Alert archive / Iowa / Flash Flood Watches in 2007

Flash Flood Watch 5, NWS Des Moines, IA

May 31, 200724 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at May 31, 2007, 3:32 PM CDT for 24 counties in Iowa. It took effect at Jun 1, 2007, 3:36 AM CDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: May 31, 2007, 3:32 PM CDT (20:32 UTC)
In effect from: Jun 1, 2007, 3:36 AM CDT
Expired: Jun 2, 2007, 4:00 AM CDT
In force: 24 hr
Issued by: NWS Des Moines, IA
Flood severity: None

All 24 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 58 km from the middle of the area, began a volume at 20:32 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 12:00Z, 8.5 hours before the alert went out and 245 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: 1305 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash 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 flash flood watch went out at May 31, 3:24 PM CDT, 8 minutes earlier.

Area forecast discussion, May 31, 3:24 PM CDT, 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
324 PM CDT THU MAY 31 2007

.DISCUSSION...
AS THE FIRST CDFNT THAT DISPTD AS IT MOVED ACRS THE CWA LAST NGT
MOVS OUT OF THE PIX...THE NEXT FNTL BNDRY IS DVLPG AS LO
INTENSIFIES OVR NWRN SD. STG THETA-E ADVN WL MOVE INTO THE CWA
LATE TNGT INTO FRI WITH A DECENT MCS DVLPG. FEEL PCPN WL MOVE INTO
SWRN PART OF THE CWA BY 12Z AND SPRD EWD DURG THE DAY. SIMILAR
AMOUNTS OF PCPN AS WE SAY WITH SYS YDA. SYS WL MOV TO THE E FRI
NGT AND MUCH OF THE SIG PCPN FOR THIS FCST PD WL BE OVER WITH AS
UPR LOW DROPS SE. NWLY FLOW AFT THAT INTO NEXT WK, BUT NOT ALL
THAT STABLE WITH THE UPPER LOW NOT REALLY MOVING ALL THAT FAR.
HAVE PUT IN SOME INTMT PDS OF TSRA, BUT WDSPRD ORGANIZED EVENTS DO
NOT APPEAR LKLY.

&&

AVIATION 31/18Z...
SOME CU WILL CONTINUE TO DEVELOP THIS AFTERNOON...ESPECIALLY WEST.
SOME ISOLD -TSRA COULD IMPACT FOD BY LATE AFTERNOON BUT WITH
UNCERTAINTY WILL LEAVE OUT OF INITIAL TAF. THUNDERSTORMS SHOULD
SPREAD NORTH INTO IA AFTER 12Z FRIDAY AND HAVE INCLUDED MENTION IN
FOD/DSM/OTM FOR NOW.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH FROM FRIDAY AFTERNOON THROUGH LATE FRIDAY
NIGHT FOR ADAIR-ADAMS-CLARKE-DALLAS-DECATUR-JASPER-LUCAS-MADISON-
MARION-MARSHALL-POLK-RINGGOLD-STORY-TAYLOR-UNION-WARREN-WAYNE.

&&

Hazardous weather outlook, May 31, 5:25 AM CDT, 10 hours 7 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
May 31, 5:43 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	47 min

Nearby

Flash Flood Watches in Iowa, 2007 Every flash flood watch in 2007

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.