Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 94, NWS Des Moines, IA

August 19, 1996Adams County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 19, 1996, 4:06 PM CDT for Adams County, Iowa. It was in force for 24 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
Aug 19, 1996, 4:06 PM CDT (21:06 UTC)
Expired
Aug 19, 1996, 4:30 PM CDT
In force
24 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Adams County, IA

The radar

The Des Moines radar (KDMX), 113 km from the middle of the area, began a volume at 21:06 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 19, 4:18 PM CDTThunderstorm Wind 50Corning, 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.1 hours before the alert went out and 144 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 12:00Z on 1996-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1345 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 1996-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
1345 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
826 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
60 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, Aug 19, 3:05 PM CDT, 1 hour 1 minute before
IAZ004>011-015>019-023>030-033>042-044>054-057>064-070>078-081>089-
092>099-191410-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
310 PM CDT MON AUG 19 1996

HAZARD...SCATTERED THUNDERSTORMS...SOME OF WHICH MAY PRODUCE HEAVY
RAIN.

AREA OF CONCERN...EAST OF LINE FROM ALGONA TO ATLANTIC.

TIMING DETAILS...LATE THIS AFTERNOON AND THIS EVENING.

METEOROLOGICAL COMMENTS...A COLD FRONT WHICH EXTENDED FROM NORTHWEST
MINNESOTA INTO EXTREME NORTHWEST IOWA THIS AFTERNOON WILL CONTINUE TO
MOVE EAST. MOIST AND UNSTABLE AIR WAS IN PLACE ACROSS IOWA THIS
AFTERNOON WITH DEW POINTS IN THE LOWER 70S AND SOUTHERLY WINDS AT 15
KTS...HOWEVER AFTERNOON HEATING HAS BEEN KEPT TO A MINIMUM DUE TO THE
THUNDERSTORMS WHICH HAVE EFFECTED MUCH OF THE STATE EARLIER TODAY.
WHILE THE AIRMASS IS UNSTABLE...THE GREATEST INSTABILITY IS IN PLACE
TO THE SOUTHWEST OF THE AREA. FREEZING LEVELS ARE ALSO OVER 14000
FEET...KEEPING LARGE HAIL THREATS LOW. IN ADDITION...UPPER LEVEL WINDS
ARE FAIRLY WEAK ACROSS THE AREA.

THUNDERSTORMS WILL LIKELY CONTINUE ACROSS THE AREA FOR THE REMAINDER
OF THE AFTERNOON HOURS AND INTO THIS EVENING ALONG AND AHEAD OF THE
COLD FRONT...HOWEVER STORMS AT THIS TIME ARE NOT EXPECTED TO BECOME
SEVERE...WITH ONLY BRIEF HEAVY RAINS EXPECTED. WITH A FAIRLY FAST
MOVEMENT OF THE STORMS AND RAIN REQUIREMENTS FOR FLOODING NEAR 4
INCHES...FLOODING IS NOT EXPECTED AT THIS TIME.

PRECAUTIONS...INTERESTED PARTIESd SHOULD KEEP ABREAST OF THE WEATHER
SITUATION...HOWEVER AT THIS TIME NO SEVERE WEATHER IS EXPECTED.

FORSTER/HUNTER

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 19, 4:33 PM CDTSevere Thunderstorm WarningDMXMarion27 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1996Every severe thunderstorm warning in 1996

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; radar from the NEXRAD Level II archive.