Alert archive / Iowa / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 19, NWS Quad Cities, IA

April 25, 2008Lee County, Iowa; Hancock County, Illinois; Clark County, Missouri

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 25, 2008, 2:54 PM CDT for Lee County, Iowa; Hancock County, Illinois; Clark County, Missouri. It was in force for 47 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: Apr 25, 2008, 2:54 PM CDT (19:54 UTC)
Expired: Apr 25, 2008, 3:41 PM CDT
In force: 47 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon

Counties Lee County, IA, Hancock County, IL, Clark County, MO

The radar

The Quad Cities radar (KDVN), 145 km from the middle of the area, began a volume at 19:57 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 25, 1:27 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jan 7, 1:52 PM CST	Tornado Watch	SPC	146 days

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.9 hours before the alert went out and 150 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: 1215 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.5

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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 25, 2:52 PM CDT, 2 minutes earlier.

Area forecast discussion, Apr 25, 2:52 PM CDT, 2 minutes before

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Hazardous weather outlook, Apr 25, 4:06 AM CDT, 10 hours 48 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
406 AM CDT FRI APR 25 2008

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-260915-
BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-
CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL-
WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON-
WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
406 AM CDT FRI APR 25 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...TODAY AND TONIGHT
A THUNDERSTORM COMPLEX WILL MOVE ACROSS THE AREA DURING THE MORNING
HOURS BRINGING LOCALLY HEAVY RAINFALL TO THE AREA. BOUNDARIES LEFT
OVER BY THIS THUNDERSTORM COMPLEX WILL ALLOW MORE THUNDERSTORMS TO
DEVELOP DURING THE AFTERNOON AND INTO THE EARLY EVENING HOURS.

SEVERE STORMS MAY BEEN SEEN TODAY AND EARLY THIS EVENING.
HOWEVER...IT WILL BE DEPENDENT UPON BOUNDARIES LEFT OVER FROM THE
MORNING THUNDERSTORMS AND THE AMOUNT OF DAY TIME HEATING. THERE IS A
VERY REAL POSSIBILITY THAT THE BEST CHANCES FOR ANY SEVERE STORMS
MAY LIE WITH THE ARRIVING THUNDERSTORM COMPLEX THIS MORNING. IF THIS
WOULD OCCUR...HAIL AND WIND WOULD BE THE PRIMARY THREAT.

THE HEAVY RAINFALL FROM THE STORMS MAY RESULT IN FLASH FLOODING.
SOILS ARE SATURATED SO ANY ADDITIONAL HEAVY RAINFALL WILL RUN OFF
RAPIDLY.

THE MISSISSIPPI RIVER AND MOST TRIBUTARY RIVERS IN EASTERN IOWA AND
NORTHWEST ILLINOIS WILL REMAIN ABOVE FLOOD STAGE. FLOOD WARNINGS
REMAIN IN EFFECT FOR POINTS IN THE WAPSIPINICON...CEDAR...IOWA...
ENGLISH...SKUNK...DES MOINES...AND MISSISSIPPI RIVER BASINS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY
A STORM SYSTEM PASSING SOUTH OF THE AREA WILL SPREAD RAIN OVER THE
REGION LATE SATURDAY NIGHT THROUGH SUNDAY. ISOLATED NON-SEVERE
THUNDERSTORMS WILL BE POSSIBLE ON SUNDAY. THERE ARE INDICATIONS
THAT TEMPERATURES MAY BE COLD ENOUGH TO SUPPORT A MIX OF RAIN AND
SNOW NORTH OF HIGHWAY 30 DURING THE DAY SUNDAY.

COLD AIR WILL REMAIN OVER THE AREA THROUGH MONDAY NIGHT CREATING A
THREAT OF FREEZING TEMPERATURES AND FROST. AT THIS TIME IT APPEARS
THAT TEMPERATURES MAY DROP TO OR JUST BELOW FREEZING SUNDAY NIGHT
NORTH OF HIGHWAY 30. MONDAY NIGHT...CONDITIONS WILL BE FAVORABLE
FOR FREEZING TEMPERATURES AND A WIDESPREAD FROST ALONG AND NORTH
OF INTERSTATE 80.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NECESSARY EARLY THIS MORNING AND AGAIN
LATE THIS AFTERNOON.

In the hours before

Local storm report, Apr 25, 2:13 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
213 PM CDT FRI APR 25 2008

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

0212 PM     HAIL             5 SE MANCHESTER         42.43N 91.39W
04/25/2008  M0.75 INCH       DELAWARE           IA   EMERGENCY MNGR

            VERY HEAVY RAIN AND STRONG GUSTY WINDS.

&&

STEVEK

Local storm report, Apr 25, 2:22 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
222 PM CDT FRI APR 25 2008

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

0220 PM     HAIL             DELHI                   42.43N 91.33W
04/25/2008  M1.75 INCH       DELAWARE           IA   EMERGENCY MNGR

            QUARTER TO GOLF BALL SIZE HAIL.

&&

MIKEZ

Local storm report, Apr 25, 2:29 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
229 PM CDT FRI APR 25 2008

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

0225 PM     HAIL             EARLVILLE               42.48N 91.27W
04/25/2008  M1.00 INCH       DELAWARE           IA   EMERGENCY MNGR

&&

Local storm report, Apr 25, 2:31 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
231 PM CDT FRI APR 25 2008

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

0231 PM     HAIL             COLESBURG               42.64N 91.20W
04/25/2008  E0.88 INCH       DELAWARE           IA   LAW ENFORCEMENT

&&

ERVIN

Local storm report, Apr 25, 2:42 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
242 PM CDT FRI APR 25 2008

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

0241 PM     HAIL             NEW VIENNA              42.55N 91.11W
04/25/2008  M1.50 INCH       DUBUQUE            IA   EMERGENCY MNGR

&&

MIKEZ

Local storm report, Apr 25, 2:44 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
244 PM CDT FRI APR 25 2008

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

0230 PM     HAIL             5 SW WASHINGTON         41.25N 91.76W
04/25/2008  M0.25 INCH       WASHINGTON         IA   TRAINED SPOTTER

            ALONG HIGHWAY 1 BETWEEN WASHINGTON AND BRIGHTON.

0237 PM     HAIL             3 W WASHINGTON          41.30N 91.75W
04/25/2008  M0.25 INCH       WASHINGTON         IA   TRAINED SPOTTER

&&

STEVEK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 8:40 PM CDT	River Flood Warning	DVN	Johnson, Washington	4 days
Apr 24, 8:40 PM CDT	River Flood Warning	DVN	Keokuk	5 days
Apr 24, 8:40 PM CDT	River Flood Warning	DVN	Des Moines, Henry, Lee	18 hr
Apr 24, 9:24 PM CDT	River Flood Warning	DVN	Dubuque, Jackson	6 days
Apr 24, 9:24 PM CDT	River Flood Warning	DVN	Dubuque, Jackson	11 days
Apr 24, 9:24 PM CDT	River Flood Warning	DVN	Clinton, Scott	11 days
Apr 24, 9:24 PM CDT	River Flood Warning	DVN	Muscatine, Scott	12 days
Apr 25, 5:01 AM CDT	River Flood Warning	DVN	Buchanan, Linn	4 days
Apr 25, 5:01 AM CDT	River Flood Warning	DVN	Delaware, Jones	34 hr
Apr 25, 5:01 AM CDT	River Flood Warning	DVN	Jackson	3 days
Apr 25, 5:56 AM CDT	Flash Flood Warning	DVN	Buchanan, Delaware, Dubuque	6 hr
Apr 25, 6:55 AM CDT	River Flood Warning	DVN	Benton, Linn	4 days
Apr 25, 6:55 AM CDT	River Flood Warning	DVN	Cedar, Johnson, Linn	6 days
Apr 25, 6:55 AM CDT	River Flood Warning	DVN	Johnson, Louisa, Washington	5 hr
Apr 25, 7:11 AM CDT	Flash Flood Warning	DVN	Benton, Iowa, Johnson, Keokuk, Linn	6 hr
Apr 25, 7:30 AM CDT	Severe Thunderstorm Warning	DVN	Jones	30 min
Apr 25, 7:47 AM CDT	Severe Thunderstorm Warning	DVN	Jackson	13 min
Apr 25, 7:51 AM CDT	Flash Flood Warning	DVN	Cedar, Dubuque, Jackson, Jones	6 hr
Apr 25, 12:02 PM CDT	River Flood Warning	DVN	Jackson	5 days
Apr 25, 1:42 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Dubuque, Linn	63 min
Apr 25, 2:26 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones, Linn	39 min
Apr 25, 2:31 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Henry, Johnson, Keokuk, Louisa, Muscatine and 1 more	59 min
Apr 25, 2:47 PM CDT	River Flood Warning	DVN	Johnson, Louisa, Washington	4 days
Apr 25, 2:51 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Louisa, Washington	39 min
Apr 25, 3:01 PM CDT	Tornado Warning	DVN	Cedar, Johnson, Louisa, Muscatine, Washington	44 min
Apr 25, 3:25 PM CDT	Tornado Warning	DVN	Louisa, Muscatine	65 min
Apr 25, 3:34 PM CDT	Tornado Warning	DVN	Cedar, Clinton, Muscatine, Scott	41 min
Apr 25, 3:41 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	64 min
Apr 25, 4:07 PM CDT	Tornado Warning	DVN	Clinton, Jackson	38 min
Apr 25, 4:19 PM CDT	Tornado Warning	DVN	Muscatine, Scott	41 min
Apr 25, 4:27 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	63 min
Apr 25, 5:36 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	24 min
Apr 24, 11:55 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess, Stephenson	35 min
Apr 25, 7:18 AM CDT	River Flood Warning	DVN	Stephenson	15 days
Apr 25, 8:56 AM CDT	Severe Thunderstorm Warning	DVN	Carroll	34 min
Apr 25, 5:16 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson	35 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2008 Severe Thunderstorm Warnings in Illinois, 2008 Severe Thunderstorm Warnings in Missouri, 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; radar from the NEXRAD Level II archive.