOUTHEAST OTOE
...AND NORTHEAST NEMAHA COUNTIES OF SOUTHEAST NEBRASKA.  THESE
STORMS PRODUCED SMALL HAIL IN THE TOWN OF BROCK IN NEMAHA COUNTY
AROUND 11PM CDT.  THESE STORMS WERE MOVING SLOWLY NORTHEAST
AND WILL PRODUCE BRIEF HEAVY RAIN...SMALL HAIL AND STRONG GUSTY
WINDS AS THEY MOVE INTO SOUTHERN FREMONT COUNTY IOWA NEAR
HAMBURG.  SOME LOWLAND FLOODING IS ALSO POSSIBLE WITH THESE STORMS.

ANOTHER VERY INTENSE THUNDERSTOM HAD DEVELOPED OVER CENTRAL PAGE
COUNTY OF SOUTHWEST IOWA...5 MILES WEST OF CLARINDA.  THE STORM
WAS MOVING NORTHEAST AT 15 MP3H.

LISTEN FOR LATER STATEMENTS AND LOOK OUT FOR SMALL STREAM OR URBAN
FLOODING WITH THESE STORMS.

BYRD

Special weather statement, Jul 9, 1:03 AM CDT, 3 hours 23 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 9, 1:18 AM CDT, 3 hours 8 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 9, 3:20 AM CDT, 1 hour 6 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 1:32 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	58 min
Jul 9, 4:13 AM CDT	Severe Thunderstorm Warning	OAX	Seward	47 min
Jul 9, 2:46 PM CDT	Severe Thunderstorm Warning	OAX	Gage	89 min
Jul 9, 3:11 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Pawnee	34 min
Jul 9, 3:11 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster	49 min
Jul 9, 12:15 AM CDT	Tornado Warning	OAX	Page	30 min
Jul 9, 6:00 AM CDT	Flash Flood Warning	OAX	Page	4 hr

Nearby

Flash Flood Warnings in Iowa, 1987 Every flash flood warning in 1987

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.