Alert archive / Iowa / Heat Advisories in 2007

Heat Advisory 2, NWS Quad Cities, IA

August 14, 20075 counties in Iowa; 4 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this heat advisory at Aug 14, 2007, 3:45 AM CDT for 5 counties in Iowa; 4 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Aug 14, 2007, 12:00 PM CDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Aug 14, 2007, 3:45 AM CDT (08:45 UTC)
In effect from
Aug 14, 2007, 12:00 PM CDT
Expired
Aug 14, 2007, 5:21 PM CDT
In force
5 hr
Issued by
NWS Quad Cities, IA

Counties Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Van Buren County, IA, Hancock County, IL, Henderson County, IL, McDonough County, IL, Warren County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 122 km from the middle of the area, began a volume at 08:44 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 00:00Z, 8.8 hours before the alert went out and 127 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2007-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 396 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2007-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
396 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1368 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Aug 14, 3:30 AM CDT, 15 minutes earlier.

Area forecast discussion, Aug 14, 3:30 AM CDT, 15 minutes before
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Hazardous weather outlook, Aug 13, 8:58 AM CDT, 18 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
858 AM CDT MON AUG 13 2007

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-141000-
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-
858 AM CDT MON AUG 13 2007

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...

TEMPERATURES IN THE LOW TO MID 90S AND INCREASING HUMIDITY TODAY
WILL COMBINE TO PRODUCE HEAT INDEX VALUES OF 100 TO 105 DEGREES
IN PORTIONS OF THE AREA SOUTH OF INTERSTATE 80. IF DEW POINTS CAN
INCREASE INTO THE MID AND UPPER 70S COMBINED WITH MID 90 DEGREE
TEMPERATURES...DANGEROUS HEAT INDEX READINGS OF 105 TO 109 MAY
OCCUR FOR A FEW HOURS THIS AFTERNOON.

A FEW HIGH BASED AND NON-SEVERE THUNDERSTORMS MAY MOVE OUT OF
CENTRAL IOWA AND AFFECT AREAS SOUTHWEST OF A LINE FROM
WILLIAMSBURG...TO MOUNT PLEASANT THROUGH MID MORNING. OF MORE
CONCERN WILL BE THE CHANCE FOR A COMPLEX OF STRONG TO SEVERE
THUNDERSTORMS TO DEVELOP THIS EVENING IN MINNESOTA AND THEN MOVE DOWN
ACROSS PORTIONS OF THE AREA OVERNIGHT. CURRENT INDICATIONS SUGGEST
AREAS ALONG AND NORTH OF HIGHWAY 30 IN NORTHEAST IOWA AND NORTHWEST
ILLINOIS WILL HAVE THE BEST CHANCE OF EXPERIENCING THESE STORMS AFTER
MIDNIGHT. DEPENDING ON WHERE THESE STORMS INITIALLY FORM...THE THREAT
COULD EXTEND DOWN TO OR EVEN JUST SOUTH OF THE INTERSTATE 80
CORRIDOR. IF THESE STORMS DO MANAGE TO GET DOWN INTO THE AREA...THE
PRIMARY THREAT WILL BE FROM DAMAGING STRAIGHT LINE WINDS OF 60 TO 70
MPH. THESE STORMS WILL ALSO HAVE THE POTENTIAL TO DUMP HEAVY AMOUNTS
OF RAINFALL IN A SMALL TIME. A FEW LOCATIONS THAT EXPERIENCE REPEATED
STORMS COULD RECEIVE 1 TO 2 INCHES OF RAINFALL BY TUESDAY MORNING...
WHICH MAY PRODUCE SOME URBAN AND SMALL STREAM FLOODING.

THE STORM PREDICTION CENTER HAS DUBUQUE AND DELAWARE COUNTIES IN
MODERATE RISK FOR TONIGHT...AND THE REMAINDER OF THE OUTLOOK AREA
DOWN TO THE HIGHWAY 34 CORRIDOR IN A SLIGHT RISK FOR SEVERE STORMS
TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THERE ARE THUNDERSTORM CHANCES EACH DAY TUESDAY THROUGH
THURSDAY...WITH A WARM FRONT DRAPED ACROSS NORTHERN MISSOURI OR
NORTHERN IOWA TO SERVE AS A FOCUS FOR THESE STORMS TO FORM ON.

THE STORM PREDICTION CENTER IS FORECASTING A SLIGHT RISK FOR SEVERE
STORMS ACROSS THE ENTIRE OUTLOOK AREA TUESDAY AND TUESDAY NIGHT.
TUESDAY AND TUESDAY NIGHT THESE STORMS HAVE THE POTENTIAL TO CAUSE
SEVERE WEATHER...WITH HIGH INSTABILITY IN OUR HOT HUMID AIRMASS.
THE GREATEST RISK WITH THESE STORMS IS LARGE HAIL AND DAMAGING
WINDS. ISOLATED SEVERE STORMS ARE ALSO POSSIBLE ON WEDNESDAY. IT
IS TOO EARLY TO DETERMINE THE POTENTIAL FOR SEVERE WEATHER OR
HEAVY RAINS ON THURSDAY.

FRIDAY NIGHT...SATURDAY AND SATURDAY NIGHT MORE THUNDERSTORMS ARE
EXPECTED TO MOVE THROUGH THE AREA. IT IS TOO EARLY TO DETERMINE
THE POTENTIAL FOR SEVERE WEATHER OR HEAVY RAINS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT...ESPECIALLY NORTH OF
INTERSTATE 80.

12/LE/ERVIN

In the hours before

Special weather statement, Aug 14, 3:22 AM CDT, 23 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 3:09 AM CDTSevere Thunderstorm WarningDVNDubuque, Jackson66 min

Nearby

Heat Advisories in Iowa, 2007Heat Advisories in Illinois, 2007Heat Advisories in Missouri, 2007Every heat advisory 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.