Alert archive / Iowa / Flash Flood Watches in 2015

Flash Flood Watch 6, NWS Quad Cities, IA

July 28, 201515 counties in Iowa; 7 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flash flood watch at Jul 28, 2015, 3:24 PM CDT for 15 counties in Iowa; 7 counties in Illinois; Clark County, Scotland County, Missouri. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jul 28, 2015, 3:24 PM CDT (20:24 UTC)
Expired: Jul 29, 2015, 3:12 AM CDT
In force: 12 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

All 24 counties

Benton County, IA, Cedar County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Hancock County, IL, Henderson County, IL, Henry County, IL, McDonough County, IL, Mercer County, IL, Rock Island County, IL, Warren County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 80 km from the middle of the area, began a volume at 20:25 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

Davenport, (KDVN), launched 12:00Z, 8.4 hours before the alert went out and 86 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: 72 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 996 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 97 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 Quad Cities, IA wrote its last area forecast discussion before this flash flood watch went out at Jul 28, 6:38 AM CDT, 8 hours 46 minutes earlier.

Area forecast discussion, Jul 28, 6:38 AM CDT, 8 hours 46 minutes before

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Hazardous weather outlook, Jul 28, 4:23 AM CDT, 11 hours 1 minute before

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In the hours before

Local storm report, Jul 28, 11:30 AM CDT, 3 hours 54 minutes before

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Local storm report, Jul 28, 11:37 AM CDT, 3 hours 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1137 AM CDT TUE JUL 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1137 AM     HEAVY RAIN       S WILLIAMSBURG          41.66N 92.01W
07/28/2015  E1.00 INCH       IOWA               IA   TRAINED SPOTTER

            RAINFALL IN PAST 15 MINUTES

&&

TAS

Special weather statement, Jul 28, 11:46 AM CDT, 3 hours 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1146 AM CDT TUE JUL 28 2015

IAC031-045-097-105-281730-
JACKSON-CLINTON-JONES-CEDAR-
1146 AM CDT TUE JUL 28 2015

...LINE OF THUNDERSTORMS WITH STRONG GUSTY WINDS AND VERY HEAVY
RAIN...

AT 1145 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM LANGWORTHY TO NEAR MECHANICSVILLE...AND MOVING EAST AT
30 MPH.

WIND GUSTS UP TO 50 MPH ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
MAQUOKETA...STANWOOD...LOWDEN...WHEATLAND...OLIN...GRAND MOUND...
DELMAR...WYOMING...OXFORD JUNCTION...LOST NATION...CALAMUS...
ONSLOW...MONMOUTH...TORONTO...CENTER JUNCTION...NASHVILLE...
CLARENCE...BALDWIN...SCOTCH GROVE AND MAQUOKETA MUNICIPAL AIRPORT.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 4207 9060 4187 9062 4176 9065 4177 9067
      4175 9068 4176 9069 4174 9070 4174 9072
      4175 9075 4177 9077 4177 9081 4193 9124
      4206 9120 4220 9117
TIME...MOT...LOC 1645Z 287DEG 28KT 4217 9121 4194 9121

05

Local storm report, Jul 28, 12:25 PM CDT, 2 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1225 PM CDT TUE JUL 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1223 PM     HEAVY RAIN       N WELLMAN               41.47N 91.84W
07/28/2015  M1.80 INCH       WASHINGTON         IA   TRAINED SPOTTER

            RAINFALL TOTAL IN A 40 PERIOD THROUGH MIDDAY. NO FLOODING
            PROBLEMS.

&&

RP KINNEY

Local storm report, Jul 28, 12:34 PM CDT, 2 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1234 PM CDT TUE JUL 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1233 PM     HEAVY RAIN       2 NNE CEDAR RAPIDS      42.01N 91.65W
07/28/2015  M1.50 INCH       LINN               IA   TRAINED SPOTTER

            UPDATED TOTAL RAINFALL SO FAR.

&&

RP KINNEY

Local storm report, Jul 28, 1:11 PM CDT, 2 hours 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
111 PM CDT TUE JUL 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0110 PM     HEAVY RAIN       1 E INDEPENDENCE        42.47N 91.88W
07/28/2015  M1.70 INCH       BUCHANAN           IA   TRAINED SPOTTER

            UPDATED RAINFALL TOTAL SO FAR.

&&

RP KINNEY

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 9:13 PM CDT	Heat Advisory	DVN	Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more	22 hr
Jul 28, 8:23 AM CDT	River Flood Warning	DVN	Lee	5 days
Jul 28, 10:14 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Cedar, Delaware, Iowa, Johnson and 2 more	2 hr
Jul 28, 11:46 AM CDT	Special Weather Statement	DVN	Jones	44 min
Jul 28, 3:44 PM CDT	Special Weather Statement	DVN	Benton, Iowa	46 min
Jul 28, 4:45 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	30 min
Jul 28, 4:57 PM CDT	Special Weather Statement	DVN	Iowa	33 min
Jul 28, 6:02 PM CDT	Special Weather Statement	DVN	Keokuk, Washington	88 min
Jul 28, 6:39 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Washington	66 min
Jul 28, 4:05 PM CDT	River Flood Warning	DVN	Clark	65 hr

Nearby

Flash Flood Watches in Iowa, 2015 Flash Flood Watches in Illinois, 2015 Flash Flood Watches in Missouri, 2015 Every flash flood watch in 2015

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.