Alert archive / Iowa / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 172, NWS Des Moines, IA

June 3, 2006Humboldt County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 3, 2006, 7:34 PM CDT for Humboldt County, Iowa. It was in force for 23 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: Jun 3, 2006, 7:34 PM CDT (00:34 UTC)
Expired: Jun 3, 2006, 7:57 PM CDT
In force: 23 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Humboldt County, IA

The radar

The Des Moines radar (KDMX), 123 km from the middle of the area, began a volume at 00:37 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.6 hours before the alert went out and 241 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: 179 J/kg
Mixed-layer CIN: -172 J/kg
Mixed-layer LCL: 2202 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 3, 3:30 PM CDT, 4 hours 4 minutes earlier.

Area forecast discussion, Jun 3, 3:30 PM CDT, 4 hours 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
330 PM CDT SAT JUN 3 2006

.DISCUSSION...

THE FORECAST IS BECOMING MORE COMPLICATED AS THE UPPER RIDGE BREAKS
DOWN AND A QUASI STATIONARY SURFACE FRONT REMAINS STRETCHED ACROSS
IOWA.  CURRENT THINKING IS WITH DEWPOINTS IN THE 50S ACROSS THE
NORTHEAST AND A WEAK FRONT HANGING OVER CENTRAL IOWA...AFTERNOON
HEATING WILL POP SOME CU AND WE COULD SEE ISOLATED NON SEVERE STORMS
THIS AFTERNOON.  WE LOWERED HIGHS TODAY DUE TO THE EXPECTED INCREASE
IN AFTERNOON CLOUD COVER BUT ONLY A COUPLE DEGREES TO BETTER BLEND
WITH SURROUNDING OFFICES.  LASTLY...BUFR SOUNDINGS SURE INDICATE A
MENTION OF THUNDER WITH 3900 CAPE AND -10 LIS.  FOR TONIGHT...WE
SHOULD SEE WAA DEVELOP ACROSS THE CWA AND SOME THETA-E RIDGING
MOVING INTO THE CWA.  THIS WARRANTS CHC/SLGT CHC POPS ACROSS THE
SOUTHWEST AND WEST TONIGHT WITH STORMS DYING AFTER SUNRISE.  I LEFT
SLIGHT CHANCES SUNDAY  PRIMARILY DUE TO SUFFICIENT INSTABILITY TO
DEVELOP THUNDER IN THE AFTERNOON.

BEYOND TODAY... UA ANALYSIS SHOWING A SHORTWAVE COMING UP THE
BACKSIDE OF THE WESTERN U.S. RIDGE SHOULD AFFECT CENTRAL IOWA MONDAY
AFTERNOON AND NIGHT.  GIVEN THE AMOUNT OF FORCING AND COLD AIR
BROUGHT WITH THE SHORT WAVE...THE CAP SHOULD BREAK MONDAY AFTERNOON
THUS GIVING WAY TO SURFACE BASED DEVELOPMENT OF STORMS.  GFS IS
SHOWING THE BEST SHEAR AND CAPE IN QUITE A WHILE.  IT MAY BE ENOUGH
TO SUSTAIN UPDRAFTS LONG ENOUGH FOR HAIL AND WIND TO BE A
CONSIDERATION.  WILL MENTION THIS IN THE HWO.  THE SYSTEM PUSHES
EAST DURING THE TUESDAY MORNING PERIOD LEAVING THE REMAINDER OF
TUESDAY DRY...I THINK.  I HAVE REMOVED POPS FROM LATER TUESDAY BASED
ON THE QUICKER ONSET/MOVEMENT OF THE SYSTEM.  ANOTHER SHORTWAVE IS
SLATED FOR LATER IN THE WEEK...ABOUT A THURSDAY EVENING INTO FRIDAY
TIME FRAME.  I HAVE INTRODUCED THUNDER CHANCES FOR THIS TIME FRAME
AS A RESULT.  SURFACE LOW STRETCHES A WARM FRONT ACROSS KANSAS AND
MISSOURI AND OVER RUNNING AND THETA-E RIDGE DEVELOPS ACROSS THE WEST
LATE THURSDAY.  STORM INITIATION EXPECTED OVER THE WEST LATE IN THE
DAY THEN MOVE ACROSS THE CWA AT NIGHT.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

FAB

Hazardous weather outlook, Jun 3, 3:30 PM CDT, 4 hours 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 7:15 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2006 Every severe thunderstorm warning in 2006

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; radar from the NEXRAD Level II archive.