Alert archive / Iowa / Flood Watches in 2006

Flood Watch 2, NWS Des Moines, IA

April 6, 200627 counties in Iowa

NWS Des Moines, IA issued this flood watch at Apr 6, 2006, 4:12 AM CDT for 27 counties in Iowa. It took effect at Apr 6, 2006, 6:00 PM CDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Apr 6, 2006, 4:12 AM CDT (09:12 UTC)
In effect from: Apr 6, 2006, 6:00 PM CDT
Expired: Apr 7, 2006, 9:09 AM CDT
In force: 15 hr
Issued by: NWS Des Moines, IA
Flood severity: None

All 27 counties

Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Crawford County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 97 km from the middle of the area, began a volume at 09:15 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, 9.2 hours before the alert went out and 257 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: 298 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 1562 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 181 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 flood watch 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 flood watch went out at Apr 6, 3:48 AM CDT, 24 minutes earlier.

Area forecast discussion, Apr 6, 3:48 AM CDT, 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
348 AM CDT THU APR 6 2006

.DISCUSSION...
POTENTIAL STILL EXISTS FOR A SEVERE WEATHER OUTBREAK ACROSS PORTIONS
OF THE MIDWEST TODAY. CURRENT THUNDERSTORMS HAVE DEVELOPED ALONG A
THE THETA-E ADVECTION AXIS AND THUS FAR EVERY THING HAS REMAINED
BELOW SEVERE LIMITS. THE LATEST RUC AND NAM SOLUTIONS BOTH SUGGEST
ADDITIONAL DEVELOPMENT FARTHER TO THE WEST AS A PUNCH OF DRY 850 MB
AIR CURRENTLY MOVING INTO SOUTHEAST NEBRASKA REACHES SOUTHWEST IOWA
TOWARD 12Z. LOW PRESSURE IS CURRENTLY ACROSS CENTRAL NEBRASKA WITH
THE WARM FRONT EXTENDING INTO NORTHERN MISSOURI. MODELS CONTINUE TO
SHIFT THE SYSTEM FARTHER TO THE SOUTH AND A LITTLE SLOWER. LOOKS TO
BE TWO AREAS OF POTENTIAL CONVECTIVE INITIATION THIS AFTERNOON...ONE
OVER EASTERN NEBRASKA AND KANSAS ALONG THE DRY LINE AND APPROACHING
500 MB COLD POOL AND ANOTHER ALONG THE WARM FRONT OVER SOUTHWEST
IOWA PROVIDED TEMPERATURES CAN PUSH INTO THE MID 70S THIS AFTERNOON.
SHEAR PROFILES STILL FAVORABLE FOR SUPERCELLS THIS AFTERNOON AND
EARLY EVENING BEFORE BECOMING MORE LINEAR THIS EVENING AS THE
ACTIVITY LIFTS TO THE NORTHEAST WITH THE SEVERE THREAT GRADUALLY
DIMINISHING TOWARD MIDNIGHT. CAP WILL WEAKEN BY MID TO LATE
AFTERNOON ACROSS WEST CENTRAL AND SOUTHWEST IOWA AS THE COOLER MID
LEVEL TEMPERATURES MOVE IN AND COULD LEAD TO RAPID THUNDERSTORM
DEVELOPMENT. AREA REMAINS IN A MODERATE RISK WITH INITIAL THREATS
BEING LARGE HAIL AND TORNADOES EARLY THEN TRANSITIONING TO A HAIL
AND WIND THREAT IN THE EVENING. REFER TO SWODY1 FOR ADDITIONAL
INFORMATION.

WILL ISSUE A FLOOD WATCH FOR ALONG AND NORTH OF HIGHWAY 30 FOR
TONIGHT THROUGH NOON FRIDAY. THUNDERSTORMS WILL LIFT INTO THE AREA
THIS EVENING THEN WILL LINGER THROUGHOUT THE NIGHT AS THE AXIS OF
PRECIPITATION PIVOTS OVER THE REGION. GOOD OVERRUNNING EVENT STILL
LOOKS LIKELY. GOOD WARM CLOUD DEPTHS ALONG WITH PRECIPITAL WATERS
OVER 200 PERCENT OF NORMAL WILL LEAD TO RAINFALL AMOUNTS OF 1 TO 2
INCHES WITH LOCALLY HIGHER AMOUNTS. WITH RIVERS AND STREAMS STILL
RUNNING NEAR OR AT BANKFULL OVER THE REGION...HEAVY RAINFALL WILL
AGGRAVATE THE SITUATION. A DEFORMATION RAIN BAND WILL LINGER ACROSS
THE NORTH ON FRIDAY MORNING BEFORE A SURGE OF DRY CANADIAN AIR MOVES
IN FROM THE NORTH AND WILL MOVE THE PRECIPITATION TO THE SOUTH. HAVE
CONTINUED THE TREND OF STEADY OR FALLING TEMPERATURES THROUGHOUT THE
DAY. HIGH PRESSURE SETTLES OVERHEAD FOR THE WEEKEND WITH
TEMPERATURES GRADUALLY WARMING BACK TO SEASONAL VALUES.

NO CHANGES TO THE EXTENDED AT THIS TIME.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...

FLOOD WATCH ALONG AND NORTH OF HIGHWAY 30 TONIGHT THROUGH FRIDAY
MORNING.

&&

DONAVON

Hazardous weather outlook, Apr 5, 3:43 PM CDT, 12 hours 29 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
Apr 6, 7:09 AM CDT	Severe Thunderstorm Warning	DMX	Marshall, Tama	25 min
Apr 6, 10:05 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis	22 min
Apr 6, 10:27 AM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	22 min
Apr 6, 10:48 AM CDT	Severe Thunderstorm Warning	DMX	Davis	12 min
Apr 6, 3:53 PM CDT	Wind Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more	24 hr

Nearby

Flood Watches in Iowa, 2006 Every flood watch 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.