Alert archive / Nebraska / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 343, NWS Omaha, NE

July 7, 2008Cass County, Sarpy County, Nebraska; Mills County, Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 7, 2008, 5:24 PM CDT for Cass County, Sarpy County, Nebraska; Mills County, Pottawattamie County, Iowa. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 7, 2008, 5:24 PM CDT (22:24 UTC)
Expired: Jul 7, 2008, 6:15 PM CDT
In force: 51 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon

Counties Mills County, IA, Pottawattamie County, IA, Cass County, NE, Sarpy County, NE

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.4 hours before the alert went out and 50 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: 1217 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

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.

NWS Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 7, 3:12 PM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Jul 7, 3:12 PM CDT, 2 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
312 PM CDT MON JUL 7 2008

.UPDATE...
UPDATED TO INCLUDE FLASH FLOOD WATCH FOR PARTS OF SERN NE.

&&

.DISCUSSION...
STORMS SHOULD CONTINUE TO DEVELOP WITH STORMS LIKELY THROUGH
THE EVENING IN THE WATCH AREA.

&&

.PREV DISCUSSION... /ISSUED 219 PM CDT MON JUL 7 2008/

DISCUSSION...
THE POTENTIAL FOR CONVECTION OVER THE NEXT 24 HOURS IS THE PRIMARY
CONCERN. UPPER AIR CHARTS THIS MORNING SHOWED FAIRLY DECENT LOW
AND MID LEVEL MOISTURE IN PLACE FROM TX NWD/NEWD INTO THE CNTRL
PLAINS. PRECIPITABLE WATER VALUES WERE GENERALLY 100-150 PERCENT
OF NORMAL...SO IN ADDITION TO SEVERE STORMS...SOME WILL PRODUCE
VERY HEAVY RAIN. STORMS SHOULD TEND TO BE OR BECOME SOMEWHAT
OUTFLOW DOMINANT...SO WILL NOT ISSUE A FLASH FLOOD WATCH AT THIS
TIME. STORM CHANCES SHOULD TEND TO DECREASE IN OUR NORTHERN ZONES
AS THE NIGHT GOES ON...BUT LINGER IN THE SOUTH. WENT WITH LOWS IN
THE 60S MOST AREAS...WITH UPPER 60S AND LOWER 70S SOUTH.

SOME STORMS COULD LINGER IN THE SOUTH TUESDAY MORNING...AND THERE
IS A SLIGHT CHANCE JUST ABOUT EVERYWHERE TUESDAY AFTERNOON. MOST
HIGHS SHOULD BE AROUND 85 TO 90.

FETCH OF MOISTURE WHICH IS IN PLACE FROM THE SWRN U.S. IS EXPECTED
TO DECREASE BY MID WEEK. INCLUDED A SLIGHT CHANCE OF TSTMS TUESDAY
NIGHT AND WEDNESDAY NIGHT...BUT WENT DRY FROM THURSDAY INTO FRIDAY
NIGHT AS MID LEVEL HEIGHTS INCREASE. CHANCES SEEM BETTER BY THE
WEEKEND AS TROUGHING DEVELOPS OVER THE WRN U.S. AND A FRONT PUSHES
SOUTHEAST FROM THE NRN PLAINS. FRONT WILL BE DRIVEN BY A STRONG
CLOSED LOW AT 500 MB THAT WILL BE OVER BRITISH COLUMBIA WEDNESDAY
NIGHT...AND MOVE INTO ONTARIO ON SATURDAY. FRONT SHOULD STALL OUT
OVER OUR JUST SOUTH OF OUR AREA FOR THE WEEKEND. LEFT MONDAY DRY
FOR NOW...BUT THAT WILL LIKELY CHANGE WITH LATER FORECASTS. LOWS
SHOULD BE MAINLY IN THE 60S TO LOWER 70S...WITH HIGHS IN THE MID
80S TO MID 90S.

AVIATION...
FOR TAF SITES KOMA/KLNK/KOFK.

A COLD FRONT MOVING ACROSS THE AREA WILL AGAIN BRING CHANCE FOR
TSRA/SHRA AS WELL AS WIND SHIFTS THIS AFTN THROUGH TNGT.  GREATER
CHANCES FOR TSRA ARE AT KOMA/KLNK BETWEEN 21-00Z...WITH A LESSER CHC
AT KOFK.  FOR NOW...UNTIL TIMING/COVERAGE OF STORMS IS MORE
APPARENT...HAVE INCLUDED TEMPO SHRA/CB MENTION.  FRONT WILL MOVE
FROM KOFK THIS EVNG...THEN KOMA/KLNK OVERNIGHT...WITH LT/VARIABLE
WINDS FOR A GOOD PART OF THE NIGHT.  INCLUDED A TEMPO MENTION OF
MVFR VIS AT KOMA/KLNK TOWARD MRNG WITH LT WINDS AND RECENT MOISTURE.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR NEZ065-066-068-078-
     088>093.

IA...NONE.
&&

DISCUSSION...MILLER
AVIATION...MAYES

Hazardous weather outlook, Jul 7, 4:54 PM CDT, 30 minutes before

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In the hours before

Local storm report, Jul 7, 3:52 PM CDT, 1 hour 32 minutes before

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Local storm report, Jul 7, 4:12 PM CDT, 1 hour 12 minutes before

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Local storm report, Jul 7, 4:59 PM CDT, 25 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 7:20 PM CDT	River Flood Warning	OAX	Saline	28 hr
Jul 7, 3:09 PM CDT	Flash Flood Watch	OAX	Gage, Jefferson, Johnson, Lancaster, Nemaha, Otoe and 4 more	7 hr
Jul 7, 3:41 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	34 min
Jul 7, 4:49 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie, Shelby	26 min
Jul 7, 5:34 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery, Pottawattamie	41 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2008 Severe Thunderstorm Warnings in Iowa, 2008 Every severe thunderstorm warning in 2008

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.